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b0278d39 | 1 | /* The lang_hooks data structure. |
20325f61 | 2 | Copyright 2001, 2002 Free Software Foundation, Inc. |
e8602e56 | 3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
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 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
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 | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
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 *, | |
51 | void *)); | |
52 | int (*anon_aggr_type_p) PARAMS ((union tree_node *)); | |
054e01a7 | 53 | int (*start_inlining) PARAMS ((union tree_node *)); |
54 | void (*end_inlining) PARAMS ((union tree_node *)); | |
78b80426 | 55 | union tree_node *(*convert_parm_for_inlining) PARAMS ((union tree_node *, |
56 | union tree_node *, | |
57 | union tree_node *)); | |
b0278d39 | 58 | }; |
59 | ||
3119c950 | 60 | /* The following hooks are used by tree-dump.c. */ |
61 | ||
62 | struct lang_hooks_for_tree_dump | |
63 | { | |
64 | /* Dump language-specific parts of tree nodes. Returns non-zero if it | |
65 | does not want the usual dumping of the second argument. */ | |
66 | int (*dump_tree) PARAMS ((void *, tree)); | |
67 | ||
68 | /* Determine type qualifiers in a language-specific way. */ | |
69 | int (*type_quals) PARAMS ((tree)); | |
70 | }; | |
71 | ||
a1f71e15 | 72 | /* Hooks related to types. */ |
73 | ||
74 | struct lang_hooks_for_types | |
75 | { | |
771d21fa | 76 | /* Return a new type (with the indicated CODE), doing whatever |
77 | language-specific processing is required. */ | |
a1f71e15 | 78 | tree (*make_type) PARAMS ((enum tree_code)); |
771d21fa | 79 | |
80 | /* Given MODE and UNSIGNEDP, return a suitable type-tree with that | |
81 | mode. */ | |
82 | tree (*type_for_mode) PARAMS ((enum machine_mode, int)); | |
83 | ||
84 | /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an | |
85 | integer type with at least that precision. */ | |
86 | tree (*type_for_size) PARAMS ((unsigned, int)); | |
4070745f | 87 | |
88 | /* Given an integer type T, return a type like T but unsigned. | |
89 | If T is unsigned, the value is T. */ | |
90 | tree (*unsigned_type) PARAMS ((tree)); | |
91 | ||
92 | /* Given an integer type T, return a type like T but signed. | |
93 | If T is signed, the value is T. */ | |
94 | tree (*signed_type) PARAMS ((tree)); | |
95 | ||
96 | /* Return a type the same as TYPE except unsigned or signed | |
97 | according to UNSIGNEDP. */ | |
98 | tree (*signed_or_unsigned_type) PARAMS ((int, tree)); | |
1dd25100 | 99 | |
63c62881 | 100 | /* Given a type, apply default promotions to unnamed function |
101 | arguments and return the new type. Return the same type if no | |
102 | change. Required by any language that supports variadic | |
103 | arguments. The default hook aborts. */ | |
104 | tree (*type_promotes_to) PARAMS ((tree)); | |
105 | ||
1dd25100 | 106 | /* This routine is called in tree.c to print an error message for |
107 | invalid use of an incomplete type. VALUE is the expression that | |
108 | was used (or 0 if that isn't known) and TYPE is the type that was | |
109 | invalid. */ | |
110 | void (*incomplete_type_error) PARAMS ((tree value, tree type)); | |
a1f71e15 | 111 | }; |
112 | ||
20325f61 | 113 | /* Language hooks related to decls and the symbol table. */ |
114 | ||
115 | struct lang_hooks_for_decls | |
116 | { | |
117 | /* Enter a new lexical scope. Argument is always zero when called | |
118 | from outside the front end. */ | |
119 | void (*pushlevel) PARAMS ((int)); | |
120 | ||
121 | /* Exit a lexical scope and return a BINDING for that scope. | |
122 | Takes three arguments: | |
123 | KEEP -- nonzero if there were declarations in this scope. | |
124 | REVERSE -- reverse the order of decls before returning them. | |
125 | FUNCTIONBODY -- nonzero if this level is the body of a function. */ | |
126 | tree (*poplevel) PARAMS ((int, int, int)); | |
127 | ||
128 | /* Returns non-zero if we are in the global binding level. Ada | |
129 | returns -1 for an undocumented reason used in stor-layout.c. */ | |
130 | int (*global_bindings_p) PARAMS ((void)); | |
131 | ||
132 | /* Insert BLOCK at the end of the list of subblocks of the | |
133 | current binding level. This is used when a BIND_EXPR is expanded, | |
134 | to handle the BLOCK node inside the BIND_EXPR. */ | |
135 | void (*insert_block) PARAMS ((tree)); | |
136 | ||
137 | /* Set the BLOCK node for the current scope level. */ | |
138 | void (*set_block) PARAMS ((tree)); | |
139 | ||
140 | /* Function to add a decl to the current scope level. Takes one | |
141 | argument, a decl to add. Returns that decl, or, if the same | |
142 | symbol is already declared, may return a different decl for that | |
143 | name. */ | |
144 | tree (*pushdecl) PARAMS ((tree)); | |
145 | ||
146 | /* Returns the chain of decls so far in the current scope level. */ | |
147 | tree (*getdecls) PARAMS ((void)); | |
8d58a5a7 | 148 | |
149 | /* Returns true when we should warn for an unused global DECL. | |
150 | We will already have checked that it has static binding. */ | |
151 | bool (*warn_unused_global) PARAMS ((tree)); | |
20325f61 | 152 | }; |
153 | ||
b0278d39 | 154 | /* Language-specific hooks. See langhooks-def.h for defaults. */ |
155 | ||
156 | struct lang_hooks | |
157 | { | |
d19bd1f0 | 158 | /* String identifying the front end. e.g. "GNU C++". */ |
159 | const char *name; | |
160 | ||
161 | /* sizeof (struct lang_identifier), so make_node () creates | |
162 | identifier nodes long enough for the language-specific slots. */ | |
163 | size_t identifier_size; | |
164 | ||
435fb09b | 165 | /* The first callback made to the front end, for simple |
166 | initialization needed before any calls to decode_option. */ | |
b0278d39 | 167 | void (*init_options) PARAMS ((void)); |
168 | ||
169 | /* Function called with an option vector as argument, to decode a | |
170 | single option (typically starting with -f or -W or +). It should | |
171 | return the number of command-line arguments it uses if it handles | |
172 | the option, or 0 and not complain if it does not recognise the | |
173 | option. If this function returns a negative number, then its | |
174 | absolute value is the number of command-line arguments used, but, | |
175 | in addition, no language-independent option processing should be | |
176 | done for this option. */ | |
177 | int (*decode_option) PARAMS ((int, char **)); | |
178 | ||
435fb09b | 179 | /* Called when all command line options have been parsed. Should do |
180 | any required consistency checks, modifications etc. Complex | |
181 | initialization should be left to the "init" callback, since GC | |
182 | and the identifier hashes are set up between now and then. */ | |
b0278d39 | 183 | void (*post_options) PARAMS ((void)); |
184 | ||
435fb09b | 185 | /* Called after post_options, to initialize the front end. The main |
186 | input filename is passed, which may be NULL; the front end should | |
187 | return the original filename (e.g. foo.i -> foo.c). Return NULL | |
188 | to indicate a serious error of some sort; in that case no | |
189 | compilation is performed, and the finish hook is called | |
190 | immediately. */ | |
191 | const char * (*init) PARAMS ((const char *)); | |
192 | ||
193 | /* Called at the end of compilation, as a finalizer. */ | |
194 | void (*finish) PARAMS ((void)); | |
195 | ||
b78207a0 | 196 | /* Parses the entire file. */ |
197 | void (*parse_file) PARAMS ((void)); | |
198 | ||
435fb09b | 199 | /* Called immediately after parsing to clear the binding stack. */ |
200 | void (*clear_binding_stack) PARAMS ((void)); | |
201 | ||
b0278d39 | 202 | /* Called to obtain the alias set to be used for an expression or type. |
203 | Returns -1 if the language does nothing special for it. */ | |
204 | HOST_WIDE_INT (*get_alias_set) PARAMS ((tree)); | |
205 | ||
b3187c7c | 206 | /* Called with an expression that is to be processed as a constant. |
207 | Returns either the same expression or a language-independent | |
208 | constant equivalent to its input. */ | |
209 | tree (*expand_constant) PARAMS ((tree)); | |
210 | ||
b467ecc1 | 211 | /* Called by expand_expr for language-specific tree codes. |
212 | Fourth argument is actually an enum expand_modifier. */ | |
213 | rtx (*expand_expr) PARAMS ((tree, rtx, enum machine_mode, int)); | |
214 | ||
aff9e656 | 215 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical |
216 | operation. | |
217 | ||
218 | This preparation consists of taking the ordinary representation | |
219 | of an expression expr and producing a valid tree boolean | |
220 | expression describing whether expr is nonzero. We could simply | |
221 | always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1), | |
222 | but we optimize comparisons, &&, ||, and !. | |
223 | ||
224 | The result should be an expression of boolean type (if not an | |
225 | error_mark_node). */ | |
226 | tree (*truthvalue_conversion) PARAMS ((tree)); | |
227 | ||
26ca6c20 | 228 | /* Possibly apply default attributes to a function (represented by |
229 | a FUNCTION_DECL). */ | |
230 | void (*insert_default_attributes) PARAMS ((tree)); | |
231 | ||
b3187c7c | 232 | /* Hook called by safe_from_p for language-specific tree codes. It is |
233 | up to the language front-end to install a hook if it has any such | |
234 | codes that safe_from_p needs to know about. Since same_from_p will | |
235 | recursively explore the TREE_OPERANDs of an expression, this hook | |
236 | should not reexamine those pieces. This routine may recursively | |
237 | call safe_from_p; it should always pass `0' as the TOP_P | |
238 | parameter. */ | |
239 | int (*safe_from_p) PARAMS ((rtx, tree)); | |
240 | ||
ee23fd7b | 241 | /* Function to finish handling an incomplete decl at the end of |
242 | compilation. Default hook is does nothing. */ | |
243 | void (*finish_incomplete_decl) PARAMS ((tree)); | |
244 | ||
245 | /* Function used by unsafe_for_reeval. A non-negative number is | |
246 | returned directly from unsafe_for_reeval, a negative number falls | |
247 | through. The default hook returns a negative number. */ | |
248 | int (*unsafe_for_reeval) PARAMS ((tree)); | |
249 | ||
9b86eec0 | 250 | /* Mark EXP saying that we need to be able to take the address of |
251 | it; it should not be allocated in a register. Return true if | |
252 | successful. */ | |
253 | bool (*mark_addressable) PARAMS ((tree)); | |
254 | ||
f1833f1b | 255 | /* Hook called by staticp for language-specific tree codes. */ |
256 | int (*staticp) PARAMS ((tree)); | |
257 | ||
dbc42b78 | 258 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the |
259 | DECL_NODE with a newly GC-allocated copy. */ | |
260 | void (*dup_lang_specific_decl) PARAMS ((tree)); | |
261 | ||
1d347c23 | 262 | /* Called before its argument, an UNSAVE_EXPR, is to be |
263 | unsaved. Modify it in-place so that all the evaluate only once | |
264 | things are cleared out. */ | |
265 | tree (*unsave_expr_now) PARAMS ((tree)); | |
266 | ||
04745efb | 267 | /* Called by expand_expr to build and return the cleanup-expression |
268 | for the passed TARGET_EXPR. Return NULL if there is none. */ | |
269 | tree (*maybe_build_cleanup) PARAMS ((tree)); | |
270 | ||
6d26a3ee | 271 | /* Mark nodes held through the lang_specific hooks in the tree. */ |
272 | void (*mark_tree) PARAMS ((tree)); | |
273 | ||
d1f6c8f2 | 274 | /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of |
275 | thing that the assembler should talk about, set | |
276 | DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE. | |
277 | Otherwise, set it to the ERROR_MARK_NODE to ensure that the | |
278 | assembler does not talk about it. */ | |
279 | void (*set_decl_assembler_name) PARAMS ((tree)); | |
280 | ||
b0278d39 | 281 | /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */ |
282 | bool honor_readonly; | |
283 | ||
b7fced5e | 284 | /* The front end can add its own statistics to -fmem-report with |
285 | this hook. It should output to stderr. */ | |
286 | void (*print_statistics) PARAMS ((void)); | |
287 | ||
288 | /* Called by print_tree when there is a tree of class 'x' that it | |
289 | doesn't know how to display. */ | |
290 | lang_print_tree_hook print_xnode; | |
291 | ||
292 | /* Called to print language-dependent parts of a class 'd', class | |
293 | 't', and IDENTIFIER_NODE nodes. */ | |
294 | lang_print_tree_hook print_decl; | |
295 | lang_print_tree_hook print_type; | |
296 | lang_print_tree_hook print_identifier; | |
297 | ||
96554925 | 298 | /* Computes the name to use to print a declaration. DECL is the |
299 | non-NULL declaration in question. VERBOSITY determines what | |
300 | information will be printed: 0: DECL_NAME, demangled as | |
301 | necessary. 1: and scope information. 2: and any other | |
302 | information that might be interesting, such as function parameter | |
303 | types in C++. */ | |
304 | const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity)); | |
305 | ||
6c7ff025 | 306 | /* Called by report_error_function to print out function name. */ |
307 | void (*print_error_function) PARAMS ((struct diagnostic_context *, | |
308 | const char *)); | |
309 | ||
b7fced5e | 310 | /* Set yydebug for bison-based parsers, when -dy is given on the |
311 | command line. By default, if the parameter is non-zero, prints a | |
312 | warning that the front end does not use such a parser. */ | |
313 | void (*set_yydebug) PARAMS ((int)); | |
314 | ||
b0278d39 | 315 | struct lang_hooks_for_tree_inlining tree_inlining; |
3119c950 | 316 | |
317 | struct lang_hooks_for_tree_dump tree_dump; | |
b0278d39 | 318 | |
20325f61 | 319 | struct lang_hooks_for_decls decls; |
320 | ||
a1f71e15 | 321 | struct lang_hooks_for_types types; |
322 | ||
3119c950 | 323 | /* Whenever you add entries here, make sure you adjust langhooks-def.h |
b0278d39 | 324 | and langhooks.c accordingly. */ |
325 | }; | |
326 | ||
327 | /* Each front end provides its own. */ | |
d19bd1f0 | 328 | extern const struct lang_hooks lang_hooks; |
e8602e56 | 329 | |
330 | #endif /* GCC_LANG_HOOKS_H */ |