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1 | /* The lang_hooks data structure. | |
2 | Copyright 2001, 2002 Free Software Foundation, Inc. | |
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 | ||
24 | /* A print hook for print_tree (). */ | |
25 | typedef void (*lang_print_tree_hook) PARAMS ((FILE *, tree, int indent)); | |
26 | ||
27 | /* The following hooks are documented in langhooks.c. Must not be | |
28 | NULL. */ | |
29 | ||
30 | struct lang_hooks_for_tree_inlining | |
31 | { | |
32 | union tree_node *(*walk_subtrees) PARAMS ((union tree_node **, int *, | |
33 | union tree_node *(*) | |
34 | (union tree_node **, | |
35 | int *, void *), | |
36 | void *, void *)); | |
37 | int (*cannot_inline_tree_fn) PARAMS ((union tree_node **)); | |
38 | int (*disregard_inline_limits) PARAMS ((union tree_node *)); | |
39 | union tree_node *(*add_pending_fn_decls) PARAMS ((void *, | |
40 | union tree_node *)); | |
41 | int (*tree_chain_matters_p) PARAMS ((union tree_node *)); | |
42 | int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *)); | |
43 | union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *, | |
44 | union tree_node *, | |
45 | union tree_node *, | |
46 | void *, int *, | |
47 | void *)); | |
48 | int (*anon_aggr_type_p) PARAMS ((union tree_node *)); | |
49 | int (*start_inlining) PARAMS ((union tree_node *)); | |
50 | void (*end_inlining) PARAMS ((union tree_node *)); | |
51 | union tree_node *(*convert_parm_for_inlining) PARAMS ((union tree_node *, | |
52 | union tree_node *, | |
53 | union tree_node *)); | |
54 | }; | |
55 | ||
56 | /* The following hooks are used by tree-dump.c. */ | |
57 | ||
58 | struct lang_hooks_for_tree_dump | |
59 | { | |
60 | /* Dump language-specific parts of tree nodes. Returns non-zero if it | |
61 | does not want the usual dumping of the second argument. */ | |
62 | int (*dump_tree) PARAMS ((void *, tree)); | |
63 | ||
64 | /* Determine type qualifiers in a language-specific way. */ | |
65 | int (*type_quals) PARAMS ((tree)); | |
66 | }; | |
67 | ||
68 | /* Language hooks related to decls and the symbol table. */ | |
69 | ||
70 | struct lang_hooks_for_decls | |
71 | { | |
72 | /* Enter a new lexical scope. Argument is always zero when called | |
73 | from outside the front end. */ | |
74 | void (*pushlevel) PARAMS ((int)); | |
75 | ||
76 | /* Exit a lexical scope and return a BINDING for that scope. | |
77 | Takes three arguments: | |
78 | KEEP -- nonzero if there were declarations in this scope. | |
79 | REVERSE -- reverse the order of decls before returning them. | |
80 | FUNCTIONBODY -- nonzero if this level is the body of a function. */ | |
81 | tree (*poplevel) PARAMS ((int, int, int)); | |
82 | ||
83 | /* Returns non-zero if we are in the global binding level. Ada | |
84 | returns -1 for an undocumented reason used in stor-layout.c. */ | |
85 | int (*global_bindings_p) PARAMS ((void)); | |
86 | ||
87 | /* Insert BLOCK at the end of the list of subblocks of the | |
88 | current binding level. This is used when a BIND_EXPR is expanded, | |
89 | to handle the BLOCK node inside the BIND_EXPR. */ | |
90 | void (*insert_block) PARAMS ((tree)); | |
91 | ||
92 | /* Set the BLOCK node for the current scope level. */ | |
93 | void (*set_block) PARAMS ((tree)); | |
94 | ||
95 | /* Function to add a decl to the current scope level. Takes one | |
96 | argument, a decl to add. Returns that decl, or, if the same | |
97 | symbol is already declared, may return a different decl for that | |
98 | name. */ | |
99 | tree (*pushdecl) PARAMS ((tree)); | |
100 | ||
101 | /* Returns the chain of decls so far in the current scope level. */ | |
102 | tree (*getdecls) PARAMS ((void)); | |
103 | }; | |
104 | ||
105 | /* Language-specific hooks. See langhooks-def.h for defaults. */ | |
106 | ||
107 | struct lang_hooks | |
108 | { | |
109 | /* String identifying the front end. e.g. "GNU C++". */ | |
110 | const char *name; | |
111 | ||
112 | /* sizeof (struct lang_identifier), so make_node () creates | |
113 | identifier nodes long enough for the language-specific slots. */ | |
114 | size_t identifier_size; | |
115 | ||
116 | /* The first callback made to the front end, for simple | |
117 | initialization needed before any calls to decode_option. */ | |
118 | void (*init_options) PARAMS ((void)); | |
119 | ||
120 | /* Function called with an option vector as argument, to decode a | |
121 | single option (typically starting with -f or -W or +). It should | |
122 | return the number of command-line arguments it uses if it handles | |
123 | the option, or 0 and not complain if it does not recognise the | |
124 | option. If this function returns a negative number, then its | |
125 | absolute value is the number of command-line arguments used, but, | |
126 | in addition, no language-independent option processing should be | |
127 | done for this option. */ | |
128 | int (*decode_option) PARAMS ((int, char **)); | |
129 | ||
130 | /* Called when all command line options have been parsed. Should do | |
131 | any required consistency checks, modifications etc. Complex | |
132 | initialization should be left to the "init" callback, since GC | |
133 | and the identifier hashes are set up between now and then. */ | |
134 | void (*post_options) PARAMS ((void)); | |
135 | ||
136 | /* Called after post_options, to initialize the front end. The main | |
137 | input filename is passed, which may be NULL; the front end should | |
138 | return the original filename (e.g. foo.i -> foo.c). Return NULL | |
139 | to indicate a serious error of some sort; in that case no | |
140 | compilation is performed, and the finish hook is called | |
141 | immediately. */ | |
142 | const char * (*init) PARAMS ((const char *)); | |
143 | ||
144 | /* Called at the end of compilation, as a finalizer. */ | |
145 | void (*finish) PARAMS ((void)); | |
146 | ||
147 | /* Parses the entire file. */ | |
148 | void (*parse_file) PARAMS ((void)); | |
149 | ||
150 | /* Called immediately after parsing to clear the binding stack. */ | |
151 | void (*clear_binding_stack) PARAMS ((void)); | |
152 | ||
153 | /* Called to obtain the alias set to be used for an expression or type. | |
154 | Returns -1 if the language does nothing special for it. */ | |
155 | HOST_WIDE_INT (*get_alias_set) PARAMS ((tree)); | |
156 | ||
157 | /* Called with an expression that is to be processed as a constant. | |
158 | Returns either the same expression or a language-independent | |
159 | constant equivalent to its input. */ | |
160 | tree (*expand_constant) PARAMS ((tree)); | |
161 | ||
162 | /* Hook called by safe_from_p for language-specific tree codes. It is | |
163 | up to the language front-end to install a hook if it has any such | |
164 | codes that safe_from_p needs to know about. Since same_from_p will | |
165 | recursively explore the TREE_OPERANDs of an expression, this hook | |
166 | should not reexamine those pieces. This routine may recursively | |
167 | call safe_from_p; it should always pass `0' as the TOP_P | |
168 | parameter. */ | |
169 | int (*safe_from_p) PARAMS ((rtx, tree)); | |
170 | ||
171 | /* Hook called by staticp for language-specific tree codes. */ | |
172 | int (*staticp) PARAMS ((tree)); | |
173 | ||
174 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the | |
175 | DECL_NODE with a newly GC-allocated copy. */ | |
176 | void (*dup_lang_specific_decl) PARAMS ((tree)); | |
177 | ||
178 | /* Called before its argument, an UNSAVE_EXPR, is to be | |
179 | unsaved. Modify it in-place so that all the evaluate only once | |
180 | things are cleared out. */ | |
181 | tree (*unsave_expr_now) PARAMS ((tree)); | |
182 | ||
183 | /* Called by expand_expr to build and return the cleanup-expression | |
184 | for the passed TARGET_EXPR. Return NULL if there is none. */ | |
185 | tree (*maybe_build_cleanup) PARAMS ((tree)); | |
186 | ||
187 | /* Mark nodes held through the lang_specific hooks in the tree. */ | |
188 | void (*mark_tree) PARAMS ((tree)); | |
189 | ||
190 | /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */ | |
191 | bool honor_readonly; | |
192 | ||
193 | /* The front end can add its own statistics to -fmem-report with | |
194 | this hook. It should output to stderr. */ | |
195 | void (*print_statistics) PARAMS ((void)); | |
196 | ||
197 | /* Called by print_tree when there is a tree of class 'x' that it | |
198 | doesn't know how to display. */ | |
199 | lang_print_tree_hook print_xnode; | |
200 | ||
201 | /* Called to print language-dependent parts of a class 'd', class | |
202 | 't', and IDENTIFIER_NODE nodes. */ | |
203 | lang_print_tree_hook print_decl; | |
204 | lang_print_tree_hook print_type; | |
205 | lang_print_tree_hook print_identifier; | |
206 | ||
207 | /* Computes the name to use to print a declaration. DECL is the | |
208 | non-NULL declaration in question. VERBOSITY determines what | |
209 | information will be printed: 0: DECL_NAME, demangled as | |
210 | necessary. 1: and scope information. 2: and any other | |
211 | information that might be interesting, such as function parameter | |
212 | types in C++. */ | |
213 | const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity)); | |
214 | ||
215 | /* Set yydebug for bison-based parsers, when -dy is given on the | |
216 | command line. By default, if the parameter is non-zero, prints a | |
217 | warning that the front end does not use such a parser. */ | |
218 | void (*set_yydebug) PARAMS ((int)); | |
219 | ||
220 | struct lang_hooks_for_tree_inlining tree_inlining; | |
221 | ||
222 | struct lang_hooks_for_tree_dump tree_dump; | |
223 | ||
224 | struct lang_hooks_for_decls decls; | |
225 | ||
226 | /* Whenever you add entries here, make sure you adjust langhooks-def.h | |
227 | and langhooks.c accordingly. */ | |
228 | }; | |
229 | ||
230 | /* Each front end provides its own. */ | |
231 | extern const struct lang_hooks lang_hooks; | |
232 | ||
233 | #endif /* GCC_LANG_HOOKS_H */ |