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