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1.1 root 1: /* Definitions for C parsing and type checking.
2: Copyright (C) 1987 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
19:
20: /* Language-dependent contents of an identifier. */
21:
22: struct lang_identifier
23: {
24: struct tree_identifier ignore;
25: tree global_value, local_value, label_value, implicit_decl;
26: tree error_locus;
27: };
28:
29: /* Macros for access to language-specific slots in an identifier. */
30:
31: #define IDENTIFIER_GLOBAL_VALUE(NODE) \
32: (((struct lang_identifier *)(NODE))->global_value)
33: #define IDENTIFIER_LOCAL_VALUE(NODE) \
34: (((struct lang_identifier *)(NODE))->local_value)
35: #define IDENTIFIER_LABEL_VALUE(NODE) \
36: (((struct lang_identifier *)(NODE))->label_value)
37: #define IDENTIFIER_IMPLICIT_DECL(NODE) \
38: (((struct lang_identifier *)(NODE))->implicit_decl)
39: #define IDENTIFIER_ERROR_LOCUS(NODE) \
40: (((struct lang_identifier *)(NODE))->error_locus)
41:
42: /* In identifiers, C uses the following fields in a special way:
43: TREE_PUBLIC to record that there was a previous local extern decl.
44: TREE_USED to record that such a decl was used.
45: TREE_ADDRESSABLE to record that the address of such a decl was used. */
46:
47: /* Nonzero means reject anything that ANSI standard C forbids. */
48: extern int pedantic;
49:
50: /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
51: #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
52:
53: /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
54: #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
55:
56: /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
57: nonzero if the definition of the type has already started. */
58: #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
59:
60: /* In a RECORD_TYPE, a sorted array of the fields of the type. */
61: struct lang_type
62: {
63: int len;
64: tree elts[1];
65: };
66:
67: /* Mark which labels are explicitly declared.
68: These may be shadowed, and may be referenced from nested functions. */
69: #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
70:
71: /* Record whether a type or decl was written with nonconstant size.
72: Note that TYPE_SIZE may have simplified to a constant. */
73: #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
74: #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
75:
76: /* Record in each node resulting from a binary operator
77: what operator was specified for it. */
78: #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
79:
80: #if 0 /* Not used. */
81: /* Record whether a decl for a function or function pointer has
82: already been mentioned (in a warning) because it was called
83: but didn't have a prototype. */
84: #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
85: #endif
86:
87: /* Store a value in that field. */
88: #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
89: (TREE_COMPLEXITY (exp) = (int)(code))
90:
91: /* Record whether a typedef for type `int' was actually `signed int'. */
92: #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
93:
94: /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
95: TYPE_ARG_TYPES for functions with prototypes, but created for functions
96: without prototypes. */
97: #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
98:
99: /* in c-typecheck.c */
100: extern tree build_component_ref (), build_conditional_expr (), build_compound_expr ();
101: extern tree build_unary_op (), build_binary_op (), build_function_call ();
102: extern tree parser_build_binary_op ();
103: extern tree build_indirect_ref (), build_array_ref (), build_c_cast ();
104: extern tree build_modify_expr ();
105: extern tree c_sizeof (), c_alignof (), c_alignof_expr ();
106: extern void store_init_value ();
107: extern tree digest_init ();
108: extern tree c_expand_start_case ();
109: extern tree default_conversion ();
110:
111: /* Given two integer or real types, return the type for their sum.
112: Given two compatible ANSI C types, returns the merged type. */
113:
114: extern tree common_type ();
115:
116: /* in c-decl.c */
117: extern tree build_label ();
118:
119: extern int start_function ();
120: extern void finish_function ();
121: extern void store_parm_decls ();
122: extern tree get_parm_info ();
123: extern tree combine_parm_decls ();
124:
125: extern void pushlevel ();
126: extern tree poplevel ();
127:
128: extern tree groktypename (), lookup_name ();
129:
130: extern tree lookup_label (), define_label (), shadow_label ();
131:
132: extern tree implicitly_declare (), getdecls (), gettags ();
133:
134: extern tree start_decl ();
135: extern void finish_decl ();
136:
137: extern tree start_struct (), finish_struct (), xref_tag ();
138: extern tree grokfield ();
139:
140: extern tree start_enum (), finish_enum ();
141: extern tree build_enumerator ();
142:
143: extern tree make_index_type ();
144:
145: /* Add qualifiers to a type, in the fashion for C. */
146: extern tree c_build_type_variant ();
147:
148: /* Functions in c-common.c: */
149:
150: /* Concatenate a list of STRING_CST nodes into one STRING_CST. */
151: extern tree combine_strings ();
152:
153: /* Validate the expression after `case' and apply default promotions. */
154: extern tree check_case_value ();
155:
156: /* Print an error message for invalid operands to arith operation CODE.
157: NOP_EXPR is used as a special case (see truthvalue_conversion). */
158:
159: extern void binary_op_error ();
160:
161: /* Subroutine of build_binary_op, used for comparison operations.
162: See if the operands have both been converted from subword integer types
163: and, if so, perhaps change them both back to their original type. */
164:
165: extern tree shorten_compare ();
166:
167: /* Read the rest of the current #-directive line. */
168: extern char *get_directive_line ();
169:
170: extern int maybe_objc_comptypes ();
171: extern tree maybe_building_objc_message_expr ();
172:
173: /* Standard named or nameless data types of the C compiler. */
174:
175: extern tree short_integer_type_node, integer_type_node;
176: extern tree long_integer_type_node, long_long_integer_type_node;
177: extern tree short_unsigned_type_node, unsigned_type_node;
178: extern tree long_unsigned_type_node, long_long_unsigned_type_node;
179: extern tree ptrdiff_type_node;
180: extern tree unsigned_char_type_node, signed_char_type_node, char_type_node;
181: extern tree wchar_type_node, signed_wchar_type_node, unsigned_wchar_type_node;
182: extern tree float_type_node, double_type_node, long_double_type_node;
183: extern tree void_type_node, ptr_type_node, const_ptr_type_node;
184: extern tree string_type_node, const_string_type_node;
185: extern tree char_array_type_node, int_array_type_node, wchar_array_type_node;
186: extern tree default_function_type;
187: extern tree double_ftype_double, double_ftype_double_double;
188: extern tree int_ftype_int, long_ftype_long;
189: extern tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int;
190: extern tree void_ftype_ptr_int_int, string_ftype_ptr_ptr;
191: extern tree int_ftype_string_string, int_ftype_cptr_cptr_sizet;
192:
193: /* Set to 0 at beginning of a function definition, set to 1 if
194: a return statement that specifies a return value is seen. */
195:
196: extern int current_function_returns_value;
197:
198: /* Set to 0 at beginning of a function definition, set to 1 if
199: a return statement with no argument is seen. */
200:
201: extern int current_function_returns_null;
202:
203: /* Nonzero means `$' can be in an identifier. */
204:
205: extern int dollars_in_ident;
206:
207: /* Nonzero means allow type mismatches in conditional expressions;
208: just make their values `void'. */
209:
210: extern int flag_cond_mismatch;
211:
212: /* Nonzero means don't recognize the keyword `asm'. */
213:
214: extern int flag_no_asm;
215:
216: /* Nonzero means ignore `#ident' directives. */
217:
218: extern int flag_no_ident;
219:
220: /* Nonzero means warn about implicit declarations. */
221:
222: extern int warn_implicit;
223:
224: /* Nonzero means give string constants the type `const char *'
225: to get extra warnings from them. These warnings will be too numerous
226: to be useful, except in thoroughly ANSIfied programs. */
227:
228: extern int warn_write_strings;
229:
230: /* Nonzero means warn about sizeof (function) or addition/subtraction
231: of function pointers. */
232:
233: extern int warn_pointer_arith;
234:
235: /* Nonzero means warn for all old-style non-prototype function decls. */
236:
237: extern int warn_strict_prototypes;
238:
239: /* Nonzero means warn about multiple (redundant) decls for the same single
240: variable or function. */
241:
242: extern int warn_redundant_decls;
243:
244: /* Nonzero means warn about extern declarations of objects not at
245: file-scope level and about *all* declarations of functions (whether
246: extern or static) not at file-scope level. Note that we exclude
247: implicit function declarations. To get warnings about those, use
248: -Wimplicit. */
249:
250: extern int warn_nested_externs;
251:
252: /* Nonzero means warn about pointer casts that can drop a type qualifier
253: from the pointer target type. */
254:
255: extern int warn_cast_qual;
256:
257: /* Warn about traditional constructs whose meanings changed in ANSI C. */
258:
259: extern int warn_traditional;
260:
261: /* Warn about *printf or *scanf format/argument anomalies. */
262:
263: extern int warn_format;
264:
265: /* Warn about a subscript that has type char. */
266:
267: extern int warn_char_subscripts;
268:
269: /* Warn if a type conversion is done that might have confusing results. */
270:
271: extern int warn_conversion;
272:
273: /* Nonzero means do some things the same way PCC does. */
274:
275: extern int flag_traditional;
276:
277: /* Nonzero means warn about suggesting putting in ()'s. */
278:
279: extern int warn_parentheses;
280:
281: /* Nonzero means this is a function to call to perform comptypes
282: on two record types. */
283:
284: extern int (*comptypes_record_hook) ();
285:
286: /* Nonzero means we are reading code that came from a system header file. */
287:
288: extern int system_header_p;
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