Import gdb-7.0
[dragonfly.git] / contrib / gdb-7 / gdb / parser-defs.h
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1/* Parser definitions for GDB.
2
3 Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 1998, 1999, 2000, 2002, 2007, 2008, 2009 Free Software Foundation, Inc.
5
6 Modified from expread.y by the Department of Computer Science at the
7 State University of New York at Buffalo.
8
9 This file is part of GDB.
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23
24#if !defined (PARSER_DEFS_H)
25#define PARSER_DEFS_H 1
26
27#include "doublest.h"
28
29struct block;
30
31extern struct expression *expout;
32extern int expout_size;
33extern int expout_ptr;
34
35#define parse_gdbarch (expout->gdbarch)
36#define parse_language (expout->language_defn)
37
38/* If this is nonzero, this block is used as the lexical context
39 for symbol names. */
40
41extern struct block *expression_context_block;
42
43/* If expression_context_block is non-zero, then this is the PC within
44 the block that we want to evaluate expressions at. When debugging
45 C or C++ code, we use this to find the exact line we're at, and
46 then look up the macro definitions active at that point. */
47extern CORE_ADDR expression_context_pc;
48
49/* The innermost context required by the stack and register variables
50 we've encountered so far. */
51extern struct block *innermost_block;
52
53/* The block in which the most recently discovered symbol was found.
54 FIXME: Should be declared along with lookup_symbol in symtab.h; is not
55 related specifically to parsing. */
56extern struct block *block_found;
57
58/* Number of arguments seen so far in innermost function call. */
59extern int arglist_len;
60
61/* A string token, either a char-string or bit-string. Char-strings are
62 used, for example, for the names of symbols. */
63
64struct stoken
65 {
66 /* Pointer to first byte of char-string or first bit of bit-string */
67 char *ptr;
68 /* Length of string in bytes for char-string or bits for bit-string */
69 int length;
70 };
71
72struct typed_stoken
73 {
74 /* A language-specific type field. */
75 int type;
76 /* Pointer to first byte of char-string or first bit of bit-string */
77 char *ptr;
78 /* Length of string in bytes for char-string or bits for bit-string */
79 int length;
80 };
81
82struct stoken_vector
83 {
84 int len;
85 struct typed_stoken *tokens;
86 };
87
88struct ttype
89 {
90 struct stoken stoken;
91 struct type *type;
92 };
93
94struct symtoken
95 {
96 struct stoken stoken;
97 struct symbol *sym;
98 int is_a_field_of_this;
99 };
100
101struct objc_class_str
102 {
103 struct stoken stoken;
104 struct type *type;
105 int class;
106 };
107
108
109/* For parsing of complicated types.
110 An array should be preceded in the list by the size of the array. */
111enum type_pieces
112 {
113 tp_end = -1,
114 tp_pointer,
115 tp_reference,
116 tp_array,
117 tp_function,
118 tp_const,
119 tp_volatile,
120 tp_space_identifier
121 };
122/* The stack can contain either an enum type_pieces or an int. */
123union type_stack_elt
124 {
125 enum type_pieces piece;
126 int int_val;
127 };
128extern union type_stack_elt *type_stack;
129extern int type_stack_depth, type_stack_size;
130
131extern void write_exp_elt (union exp_element);
132
133extern void write_exp_elt_opcode (enum exp_opcode);
134
135extern void write_exp_elt_sym (struct symbol *);
136
137extern void write_exp_elt_longcst (LONGEST);
138
139extern void write_exp_elt_dblcst (DOUBLEST);
140
141extern void write_exp_elt_decfloatcst (gdb_byte *);
142
143extern void write_exp_elt_type (struct type *);
144
145extern void write_exp_elt_intern (struct internalvar *);
146
147extern void write_exp_string (struct stoken);
148
149void write_exp_string_vector (int type, struct stoken_vector *vec);
150
151extern void write_exp_bitstring (struct stoken);
152
153extern void write_exp_elt_block (struct block *);
154
155extern void write_exp_elt_objfile (struct objfile *objfile);
156
157extern void write_exp_msymbol (struct minimal_symbol *);
158
159extern void write_dollar_variable (struct stoken str);
160
161extern void mark_struct_expression (void);
162
163extern char *find_template_name_end (char *);
164
165extern void start_arglist (void);
166
167extern int end_arglist (void);
168
169extern char *copy_name (struct stoken);
170
171extern void push_type (enum type_pieces);
172
173extern void push_type_int (int);
174
175extern void push_type_address_space (char *);
176
177extern enum type_pieces pop_type (void);
178
179extern int pop_type_int (void);
180
181extern int length_of_subexp (struct expression *, int);
182
183extern int dump_subexp (struct expression *, struct ui_file *, int);
184
185extern int dump_subexp_body_standard (struct expression *,
186 struct ui_file *, int);
187
188extern void operator_length (struct expression *, int, int *, int *);
189
190extern void operator_length_standard (struct expression *, int, int *, int *);
191
192extern char *op_name_standard (enum exp_opcode);
193
194extern struct type *follow_types (struct type *);
195
196extern void null_post_parser (struct expression **, int);
197
198/* During parsing of a C expression, the pointer to the next character
199 is in this variable. */
200
201extern char *lexptr;
202
203/* After a token has been recognized, this variable points to it.
204 Currently used only for error reporting. */
205extern char *prev_lexptr;
206
207/* Tokens that refer to names do so with explicit pointer and length,
208 so they can share the storage that lexptr is parsing.
209
210 When it is necessary to pass a name to a function that expects
211 a null-terminated string, the substring is copied out
212 into a block of storage that namecopy points to.
213
214 namecopy is allocated once, guaranteed big enough, for each parsing. */
215
216extern char *namecopy;
217
218/* Current depth in parentheses within the expression. */
219
220extern int paren_depth;
221
222/* Nonzero means stop parsing on first comma (if not within parentheses). */
223
224extern int comma_terminates;
225\f
226/* These codes indicate operator precedences for expression printing,
227 least tightly binding first. */
228/* Adding 1 to a precedence value is done for binary operators,
229 on the operand which is more tightly bound, so that operators
230 of equal precedence within that operand will get parentheses. */
231/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
232 they are used as the "surrounding precedence" to force
233 various kinds of things to be parenthesized. */
234enum precedence
235 {
236 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
237 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
238 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
239 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
240 };
241
242/* Table mapping opcodes into strings for printing operators
243 and precedences of the operators. */
244
245struct op_print
246 {
247 char *string;
248 enum exp_opcode opcode;
249 /* Precedence of operator. These values are used only by comparisons. */
250 enum precedence precedence;
251
252 /* For a binary operator: 1 iff right associate.
253 For a unary operator: 1 iff postfix. */
254 int right_assoc;
255 };
256
257/* Information needed to print, prefixify, and evaluate expressions for
258 a given language. */
259
260struct exp_descriptor
261 {
262 /* Print subexpression. */
263 void (*print_subexp) (struct expression *, int *, struct ui_file *,
264 enum precedence);
265
266 /* Returns number of exp_elements needed to represent an operator and
267 the number of subexpressions it takes. */
268 void (*operator_length) (struct expression*, int, int*, int *);
269
270 /* Name of this operator for dumping purposes. */
271 char *(*op_name) (enum exp_opcode);
272
273 /* Dump the rest of this (prefix) expression after the operator
274 itself has been printed. See dump_subexp_body_standard in
275 (expprint.c). */
276 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
277
278 /* Evaluate an expression. */
279 struct value *(*evaluate_exp) (struct type *, struct expression *,
280 int *, enum noside);
281 };
282
283
284/* Default descriptor containing standard definitions of all
285 elements. */
286extern const struct exp_descriptor exp_descriptor_standard;
287
288/* Functions used by language-specific extended operators to (recursively)
289 print/dump subexpressions. */
290
291extern void print_subexp (struct expression *, int *, struct ui_file *,
292 enum precedence);
293
294extern void print_subexp_standard (struct expression *, int *,
295 struct ui_file *, enum precedence);
296
297/* Function used to avoid direct calls to fprintf
298 in the code generated by the bison parser. */
299
300extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3);
301
302#endif /* PARSER_DEFS_H */