parser-defs.h revision 98944 
1/* Parser definitions for GDB.
2   Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3   1998, 1999, 2000 Free Software Foundation, Inc.
4   Modified from expread.y by the Department of Computer Science at the
5   State University of New York at Buffalo.
6
7   This file is part of GDB.
8
9   This program is free software; you can redistribute it and/or modify
10   it under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2 of the License, or
12   (at your option) any later version.
13
14   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with this program; if not, write to the Free Software
21   Foundation, Inc., 59 Temple Place - Suite 330,
22   Boston, MA 02111-1307, USA.  */
23
24#if !defined (PARSER_DEFS_H)
25#define PARSER_DEFS_H 1
26
27#include "doublest.h"
28
29struct std_regs
30  {
31    char *name;
32    int regnum;
33  };
34
35extern struct std_regs *std_regs;
36extern unsigned num_std_regs;
37
38extern struct expression *expout;
39extern int expout_size;
40extern int expout_ptr;
41
42/* If this is nonzero, this block is used as the lexical context
43   for symbol names.  */
44
45extern struct block *expression_context_block;
46
47/* The innermost context required by the stack and register variables
48   we've encountered so far. */
49extern struct block *innermost_block;
50
51/* The block in which the most recently discovered symbol was found.
52   FIXME: Should be declared along with lookup_symbol in symtab.h; is not
53   related specifically to parsing.  */
54extern struct block *block_found;
55
56/* Number of arguments seen so far in innermost function call.  */
57extern int arglist_len;
58
59/* A string token, either a char-string or bit-string.  Char-strings are
60   used, for example, for the names of symbols. */
61
62struct stoken
63  {
64    /* Pointer to first byte of char-string or first bit of bit-string */
65    char *ptr;
66    /* Length of string in bytes for char-string or bits for bit-string */
67    int length;
68  };
69
70struct ttype
71  {
72    struct stoken stoken;
73    struct type *type;
74  };
75
76struct symtoken
77  {
78    struct stoken stoken;
79    struct symbol *sym;
80    int is_a_field_of_this;
81  };
82
83/* For parsing of complicated types.
84   An array should be preceded in the list by the size of the array.  */
85enum type_pieces
86  {
87    tp_end = -1,
88    tp_pointer,
89    tp_reference,
90    tp_array,
91    tp_function,
92    tp_const,
93    tp_volatile,
94    tp_space_identifier
95  };
96/* The stack can contain either an enum type_pieces or an int.  */
97union type_stack_elt
98  {
99    enum type_pieces piece;
100    int int_val;
101  };
102extern union type_stack_elt *type_stack;
103extern int type_stack_depth, type_stack_size;
104
105extern void write_exp_elt (union exp_element);
106
107extern void write_exp_elt_opcode (enum exp_opcode);
108
109extern void write_exp_elt_sym (struct symbol *);
110
111extern void write_exp_elt_longcst (LONGEST);
112
113extern void write_exp_elt_dblcst (DOUBLEST);
114
115extern void write_exp_elt_type (struct type *);
116
117extern void write_exp_elt_intern (struct internalvar *);
118
119extern void write_exp_string (struct stoken);
120
121extern void write_exp_bitstring (struct stoken);
122
123extern void write_exp_elt_block (struct block *);
124
125extern void write_exp_msymbol (struct minimal_symbol *,
126			       struct type *, struct type *);
127
128extern void write_dollar_variable (struct stoken str);
129
130extern struct symbol *parse_nested_classes_for_hpacc (char *, int, char **,
131						      int *, char **);
132
133extern char *find_template_name_end (char *);
134
135extern void start_arglist (void);
136
137extern int end_arglist (void);
138
139extern char *copy_name (struct stoken);
140
141extern void push_type (enum type_pieces);
142
143extern void push_type_int (int);
144
145extern void push_type_address_space (char *);
146
147extern enum type_pieces pop_type (void);
148
149extern int pop_type_int (void);
150
151extern int length_of_subexp (struct expression *, int);
152
153extern struct type *follow_types (struct type *);
154
155/* During parsing of a C expression, the pointer to the next character
156   is in this variable.  */
157
158extern char *lexptr;
159
160/* Tokens that refer to names do so with explicit pointer and length,
161   so they can share the storage that lexptr is parsing.
162
163   When it is necessary to pass a name to a function that expects
164   a null-terminated string, the substring is copied out
165   into a block of storage that namecopy points to.
166
167   namecopy is allocated once, guaranteed big enough, for each parsing.  */
168
169extern char *namecopy;
170
171/* Current depth in parentheses within the expression.  */
172
173extern int paren_depth;
174
175/* Nonzero means stop parsing on first comma (if not within parentheses).  */
176
177extern int comma_terminates;
178
179/* These codes indicate operator precedences for expression printing,
180   least tightly binding first.  */
181/* Adding 1 to a precedence value is done for binary operators,
182   on the operand which is more tightly bound, so that operators
183   of equal precedence within that operand will get parentheses.  */
184/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
185   they are used as the "surrounding precedence" to force
186   various kinds of things to be parenthesized.  */
187enum precedence
188  {
189    PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
190    PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
191    PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
192    PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
193  };
194
195/* Table mapping opcodes into strings for printing operators
196   and precedences of the operators.  */
197
198struct op_print
199  {
200    char *string;
201    enum exp_opcode opcode;
202    /* Precedence of operator.  These values are used only by comparisons.  */
203    enum precedence precedence;
204
205    /* For a binary operator:  1 iff right associate.
206       For a unary operator:  1 iff postfix. */
207    int right_assoc;
208  };
209
210/* The generic method for targets to specify how their registers are
211   named.  The mapping can be derived from three sources:
212   REGISTER_NAME; std_regs; or a target specific alias hook. */
213
214extern int target_map_name_to_register (char *, int);
215
216#endif /* PARSER_DEFS_H */
217