1 /* Parser definitions for GDB.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 Modified from expread.y by the Department of Computer Science at the
6 State University of New York at Buffalo.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #if !defined (PARSER_DEFS_H)
24 #define PARSER_DEFS_H 1
28 #include "expression.h"
34 extern int parser_debug
;
36 #define parse_gdbarch(ps) ((ps)->expout->gdbarch)
37 #define parse_language(ps) ((ps)->expout->language_defn)
41 /* The expression related to this parser state. */
43 struct expression
*expout
;
45 /* The size of the expression above. */
49 /* The number of elements already in the expression. This is used
50 to know where to put new elements. */
55 /* If this is nonzero, this block is used as the lexical context
58 extern const struct block
*expression_context_block
;
60 /* If expression_context_block is non-zero, then this is the PC within
61 the block that we want to evaluate expressions at. When debugging
62 C or C++ code, we use this to find the exact line we're at, and
63 then look up the macro definitions active at that point. */
64 extern CORE_ADDR expression_context_pc
;
66 /* The innermost context required by the stack and register variables
67 we've encountered so far. */
68 extern const struct block
*innermost_block
;
70 /* Number of arguments seen so far in innermost function call. */
71 extern int arglist_len
;
73 /* A string token, either a char-string or bit-string. Char-strings are
74 used, for example, for the names of symbols. */
78 /* Pointer to first byte of char-string or first bit of bit-string. */
80 /* Length of string in bytes for char-string or bits for bit-string. */
86 /* A language-specific type field. */
88 /* Pointer to first byte of char-string or first bit of bit-string. */
90 /* Length of string in bytes for char-string or bits for bit-string. */
97 struct typed_stoken
*tokens
;
102 struct stoken stoken
;
108 struct stoken stoken
;
109 struct block_symbol sym
;
110 int is_a_field_of_this
;
113 struct objc_class_str
115 struct stoken stoken
;
120 typedef struct type
*type_ptr
;
121 DEF_VEC_P (type_ptr
);
123 /* For parsing of complicated types.
124 An array should be preceded in the list by the size of the array. */
133 tp_function_with_arguments
,
139 /* The stack can contain either an enum type_pieces or an int. */
142 enum type_pieces piece
;
144 struct type_stack
*stack_val
;
145 VEC (type_ptr
) *typelist_val
;
148 /* The type stack is an instance of this structure. */
152 /* Elements on the stack. */
153 union type_stack_elt
*elements
;
154 /* Current stack depth. */
156 /* Allocated size of stack. */
160 /* Helper function to initialize the expout, expout_size, expout_ptr
161 trio inside PS before it is used to store expression elements created
162 during the parsing of an expression. INITIAL_SIZE is the initial size of
163 the expout array. LANG is the language used to parse the expression.
164 And GDBARCH is the gdbarch to use during parsing. */
166 extern void initialize_expout (struct parser_state
*ps
,
168 const struct language_defn
*lang
,
169 struct gdbarch
*gdbarch
);
171 /* Helper function that reallocates the EXPOUT inside PS in order to
172 eliminate any unused space. It is generally used when the expression
173 has just been parsed and created. */
175 extern void reallocate_expout (struct parser_state
*ps
);
177 /* Reverse an expression from suffix form (in which it is constructed)
178 to prefix form (in which we can conveniently print or execute it).
179 Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT
180 is not -1 (i.e., we are trying to complete a field name), it will
181 return the index of the subexpression which is the left-hand-side
182 of the struct operation at EXPOUT_LAST_STRUCT. */
184 extern int prefixify_expression (struct expression
*expr
);
186 extern void write_exp_elt_opcode (struct parser_state
*, enum exp_opcode
);
188 extern void write_exp_elt_sym (struct parser_state
*, struct symbol
*);
190 extern void write_exp_elt_longcst (struct parser_state
*, LONGEST
);
192 extern void write_exp_elt_dblcst (struct parser_state
*, DOUBLEST
);
194 extern void write_exp_elt_decfloatcst (struct parser_state
*, gdb_byte
*);
196 extern void write_exp_elt_type (struct parser_state
*, struct type
*);
198 extern void write_exp_elt_intern (struct parser_state
*, struct internalvar
*);
200 extern void write_exp_string (struct parser_state
*, struct stoken
);
202 void write_exp_string_vector (struct parser_state
*, int type
,
203 struct stoken_vector
*vec
);
205 extern void write_exp_bitstring (struct parser_state
*, struct stoken
);
207 extern void write_exp_elt_block (struct parser_state
*, const struct block
*);
209 extern void write_exp_elt_objfile (struct parser_state
*,
210 struct objfile
*objfile
);
212 extern void write_exp_msymbol (struct parser_state
*,
213 struct bound_minimal_symbol
);
215 extern void write_dollar_variable (struct parser_state
*, struct stoken str
);
217 extern void mark_struct_expression (struct parser_state
*);
219 extern const char *find_template_name_end (const char *);
221 extern void start_arglist (void);
223 extern int end_arglist (void);
225 extern char *copy_name (struct stoken
);
227 extern void insert_type (enum type_pieces
);
229 extern void push_type (enum type_pieces
);
231 extern void push_type_int (int);
233 extern void insert_type_address_space (struct parser_state
*, char *);
235 extern enum type_pieces
pop_type (void);
237 extern int pop_type_int (void);
239 extern struct type_stack
*get_type_stack (void);
241 extern struct type_stack
*append_type_stack (struct type_stack
*to
,
242 struct type_stack
*from
);
244 extern void push_type_stack (struct type_stack
*stack
);
246 extern void type_stack_cleanup (void *arg
);
248 extern void push_typelist (VEC (type_ptr
) *typelist
);
250 extern int dump_subexp (struct expression
*, struct ui_file
*, int);
252 extern int dump_subexp_body_standard (struct expression
*,
253 struct ui_file
*, int);
255 extern void operator_length (const struct expression
*, int, int *, int *);
257 extern void operator_length_standard (const struct expression
*, int, int *,
260 extern int operator_check_standard (struct expression
*exp
, int pos
,
262 (struct objfile
*objfile
, void *data
),
265 extern const char *op_name_standard (enum exp_opcode
);
267 extern struct type
*follow_types (struct type
*);
269 extern void null_post_parser (struct expression
**, int);
271 extern int parse_float (const char *p
, int len
, DOUBLEST
*d
,
272 const char **suffix
);
274 extern int parse_c_float (struct gdbarch
*gdbarch
, const char *p
, int len
,
275 DOUBLEST
*d
, struct type
**t
);
277 /* During parsing of a C expression, the pointer to the next character
278 is in this variable. */
280 extern const char *lexptr
;
282 /* After a token has been recognized, this variable points to it.
283 Currently used only for error reporting. */
284 extern const char *prev_lexptr
;
286 /* Current depth in parentheses within the expression. */
288 extern int paren_depth
;
290 /* Nonzero means stop parsing on first comma (if not within parentheses). */
292 extern int comma_terminates
;
294 /* These codes indicate operator precedences for expression printing,
295 least tightly binding first. */
296 /* Adding 1 to a precedence value is done for binary operators,
297 on the operand which is more tightly bound, so that operators
298 of equal precedence within that operand will get parentheses. */
299 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
300 they are used as the "surrounding precedence" to force
301 various kinds of things to be parenthesized. */
304 PREC_NULL
, PREC_COMMA
, PREC_ABOVE_COMMA
, PREC_ASSIGN
, PREC_LOGICAL_OR
,
305 PREC_LOGICAL_AND
, PREC_BITWISE_IOR
, PREC_BITWISE_AND
, PREC_BITWISE_XOR
,
306 PREC_EQUAL
, PREC_ORDER
, PREC_SHIFT
, PREC_ADD
, PREC_MUL
, PREC_REPEAT
,
307 PREC_HYPER
, PREC_PREFIX
, PREC_SUFFIX
, PREC_BUILTIN_FUNCTION
310 /* Table mapping opcodes into strings for printing operators
311 and precedences of the operators. */
316 enum exp_opcode opcode
;
317 /* Precedence of operator. These values are used only by comparisons. */
318 enum precedence precedence
;
320 /* For a binary operator: 1 iff right associate.
321 For a unary operator: 1 iff postfix. */
325 /* Information needed to print, prefixify, and evaluate expressions for
328 struct exp_descriptor
330 /* Print subexpression. */
331 void (*print_subexp
) (struct expression
*, int *, struct ui_file
*,
334 /* Returns number of exp_elements needed to represent an operator and
335 the number of subexpressions it takes. */
336 void (*operator_length
) (const struct expression
*, int, int*, int *);
338 /* Call OBJFILE_FUNC for any objfile found being referenced by the
339 single operator of EXP at position POS. Operator parameters are
340 located at positive (POS + number) offsets in EXP. OBJFILE_FUNC
341 should never be called with NULL OBJFILE. OBJFILE_FUNC should
342 get passed an arbitrary caller supplied DATA pointer. If it
343 returns non-zero value then (any other) non-zero value should be
344 immediately returned to the caller. Otherwise zero should be
346 int (*operator_check
) (struct expression
*exp
, int pos
,
347 int (*objfile_func
) (struct objfile
*objfile
,
351 /* Name of this operator for dumping purposes.
352 The returned value should never be NULL, even if EXP_OPCODE is
353 an unknown opcode (a string containing an image of the numeric
354 value of the opcode can be returned, for instance). */
355 const char *(*op_name
) (enum exp_opcode
);
357 /* Dump the rest of this (prefix) expression after the operator
358 itself has been printed. See dump_subexp_body_standard in
360 int (*dump_subexp_body
) (struct expression
*, struct ui_file
*, int);
362 /* Evaluate an expression. */
363 struct value
*(*evaluate_exp
) (struct type
*, struct expression
*,
368 /* Default descriptor containing standard definitions of all
370 extern const struct exp_descriptor exp_descriptor_standard
;
372 /* Functions used by language-specific extended operators to (recursively)
373 print/dump subexpressions. */
375 extern void print_subexp (struct expression
*, int *, struct ui_file
*,
378 extern void print_subexp_standard (struct expression
*, int *,
379 struct ui_file
*, enum precedence
);
381 /* Function used to avoid direct calls to fprintf
382 in the code generated by the bison parser. */
384 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
386 extern int exp_uses_objfile (struct expression
*exp
, struct objfile
*objfile
);
388 extern void mark_completion_tag (enum type_code
, const char *ptr
,
391 /* Reallocate the `expout' pointer inside PS so that it can accommodate
392 at least LENELT expression elements. This function does nothing if
393 there is enough room for the elements. */
395 extern void increase_expout_size (struct parser_state
*ps
, size_t lenelt
);
397 #endif /* PARSER_DEFS_H */