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 type_instance_flags follow_type_instance_flags ();
271 extern void null_post_parser (struct expression **, int);
273 extern int parse_float (const char *p, int len, DOUBLEST *d,
274 const char **suffix);
276 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
277 DOUBLEST *d, struct type **t);
279 /* During parsing of a C expression, the pointer to the next character
280 is in this variable. */
282 extern const char *lexptr;
284 /* After a token has been recognized, this variable points to it.
285 Currently used only for error reporting. */
286 extern const char *prev_lexptr;
288 /* Current depth in parentheses within the expression. */
290 extern int paren_depth;
292 /* Nonzero means stop parsing on first comma (if not within parentheses). */
294 extern int comma_terminates;
296 /* These codes indicate operator precedences for expression printing,
297 least tightly binding first. */
298 /* Adding 1 to a precedence value is done for binary operators,
299 on the operand which is more tightly bound, so that operators
300 of equal precedence within that operand will get parentheses. */
301 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
302 they are used as the "surrounding precedence" to force
303 various kinds of things to be parenthesized. */
306 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
307 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
308 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
309 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
312 /* Table mapping opcodes into strings for printing operators
313 and precedences of the operators. */
318 enum exp_opcode opcode;
319 /* Precedence of operator. These values are used only by comparisons. */
320 enum precedence precedence;
322 /* For a binary operator: 1 iff right associate.
323 For a unary operator: 1 iff postfix. */
327 /* Information needed to print, prefixify, and evaluate expressions for
330 struct exp_descriptor
332 /* Print subexpression. */
333 void (*print_subexp) (struct expression *, int *, struct ui_file *,
336 /* Returns number of exp_elements needed to represent an operator and
337 the number of subexpressions it takes. */
338 void (*operator_length) (const struct expression*, int, int*, int *);
340 /* Call OBJFILE_FUNC for any objfile found being referenced by the
341 single operator of EXP at position POS. Operator parameters are
342 located at positive (POS + number) offsets in EXP. OBJFILE_FUNC
343 should never be called with NULL OBJFILE. OBJFILE_FUNC should
344 get passed an arbitrary caller supplied DATA pointer. If it
345 returns non-zero value then (any other) non-zero value should be
346 immediately returned to the caller. Otherwise zero should be
348 int (*operator_check) (struct expression *exp, int pos,
349 int (*objfile_func) (struct objfile *objfile,
353 /* Name of this operator for dumping purposes.
354 The returned value should never be NULL, even if EXP_OPCODE is
355 an unknown opcode (a string containing an image of the numeric
356 value of the opcode can be returned, for instance). */
357 const char *(*op_name) (enum exp_opcode);
359 /* Dump the rest of this (prefix) expression after the operator
360 itself has been printed. See dump_subexp_body_standard in
362 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
364 /* Evaluate an expression. */
365 struct value *(*evaluate_exp) (struct type *, struct expression *,
370 /* Default descriptor containing standard definitions of all
372 extern const struct exp_descriptor exp_descriptor_standard;
374 /* Functions used by language-specific extended operators to (recursively)
375 print/dump subexpressions. */
377 extern void print_subexp (struct expression *, int *, struct ui_file *,
380 extern void print_subexp_standard (struct expression *, int *,
381 struct ui_file *, enum precedence);
383 /* Function used to avoid direct calls to fprintf
384 in the code generated by the bison parser. */
386 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
388 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
390 extern void mark_completion_tag (enum type_code, const char *ptr,
393 /* Reallocate the `expout' pointer inside PS so that it can accommodate
394 at least LENELT expression elements. This function does nothing if
395 there is enough room for the elements. */
397 extern void increase_expout_size (struct parser_state *ps, size_t lenelt);
399 #endif /* PARSER_DEFS_H */