1 /* Parser definitions for GDB.
3 Copyright (C) 1986, 1989-2000, 2002, 2007-2012 Free Software
6 Modified from expread.y by the Department of Computer Science at the
7 State University of New York at Buffalo.
9 This file is part of GDB.
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.
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.
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/>. */
24 #if !defined (PARSER_DEFS_H)
25 #define PARSER_DEFS_H 1
31 extern int parser_debug;
33 extern struct expression *expout;
34 extern int expout_size;
35 extern int expout_ptr;
37 #define parse_gdbarch (expout->gdbarch)
38 #define parse_language (expout->language_defn)
40 /* If this is nonzero, this block is used as the lexical context
43 extern struct block *expression_context_block;
45 /* If expression_context_block is non-zero, then this is the PC within
46 the block that we want to evaluate expressions at. When debugging
47 C or C++ code, we use this to find the exact line we're at, and
48 then look up the macro definitions active at that point. */
49 extern CORE_ADDR expression_context_pc;
51 /* The innermost context required by the stack and register variables
52 we've encountered so far. */
53 extern struct block *innermost_block;
55 /* The block in which the most recently discovered symbol was found.
56 FIXME: Should be declared along with lookup_symbol in symtab.h; is not
57 related specifically to parsing. */
58 extern struct block *block_found;
60 /* Number of arguments seen so far in innermost function call. */
61 extern int arglist_len;
63 /* A string token, either a char-string or bit-string. Char-strings are
64 used, for example, for the names of symbols. */
68 /* Pointer to first byte of char-string or first bit of bit-string. */
70 /* Length of string in bytes for char-string or bits for bit-string. */
76 /* A language-specific type field. */
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. */
87 struct typed_stoken *tokens;
100 int is_a_field_of_this;
103 struct objc_class_str
105 struct stoken stoken;
111 /* For parsing of complicated types.
112 An array should be preceded in the list by the size of the array. */
124 /* The stack can contain either an enum type_pieces or an int. */
127 enum type_pieces piece;
131 /* The type stack is an instance of this structure. */
135 /* Elements on the stack. */
136 union type_stack_elt *elements;
137 /* Current stack depth. */
139 /* Allocated size of stack. */
143 /* Helper function to initialize the expout, expout_size, expout_ptr
144 trio before it is used to store expression elements created during
145 the parsing of an expression. INITIAL_SIZE is the initial size of
146 the expout array. LANG is the language used to parse the expression.
147 And GDBARCH is the gdbarch to use during parsing. */
149 extern void initialize_expout (int, const struct language_defn *,
152 /* Helper function that frees any unsed space in the expout array.
153 It is generally used when the parser has just been parsed and
156 extern void reallocate_expout (void);
158 /* Reverse an expression from suffix form (in which it is constructed)
159 to prefix form (in which we can conveniently print or execute it).
160 Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT
161 is not -1 (i.e., we are trying to complete a field name), it will
162 return the index of the subexpression which is the left-hand-side
163 of the struct operation at EXPOUT_LAST_STRUCT. */
165 extern int prefixify_expression (struct expression *expr);
167 extern void write_exp_elt_opcode (enum exp_opcode);
169 extern void write_exp_elt_sym (struct symbol *);
171 extern void write_exp_elt_longcst (LONGEST);
173 extern void write_exp_elt_dblcst (DOUBLEST);
175 extern void write_exp_elt_decfloatcst (gdb_byte *);
177 extern void write_exp_elt_type (struct type *);
179 extern void write_exp_elt_intern (struct internalvar *);
181 extern void write_exp_string (struct stoken);
183 void write_exp_string_vector (int type, struct stoken_vector *vec);
185 extern void write_exp_bitstring (struct stoken);
187 extern void write_exp_elt_block (struct block *);
189 extern void write_exp_elt_objfile (struct objfile *objfile);
191 extern void write_exp_msymbol (struct minimal_symbol *);
193 extern void write_dollar_variable (struct stoken str);
195 extern void mark_struct_expression (void);
197 extern char *find_template_name_end (char *);
199 extern void start_arglist (void);
201 extern int end_arglist (void);
203 extern char *copy_name (struct stoken);
205 extern void insert_type (enum type_pieces);
207 extern void push_type (enum type_pieces);
209 extern void push_type_int (int);
211 extern void insert_type_address_space (char *);
213 extern enum type_pieces pop_type (void);
215 extern int pop_type_int (void);
217 extern int length_of_subexp (struct expression *, int);
219 extern int dump_subexp (struct expression *, struct ui_file *, int);
221 extern int dump_subexp_body_standard (struct expression *,
222 struct ui_file *, int);
224 extern void operator_length (const struct expression *, int, int *, int *);
226 extern void operator_length_standard (const struct expression *, int, int *,
229 extern int operator_check_standard (struct expression *exp, int pos,
231 (struct objfile *objfile, void *data),
234 extern char *op_name_standard (enum exp_opcode);
236 extern struct type *follow_types (struct type *);
238 extern void null_post_parser (struct expression **, int);
240 extern int parse_float (const char *p, int len, DOUBLEST *d,
241 const char **suffix);
243 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
244 DOUBLEST *d, struct type **t);
246 /* During parsing of a C expression, the pointer to the next character
247 is in this variable. */
251 /* After a token has been recognized, this variable points to it.
252 Currently used only for error reporting. */
253 extern char *prev_lexptr;
255 /* Current depth in parentheses within the expression. */
257 extern int paren_depth;
259 /* Nonzero means stop parsing on first comma (if not within parentheses). */
261 extern int comma_terminates;
263 /* These codes indicate operator precedences for expression printing,
264 least tightly binding first. */
265 /* Adding 1 to a precedence value is done for binary operators,
266 on the operand which is more tightly bound, so that operators
267 of equal precedence within that operand will get parentheses. */
268 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
269 they are used as the "surrounding precedence" to force
270 various kinds of things to be parenthesized. */
273 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
274 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
275 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
276 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
279 /* Table mapping opcodes into strings for printing operators
280 and precedences of the operators. */
285 enum exp_opcode opcode;
286 /* Precedence of operator. These values are used only by comparisons. */
287 enum precedence precedence;
289 /* For a binary operator: 1 iff right associate.
290 For a unary operator: 1 iff postfix. */
294 /* Information needed to print, prefixify, and evaluate expressions for
297 struct exp_descriptor
299 /* Print subexpression. */
300 void (*print_subexp) (struct expression *, int *, struct ui_file *,
303 /* Returns number of exp_elements needed to represent an operator and
304 the number of subexpressions it takes. */
305 void (*operator_length) (const struct expression*, int, int*, int *);
307 /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
308 referenced by the single operator of EXP at position POS. Operator
309 parameters are located at positive (POS + number) offsets in EXP.
310 The functions should never be called with NULL TYPE or NULL OBJFILE.
311 Functions should get passed an arbitrary caller supplied DATA pointer.
312 If any of the functions returns non-zero value then (any other) non-zero
313 value should be immediately returned to the caller. Otherwise zero
314 should be returned. */
315 int (*operator_check) (struct expression *exp, int pos,
316 int (*objfile_func) (struct objfile *objfile,
320 /* Name of this operator for dumping purposes. */
321 char *(*op_name) (enum exp_opcode);
323 /* Dump the rest of this (prefix) expression after the operator
324 itself has been printed. See dump_subexp_body_standard in
326 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
328 /* Evaluate an expression. */
329 struct value *(*evaluate_exp) (struct type *, struct expression *,
334 /* Default descriptor containing standard definitions of all
336 extern const struct exp_descriptor exp_descriptor_standard;
338 /* Functions used by language-specific extended operators to (recursively)
339 print/dump subexpressions. */
341 extern void print_subexp (struct expression *, int *, struct ui_file *,
344 extern void print_subexp_standard (struct expression *, int *,
345 struct ui_file *, enum precedence);
347 /* Function used to avoid direct calls to fprintf
348 in the code generated by the bison parser. */
350 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
352 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
354 #endif /* PARSER_DEFS_H */