xref: /dragonfly/contrib/gdb-7/gdb/parser-defs.h (revision ef5ccd6c)
1 /* Parser definitions for GDB.
2 
3    Copyright (C) 1986-2013 Free Software Foundation, Inc.
4 
5    Modified from expread.y by the Department of Computer Science at the
6    State University of New York at Buffalo.
7 
8    This file is part of GDB.
9 
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.
14 
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.
19 
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/>.  */
22 
23 #if !defined (PARSER_DEFS_H)
24 #define PARSER_DEFS_H 1
25 
26 #include "doublest.h"
27 #include "vec.h"
28 
29 struct block;
30 
31 extern int parser_debug;
32 
33 extern struct expression *expout;
34 extern int expout_size;
35 extern int expout_ptr;
36 
37 #define parse_gdbarch (expout->gdbarch)
38 #define parse_language (expout->language_defn)
39 
40 /* If this is nonzero, this block is used as the lexical context
41    for symbol names.  */
42 
43 extern const struct block *expression_context_block;
44 
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;
50 
51 /* The innermost context required by the stack and register variables
52    we've encountered so far.  */
53 extern const struct block *innermost_block;
54 
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 const struct block *block_found;
59 
60 /* Number of arguments seen so far in innermost function call.  */
61 extern int arglist_len;
62 
63 /* A string token, either a char-string or bit-string.  Char-strings are
64    used, for example, for the names of symbols.  */
65 
66 struct stoken
67   {
68     /* Pointer to first byte of char-string or first bit of bit-string.  */
69     char *ptr;
70     /* Length of string in bytes for char-string or bits for bit-string.  */
71     int length;
72   };
73 
74 struct typed_stoken
75   {
76     /* A language-specific type field.  */
77     int type;
78     /* Pointer to first byte of char-string or first bit of bit-string.  */
79     char *ptr;
80     /* Length of string in bytes for char-string or bits for bit-string.  */
81     int length;
82   };
83 
84 struct stoken_vector
85   {
86     int len;
87     struct typed_stoken *tokens;
88   };
89 
90 struct ttype
91   {
92     struct stoken stoken;
93     struct type *type;
94   };
95 
96 struct symtoken
97   {
98     struct stoken stoken;
99     struct symbol *sym;
100     int is_a_field_of_this;
101   };
102 
103 struct objc_class_str
104   {
105     struct stoken stoken;
106     struct type *type;
107     int class;
108   };
109 
110 typedef struct type *type_ptr;
111 DEF_VEC_P (type_ptr);
112 
113 /* For parsing of complicated types.
114    An array should be preceded in the list by the size of the array.  */
115 enum type_pieces
116   {
117     tp_end = -1,
118     tp_pointer,
119     tp_reference,
120     tp_array,
121     tp_function,
122     tp_function_with_arguments,
123     tp_const,
124     tp_volatile,
125     tp_space_identifier,
126     tp_type_stack
127   };
128 /* The stack can contain either an enum type_pieces or an int.  */
129 union type_stack_elt
130   {
131     enum type_pieces piece;
132     int int_val;
133     struct type_stack *stack_val;
134     VEC (type_ptr) *typelist_val;
135   };
136 
137 /* The type stack is an instance of this structure.  */
138 
139 struct type_stack
140 {
141   /* Elements on the stack.  */
142   union type_stack_elt *elements;
143   /* Current stack depth.  */
144   int depth;
145   /* Allocated size of stack.  */
146   int size;
147 };
148 
149 /* Helper function to initialize the expout, expout_size, expout_ptr
150    trio before it is used to store expression elements created during
151    the parsing of an expression.  INITIAL_SIZE is the initial size of
152    the expout array.  LANG is the language used to parse the expression.
153    And GDBARCH is the gdbarch to use during parsing.  */
154 
155 extern void initialize_expout (int, const struct language_defn *,
156 			       struct gdbarch *);
157 
158 /* Helper function that frees any unsed space in the expout array.
159    It is generally used when the parser has just been parsed and
160    created.  */
161 
162 extern void reallocate_expout (void);
163 
164 /* Reverse an expression from suffix form (in which it is constructed)
165    to prefix form (in which we can conveniently print or execute it).
166    Ordinarily this always returns -1.  However, if EXPOUT_LAST_STRUCT
167    is not -1 (i.e., we are trying to complete a field name), it will
168    return the index of the subexpression which is the left-hand-side
169    of the struct operation at EXPOUT_LAST_STRUCT.  */
170 
171 extern int prefixify_expression (struct expression *expr);
172 
173 extern void write_exp_elt_opcode (enum exp_opcode);
174 
175 extern void write_exp_elt_sym (struct symbol *);
176 
177 extern void write_exp_elt_longcst (LONGEST);
178 
179 extern void write_exp_elt_dblcst (DOUBLEST);
180 
181 extern void write_exp_elt_decfloatcst (gdb_byte *);
182 
183 extern void write_exp_elt_type (struct type *);
184 
185 extern void write_exp_elt_intern (struct internalvar *);
186 
187 extern void write_exp_string (struct stoken);
188 
189 void write_exp_string_vector (int type, struct stoken_vector *vec);
190 
191 extern void write_exp_bitstring (struct stoken);
192 
193 extern void write_exp_elt_block (const struct block *);
194 
195 extern void write_exp_elt_objfile (struct objfile *objfile);
196 
197 extern void write_exp_msymbol (struct minimal_symbol *);
198 
199 extern void write_dollar_variable (struct stoken str);
200 
201 extern void mark_struct_expression (void);
202 
203 extern char *find_template_name_end (char *);
204 
205 extern void start_arglist (void);
206 
207 extern int end_arglist (void);
208 
209 extern char *copy_name (struct stoken);
210 
211 extern void insert_type (enum type_pieces);
212 
213 extern void push_type (enum type_pieces);
214 
215 extern void push_type_int (int);
216 
217 extern void insert_type_address_space (char *);
218 
219 extern enum type_pieces pop_type (void);
220 
221 extern int pop_type_int (void);
222 
223 extern struct type_stack *get_type_stack (void);
224 
225 extern struct type_stack *append_type_stack (struct type_stack *to,
226 					     struct type_stack *from);
227 
228 extern void push_type_stack (struct type_stack *stack);
229 
230 extern void type_stack_cleanup (void *arg);
231 
232 extern void push_typelist (VEC (type_ptr) *typelist);
233 
234 extern int length_of_subexp (struct expression *, int);
235 
236 extern int dump_subexp (struct expression *, struct ui_file *, int);
237 
238 extern int dump_subexp_body_standard (struct expression *,
239 				      struct ui_file *, int);
240 
241 extern void operator_length (const struct expression *, int, int *, int *);
242 
243 extern void operator_length_standard (const struct expression *, int, int *,
244 				      int *);
245 
246 extern int operator_check_standard (struct expression *exp, int pos,
247 				    int (*objfile_func)
248 				      (struct objfile *objfile, void *data),
249 				    void *data);
250 
251 extern char *op_name_standard (enum exp_opcode);
252 
253 extern struct type *follow_types (struct type *);
254 
255 extern void null_post_parser (struct expression **, int);
256 
257 extern int parse_float (const char *p, int len, DOUBLEST *d,
258 			const char **suffix);
259 
260 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
261 			  DOUBLEST *d, struct type **t);
262 
263 /* During parsing of a C expression, the pointer to the next character
264    is in this variable.  */
265 
266 extern char *lexptr;
267 
268 /* After a token has been recognized, this variable points to it.
269    Currently used only for error reporting.  */
270 extern char *prev_lexptr;
271 
272 /* Current depth in parentheses within the expression.  */
273 
274 extern int paren_depth;
275 
276 /* Nonzero means stop parsing on first comma (if not within parentheses).  */
277 
278 extern int comma_terminates;
279 
280 /* These codes indicate operator precedences for expression printing,
281    least tightly binding first.  */
282 /* Adding 1 to a precedence value is done for binary operators,
283    on the operand which is more tightly bound, so that operators
284    of equal precedence within that operand will get parentheses.  */
285 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
286    they are used as the "surrounding precedence" to force
287    various kinds of things to be parenthesized.  */
288 enum precedence
289   {
290     PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
291     PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
292     PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
293     PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
294   };
295 
296 /* Table mapping opcodes into strings for printing operators
297    and precedences of the operators.  */
298 
299 struct op_print
300   {
301     char *string;
302     enum exp_opcode opcode;
303     /* Precedence of operator.  These values are used only by comparisons.  */
304     enum precedence precedence;
305 
306     /* For a binary operator:  1 iff right associate.
307        For a unary operator:  1 iff postfix.  */
308     int right_assoc;
309   };
310 
311 /* Information needed to print, prefixify, and evaluate expressions for
312    a given language.  */
313 
314 struct exp_descriptor
315   {
316     /* Print subexpression.  */
317     void (*print_subexp) (struct expression *, int *, struct ui_file *,
318 			  enum precedence);
319 
320     /* Returns number of exp_elements needed to represent an operator and
321        the number of subexpressions it takes.  */
322     void (*operator_length) (const struct expression*, int, int*, int *);
323 
324     /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
325        referenced by the single operator of EXP at position POS.  Operator
326        parameters are located at positive (POS + number) offsets in EXP.
327        The functions should never be called with NULL TYPE or NULL OBJFILE.
328        Functions should get passed an arbitrary caller supplied DATA pointer.
329        If any of the functions returns non-zero value then (any other) non-zero
330        value should be immediately returned to the caller.  Otherwise zero
331        should be returned.  */
332     int (*operator_check) (struct expression *exp, int pos,
333 			   int (*objfile_func) (struct objfile *objfile,
334 						void *data),
335 			   void *data);
336 
337     /* Name of this operator for dumping purposes.
338        The returned value should never be NULL, even if EXP_OPCODE is
339        an unknown opcode (a string containing an image of the numeric
340        value of the opcode can be returned, for instance).  */
341     char *(*op_name) (enum exp_opcode);
342 
343     /* Dump the rest of this (prefix) expression after the operator
344        itself has been printed.  See dump_subexp_body_standard in
345        (expprint.c).  */
346     int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
347 
348     /* Evaluate an expression.  */
349     struct value *(*evaluate_exp) (struct type *, struct expression *,
350 				   int *, enum noside);
351   };
352 
353 
354 /* Default descriptor containing standard definitions of all
355    elements.  */
356 extern const struct exp_descriptor exp_descriptor_standard;
357 
358 /* Functions used by language-specific extended operators to (recursively)
359    print/dump subexpressions.  */
360 
361 extern void print_subexp (struct expression *, int *, struct ui_file *,
362 			  enum precedence);
363 
364 extern void print_subexp_standard (struct expression *, int *,
365 				   struct ui_file *, enum precedence);
366 
367 /* Function used to avoid direct calls to fprintf
368    in the code generated by the bison parser.  */
369 
370 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
371 
372 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
373 
374 extern void mark_completion_tag (enum type_code, const char *ptr,
375 				 int length);
376 
377 #endif /* PARSER_DEFS_H */
378 
379