1 /* Parser definitions for GDB.
3 Copyright (C) 1986-2019 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
26 #include "common/vec.h"
27 #include "expression.h"
33 extern int parser_debug;
37 /* Constructor. LANG is the language used to parse the expression.
38 And GDBARCH is the gdbarch to use during parsing. */
40 parser_state (const struct language_defn *lang,
41 struct gdbarch *gdbarch);
43 DISABLE_COPY_AND_ASSIGN (parser_state);
45 /* Resize the allocated expression to the correct size, and return
46 it as an expression_up -- passing ownership to the caller. */
47 ATTRIBUTE_UNUSED_RESULT expression_up release ();
49 /* Return the gdbarch that was passed to the constructor. */
51 struct gdbarch *gdbarch ()
53 return expout->gdbarch;
56 /* Return the language that was passed to the constructor. */
58 const struct language_defn *language ()
60 return expout->language_defn;
63 /* The size of the expression above. */
67 /* The expression related to this parser state. */
71 /* The number of elements already in the expression. This is used
72 to know where to put new elements. */
77 /* If this is nonzero, this block is used as the lexical context
80 extern const struct block *expression_context_block;
82 /* If expression_context_block is non-zero, then this is the PC within
83 the block that we want to evaluate expressions at. When debugging
84 C or C++ code, we use this to find the exact line we're at, and
85 then look up the macro definitions active at that point. */
86 extern CORE_ADDR expression_context_pc;
88 /* When parsing expressions we track the innermost block that was
91 class innermost_block_tracker
94 innermost_block_tracker ()
95 : m_types (INNERMOST_BLOCK_FOR_SYMBOLS),
96 m_innermost_block (NULL)
99 /* Reset the currently stored innermost block. Usually called before
100 parsing a new expression. As the most common case is that we only
101 want to gather the innermost block for symbols in an expression, this
102 becomes the default block tracker type. */
103 void reset (innermost_block_tracker_types t = INNERMOST_BLOCK_FOR_SYMBOLS)
106 m_innermost_block = NULL;
109 /* Update the stored innermost block if the new block B is more inner
110 than the currently stored block, or if no block is stored yet. The
111 type T tells us whether the block B was for a symbol or for a
112 register. The stored innermost block is only updated if the type T is
113 a type we are interested in, the types we are interested in are held
114 in M_TYPES and set during RESET. */
115 void update (const struct block *b, innermost_block_tracker_types t);
117 /* Overload of main UPDATE method which extracts the block from BS. */
118 void update (const struct block_symbol &bs)
120 update (bs.block, INNERMOST_BLOCK_FOR_SYMBOLS);
123 /* Return the stored innermost block. Can be nullptr if no symbols or
124 registers were found during an expression parse, and so no innermost
125 block was defined. */
126 const struct block *block () const
128 return m_innermost_block;
132 /* The type of innermost block being looked for. */
133 innermost_block_tracker_types m_types;
135 /* The currently stored innermost block found while parsing an
137 const struct block *m_innermost_block;
140 /* The innermost context required by the stack and register variables
141 we've encountered so far. This is cleared by the expression
142 parsing functions before parsing an expression, and can queried
143 once the parse is complete. */
144 extern innermost_block_tracker innermost_block;
146 /* Number of arguments seen so far in innermost function call. */
147 extern int arglist_len;
149 /* A string token, either a char-string or bit-string. Char-strings are
150 used, for example, for the names of symbols. */
154 /* Pointer to first byte of char-string or first bit of bit-string. */
156 /* Length of string in bytes for char-string or bits for bit-string. */
162 /* A language-specific type field. */
164 /* Pointer to first byte of char-string or first bit of bit-string. */
166 /* Length of string in bytes for char-string or bits for bit-string. */
173 struct typed_stoken *tokens;
178 struct stoken stoken;
184 struct stoken stoken;
185 struct block_symbol sym;
186 int is_a_field_of_this;
189 struct objc_class_str
191 struct stoken stoken;
196 /* For parsing of complicated types.
197 An array should be preceded in the list by the size of the array. */
206 tp_function_with_arguments,
213 /* The stack can contain either an enum type_pieces or an int. */
216 enum type_pieces piece;
218 struct type_stack *stack_val;
219 std::vector<struct type *> *typelist_val;
222 /* The type stack is an instance of this structure. */
226 /* Elements on the stack. */
227 std::vector<union type_stack_elt> elements;
230 /* Reverse an expression from suffix form (in which it is constructed)
231 to prefix form (in which we can conveniently print or execute it).
232 Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT
233 is not -1 (i.e., we are trying to complete a field name), it will
234 return the index of the subexpression which is the left-hand-side
235 of the struct operation at EXPOUT_LAST_STRUCT. */
237 extern int prefixify_expression (struct expression *expr);
239 extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);
241 extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
243 extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
245 extern void write_exp_elt_floatcst (struct parser_state *, const gdb_byte *);
247 extern void write_exp_elt_type (struct parser_state *, struct type *);
249 extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
251 extern void write_exp_string (struct parser_state *, struct stoken);
253 void write_exp_string_vector (struct parser_state *, int type,
254 struct stoken_vector *vec);
256 extern void write_exp_bitstring (struct parser_state *, struct stoken);
258 extern void write_exp_elt_block (struct parser_state *, const struct block *);
260 extern void write_exp_elt_objfile (struct parser_state *,
261 struct objfile *objfile);
263 extern void write_exp_msymbol (struct parser_state *,
264 struct bound_minimal_symbol);
266 extern void write_dollar_variable (struct parser_state *, struct stoken str);
268 extern void mark_struct_expression (struct parser_state *);
270 extern const char *find_template_name_end (const char *);
272 extern void start_arglist (void);
274 extern int end_arglist (void);
276 extern char *copy_name (struct stoken);
278 extern void insert_type (enum type_pieces);
280 extern void push_type (enum type_pieces);
282 extern void push_type_int (int);
284 extern void insert_type_address_space (struct parser_state *, char *);
286 extern enum type_pieces pop_type (void);
288 extern int pop_type_int (void);
290 extern struct type_stack *get_type_stack (void);
292 extern struct type_stack *append_type_stack (struct type_stack *to,
293 struct type_stack *from);
295 extern void push_type_stack (struct type_stack *stack);
297 extern void push_typelist (std::vector<struct type *> *typelist);
299 extern int dump_subexp (struct expression *, struct ui_file *, int);
301 extern int dump_subexp_body_standard (struct expression *,
302 struct ui_file *, int);
304 extern void operator_length (const struct expression *, int, int *, int *);
306 extern void operator_length_standard (const struct expression *, int, int *,
309 extern int operator_check_standard (struct expression *exp, int pos,
311 (struct objfile *objfile, void *data),
314 extern const char *op_name_standard (enum exp_opcode);
316 extern struct type *follow_types (struct type *);
318 extern type_instance_flags follow_type_instance_flags ();
320 extern void null_post_parser (expression_up *, int);
322 extern bool parse_float (const char *p, int len,
323 const struct type *type, gdb_byte *data);
325 /* During parsing of a C expression, the pointer to the next character
326 is in this variable. */
328 extern const char *lexptr;
330 /* After a token has been recognized, this variable points to it.
331 Currently used only for error reporting. */
332 extern const char *prev_lexptr;
334 /* Current depth in parentheses within the expression. */
336 extern int paren_depth;
338 /* Nonzero means stop parsing on first comma (if not within parentheses). */
340 extern int comma_terminates;
342 /* These codes indicate operator precedences for expression printing,
343 least tightly binding first. */
344 /* Adding 1 to a precedence value is done for binary operators,
345 on the operand which is more tightly bound, so that operators
346 of equal precedence within that operand will get parentheses. */
347 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
348 they are used as the "surrounding precedence" to force
349 various kinds of things to be parenthesized. */
352 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
353 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
354 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
355 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
358 /* Table mapping opcodes into strings for printing operators
359 and precedences of the operators. */
364 enum exp_opcode opcode;
365 /* Precedence of operator. These values are used only by comparisons. */
366 enum precedence precedence;
368 /* For a binary operator: 1 iff right associate.
369 For a unary operator: 1 iff postfix. */
373 /* Information needed to print, prefixify, and evaluate expressions for
376 struct exp_descriptor
378 /* Print subexpression. */
379 void (*print_subexp) (struct expression *, int *, struct ui_file *,
382 /* Returns number of exp_elements needed to represent an operator and
383 the number of subexpressions it takes. */
384 void (*operator_length) (const struct expression*, int, int*, int *);
386 /* Call OBJFILE_FUNC for any objfile found being referenced by the
387 single operator of EXP at position POS. Operator parameters are
388 located at positive (POS + number) offsets in EXP. OBJFILE_FUNC
389 should never be called with NULL OBJFILE. OBJFILE_FUNC should
390 get passed an arbitrary caller supplied DATA pointer. If it
391 returns non-zero value then (any other) non-zero value should be
392 immediately returned to the caller. Otherwise zero should be
394 int (*operator_check) (struct expression *exp, int pos,
395 int (*objfile_func) (struct objfile *objfile,
399 /* Name of this operator for dumping purposes.
400 The returned value should never be NULL, even if EXP_OPCODE is
401 an unknown opcode (a string containing an image of the numeric
402 value of the opcode can be returned, for instance). */
403 const char *(*op_name) (enum exp_opcode);
405 /* Dump the rest of this (prefix) expression after the operator
406 itself has been printed. See dump_subexp_body_standard in
408 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
410 /* Evaluate an expression. */
411 struct value *(*evaluate_exp) (struct type *, struct expression *,
416 /* Default descriptor containing standard definitions of all
418 extern const struct exp_descriptor exp_descriptor_standard;
420 /* Functions used by language-specific extended operators to (recursively)
421 print/dump subexpressions. */
423 extern void print_subexp (struct expression *, int *, struct ui_file *,
426 extern void print_subexp_standard (struct expression *, int *,
427 struct ui_file *, enum precedence);
429 /* Function used to avoid direct calls to fprintf
430 in the code generated by the bison parser. */
432 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
434 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
436 extern void mark_completion_tag (enum type_code, const char *ptr,
439 #endif /* PARSER_DEFS_H */