1/* Parser definitions for GDB. 2 3 Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 4 1998, 1999, 2000, 2002, 2007 Free Software Foundation, Inc. 5 6 Modified from expread.y by the Department of Computer Science at the 7 State University of New York at Buffalo. 8 9 This file is part of GDB. 10 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. 15 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. 20 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/>. */ 23 24#if !defined (PARSER_DEFS_H) 25#define PARSER_DEFS_H 1 26 27#include "doublest.h" 28 29struct block; 30 31extern struct expression *expout; 32extern int expout_size; 33extern int expout_ptr; 34 35/* If this is nonzero, this block is used as the lexical context 36 for symbol names. */ 37 38extern struct block *expression_context_block; 39 40/* If expression_context_block is non-zero, then this is the PC within 41 the block that we want to evaluate expressions at. When debugging 42 C or C++ code, we use this to find the exact line we're at, and 43 then look up the macro definitions active at that point. */ 44extern CORE_ADDR expression_context_pc; 45 46/* The innermost context required by the stack and register variables 47 we've encountered so far. */ 48extern struct block *innermost_block; 49 50/* The block in which the most recently discovered symbol was found. 51 FIXME: Should be declared along with lookup_symbol in symtab.h; is not 52 related specifically to parsing. */ 53extern struct block *block_found; 54 55/* Number of arguments seen so far in innermost function call. */ 56extern int arglist_len; 57 58/* A string token, either a char-string or bit-string. Char-strings are 59 used, for example, for the names of symbols. */ 60 61struct stoken 62 { 63 /* Pointer to first byte of char-string or first bit of bit-string */ 64 char *ptr; 65 /* Length of string in bytes for char-string or bits for bit-string */ 66 int length; 67 }; 68 69struct ttype 70 { 71 struct stoken stoken; 72 struct type *type; 73 }; 74 75struct symtoken 76 { 77 struct stoken stoken; 78 struct symbol *sym; 79 int is_a_field_of_this; 80 }; 81 82struct objc_class_str 83 { 84 struct stoken stoken; 85 struct type *type; 86 int class; 87 }; 88 89 90/* For parsing of complicated types. 91 An array should be preceded in the list by the size of the array. */ 92enum type_pieces 93 { 94 tp_end = -1, 95 tp_pointer, 96 tp_reference, 97 tp_array, 98 tp_function, 99 tp_const, 100 tp_volatile, 101 tp_space_identifier 102 }; 103/* The stack can contain either an enum type_pieces or an int. */ 104union type_stack_elt 105 { 106 enum type_pieces piece; 107 int int_val; 108 }; 109extern union type_stack_elt *type_stack; 110extern int type_stack_depth, type_stack_size; 111 112extern void write_exp_elt (union exp_element); 113 114extern void write_exp_elt_opcode (enum exp_opcode); 115 116extern void write_exp_elt_sym (struct symbol *); 117 118extern void write_exp_elt_longcst (LONGEST); 119 120extern void write_exp_elt_dblcst (DOUBLEST); 121 122extern void write_exp_elt_type (struct type *); 123 124extern void write_exp_elt_intern (struct internalvar *); 125 126extern void write_exp_string (struct stoken); 127 128extern void write_exp_bitstring (struct stoken); 129 130extern void write_exp_elt_block (struct block *); 131 132extern void write_exp_elt_objfile (struct objfile *objfile); 133 134extern void write_exp_msymbol (struct minimal_symbol *, 135 struct type *, struct type *); 136 137extern void write_dollar_variable (struct stoken str); 138 139extern char *find_template_name_end (char *); 140 141extern void start_arglist (void); 142 143extern int end_arglist (void); 144 145extern char *copy_name (struct stoken); 146 147extern void push_type (enum type_pieces); 148 149extern void push_type_int (int); 150 151extern void push_type_address_space (char *); 152 153extern enum type_pieces pop_type (void); 154 155extern int pop_type_int (void); 156 157extern int length_of_subexp (struct expression *, int); 158 159extern int dump_subexp (struct expression *, struct ui_file *, int); 160 161extern int dump_subexp_body_standard (struct expression *, 162 struct ui_file *, int); 163 164extern void operator_length (struct expression *, int, int *, int *); 165 166extern void operator_length_standard (struct expression *, int, int *, int *); 167 168extern char *op_name_standard (enum exp_opcode); 169 170extern struct type *follow_types (struct type *); 171 172extern void null_post_parser (struct expression **, int); 173 174/* During parsing of a C expression, the pointer to the next character 175 is in this variable. */ 176 177extern char *lexptr; 178 179/* After a token has been recognized, this variable points to it. 180 Currently used only for error reporting. */ 181extern char *prev_lexptr; 182 183/* Tokens that refer to names do so with explicit pointer and length, 184 so they can share the storage that lexptr is parsing. 185 186 When it is necessary to pass a name to a function that expects 187 a null-terminated string, the substring is copied out 188 into a block of storage that namecopy points to. 189 190 namecopy is allocated once, guaranteed big enough, for each parsing. */ 191 192extern char *namecopy; 193 194/* Current depth in parentheses within the expression. */ 195 196extern int paren_depth; 197 198/* Nonzero means stop parsing on first comma (if not within parentheses). */ 199 200extern int comma_terminates; 201 202/* These codes indicate operator precedences for expression printing, 203 least tightly binding first. */ 204/* Adding 1 to a precedence value is done for binary operators, 205 on the operand which is more tightly bound, so that operators 206 of equal precedence within that operand will get parentheses. */ 207/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator; 208 they are used as the "surrounding precedence" to force 209 various kinds of things to be parenthesized. */ 210enum precedence 211 { 212 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR, 213 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR, 214 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT, 215 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION 216 }; 217 218/* Table mapping opcodes into strings for printing operators 219 and precedences of the operators. */ 220 221struct op_print 222 { 223 char *string; 224 enum exp_opcode opcode; 225 /* Precedence of operator. These values are used only by comparisons. */ 226 enum precedence precedence; 227 228 /* For a binary operator: 1 iff right associate. 229 For a unary operator: 1 iff postfix. */ 230 int right_assoc; 231 }; 232 233/* Information needed to print, prefixify, and evaluate expressions for 234 a given language. */ 235 236struct exp_descriptor 237 { 238 /* Print subexpression. */ 239 void (*print_subexp) (struct expression *, int *, struct ui_file *, 240 enum precedence); 241 242 /* Returns number of exp_elements needed to represent an operator and 243 the number of subexpressions it takes. */ 244 void (*operator_length) (struct expression*, int, int*, int *); 245 246 /* Name of this operator for dumping purposes. */ 247 char *(*op_name) (enum exp_opcode); 248 249 /* Dump the rest of this (prefix) expression after the operator 250 itself has been printed. See dump_subexp_body_standard in 251 (expprint.c). */ 252 int (*dump_subexp_body) (struct expression *, struct ui_file *, int); 253 254 /* Evaluate an expression. */ 255 struct value *(*evaluate_exp) (struct type *, struct expression *, 256 int *, enum noside); 257 }; 258 259 260/* Default descriptor containing standard definitions of all 261 elements. */ 262extern const struct exp_descriptor exp_descriptor_standard; 263 264/* Functions used by language-specific extended operators to (recursively) 265 print/dump subexpressions. */ 266 267extern void print_subexp (struct expression *, int *, struct ui_file *, 268 enum precedence); 269 270extern void print_subexp_standard (struct expression *, int *, 271 struct ui_file *, enum precedence); 272 273/* Function used to avoid direct calls to fprintf 274 in the code generated by the bison parser. */ 275 276extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3); 277 278#endif /* PARSER_DEFS_H */ 279