1 /* Parser definitions for GDB. 2 3 Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 4 1997, 1998, 1999, 2000, 2002 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 2 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, write to the Free Software 23 Foundation, Inc., 59 Temple Place - Suite 330, 24 Boston, MA 02111-1307, USA. */ 25 26 #if !defined (PARSER_DEFS_H) 27 #define PARSER_DEFS_H 1 28 29 #include "doublest.h" 30 31 struct block; 32 33 extern struct expression *expout; 34 extern int expout_size; 35 extern int expout_ptr; 36 37 /* If this is nonzero, this block is used as the lexical context 38 for symbol names. */ 39 40 extern struct block *expression_context_block; 41 42 /* If expression_context_block is non-zero, then this is the PC within 43 the block that we want to evaluate expressions at. When debugging 44 C or C++ code, we use this to find the exact line we're at, and 45 then look up the macro definitions active at that point. */ 46 extern CORE_ADDR expression_context_pc; 47 48 /* The innermost context required by the stack and register variables 49 we've encountered so far. */ 50 extern struct block *innermost_block; 51 52 /* The block in which the most recently discovered symbol was found. 53 FIXME: Should be declared along with lookup_symbol in symtab.h; is not 54 related specifically to parsing. */ 55 extern struct block *block_found; 56 57 /* Number of arguments seen so far in innermost function call. */ 58 extern int arglist_len; 59 60 /* A string token, either a char-string or bit-string. Char-strings are 61 used, for example, for the names of symbols. */ 62 63 struct stoken 64 { 65 /* Pointer to first byte of char-string or first bit of bit-string */ 66 char *ptr; 67 /* Length of string in bytes for char-string or bits for bit-string */ 68 int length; 69 }; 70 71 struct ttype 72 { 73 struct stoken stoken; 74 struct type *type; 75 }; 76 77 struct symtoken 78 { 79 struct stoken stoken; 80 struct symbol *sym; 81 int is_a_field_of_this; 82 }; 83 84 struct objc_class_str 85 { 86 struct stoken stoken; 87 struct type *type; 88 int class; 89 }; 90 91 92 /* For parsing of complicated types. 93 An array should be preceded in the list by the size of the array. */ 94 enum type_pieces 95 { 96 tp_end = -1, 97 tp_pointer, 98 tp_reference, 99 tp_array, 100 tp_function, 101 tp_const, 102 tp_volatile, 103 tp_space_identifier 104 }; 105 /* The stack can contain either an enum type_pieces or an int. */ 106 union type_stack_elt 107 { 108 enum type_pieces piece; 109 int int_val; 110 }; 111 extern union type_stack_elt *type_stack; 112 extern int type_stack_depth, type_stack_size; 113 114 extern void write_exp_elt (union exp_element); 115 116 extern void write_exp_elt_opcode (enum exp_opcode); 117 118 extern void write_exp_elt_sym (struct symbol *); 119 120 extern void write_exp_elt_longcst (LONGEST); 121 122 extern void write_exp_elt_dblcst (DOUBLEST); 123 124 extern void write_exp_elt_type (struct type *); 125 126 extern void write_exp_elt_intern (struct internalvar *); 127 128 extern void write_exp_string (struct stoken); 129 130 extern void write_exp_bitstring (struct stoken); 131 132 extern void write_exp_elt_block (struct block *); 133 134 extern void write_exp_msymbol (struct minimal_symbol *, 135 struct type *, struct type *); 136 137 extern void write_dollar_variable (struct stoken str); 138 139 extern struct symbol *parse_nested_classes_for_hpacc (char *, int, char **, 140 int *, char **); 141 142 extern char *find_template_name_end (char *); 143 144 extern void start_arglist (void); 145 146 extern int end_arglist (void); 147 148 extern char *copy_name (struct stoken); 149 150 extern void push_type (enum type_pieces); 151 152 extern void push_type_int (int); 153 154 extern void push_type_address_space (char *); 155 156 extern enum type_pieces pop_type (void); 157 158 extern int pop_type_int (void); 159 160 extern int length_of_subexp (struct expression *, int); 161 162 extern int dump_subexp (struct expression *, struct ui_file *, int); 163 164 extern int dump_subexp_body_standard (struct expression *, 165 struct ui_file *, int); 166 167 extern void operator_length (struct expression *, int, int *, int *); 168 169 extern void operator_length_standard (struct expression *, int, int *, int *); 170 171 extern char *op_name_standard (enum exp_opcode); 172 173 extern struct type *follow_types (struct type *); 174 175 /* During parsing of a C expression, the pointer to the next character 176 is in this variable. */ 177 178 extern char *lexptr; 179 180 /* After a token has been recognized, this variable points to it. 181 Currently used only for error reporting. */ 182 extern char *prev_lexptr; 183 184 /* Tokens that refer to names do so with explicit pointer and length, 185 so they can share the storage that lexptr is parsing. 186 187 When it is necessary to pass a name to a function that expects 188 a null-terminated string, the substring is copied out 189 into a block of storage that namecopy points to. 190 191 namecopy is allocated once, guaranteed big enough, for each parsing. */ 192 193 extern char *namecopy; 194 195 /* Current depth in parentheses within the expression. */ 196 197 extern int paren_depth; 198 199 /* Nonzero means stop parsing on first comma (if not within parentheses). */ 200 201 extern int comma_terminates; 202 203 /* These codes indicate operator precedences for expression printing, 204 least tightly binding first. */ 205 /* Adding 1 to a precedence value is done for binary operators, 206 on the operand which is more tightly bound, so that operators 207 of equal precedence within that operand will get parentheses. */ 208 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator; 209 they are used as the "surrounding precedence" to force 210 various kinds of things to be parenthesized. */ 211 enum precedence 212 { 213 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR, 214 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR, 215 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT, 216 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION 217 }; 218 219 /* Table mapping opcodes into strings for printing operators 220 and precedences of the operators. */ 221 222 struct op_print 223 { 224 char *string; 225 enum exp_opcode opcode; 226 /* Precedence of operator. These values are used only by comparisons. */ 227 enum precedence precedence; 228 229 /* For a binary operator: 1 iff right associate. 230 For a unary operator: 1 iff postfix. */ 231 int right_assoc; 232 }; 233 234 /* Information needed to print, prefixify, and evaluate expressions for 235 a given language. */ 236 237 struct exp_descriptor 238 { 239 /* Print subexpression. */ 240 void (*print_subexp) (struct expression *, int *, struct ui_file *, 241 enum precedence); 242 243 /* Returns number of exp_elements needed to represent an operator and 244 the number of subexpressions it takes. */ 245 void (*operator_length) (struct expression*, int, int*, int *); 246 247 /* Name of this operator for dumping purposes. */ 248 char *(*op_name) (enum exp_opcode); 249 250 /* Dump the rest of this (prefix) expression after the operator 251 itself has been printed. See dump_subexp_body_standard in 252 (expprint.c). */ 253 int (*dump_subexp_body) (struct expression *, struct ui_file *, int); 254 255 /* Evaluate an expression. */ 256 struct value *(*evaluate_exp) (struct type *, struct expression *, 257 int *, enum noside); 258 }; 259 260 261 /* Default descriptor containing standard definitions of all 262 elements. */ 263 extern const struct exp_descriptor exp_descriptor_standard; 264 265 /* Functions used by language-specific extended operators to (recursively) 266 print/dump subexpressions. */ 267 268 extern void print_subexp (struct expression *, int *, struct ui_file *, 269 enum precedence); 270 271 extern void print_subexp_standard (struct expression *, int *, 272 struct ui_file *, enum precedence); 273 274 /* Function used to avoid direct calls to fprintf 275 in the code generated by the bison parser. */ 276 277 extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3); 278 279 #endif /* PARSER_DEFS_H */ 280