1 /* Parser definitions for GDB. 2 3 Copyright (C) 1986, 1989-2000, 2002, 2007-2012 Free Software 4 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 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 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 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 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 }; 109 110 111 /* For parsing of complicated types. 112 An array should be preceded in the list by the size of the array. */ 113 enum type_pieces 114 { 115 tp_end = -1, 116 tp_pointer, 117 tp_reference, 118 tp_array, 119 tp_function, 120 tp_const, 121 tp_volatile, 122 tp_space_identifier 123 }; 124 /* The stack can contain either an enum type_pieces or an int. */ 125 union type_stack_elt 126 { 127 enum type_pieces piece; 128 int int_val; 129 }; 130 extern union type_stack_elt *type_stack; 131 extern int type_stack_depth, type_stack_size; 132 133 extern void write_exp_elt_opcode (enum exp_opcode); 134 135 extern void write_exp_elt_sym (struct symbol *); 136 137 extern void write_exp_elt_longcst (LONGEST); 138 139 extern void write_exp_elt_dblcst (DOUBLEST); 140 141 extern void write_exp_elt_decfloatcst (gdb_byte *); 142 143 extern void write_exp_elt_type (struct type *); 144 145 extern void write_exp_elt_intern (struct internalvar *); 146 147 extern void write_exp_string (struct stoken); 148 149 void write_exp_string_vector (int type, struct stoken_vector *vec); 150 151 extern void write_exp_bitstring (struct stoken); 152 153 extern void write_exp_elt_block (struct block *); 154 155 extern void write_exp_elt_objfile (struct objfile *objfile); 156 157 extern void write_exp_msymbol (struct minimal_symbol *); 158 159 extern void write_dollar_variable (struct stoken str); 160 161 extern void mark_struct_expression (void); 162 163 extern char *find_template_name_end (char *); 164 165 extern void start_arglist (void); 166 167 extern int end_arglist (void); 168 169 extern char *copy_name (struct stoken); 170 171 extern void push_type (enum type_pieces); 172 173 extern void push_type_int (int); 174 175 extern void push_type_address_space (char *); 176 177 extern enum type_pieces pop_type (void); 178 179 extern int pop_type_int (void); 180 181 extern int length_of_subexp (struct expression *, int); 182 183 extern int dump_subexp (struct expression *, struct ui_file *, int); 184 185 extern int dump_subexp_body_standard (struct expression *, 186 struct ui_file *, int); 187 188 extern void operator_length (const struct expression *, int, int *, int *); 189 190 extern void operator_length_standard (const struct expression *, int, int *, 191 int *); 192 193 extern int operator_check_standard (struct expression *exp, int pos, 194 int (*objfile_func) 195 (struct objfile *objfile, void *data), 196 void *data); 197 198 extern char *op_name_standard (enum exp_opcode); 199 200 extern struct type *follow_types (struct type *); 201 202 extern void null_post_parser (struct expression **, int); 203 204 extern int parse_float (const char *p, int len, DOUBLEST *d, 205 const char **suffix); 206 207 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len, 208 DOUBLEST *d, struct type **t); 209 210 /* During parsing of a C expression, the pointer to the next character 211 is in this variable. */ 212 213 extern char *lexptr; 214 215 /* After a token has been recognized, this variable points to it. 216 Currently used only for error reporting. */ 217 extern char *prev_lexptr; 218 219 /* Tokens that refer to names do so with explicit pointer and length, 220 so they can share the storage that lexptr is parsing. 221 222 When it is necessary to pass a name to a function that expects 223 a null-terminated string, the substring is copied out 224 into a block of storage that namecopy points to. 225 226 namecopy is allocated once, guaranteed big enough, for each parsing. */ 227 228 extern char *namecopy; 229 230 /* Current depth in parentheses within the expression. */ 231 232 extern int paren_depth; 233 234 /* Nonzero means stop parsing on first comma (if not within parentheses). */ 235 236 extern int comma_terminates; 237 238 /* These codes indicate operator precedences for expression printing, 239 least tightly binding first. */ 240 /* Adding 1 to a precedence value is done for binary operators, 241 on the operand which is more tightly bound, so that operators 242 of equal precedence within that operand will get parentheses. */ 243 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator; 244 they are used as the "surrounding precedence" to force 245 various kinds of things to be parenthesized. */ 246 enum precedence 247 { 248 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR, 249 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR, 250 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT, 251 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION 252 }; 253 254 /* Table mapping opcodes into strings for printing operators 255 and precedences of the operators. */ 256 257 struct op_print 258 { 259 char *string; 260 enum exp_opcode opcode; 261 /* Precedence of operator. These values are used only by comparisons. */ 262 enum precedence precedence; 263 264 /* For a binary operator: 1 iff right associate. 265 For a unary operator: 1 iff postfix. */ 266 int right_assoc; 267 }; 268 269 /* Information needed to print, prefixify, and evaluate expressions for 270 a given language. */ 271 272 struct exp_descriptor 273 { 274 /* Print subexpression. */ 275 void (*print_subexp) (struct expression *, int *, struct ui_file *, 276 enum precedence); 277 278 /* Returns number of exp_elements needed to represent an operator and 279 the number of subexpressions it takes. */ 280 void (*operator_length) (const struct expression*, int, int*, int *); 281 282 /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being 283 referenced by the single operator of EXP at position POS. Operator 284 parameters are located at positive (POS + number) offsets in EXP. 285 The functions should never be called with NULL TYPE or NULL OBJFILE. 286 Functions should get passed an arbitrary caller supplied DATA pointer. 287 If any of the functions returns non-zero value then (any other) non-zero 288 value should be immediately returned to the caller. Otherwise zero 289 should be returned. */ 290 int (*operator_check) (struct expression *exp, int pos, 291 int (*objfile_func) (struct objfile *objfile, 292 void *data), 293 void *data); 294 295 /* Name of this operator for dumping purposes. */ 296 char *(*op_name) (enum exp_opcode); 297 298 /* Dump the rest of this (prefix) expression after the operator 299 itself has been printed. See dump_subexp_body_standard in 300 (expprint.c). */ 301 int (*dump_subexp_body) (struct expression *, struct ui_file *, int); 302 303 /* Evaluate an expression. */ 304 struct value *(*evaluate_exp) (struct type *, struct expression *, 305 int *, enum noside); 306 }; 307 308 309 /* Default descriptor containing standard definitions of all 310 elements. */ 311 extern const struct exp_descriptor exp_descriptor_standard; 312 313 /* Functions used by language-specific extended operators to (recursively) 314 print/dump subexpressions. */ 315 316 extern void print_subexp (struct expression *, int *, struct ui_file *, 317 enum precedence); 318 319 extern void print_subexp_standard (struct expression *, int *, 320 struct ui_file *, enum precedence); 321 322 /* Function used to avoid direct calls to fprintf 323 in the code generated by the bison parser. */ 324 325 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3); 326 327 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile); 328 329 #endif /* PARSER_DEFS_H */ 330