343 lines
10 KiB
C
343 lines
10 KiB
C
/* Parser definitions for GDB.
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Copyright (C) 1986, 1989-2000, 2002, 2007-2012 Free Software
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Foundation, Inc.
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Modified from expread.y by the Department of Computer Science at the
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State University of New York at Buffalo.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (PARSER_DEFS_H)
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#define PARSER_DEFS_H 1
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#include "doublest.h"
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struct block;
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extern int parser_debug;
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extern struct expression *expout;
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extern int expout_size;
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extern int expout_ptr;
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#define parse_gdbarch (expout->gdbarch)
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#define parse_language (expout->language_defn)
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/* If this is nonzero, this block is used as the lexical context
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for symbol names. */
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extern struct block *expression_context_block;
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/* If expression_context_block is non-zero, then this is the PC within
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the block that we want to evaluate expressions at. When debugging
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C or C++ code, we use this to find the exact line we're at, and
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then look up the macro definitions active at that point. */
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extern CORE_ADDR expression_context_pc;
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/* The innermost context required by the stack and register variables
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we've encountered so far. */
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extern struct block *innermost_block;
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/* The block in which the most recently discovered symbol was found.
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FIXME: Should be declared along with lookup_symbol in symtab.h; is not
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related specifically to parsing. */
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extern struct block *block_found;
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/* Number of arguments seen so far in innermost function call. */
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extern int arglist_len;
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/* A string token, either a char-string or bit-string. Char-strings are
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used, for example, for the names of symbols. */
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struct stoken
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{
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/* Pointer to first byte of char-string or first bit of bit-string. */
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char *ptr;
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/* Length of string in bytes for char-string or bits for bit-string. */
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int length;
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};
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struct typed_stoken
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{
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/* A language-specific type field. */
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int type;
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/* Pointer to first byte of char-string or first bit of bit-string. */
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char *ptr;
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/* Length of string in bytes for char-string or bits for bit-string. */
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int length;
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};
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struct stoken_vector
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{
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int len;
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struct typed_stoken *tokens;
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};
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struct ttype
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{
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struct stoken stoken;
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struct type *type;
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};
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struct symtoken
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{
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struct stoken stoken;
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struct symbol *sym;
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int is_a_field_of_this;
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};
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struct objc_class_str
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{
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struct stoken stoken;
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struct type *type;
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int class;
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};
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/* For parsing of complicated types.
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An array should be preceded in the list by the size of the array. */
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enum type_pieces
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{
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tp_end = -1,
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tp_pointer,
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tp_reference,
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tp_array,
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tp_function,
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tp_const,
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tp_volatile,
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tp_space_identifier
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};
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/* The stack can contain either an enum type_pieces or an int. */
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union type_stack_elt
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{
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enum type_pieces piece;
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int int_val;
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};
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extern union type_stack_elt *type_stack;
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extern int type_stack_depth, type_stack_size;
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/* Helper function to initialize the expout, expout_size, expout_ptr
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trio before it is used to store expression elements created during
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the parsing of an expression. INITIAL_SIZE is the initial size of
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the expout array. LANG is the language used to parse the expression.
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And GDBARCH is the gdbarch to use during parsing. */
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extern void initialize_expout (int, const struct language_defn *,
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struct gdbarch *);
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/* Helper function that frees any unsed space in the expout array.
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It is generally used when the parser has just been parsed and
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created. */
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extern void reallocate_expout (void);
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/* Reverse an expression from suffix form (in which it is constructed)
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to prefix form (in which we can conveniently print or execute it).
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Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT
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is not -1 (i.e., we are trying to complete a field name), it will
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return the index of the subexpression which is the left-hand-side
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of the struct operation at EXPOUT_LAST_STRUCT. */
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extern int prefixify_expression (struct expression *expr);
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extern void write_exp_elt_opcode (enum exp_opcode);
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extern void write_exp_elt_sym (struct symbol *);
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extern void write_exp_elt_longcst (LONGEST);
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extern void write_exp_elt_dblcst (DOUBLEST);
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extern void write_exp_elt_decfloatcst (gdb_byte *);
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extern void write_exp_elt_type (struct type *);
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extern void write_exp_elt_intern (struct internalvar *);
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extern void write_exp_string (struct stoken);
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void write_exp_string_vector (int type, struct stoken_vector *vec);
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extern void write_exp_bitstring (struct stoken);
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extern void write_exp_elt_block (struct block *);
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extern void write_exp_elt_objfile (struct objfile *objfile);
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extern void write_exp_msymbol (struct minimal_symbol *);
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extern void write_dollar_variable (struct stoken str);
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extern void mark_struct_expression (void);
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extern char *find_template_name_end (char *);
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extern void start_arglist (void);
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extern int end_arglist (void);
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extern char *copy_name (struct stoken);
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extern void push_type (enum type_pieces);
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extern void push_type_int (int);
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extern void push_type_address_space (char *);
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extern enum type_pieces pop_type (void);
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extern int pop_type_int (void);
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extern int length_of_subexp (struct expression *, int);
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extern int dump_subexp (struct expression *, struct ui_file *, int);
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extern int dump_subexp_body_standard (struct expression *,
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struct ui_file *, int);
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extern void operator_length (const struct expression *, int, int *, int *);
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extern void operator_length_standard (const struct expression *, int, int *,
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int *);
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extern int operator_check_standard (struct expression *exp, int pos,
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int (*objfile_func)
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(struct objfile *objfile, void *data),
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void *data);
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extern char *op_name_standard (enum exp_opcode);
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extern struct type *follow_types (struct type *);
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extern void null_post_parser (struct expression **, int);
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extern int parse_float (const char *p, int len, DOUBLEST *d,
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const char **suffix);
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extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
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DOUBLEST *d, struct type **t);
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/* During parsing of a C expression, the pointer to the next character
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is in this variable. */
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extern char *lexptr;
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/* After a token has been recognized, this variable points to it.
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Currently used only for error reporting. */
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extern char *prev_lexptr;
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/* Current depth in parentheses within the expression. */
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extern int paren_depth;
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/* Nonzero means stop parsing on first comma (if not within parentheses). */
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extern int comma_terminates;
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/* These codes indicate operator precedences for expression printing,
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least tightly binding first. */
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/* Adding 1 to a precedence value is done for binary operators,
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on the operand which is more tightly bound, so that operators
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of equal precedence within that operand will get parentheses. */
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/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
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they are used as the "surrounding precedence" to force
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various kinds of things to be parenthesized. */
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enum precedence
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{
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PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
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PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
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PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
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PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
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};
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/* Table mapping opcodes into strings for printing operators
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and precedences of the operators. */
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struct op_print
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{
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char *string;
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enum exp_opcode opcode;
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/* Precedence of operator. These values are used only by comparisons. */
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enum precedence precedence;
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/* For a binary operator: 1 iff right associate.
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For a unary operator: 1 iff postfix. */
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int right_assoc;
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};
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/* Information needed to print, prefixify, and evaluate expressions for
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a given language. */
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struct exp_descriptor
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{
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/* Print subexpression. */
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void (*print_subexp) (struct expression *, int *, struct ui_file *,
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enum precedence);
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/* Returns number of exp_elements needed to represent an operator and
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the number of subexpressions it takes. */
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void (*operator_length) (const struct expression*, int, int*, int *);
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/* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
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referenced by the single operator of EXP at position POS. Operator
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parameters are located at positive (POS + number) offsets in EXP.
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The functions should never be called with NULL TYPE or NULL OBJFILE.
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Functions should get passed an arbitrary caller supplied DATA pointer.
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If any of the functions returns non-zero value then (any other) non-zero
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value should be immediately returned to the caller. Otherwise zero
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should be returned. */
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int (*operator_check) (struct expression *exp, int pos,
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int (*objfile_func) (struct objfile *objfile,
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void *data),
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void *data);
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/* Name of this operator for dumping purposes. */
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char *(*op_name) (enum exp_opcode);
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/* Dump the rest of this (prefix) expression after the operator
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itself has been printed. See dump_subexp_body_standard in
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(expprint.c). */
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int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
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/* Evaluate an expression. */
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struct value *(*evaluate_exp) (struct type *, struct expression *,
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int *, enum noside);
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};
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/* Default descriptor containing standard definitions of all
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elements. */
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extern const struct exp_descriptor exp_descriptor_standard;
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/* Functions used by language-specific extended operators to (recursively)
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print/dump subexpressions. */
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extern void print_subexp (struct expression *, int *, struct ui_file *,
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enum precedence);
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extern void print_subexp_standard (struct expression *, int *,
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struct ui_file *, enum precedence);
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/* Function used to avoid direct calls to fprintf
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in the code generated by the bison parser. */
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extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
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extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
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#endif /* PARSER_DEFS_H */
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