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400 lines
12 KiB
C
400 lines
12 KiB
C
/* Parser definitions for GDB.
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Copyright (C) 1986-2017 Free Software 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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#include "vec.h"
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#include "expression.h"
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struct block;
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struct language_defn;
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struct internalvar;
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extern int parser_debug;
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#define parse_gdbarch(ps) ((ps)->expout->gdbarch)
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#define parse_language(ps) ((ps)->expout->language_defn)
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struct parser_state
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{
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/* The expression related to this parser state. */
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struct expression *expout;
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/* The size of the expression above. */
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size_t expout_size;
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/* The number of elements already in the expression. This is used
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to know where to put new elements. */
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size_t expout_ptr;
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};
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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 const 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 const struct block *innermost_block;
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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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const 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 block_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 theclass;
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};
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typedef struct type *type_ptr;
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DEF_VEC_P (type_ptr);
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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_function_with_arguments,
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tp_const,
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tp_volatile,
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tp_space_identifier,
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tp_type_stack
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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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struct type_stack *stack_val;
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VEC (type_ptr) *typelist_val;
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};
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/* The type stack is an instance of this structure. */
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struct type_stack
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{
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/* Elements on the stack. */
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union type_stack_elt *elements;
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/* Current stack depth. */
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int depth;
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/* Allocated size of stack. */
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int size;
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};
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/* Helper function to initialize the expout, expout_size, expout_ptr
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trio inside PS before it is used to store expression elements created
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during 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 (struct parser_state *ps,
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size_t initial_size,
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const struct language_defn *lang,
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struct gdbarch *gdbarch);
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/* Helper function that reallocates the EXPOUT inside PS in order to
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eliminate any unused space. It is generally used when the expression
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has just been parsed and created. */
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extern void reallocate_expout (struct parser_state *ps);
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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 (struct parser_state *, enum exp_opcode);
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extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
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extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
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extern void write_exp_elt_dblcst (struct parser_state *, DOUBLEST);
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extern void write_exp_elt_decfloatcst (struct parser_state *, gdb_byte *);
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extern void write_exp_elt_type (struct parser_state *, struct type *);
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extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
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extern void write_exp_string (struct parser_state *, struct stoken);
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void write_exp_string_vector (struct parser_state *, int type,
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struct stoken_vector *vec);
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extern void write_exp_bitstring (struct parser_state *, struct stoken);
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extern void write_exp_elt_block (struct parser_state *, const struct block *);
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extern void write_exp_elt_objfile (struct parser_state *,
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struct objfile *objfile);
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extern void write_exp_msymbol (struct parser_state *,
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struct bound_minimal_symbol);
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extern void write_dollar_variable (struct parser_state *, struct stoken str);
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extern void mark_struct_expression (struct parser_state *);
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extern const char *find_template_name_end (const 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 insert_type (enum type_pieces);
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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 insert_type_address_space (struct parser_state *, 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 struct type_stack *get_type_stack (void);
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extern struct type_stack *append_type_stack (struct type_stack *to,
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struct type_stack *from);
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extern void push_type_stack (struct type_stack *stack);
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extern void type_stack_cleanup (void *arg);
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extern void push_typelist (VEC (type_ptr) *typelist);
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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 const 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 const 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 OBJFILE_FUNC for any objfile found being referenced by the
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single operator of EXP at position POS. Operator parameters are
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located at positive (POS + number) offsets in EXP. OBJFILE_FUNC
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should never be called with NULL OBJFILE. OBJFILE_FUNC should
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get passed an arbitrary caller supplied DATA pointer. If it
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returns non-zero value then (any other) non-zero value should be
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immediately returned to the caller. Otherwise zero should be
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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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The returned value should never be NULL, even if EXP_OPCODE is
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an unknown opcode (a string containing an image of the numeric
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value of the opcode can be returned, for instance). */
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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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extern void mark_completion_tag (enum type_code, const char *ptr,
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int length);
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/* Reallocate the `expout' pointer inside PS so that it can accommodate
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at least LENELT expression elements. This function does nothing if
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there is enough room for the elements. */
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extern void increase_expout_size (struct parser_state *ps, size_t lenelt);
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#endif /* PARSER_DEFS_H */
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