399 lines
12 KiB
C
399 lines
12 KiB
C
/* Parser definitions for GDB.
|
||
|
||
Copyright (C) 1986-2015 Free Software Foundation, Inc.
|
||
|
||
Modified from expread.y by the Department of Computer Science at the
|
||
State University of New York at Buffalo.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#if !defined (PARSER_DEFS_H)
|
||
#define PARSER_DEFS_H 1
|
||
|
||
#include "doublest.h"
|
||
#include "vec.h"
|
||
#include "expression.h"
|
||
|
||
struct block;
|
||
struct language_defn;
|
||
struct internalvar;
|
||
|
||
extern int parser_debug;
|
||
|
||
#define parse_gdbarch(ps) ((ps)->expout->gdbarch)
|
||
#define parse_language(ps) ((ps)->expout->language_defn)
|
||
|
||
struct parser_state
|
||
{
|
||
/* The expression related to this parser state. */
|
||
|
||
struct expression *expout;
|
||
|
||
/* The size of the expression above. */
|
||
|
||
size_t expout_size;
|
||
|
||
/* The number of elements already in the expression. This is used
|
||
to know where to put new elements. */
|
||
|
||
size_t expout_ptr;
|
||
};
|
||
|
||
/* If this is nonzero, this block is used as the lexical context
|
||
for symbol names. */
|
||
|
||
extern const struct block *expression_context_block;
|
||
|
||
/* If expression_context_block is non-zero, then this is the PC within
|
||
the block that we want to evaluate expressions at. When debugging
|
||
C or C++ code, we use this to find the exact line we're at, and
|
||
then look up the macro definitions active at that point. */
|
||
extern CORE_ADDR expression_context_pc;
|
||
|
||
/* The innermost context required by the stack and register variables
|
||
we've encountered so far. */
|
||
extern const struct block *innermost_block;
|
||
|
||
/* Number of arguments seen so far in innermost function call. */
|
||
extern int arglist_len;
|
||
|
||
/* A string token, either a char-string or bit-string. Char-strings are
|
||
used, for example, for the names of symbols. */
|
||
|
||
struct stoken
|
||
{
|
||
/* Pointer to first byte of char-string or first bit of bit-string. */
|
||
const char *ptr;
|
||
/* Length of string in bytes for char-string or bits for bit-string. */
|
||
int length;
|
||
};
|
||
|
||
struct typed_stoken
|
||
{
|
||
/* A language-specific type field. */
|
||
int type;
|
||
/* Pointer to first byte of char-string or first bit of bit-string. */
|
||
char *ptr;
|
||
/* Length of string in bytes for char-string or bits for bit-string. */
|
||
int length;
|
||
};
|
||
|
||
struct stoken_vector
|
||
{
|
||
int len;
|
||
struct typed_stoken *tokens;
|
||
};
|
||
|
||
struct ttype
|
||
{
|
||
struct stoken stoken;
|
||
struct type *type;
|
||
};
|
||
|
||
struct symtoken
|
||
{
|
||
struct stoken stoken;
|
||
struct symbol *sym;
|
||
int is_a_field_of_this;
|
||
};
|
||
|
||
struct objc_class_str
|
||
{
|
||
struct stoken stoken;
|
||
struct type *type;
|
||
int class;
|
||
};
|
||
|
||
typedef struct type *type_ptr;
|
||
DEF_VEC_P (type_ptr);
|
||
|
||
/* For parsing of complicated types.
|
||
An array should be preceded in the list by the size of the array. */
|
||
enum type_pieces
|
||
{
|
||
tp_end = -1,
|
||
tp_pointer,
|
||
tp_reference,
|
||
tp_array,
|
||
tp_function,
|
||
tp_function_with_arguments,
|
||
tp_const,
|
||
tp_volatile,
|
||
tp_space_identifier,
|
||
tp_type_stack
|
||
};
|
||
/* The stack can contain either an enum type_pieces or an int. */
|
||
union type_stack_elt
|
||
{
|
||
enum type_pieces piece;
|
||
int int_val;
|
||
struct type_stack *stack_val;
|
||
VEC (type_ptr) *typelist_val;
|
||
};
|
||
|
||
/* The type stack is an instance of this structure. */
|
||
|
||
struct type_stack
|
||
{
|
||
/* Elements on the stack. */
|
||
union type_stack_elt *elements;
|
||
/* Current stack depth. */
|
||
int depth;
|
||
/* Allocated size of stack. */
|
||
int size;
|
||
};
|
||
|
||
/* Helper function to initialize the expout, expout_size, expout_ptr
|
||
trio inside PS before it is used to store expression elements created
|
||
during the parsing of an expression. INITIAL_SIZE is the initial size of
|
||
the expout array. LANG is the language used to parse the expression.
|
||
And GDBARCH is the gdbarch to use during parsing. */
|
||
|
||
extern void initialize_expout (struct parser_state *ps,
|
||
size_t initial_size,
|
||
const struct language_defn *lang,
|
||
struct gdbarch *gdbarch);
|
||
|
||
/* Helper function that reallocates the EXPOUT inside PS in order to
|
||
eliminate any unused space. It is generally used when the expression
|
||
has just been parsed and created. */
|
||
|
||
extern void reallocate_expout (struct parser_state *ps);
|
||
|
||
/* Reverse an expression from suffix form (in which it is constructed)
|
||
to prefix form (in which we can conveniently print or execute it).
|
||
Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT
|
||
is not -1 (i.e., we are trying to complete a field name), it will
|
||
return the index of the subexpression which is the left-hand-side
|
||
of the struct operation at EXPOUT_LAST_STRUCT. */
|
||
|
||
extern int prefixify_expression (struct expression *expr);
|
||
|
||
extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);
|
||
|
||
extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
|
||
|
||
extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
|
||
|
||
extern void write_exp_elt_dblcst (struct parser_state *, DOUBLEST);
|
||
|
||
extern void write_exp_elt_decfloatcst (struct parser_state *, gdb_byte *);
|
||
|
||
extern void write_exp_elt_type (struct parser_state *, struct type *);
|
||
|
||
extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
|
||
|
||
extern void write_exp_string (struct parser_state *, struct stoken);
|
||
|
||
void write_exp_string_vector (struct parser_state *, int type,
|
||
struct stoken_vector *vec);
|
||
|
||
extern void write_exp_bitstring (struct parser_state *, struct stoken);
|
||
|
||
extern void write_exp_elt_block (struct parser_state *, const struct block *);
|
||
|
||
extern void write_exp_elt_objfile (struct parser_state *,
|
||
struct objfile *objfile);
|
||
|
||
extern void write_exp_msymbol (struct parser_state *,
|
||
struct bound_minimal_symbol);
|
||
|
||
extern void write_dollar_variable (struct parser_state *, struct stoken str);
|
||
|
||
extern void mark_struct_expression (struct parser_state *);
|
||
|
||
extern const char *find_template_name_end (const char *);
|
||
|
||
extern void start_arglist (void);
|
||
|
||
extern int end_arglist (void);
|
||
|
||
extern char *copy_name (struct stoken);
|
||
|
||
extern void insert_type (enum type_pieces);
|
||
|
||
extern void push_type (enum type_pieces);
|
||
|
||
extern void push_type_int (int);
|
||
|
||
extern void insert_type_address_space (struct parser_state *, char *);
|
||
|
||
extern enum type_pieces pop_type (void);
|
||
|
||
extern int pop_type_int (void);
|
||
|
||
extern struct type_stack *get_type_stack (void);
|
||
|
||
extern struct type_stack *append_type_stack (struct type_stack *to,
|
||
struct type_stack *from);
|
||
|
||
extern void push_type_stack (struct type_stack *stack);
|
||
|
||
extern void type_stack_cleanup (void *arg);
|
||
|
||
extern void push_typelist (VEC (type_ptr) *typelist);
|
||
|
||
extern int length_of_subexp (struct expression *, int);
|
||
|
||
extern int dump_subexp (struct expression *, struct ui_file *, int);
|
||
|
||
extern int dump_subexp_body_standard (struct expression *,
|
||
struct ui_file *, int);
|
||
|
||
extern void operator_length (const struct expression *, int, int *, int *);
|
||
|
||
extern void operator_length_standard (const struct expression *, int, int *,
|
||
int *);
|
||
|
||
extern int operator_check_standard (struct expression *exp, int pos,
|
||
int (*objfile_func)
|
||
(struct objfile *objfile, void *data),
|
||
void *data);
|
||
|
||
extern char *op_name_standard (enum exp_opcode);
|
||
|
||
extern struct type *follow_types (struct type *);
|
||
|
||
extern void null_post_parser (struct expression **, int);
|
||
|
||
extern int parse_float (const char *p, int len, DOUBLEST *d,
|
||
const char **suffix);
|
||
|
||
extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
|
||
DOUBLEST *d, struct type **t);
|
||
|
||
/* During parsing of a C expression, the pointer to the next character
|
||
is in this variable. */
|
||
|
||
extern const char *lexptr;
|
||
|
||
/* After a token has been recognized, this variable points to it.
|
||
Currently used only for error reporting. */
|
||
extern const char *prev_lexptr;
|
||
|
||
/* Current depth in parentheses within the expression. */
|
||
|
||
extern int paren_depth;
|
||
|
||
/* Nonzero means stop parsing on first comma (if not within parentheses). */
|
||
|
||
extern int comma_terminates;
|
||
|
||
/* These codes indicate operator precedences for expression printing,
|
||
least tightly binding first. */
|
||
/* Adding 1 to a precedence value is done for binary operators,
|
||
on the operand which is more tightly bound, so that operators
|
||
of equal precedence within that operand will get parentheses. */
|
||
/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
|
||
they are used as the "surrounding precedence" to force
|
||
various kinds of things to be parenthesized. */
|
||
enum precedence
|
||
{
|
||
PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
|
||
PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
|
||
PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
|
||
PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
|
||
};
|
||
|
||
/* Table mapping opcodes into strings for printing operators
|
||
and precedences of the operators. */
|
||
|
||
struct op_print
|
||
{
|
||
char *string;
|
||
enum exp_opcode opcode;
|
||
/* Precedence of operator. These values are used only by comparisons. */
|
||
enum precedence precedence;
|
||
|
||
/* For a binary operator: 1 iff right associate.
|
||
For a unary operator: 1 iff postfix. */
|
||
int right_assoc;
|
||
};
|
||
|
||
/* Information needed to print, prefixify, and evaluate expressions for
|
||
a given language. */
|
||
|
||
struct exp_descriptor
|
||
{
|
||
/* Print subexpression. */
|
||
void (*print_subexp) (struct expression *, int *, struct ui_file *,
|
||
enum precedence);
|
||
|
||
/* Returns number of exp_elements needed to represent an operator and
|
||
the number of subexpressions it takes. */
|
||
void (*operator_length) (const struct expression*, int, int*, int *);
|
||
|
||
/* Call OBJFILE_FUNC for any objfile found being referenced by the
|
||
single operator of EXP at position POS. Operator parameters are
|
||
located at positive (POS + number) offsets in EXP. OBJFILE_FUNC
|
||
should never be called with NULL OBJFILE. OBJFILE_FUNC should
|
||
get passed an arbitrary caller supplied DATA pointer. If it
|
||
returns non-zero value then (any other) non-zero value should be
|
||
immediately returned to the caller. Otherwise zero should be
|
||
returned. */
|
||
int (*operator_check) (struct expression *exp, int pos,
|
||
int (*objfile_func) (struct objfile *objfile,
|
||
void *data),
|
||
void *data);
|
||
|
||
/* Name of this operator for dumping purposes.
|
||
The returned value should never be NULL, even if EXP_OPCODE is
|
||
an unknown opcode (a string containing an image of the numeric
|
||
value of the opcode can be returned, for instance). */
|
||
char *(*op_name) (enum exp_opcode);
|
||
|
||
/* Dump the rest of this (prefix) expression after the operator
|
||
itself has been printed. See dump_subexp_body_standard in
|
||
(expprint.c). */
|
||
int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
|
||
|
||
/* Evaluate an expression. */
|
||
struct value *(*evaluate_exp) (struct type *, struct expression *,
|
||
int *, enum noside);
|
||
};
|
||
|
||
|
||
/* Default descriptor containing standard definitions of all
|
||
elements. */
|
||
extern const struct exp_descriptor exp_descriptor_standard;
|
||
|
||
/* Functions used by language-specific extended operators to (recursively)
|
||
print/dump subexpressions. */
|
||
|
||
extern void print_subexp (struct expression *, int *, struct ui_file *,
|
||
enum precedence);
|
||
|
||
extern void print_subexp_standard (struct expression *, int *,
|
||
struct ui_file *, enum precedence);
|
||
|
||
/* Function used to avoid direct calls to fprintf
|
||
in the code generated by the bison parser. */
|
||
|
||
extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
|
||
|
||
extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
|
||
|
||
extern void mark_completion_tag (enum type_code, const char *ptr,
|
||
int length);
|
||
|
||
/* Reallocate the `expout' pointer inside PS so that it can accommodate
|
||
at least LENELT expression elements. This function does nothing if
|
||
there is enough room for the elements. */
|
||
|
||
extern void increase_expout_size (struct parser_state *ps, size_t lenelt);
|
||
|
||
#endif /* PARSER_DEFS_H */
|
||
|