/* Parser definitions for GDB.
- Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
- 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1986-2018 Free Software Foundation, Inc.
Modified from expread.y by the Department of Computer Science at the
State University of New York at Buffalo.
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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ 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 struct expression *expout;
-extern int expout_size;
-extern int expout_ptr;
+extern int parser_debug;
+
+#define parse_gdbarch(ps) ((ps)->expout->gdbarch)
+#define parse_language(ps) ((ps)->expout->language_defn)
+
+struct parser_state
+{
+ /* Constructor. 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. */
+
+ parser_state (size_t initial_size, const struct language_defn *lang,
+ struct gdbarch *gdbarch);
+
+ DISABLE_COPY_AND_ASSIGN (parser_state);
+
+ /* Resize the allocated expression to the correct size, and return
+ it as an expression_up -- passing ownership to the caller. */
+ expression_up release ();
+
+ /* The size of the expression above. */
+
+ size_t expout_size;
+
+ /* The expression related to this parser state. */
+
+ expression_up expout;
+
+ /* 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 struct block *expression_context_block;
+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
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 struct block *innermost_block;
+/* While parsing expressions we need to track the innermost lexical block
+ that we encounter. In some situations we need to track the innermost
+ block just for symbols, and in other situations we want to track the
+ innermost block for symbols and registers. These flags are used by the
+ innermost block tracker to control which blocks we consider for the
+ innermost block. These flags can be combined together as needed. */
+
+enum innermost_block_tracker_type
+{
+ /* Track the innermost block for symbols within an expression. */
+ INNERMOST_BLOCK_FOR_SYMBOLS = (1 << 0),
+
+ /* Track the innermost block for registers within an expression. */
+ INNERMOST_BLOCK_FOR_REGISTERS = (1 << 1)
+};
+DEF_ENUM_FLAGS_TYPE (enum innermost_block_tracker_type,
+ innermost_block_tracker_types);
+
+/* When parsing expressions we track the innermost block that was
+ referenced. */
+
+class innermost_block_tracker
+{
+public:
+ innermost_block_tracker ()
+ : m_types (INNERMOST_BLOCK_FOR_SYMBOLS),
+ m_innermost_block (NULL)
+ { /* Nothing. */ }
+
+ /* Reset the currently stored innermost block. Usually called before
+ parsing a new expression. As the most common case is that we only
+ want to gather the innermost block for symbols in an expression, this
+ becomes the default block tracker type. */
+ void reset (innermost_block_tracker_types t = INNERMOST_BLOCK_FOR_SYMBOLS)
+ {
+ m_types = t;
+ m_innermost_block = NULL;
+ }
+
+ /* Update the stored innermost block if the new block B is more inner
+ than the currently stored block, or if no block is stored yet. The
+ type T tells us whether the block B was for a symbol or for a
+ register. The stored innermost block is only updated if the type T is
+ a type we are interested in, the types we are interested in are held
+ in M_TYPES and set during RESET. */
+ void update (const struct block *b, innermost_block_tracker_types t);
+
+ /* Overload of main UPDATE method which extracts the block from BS. */
+ void update (const struct block_symbol &bs)
+ {
+ update (bs.block, INNERMOST_BLOCK_FOR_SYMBOLS);
+ }
+
+ /* Return the stored innermost block. Can be nullptr if no symbols or
+ registers were found during an expression parse, and so no innermost
+ block was defined. */
+ const struct block *block () const
+ {
+ return m_innermost_block;
+ }
-/* The block in which the most recently discovered symbol was found.
- FIXME: Should be declared along with lookup_symbol in symtab.h; is not
- related specifically to parsing. */
-extern struct block *block_found;
+private:
+ /* The type of innermost block being looked for. */
+ innermost_block_tracker_types m_types;
+
+ /* The currently stored innermost block found while parsing an
+ expression. */
+ const struct block *m_innermost_block;
+};
+
+/* The innermost context required by the stack and register variables
+ we've encountered so far. This should be cleared before parsing an
+ expression, and queried once the parse is complete. */
+extern innermost_block_tracker 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. */
+ used, for example, for the names of symbols. */
struct stoken
{
- /* Pointer to first byte of char-string or first bit of bit-string */
+ /* 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 */
+ /* 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 symtoken
{
struct stoken stoken;
- struct symbol *sym;
+ struct block_symbol sym;
int is_a_field_of_this;
};
{
struct stoken stoken;
struct type *type;
- int class;
+ int theclass;
};
+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. */
tp_end = -1,
tp_pointer,
tp_reference,
+ tp_rvalue_reference,
tp_array,
- tp_function,
+ tp_function,
+ tp_function_with_arguments,
tp_const,
tp_volatile,
- tp_space_identifier
+ 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;
};
-extern union type_stack_elt *type_stack;
-extern int type_stack_depth, type_stack_size;
-extern void write_exp_elt (union exp_element);
+/* The type stack is an instance of this structure. */
+
+struct type_stack
+{
+ /* Elements on the stack. */
+ std::vector<union type_stack_elt> elements;
+};
+
+/* 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_opcode (enum exp_opcode);
+extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
-extern void write_exp_elt_sym (struct symbol *);
+extern void write_exp_elt_floatcst (struct parser_state *, const gdb_byte *);
-extern void write_exp_elt_longcst (LONGEST);
+extern void write_exp_elt_type (struct parser_state *, struct type *);
-extern void write_exp_elt_dblcst (DOUBLEST);
+extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
-extern void write_exp_elt_type (struct type *);
+extern void write_exp_string (struct parser_state *, struct stoken);
-extern void write_exp_elt_intern (struct internalvar *);
+void write_exp_string_vector (struct parser_state *, int type,
+ struct stoken_vector *vec);
-extern void write_exp_string (struct stoken);
+extern void write_exp_bitstring (struct parser_state *, struct stoken);
-extern void write_exp_bitstring (struct stoken);
+extern void write_exp_elt_block (struct parser_state *, const struct block *);
-extern void write_exp_elt_block (struct block *);
+extern void write_exp_elt_objfile (struct parser_state *,
+ struct objfile *objfile);
-extern void write_exp_msymbol (struct minimal_symbol *,
- struct type *, struct type *);
+extern void write_exp_msymbol (struct parser_state *,
+ struct bound_minimal_symbol);
-extern void write_dollar_variable (struct stoken str);
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
-extern struct symbol *parse_nested_classes_for_hpacc (char *, int, char **,
- int *, char **);
+extern void mark_struct_expression (struct parser_state *);
-extern char *find_template_name_end (char *);
+extern const char *find_template_name_end (const char *);
extern void start_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 push_type_address_space (char *);
+extern void insert_type_address_space (struct parser_state *, char *);
extern enum type_pieces pop_type (void);
extern int pop_type_int (void);
-extern int length_of_subexp (struct expression *, int);
+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 dump_subexp (struct expression *, struct ui_file *, int);
extern int dump_subexp_body_standard (struct expression *,
struct ui_file *, int);
-extern void operator_length (struct expression *, int, int *, int *);
+extern void operator_length (const struct expression *, int, int *, int *);
+
+extern void operator_length_standard (const struct expression *, int, int *,
+ int *);
-extern void operator_length_standard (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 const char *op_name_standard (enum exp_opcode);
extern struct type *follow_types (struct type *);
-extern void null_post_parser (struct expression **, int);
+extern type_instance_flags follow_type_instance_flags ();
+
+extern void null_post_parser (expression_up *, int);
+
+extern bool parse_float (const char *p, int len,
+ const struct type *type, gdb_byte *data);
/* During parsing of a C expression, the pointer to the next character
is in this variable. */
-extern char *lexptr;
+extern const char *lexptr;
-/* After a token has been recognized, this variable points to it.
+/* After a token has been recognized, this variable points to it.
Currently used only for error reporting. */
-extern char *prev_lexptr;
-
-/* Tokens that refer to names do so with explicit pointer and length,
- so they can share the storage that lexptr is parsing.
-
- When it is necessary to pass a name to a function that expects
- a null-terminated string, the substring is copied out
- into a block of storage that namecopy points to.
-
- namecopy is allocated once, guaranteed big enough, for each parsing. */
-
-extern char *namecopy;
+extern const char *prev_lexptr;
/* Current depth in parentheses within the expression. */
struct op_print
{
- char *string;
+ const 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. */
+ For a unary operator: 1 iff postfix. */
int right_assoc;
};
/* Returns number of exp_elements needed to represent an operator and
the number of subexpressions it takes. */
- void (*operator_length) (struct expression*, int, int*, int *);
-
- /* Name of this operator for dumping purposes. */
- char *(*op_name) (enum exp_opcode);
+ 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). */
+ const 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
/* Function used to avoid direct calls to fprintf
in the code generated by the bison parser. */
-extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3);
+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 */
+
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