/* Parser definitions for GDB.
- Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2002, 2007, 2008 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.
#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;
+ }
+
+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 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;
+/* 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. */
+ union type_stack_elt *elements;
+ /* Current stack depth. */
+ int depth;
+ /* Allocated size of stack. */
+ int size;
+};
-extern void write_exp_elt_opcode (enum exp_opcode);
+/* 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 void write_exp_elt_sym (struct symbol *);
+extern int prefixify_expression (struct expression *expr);
-extern void write_exp_elt_longcst (LONGEST);
+extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);
-extern void write_exp_elt_dblcst (DOUBLEST);
+extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
-extern void write_exp_elt_decfloatcst (gdb_byte *);
+extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
-extern void write_exp_elt_type (struct type *);
+extern void write_exp_elt_floatcst (struct parser_state *, const gdb_byte *);
-extern void write_exp_elt_intern (struct internalvar *);
+extern void write_exp_elt_type (struct parser_state *, struct type *);
-extern void write_exp_string (struct stoken);
+extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
-extern void write_exp_bitstring (struct stoken);
+extern void write_exp_string (struct parser_state *, struct stoken);
-extern void write_exp_elt_block (struct block *);
+void write_exp_string_vector (struct parser_state *, int type,
+ struct stoken_vector *vec);
-extern void write_exp_elt_objfile (struct objfile *objfile);
+extern void write_exp_bitstring (struct parser_state *, struct stoken);
-extern void write_exp_msymbol (struct minimal_symbol *,
- struct type *, struct type *);
+extern void write_exp_elt_block (struct parser_state *, const struct block *);
-extern void write_dollar_variable (struct stoken str);
+extern void write_exp_elt_objfile (struct parser_state *,
+ struct objfile *objfile);
-extern void mark_struct_expression (void);
+extern void write_exp_msymbol (struct parser_state *,
+ struct bound_minimal_symbol);
-extern char *find_template_name_end (char *);
+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 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 */
+