/* Parser definitions for GDB.
- Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000 Free Software Foundation, Inc.
+
+ Copyright (C) 1986-2019 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, 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 "common/vec.h"
+#include "expression.h"
+
+struct block;
+struct language_defn;
+struct internalvar;
+
+extern int parser_debug;
+
+/* A class that can be used to build a "struct expression". */
+
+struct expr_builder
+{
+ /* Constructor. LANG is the language used to parse the expression.
+ And GDBARCH is the gdbarch to use during parsing. */
+
+ expr_builder (const struct language_defn *lang,
+ struct gdbarch *gdbarch);
+
+ DISABLE_COPY_AND_ASSIGN (expr_builder);
+
+ /* Resize the allocated expression to the correct size, and return
+ it as an expression_up -- passing ownership to the caller. */
+ ATTRIBUTE_UNUSED_RESULT expression_up release ();
+
+ /* Return the gdbarch that was passed to the constructor. */
-struct std_regs
+ struct gdbarch *gdbarch ()
{
- char *name;
- int regnum;
- };
+ return expout->gdbarch;
+ }
-extern struct std_regs *std_regs;
-extern unsigned num_std_regs;
+ /* Return the language that was passed to the constructor. */
-extern struct expression *expout;
-extern int expout_size;
-extern int expout_ptr;
+ const struct language_defn *language ()
+ {
+ return expout->language_defn;
+ }
-/* If this is nonzero, this block is used as the lexical context
- for symbol names. */
+ /* The size of the expression above. */
-extern struct block *expression_context_block;
+ size_t expout_size;
-/* The innermost context required by the stack and register variables
- we've encountered so far. */
-extern struct block *innermost_block;
+ /* 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;
+};
+
+/* An instance of this type is instantiated during expression parsing,
+ and passed to the appropriate parser. It holds both inputs to the
+ parser, and result. */
+
+struct parser_state : public expr_builder
+{
+ /* Constructor. LANG is the language used to parse the expression.
+ And GDBARCH is the gdbarch to use during parsing. */
+
+ parser_state (const struct language_defn *lang,
+ struct gdbarch *gdbarch,
+ const struct block *context_block,
+ CORE_ADDR context_pc,
+ int comma)
+ : expr_builder (lang, gdbarch),
+ expression_context_block (context_block),
+ expression_context_pc (context_pc),
+ comma_terminates (comma)
+ {
+ }
-/* 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;
+ DISABLE_COPY_AND_ASSIGN (parser_state);
+
+ /* If this is nonzero, this block is used as the lexical context for
+ symbol names. */
+
+ const struct block * const 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. */
+ const CORE_ADDR expression_context_pc;
+
+ /* Nonzero means stop parsing on first comma (if not within parentheses). */
+
+ int comma_terminates;
+};
+
+/* 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 innermost context required by the stack and register variables
+ we've encountered so far. This is cleared by the expression
+ parsing functions before parsing an expression, and can 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 objc_class_str
+ {
+ struct stoken stoken;
+ struct type *type;
+ int theclass;
+ };
+
/* 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_end = -1,
+ tp_pointer,
+ tp_reference,
+ tp_rvalue_reference,
+ tp_array,
+ tp_function,
+ tp_function_with_arguments,
+ tp_const,
+ tp_volatile,
+ tp_space_identifier,
+ tp_type_stack,
+ tp_kind
};
/* 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;
+ std::vector<struct type *> *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;
+};
-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 expr_builder *, enum exp_opcode);
-extern void write_exp_elt_dblcst (DOUBLEST);
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
-extern void write_exp_elt_type (struct type *);
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
-extern void write_exp_elt_intern (struct internalvar *);
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
-extern void write_exp_string (struct stoken);
+extern void write_exp_elt_type (struct expr_builder *, struct type *);
-extern void write_exp_bitstring (struct stoken);
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
-extern void write_exp_elt_block (struct block *);
+extern void write_exp_string (struct expr_builder *, struct stoken);
-extern void write_exp_msymbol (struct minimal_symbol *,
- struct type *, struct type *);
+void write_exp_string_vector (struct expr_builder *, int type,
+ struct stoken_vector *vec);
-extern void write_dollar_variable (struct stoken str);
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);
-extern struct symbol *parse_nested_classes_for_hpacc (char *, int, char **,
- int *, char **);
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);
-extern char *find_template_name_end (char *);
+extern void write_exp_elt_objfile (struct expr_builder *,
+ struct objfile *objfile);
+
+extern void write_exp_msymbol (struct expr_builder *,
+ struct bound_minimal_symbol);
+
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
+
+extern void mark_struct_expression (struct expr_builder *);
+
+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 insert_type_address_space (struct expr_builder *, 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 *follow_types (struct type *);
+extern struct type_stack *append_type_stack (struct type_stack *to,
+ struct type_stack *from);
-/* During parsing of a C expression, the pointer to the next character
- is in this variable. */
+extern void push_type_stack (struct type_stack *stack);
-extern char *lexptr;
+extern void push_typelist (std::vector<struct type *> *typelist);
-/* Tokens that refer to names do so with explicit pointer and length,
- so they can share the storage that lexptr is parsing.
+extern int dump_subexp (struct expression *, struct ui_file *, int);
- 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.
+extern int dump_subexp_body_standard (struct expression *,
+ struct ui_file *, int);
- namecopy is allocated once, guaranteed big enough, for each parsing. */
+extern void operator_length (const struct expression *, int, int *, int *);
-extern char *namecopy;
+extern void operator_length_standard (const struct expression *, int, int *,
+ int *);
-/* Current depth in parentheses within the expression. */
+extern int operator_check_standard (struct expression *exp, int pos,
+ int (*objfile_func)
+ (struct objfile *objfile, void *data),
+ void *data);
-extern int paren_depth;
+extern const char *op_name_standard (enum exp_opcode);
-/* Nonzero means stop parsing on first comma (if not within parentheses). */
+extern struct type *follow_types (struct type *);
-extern int comma_terminates;
+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 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;
\f
/* These codes indicate operator precedences for expression printing,
least tightly binding first. */
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;
};
-/* The generic method for targets to specify how their registers are
- named. The mapping can be derived from three sources:
- REGISTER_NAME; std_regs; or a target specific alias hook. */
+/* 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). */
+ 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
+ (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);
+ };
-extern int target_map_name_to_register (char *, int);
+
+/* 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);
#endif /* PARSER_DEFS_H */
+
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