/* Parser definitions for GDB.
- Copyright (C) 1986, 1989-2000, 2002, 2007-2012 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.
#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;
-extern struct expression *expout;
-extern int expout_size;
-extern int expout_ptr;
+/* A class that can be used to build a "struct expression". */
-#define parse_gdbarch (expout->gdbarch)
-#define parse_language (expout->language_defn)
+struct expr_builder
+{
+ /* Constructor. LANG is the language used to parse the expression.
+ And GDBARCH is the gdbarch to use during parsing. */
-/* If this is nonzero, this block is used as the lexical context
- for symbol names. */
+ expr_builder (const struct language_defn *lang,
+ struct gdbarch *gdbarch);
-extern struct block *expression_context_block;
+ DISABLE_COPY_AND_ASSIGN (expr_builder);
-/* 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;
+ /* 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 ();
-/* The innermost context required by the stack and register variables
- we've encountered so far. */
-extern struct block *innermost_block;
+ /* Return the gdbarch that was passed to the constructor. */
+
+ struct gdbarch *gdbarch ()
+ {
+ return expout->gdbarch;
+ }
+
+ /* Return the language that was passed to the constructor. */
+
+ const struct language_defn *language ()
+ {
+ return expout->language_defn;
+ }
+
+ /* 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;
+};
+
+/* 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)
+ {
+ }
+
+ 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. */
-/* 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;
+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;
struct stoken
{
/* Pointer to first byte of char-string or first bit of bit-string. */
- char *ptr;
+ const char *ptr;
/* Length of string in bytes for char-string or bits for bit-string. */
int length;
};
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;
};
-
/* 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_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,
+ 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;
-
-/* Helper function to initialize the expout, expout_size, expout_ptr
- trio 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 (int, const struct language_defn *,
- struct gdbarch *);
+/* The type stack is an instance of this structure. */
-/* Helper function that frees any unsed space in the expout array.
- It is generally used when the parser has just been parsed and
- created. */
-
-extern void reallocate_expout (void);
+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).
extern int prefixify_expression (struct expression *expr);
-extern void write_exp_elt_opcode (enum exp_opcode);
-
-extern void write_exp_elt_sym (struct symbol *);
+extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);
-extern void write_exp_elt_longcst (LONGEST);
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
-extern void write_exp_elt_dblcst (DOUBLEST);
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
-extern void write_exp_elt_decfloatcst (gdb_byte *);
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
-extern void write_exp_elt_type (struct type *);
+extern void write_exp_elt_type (struct expr_builder *, struct type *);
-extern void write_exp_elt_intern (struct internalvar *);
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
-extern void write_exp_string (struct stoken);
+extern void write_exp_string (struct expr_builder *, struct stoken);
-void write_exp_string_vector (int type, struct stoken_vector *vec);
+void write_exp_string_vector (struct expr_builder *, int type,
+ struct stoken_vector *vec);
-extern void write_exp_bitstring (struct stoken);
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);
-extern void write_exp_elt_block (struct block *);
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);
-extern void write_exp_elt_objfile (struct objfile *objfile);
+extern void write_exp_elt_objfile (struct expr_builder *,
+ struct objfile *objfile);
-extern void write_exp_msymbol (struct minimal_symbol *);
+extern void write_exp_msymbol (struct expr_builder *,
+ struct bound_minimal_symbol);
-extern void write_dollar_variable (struct stoken str);
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
-extern void mark_struct_expression (void);
+extern void mark_struct_expression (struct expr_builder *);
-extern char *find_template_name_end (char *);
+extern const char *find_template_name_end (const char *);
extern void start_arglist (void);
extern void push_type_int (int);
-extern void insert_type_address_space (char *);
+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_stack *append_type_stack (struct type_stack *to,
+ struct type_stack *from);
+
+extern void push_type_stack (struct type_stack *stack);
+
+extern void push_typelist (std::vector<struct type *> *typelist);
extern int dump_subexp (struct expression *, struct ui_file *, int);
(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 int parse_float (const char *p, int len, DOUBLEST *d,
- const char **suffix);
+extern void null_post_parser (expression_up *, int);
-extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
- DOUBLEST *d, struct type **t);
+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.
Currently used only for error reporting. */
-extern 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;
+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;
the number of subexpressions it takes. */
void (*operator_length) (const struct expression*, int, int*, int *);
- /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
- referenced by the single operator of EXP at position POS. Operator
- parameters are located at positive (POS + number) offsets in EXP.
- The functions should never be called with NULL TYPE or NULL OBJFILE.
- Functions should get passed an arbitrary caller supplied DATA pointer.
- If any of the functions returns non-zero value then (any other) non-zero
- value should be immediately returned to the caller. Otherwise zero
- should be returned. */
+ /* 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. */
- char *(*op_name) (enum exp_opcode);
+ /* 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
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 */
+
projects / deliverable / binutils-gdb.git / blobdiff