/* Parser definitions for GDB.
- Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2002, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 1986-2020 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 "expression.h"
+#include "symtab.h"
struct block;
+struct language_defn;
+struct internalvar;
+class innermost_block_tracker;
-extern int parser_debug;
+extern bool 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. */
-/* 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;
+ 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;
+};
+
+/* This is used for expression completion. */
+
+struct expr_completion_state
+{
+ /* The index of the last struct expression directly before a '.' or
+ '->'. This is set when parsing and is only used when completing a
+ field name. It is -1 if no dereference operation was found. */
+ int expout_last_struct = -1;
+
+ /* If we are completing a tagged type name, this will be nonzero. */
+ enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF;
+
+ /* The token for tagged type name completion. */
+ gdb::unique_xmalloc_ptr<char> expout_completion_name;
+};
+
+/* 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,
+ const char *input,
+ int completion,
+ innermost_block_tracker *tracker)
+ : expr_builder (lang, gdbarch),
+ expression_context_block (context_block),
+ expression_context_pc (context_pc),
+ comma_terminates (comma),
+ lexptr (input),
+ parse_completion (completion),
+ block_tracker (tracker)
+ {
+ }
+
+ DISABLE_COPY_AND_ASSIGN (parser_state);
+
+ /* Begin counting arguments for a function call,
+ saving the data about any containing call. */
+
+ void start_arglist ()
+ {
+ m_funcall_chain.push_back (arglist_len);
+ arglist_len = 0;
+ }
+
+ /* Return the number of arguments in a function call just terminated,
+ and restore the data for the containing function call. */
+
+ int end_arglist ()
+ {
+ int val = arglist_len;
+ arglist_len = m_funcall_chain.back ();
+ m_funcall_chain.pop_back ();
+ return val;
+ }
+
+ /* Mark the current index as the starting location of a structure
+ expression. This is used when completing on field names. */
+
+ void mark_struct_expression ();
+
+ /* Indicate that the current parser invocation is completing a tag.
+ TAG is the type code of the tag, and PTR and LENGTH represent the
+ start of the tag name. */
+
+ void mark_completion_tag (enum type_code tag, const char *ptr, int length);
+
+
+ /* If this is nonzero, this block is used as the lexical context for
+ symbol names. */
-/* Number of arguments seen so far in innermost function call. */
-extern int arglist_len;
+ 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;
+
+ /* During parsing of a C expression, the pointer to the next character
+ is in this variable. */
+
+ const char *lexptr;
+
+ /* After a token has been recognized, this variable points to it.
+ Currently used only for error reporting. */
+ const char *prev_lexptr = nullptr;
+
+ /* Number of arguments seen so far in innermost function call. */
+
+ int arglist_len = 0;
+
+ /* True if parsing an expression to attempt completion. */
+ int parse_completion;
+
+ /* Completion state is updated here. */
+ expr_completion_state m_completion_state;
+
+ /* The innermost block tracker. */
+ innermost_block_tracker *block_tracker;
+
+private:
+
+ /* Data structure for saving values of arglist_len for function calls whose
+ arguments contain other function calls. */
+
+ std::vector<int> m_funcall_chain;
+};
+
+/* When parsing expressions we track the innermost block that was
+ referenced. */
+
+class innermost_block_tracker
+{
+public:
+ innermost_block_tracker (innermost_block_tracker_types types
+ = INNERMOST_BLOCK_FOR_SYMBOLS)
+ : m_types (types),
+ m_innermost_block (NULL)
+ { /* Nothing. */ }
+
+ /* 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;
+};
/* 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 */
- char *ptr;
- /* Length of string in bytes for char-string or bits for 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;
};
{
/* A language-specific type field. */
int type;
- /* 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. */
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 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;
- };
-
-
-/* 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_const,
- tp_volatile,
- tp_space_identifier
- };
-/* The stack can contain either an enum type_pieces or an int. */
-union type_stack_elt
- {
- enum type_pieces piece;
- int int_val;
+ int theclass;
};
-extern union type_stack_elt *type_stack;
-extern int type_stack_depth, type_stack_size;
-
-extern void write_exp_elt (union exp_element);
-
-extern void write_exp_elt_opcode (enum exp_opcode);
-
-extern void write_exp_elt_sym (struct symbol *);
-
-extern void write_exp_elt_longcst (LONGEST);
-
-extern void write_exp_elt_dblcst (DOUBLEST);
-
-extern void write_exp_elt_decfloatcst (gdb_byte *);
-extern void write_exp_elt_type (struct type *);
+/* 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 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 LAST_STRUCT. */
-extern void write_exp_elt_intern (struct internalvar *);
+extern int prefixify_expression (struct expression *expr,
+ int last_struct = -1);
-extern void write_exp_string (struct stoken);
+extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);
-void write_exp_string_vector (int type, struct stoken_vector *vec);
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
-extern void write_exp_bitstring (struct stoken);
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
-extern void write_exp_elt_block (struct block *);
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
-extern void write_exp_elt_objfile (struct objfile *objfile);
+extern void write_exp_elt_type (struct expr_builder *, struct type *);
-extern void write_exp_msymbol (struct minimal_symbol *);
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
-extern void write_dollar_variable (struct stoken str);
+extern void write_exp_string (struct expr_builder *, struct stoken);
-extern void mark_struct_expression (void);
+void write_exp_string_vector (struct expr_builder *, int type,
+ struct stoken_vector *vec);
-extern char *find_template_name_end (char *);
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);
-extern void start_arglist (void);
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);
-extern int end_arglist (void);
+extern void write_exp_elt_objfile (struct expr_builder *,
+ struct objfile *objfile);
-extern char *copy_name (struct stoken);
+extern void write_exp_msymbol (struct expr_builder *,
+ struct bound_minimal_symbol);
-extern void push_type (enum type_pieces);
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
-extern void push_type_int (int);
+extern const char *find_template_name_end (const char *);
-extern void push_type_address_space (char *);
-
-extern enum type_pieces pop_type (void);
-
-extern int pop_type_int (void);
-
-extern int length_of_subexp (struct expression *, int);
+extern std::string copy_name (struct stoken);
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 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 char *lexptr;
+extern const char *op_name_standard (enum exp_opcode);
-/* After a token has been recognized, this variable points to it.
- Currently used only for error reporting. */
-extern char *prev_lexptr;
+extern void null_post_parser (expression_up *, int, int,
+ innermost_block_tracker *);
-/* 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;
-
-/* 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 bool parse_float (const char *p, int len,
+ const struct type *type, gdb_byte *data);
\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 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);
#endif /* PARSER_DEFS_H */
+
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