/* Parser definitions for GDB.
- Copyright (C) 1986, 1989, 1990, 1991 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.
-This file is part of GDB.
+ This file is part of GDB.
-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
-(at your option) any later version.
+ 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 3 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#if !defined (PARSER_DEFS_H)
#define PARSER_DEFS_H 1
-struct std_regs {
- char *name;
- int regnum;
+#include "expression.h"
+#include "symtab.h"
+
+struct block;
+struct language_defn;
+struct internalvar;
+class innermost_block_tracker;
+
+extern bool 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 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;
};
-extern struct std_regs std_regs[];
-extern unsigned num_std_regs;
+/* 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. */
+
+ 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. */
-extern struct expression *expout;
-extern int expout_size;
-extern int expout_ptr;
+ const char *lexptr;
-/* If this is nonzero, this block is used as the lexical context
- for symbol names. */
+ /* After a token has been recognized, this variable points to it.
+ Currently used only for error reporting. */
+ const char *prev_lexptr = nullptr;
-extern struct block *expression_context_block;
+ /* Number of arguments seen so far in innermost function call. */
-/* The innermost context required by the stack and register variables
- we've encountered so far. */
-extern struct block *innermost_block;
+ int arglist_len = 0;
-/* 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;
+ /* True if parsing an expression to attempt completion. */
+ int parse_completion;
-/* Number of arguments seen so far in innermost function call. */
-extern int arglist_len;
+ /* 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 */
+ /* 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;
};
-/* 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};
-/* The stack can contain either an enum type_pieces or an int. */
-union type_stack_elt {
- enum type_pieces piece;
- int int_val;
-};
-extern union type_stack_elt *type_stack;
-extern int type_stack_depth, type_stack_size;
-
-extern void write_exp_elt PARAMS ((union exp_element));
-
-extern void write_exp_elt_opcode PARAMS ((enum exp_opcode));
-
-extern void write_exp_elt_sym PARAMS ((struct symbol *));
-
-extern void write_exp_elt_longcst PARAMS ((LONGEST));
+struct objc_class_str
+ {
+ struct stoken stoken;
+ struct type *type;
+ int theclass;
+ };
-extern void write_exp_elt_dblcst PARAMS ((double));
+/* 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_type PARAMS ((struct type *));
+extern int prefixify_expression (struct expression *expr,
+ int last_struct = -1);
-extern void write_exp_elt_intern PARAMS ((struct internalvar *));
+extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);
-extern void write_exp_string PARAMS ((struct stoken));
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
-extern void write_exp_bitstring PARAMS ((struct stoken));
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
-extern void write_exp_elt_block PARAMS ((struct block *));
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
-extern void write_exp_msymbol PARAMS ((struct minimal_symbol *,
- struct type *, struct type *));
+extern void write_exp_elt_type (struct expr_builder *, struct type *);
-extern void
-start_arglist PARAMS ((void));
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
-extern int
-end_arglist PARAMS ((void));
+extern void write_exp_string (struct expr_builder *, struct stoken);
-extern char *
-copy_name PARAMS ((struct stoken));
+void write_exp_string_vector (struct expr_builder *, int type,
+ struct stoken_vector *vec);
-extern void
-push_type PARAMS ((enum type_pieces));
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);
-extern void
-push_type_int PARAMS ((int));
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);
-extern enum type_pieces
-pop_type PARAMS ((void));
+extern void write_exp_elt_objfile (struct expr_builder *,
+ struct objfile *objfile);
-extern int
-pop_type_int PARAMS ((void));
+extern void write_exp_msymbol (struct expr_builder *,
+ struct bound_minimal_symbol);
-extern struct type *follow_types PARAMS ((struct type *));
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
-/* During parsing of a C expression, the pointer to the next character
- is in this variable. */
+extern const char *find_template_name_end (const char *);
-extern char *lexptr;
+extern std::string copy_name (struct stoken);
-/* 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 void null_post_parser (expression_up *, int, int,
+ innermost_block_tracker *);
-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. */
they are used as the "surrounding precedence" to force
various kinds of things to be parenthesized. */
enum precedence
-{ PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
- PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
- PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
- PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };
+ {
+ PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
+ PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
+ PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
+ PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
+ };
/* Table mapping opcodes into strings for printing operators
and precedences of the operators. */
struct op_print
-{
- char *string;
- enum exp_opcode opcode;
- /* Precedence of operator. These values are used only by comparisons. */
- enum precedence precedence;
- int right_assoc;
-};
+ {
+ 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. */
+ int right_assoc;
+ };
+
+/* 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);
+ };
+
+
+/* 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);
+
+#endif /* PARSER_DEFS_H */
-#endif /* PARSER_DEFS_H */
projects / deliverable / binutils-gdb.git / blobdiff