/* Parser definitions for GDB.
- Copyright (C) 1986-2021 Free Software Foundation, Inc.
+ Copyright (C) 1986-2024 Free Software Foundation, Inc.
Modified from expread.y by the Department of Computer Science at the
State University of New York at Buffalo.
struct internalvar;
class innermost_block_tracker;
-extern bool parser_debug;
-
/* A class that can be used to build a "struct expression". */
struct expr_builder
And GDBARCH is the gdbarch to use during parsing. */
expr_builder (const struct language_defn *lang,
- struct gdbarch *gdbarch);
+ struct gdbarch *gdbarch)
+ : expout (new expression (lang, 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 ();
+ ATTRIBUTE_UNUSED_RESULT expression_up release ()
+ {
+ return std::move (expout);
+ }
/* Return the gdbarch that was passed to the constructor. */
expout->op = std::move (op);
}
- /* 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. */
+/* Complete an expression that references a field, like "x->y". */
-struct expr_completion_state
+struct expr_complete_structop : public expr_completion_base
{
- /* 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;
+ explicit expr_complete_structop (expr::structop_base_operation *op)
+ : m_op (op)
+ {
+ }
+
+ bool complete (struct expression *exp,
+ completion_tracker &tracker) override
+ {
+ return m_op->complete (exp, tracker);
+ }
+
+private:
/* The last struct expression directly before a '.' or '->'. This
is set when parsing and is only used when completing a field
name. It is nullptr if no dereference operation was found. */
- expr::structop_base_operation *expout_last_op = nullptr;
+ expr::structop_base_operation *m_op = nullptr;
+};
+
+/* Complete a tag name in an expression. This is used for something
+ like "enum abc<TAB>". */
+
+struct expr_complete_tag : public expr_completion_base
+{
+ expr_complete_tag (enum type_code code,
+ gdb::unique_xmalloc_ptr<char> name)
+ : m_code (code),
+ m_name (std::move (name))
+ {
+ /* Parsers should enforce this statically. */
+ gdb_assert (code == TYPE_CODE_ENUM
+ || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_STRUCT);
+ }
- /* If we are completing a tagged type name, this will be nonzero. */
- enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF;
+ bool complete (struct expression *exp,
+ completion_tracker &tracker) override;
+
+private:
+
+ /* The kind of tag to complete. */
+ enum type_code m_code;
/* The token for tagged type name completion. */
- gdb::unique_xmalloc_ptr<char> expout_completion_name;
+ gdb::unique_xmalloc_ptr<char> m_name;
};
/* An instance of this type is instantiated during expression parsing,
struct gdbarch *gdbarch,
const struct block *context_block,
CORE_ADDR context_pc,
- int comma,
+ parser_flags flags,
const char *input,
- int completion,
- innermost_block_tracker *tracker,
- bool void_p)
+ bool 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),
+ start_of_input (input),
block_tracker (tracker),
- void_context_p (void_p)
+ comma_terminates ((flags & PARSER_COMMA_TERMINATES) != 0),
+ parse_completion (completion),
+ void_context_p ((flags & PARSER_VOID_CONTEXT) != 0),
+ debug ((flags & PARSER_DEBUG) != 0)
{
}
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 ();
-
/* Mark the given operation as the starting location of a structure
expression. This is used when completing on field names. */
void mark_completion_tag (enum type_code tag, const char *ptr, int length);
+ /* Mark for completion, using an arbitrary completer. */
+
+ void mark_completion (std::unique_ptr<expr_completion_base> completer)
+ {
+ gdb_assert (m_completion_state == nullptr);
+ m_completion_state = std::move (completer);
+ }
+
+ /* Push an operation on the stack. */
+ void push (expr::operation_up &&op)
+ {
+ m_operations.push_back (std::move (op));
+ }
+
+ /* Create a new operation and push it on the stack. */
+ template<typename T, typename... Arg>
+ void push_new (Arg... args)
+ {
+ m_operations.emplace_back (new T (std::forward<Arg> (args)...));
+ }
+
+ /* Push a new C string operation. */
+ void push_c_string (int, struct stoken_vector *vec);
+
+ /* Push a symbol reference. If SYM is nullptr, look for a minimal
+ symbol. */
+ void push_symbol (const char *name, block_symbol sym);
+
+ /* Push a reference to $mumble. This may result in a convenience
+ variable, a history reference, or a register. */
+ void push_dollar (struct stoken str);
+
+ /* Pop an operation from the stack. */
+ expr::operation_up pop ()
+ {
+ expr::operation_up result = std::move (m_operations.back ());
+ m_operations.pop_back ();
+ return result;
+ }
+
+ /* Pop N elements from the stack and return a vector. */
+ std::vector<expr::operation_up> pop_vector (int n)
+ {
+ std::vector<expr::operation_up> result (n);
+ for (int i = 1; i <= n; ++i)
+ result[n - i] = pop ();
+ return result;
+ }
+
+ /* A helper that pops an operation, wraps it in some other
+ operation, and pushes it again. */
+ template<typename T>
+ void wrap ()
+ {
+ using namespace expr;
+ operation_up v = ::expr::make_operation<T> (pop ());
+ push (std::move (v));
+ }
+
+ /* A helper that pops two operations, wraps them in some other
+ operation, and pushes the result. */
+ template<typename T>
+ void wrap2 ()
+ {
+ expr::operation_up rhs = pop ();
+ expr::operation_up lhs = pop ();
+ push (expr::make_operation<T> (std::move (lhs), std::move (rhs)));
+ }
+
+ /* Function called from the various parsers' yyerror functions to throw
+ an error. The error will include a message identifying the location
+ of the error within the current expression. */
+ void parse_error (const char *msg);
/* If this is nonzero, this block is used as the lexical context for
symbol names. */
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. */
Currently used only for error reporting. */
const char *prev_lexptr = nullptr;
+ /* A pointer to the start of the full input, used for error reporting. */
+ const char *start_of_input = 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;
+ std::unique_ptr<expr_completion_base> m_completion_state;
/* The innermost block tracker. */
innermost_block_tracker *block_tracker;
+ /* Nonzero means stop parsing on first comma (if not within parentheses). */
+ bool comma_terminates;
+
+ /* True if parsing an expression to attempt completion. */
+ bool parse_completion;
+
/* True if no value is expected from the expression. */
bool void_context_p;
+ /* True if parser debugging should be enabled. */
+ bool debug;
+
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;
+ /* Stack of operations. */
+ std::vector<expr::operation_up> m_operations;
};
/* A string token, either a char-string or bit-string. Char-strings are
int theclass;
};
-/* 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 int prefixify_expression (struct expression *expr,
- int last_struct = -1);
-
-extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);
-
-extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
-
-extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
-
-extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
-
-extern void write_exp_elt_type (struct expr_builder *, struct type *);
-
-extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
-
-extern void write_exp_string (struct expr_builder *, struct stoken);
-
-void write_exp_string_vector (struct expr_builder *, int type,
- struct stoken_vector *vec);
-
-extern void write_exp_bitstring (struct expr_builder *, struct stoken);
-
-extern void write_exp_elt_block (struct expr_builder *, const struct block *);
-
-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);
-
-/* Write a reference to a symbol to the expression being built in PS.
- NAME is the name of the symbol to write; SYM is the symbol. If SYM
- is nullptr (meaning the 'symbol' member), a minimal symbol will be
- searched for and used if available. Throws an exception if SYM is
- nullptr and no minimal symbol can be found. */
-
-extern void write_exp_symbol_reference (struct parser_state *ps,
- const char *name,
- struct block_symbol sym);
-
extern const char *find_template_name_end (const char *);
extern std::string copy_name (struct stoken);
-extern int dump_subexp (struct expression *, struct ui_file *, int);
-
-extern int dump_subexp_body_standard (struct expression *,
- struct ui_file *, int);
-
-/* Dump (to STREAM) a function call like expression at position ELT in the
- expression array EXP. Return a new value for ELT just after the
- function call expression. */
-
-extern int dump_subexp_body_funcall (struct expression *exp,
- struct ui_file *stream, int elt);
-
-extern void operator_length (const struct expression *, int, int *, int *);
-
-extern void operator_length_standard (const 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 bool parse_float (const char *p, int len,
const struct type *type, gdb_byte *data);
+extern bool fits_in_type (int n_sign, ULONGEST n, int type_bits,
+ bool type_signed_p);
+extern bool fits_in_type (int n_sign, const gdb_mpz &n, int type_bits,
+ bool type_signed_p);
\f
-/* These codes indicate operator precedences for expression printing,
- least tightly binding first. */
-/* Adding 1 to a precedence value is done for binary operators,
- on the operand which is more tightly bound, so that operators
- of equal precedence within that operand will get parentheses. */
-/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
- 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_BUILTIN_FUNCTION
- };
-
-/* Table mapping opcodes into strings for printing operators
- and precedences of the operators. */
-
-struct op_print
- {
- 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);
-
- /* 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);
-
-/* Print a function call like expression to STREAM. This is called as a
- helper function by which point the expression node identifying this as a
- function call has already been stripped off and POS should point to the
- number of function call arguments. EXP is the object containing the
- list of expression elements. */
-
-extern void print_subexp_funcall (struct expression *exp, int *pos,
- struct ui_file *stream);
/* 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 */
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