/* Definitions for values of C expressions, for GDB.
- Copyright (C) 1986-2018 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "frame.h" /* For struct frame_id. */
#include "extension.h"
+#include "gdbsupport/gdb_ref_ptr.h"
struct block;
struct expression;
struct value;
+/* Increase VAL's reference count. */
+
+extern void value_incref (struct value *val);
+
+/* Decrease VAL's reference count. When the reference count drops to
+ 0, VAL will be freed. */
+
+extern void value_decref (struct value *val);
+
+/* A policy class to interface gdb::ref_ptr with struct value. */
+
+struct value_ref_policy
+{
+ static void incref (struct value *ptr)
+ {
+ value_incref (ptr);
+ }
+
+ static void decref (struct value *ptr)
+ {
+ value_decref (ptr);
+ }
+};
+
+/* A gdb:;ref_ptr pointer to a struct value. */
+
+typedef gdb::ref_ptr<struct value, value_ref_policy> value_ref_ptr;
+
/* Values are stored in a chain, so that they can be deleted easily
over calls to the inferior. Values assigned to internal variables,
put into the value history or exposed to Python are taken off this
extern struct value *value_from_longest (struct type *type, LONGEST num);
extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
+extern struct value *value_from_host_double (struct type *type, double d);
extern struct value *value_from_history_ref (const char *, const char **);
extern struct value *value_from_component (struct value *, struct type *,
LONGEST);
extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
-extern int value_must_coerce_to_target (struct value *arg1);
+/* Return true if VAL does not live in target memory, but should in order
+ to operate on it. Otherwise return false. */
+
+extern bool value_must_coerce_to_target (struct value *arg1);
extern struct value *value_coerce_to_target (struct value *arg1);
enum oload_search_type { NON_METHOD, METHOD, BOTH };
-extern int find_overload_match (struct value **args, int nargs,
+extern int find_overload_match (gdb::array_view<value *> args,
const char *name,
enum oload_search_type method,
struct value **objp, struct symbol *fsym,
extern void fetch_subexp_value (struct expression *exp, int *pc,
struct value **valp, struct value **resultp,
- struct value **val_chain,
+ std::vector<value_ref_ptr> *val_chain,
int preserve_errors);
extern const char *extract_field_op (struct expression *exp, int *subexp);
extern int destructor_name_p (const char *name, struct type *type);
-extern void value_incref (struct value *val);
-
-extern void value_free (struct value *val);
-
-/* A free policy class to interface std::unique_ptr with
- value_free. */
-
-struct value_deleter
-{
- void operator() (struct value *value) const
- {
- value_free (value);
- }
-};
-
-/* A unique pointer to a struct value. */
-
-typedef std::unique_ptr<struct value, value_deleter> gdb_value_up;
-
-extern void free_all_values (void);
-
-extern void free_value_chain (struct value *v);
-
-extern void release_value (struct value *val);
-
-extern void release_value_or_incref (struct value *val);
+extern value_ref_ptr release_value (struct value *val);
extern int record_latest_value (struct value *val);
struct ui_file *stream, int format,
enum val_prettyformat pretty);
-extern struct value *value_release_to_mark (const struct value *mark);
+/* Release values from the value chain and return them. Values
+ created after MARK are released. If MARK is nullptr, or if MARK is
+ not found on the value chain, then all values are released. Values
+ are returned in reverse order of creation; that is, newest
+ first. */
+
+extern std::vector<value_ref_ptr> value_release_to_mark
+ (const struct value *mark);
extern void val_print (struct type *type,
LONGEST embedded_offset, CORE_ADDR address,
extern struct value *value_allocate_space_in_inferior (int);
extern struct value *value_subscripted_rvalue (struct value *array,
- LONGEST index, int lowerbound);
+ LONGEST index,
+ LONGEST lowerbound);
/* User function handler. */
extern struct value *value_from_xmethod (xmethod_worker_up &&worker);
extern struct type *result_type_of_xmethod (struct value *method,
- int argc, struct value **argv);
+ gdb::array_view<value *> argv);
extern struct value *call_xmethod (struct value *method,
- int argc, struct value **argv);
+ gdb::array_view<value *> argv);
+
+/* Given a discriminated union type and some corresponding value
+ contents, this will return the field index of the currently active
+ variant. This will throw an exception if no active variant can be
+ found. */
+
+extern int value_union_variant (struct type *union_type,
+ const gdb_byte *contents);
+
+/* Destroy the values currently allocated. This is called when GDB is
+ exiting (e.g., on quit_force). */
+extern void finalize_values ();
#endif /* !defined (VALUE_H) */