/* Definitions for values of C expressions, for GDB.
- Copyright (C) 1986-2017 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
#if !defined (VALUE_H)
#define VALUE_H 1
-#include "doublest.h"
#include "frame.h" /* For struct frame_id. */
+#include "extension.h"
+#include "gdbsupport/gdb_ref_ptr.h"
struct block;
struct expression;
struct ui_file;
struct language_defn;
struct value_print_options;
-struct xmethod_worker;
/* Values can be partially 'optimized out' and/or 'unavailable'.
These are distinct states and have different string representations
value_contents_eq for more info.
*/
+extern bool overload_resolution;
+
/* The structure which defines the type of a value. It should never
be possible for a program lval value to survive over a call to the
inferior (i.e. to be put into the history list or an internal
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
then:
- value_contents_eq(val, 0, val, 8, 6) => 1
- value_contents_eq(val, 0, val, 4, 4) => 0
- value_contents_eq(val, 0, val, 8, 8) => 0
- value_contents_eq(val, 4, val, 12, 2) => 1
- value_contents_eq(val, 4, val, 12, 4) => 0
- value_contents_eq(val, 3, val, 4, 4) => 0
+ value_contents_eq(val, 0, val, 8, 6) => true
+ value_contents_eq(val, 0, val, 4, 4) => false
+ value_contents_eq(val, 0, val, 8, 8) => false
+ value_contents_eq(val, 4, val, 12, 2) => true
+ value_contents_eq(val, 4, val, 12, 4) => true
+ value_contents_eq(val, 3, val, 4, 4) => true
If 'x's represent an unavailable byte, 'o' represents an optimized
out byte, in a value with length 8:
then:
- value_contents_eq(val, 0, val, 2, 2) => 1
- value_contents_eq(val, 4, val, 6, 2) => 1
- value_contents_eq(val, 0, val, 4, 4) => 0
+ value_contents_eq(val, 0, val, 2, 2) => true
+ value_contents_eq(val, 4, val, 6, 2) => true
+ value_contents_eq(val, 0, val, 4, 4) => true
We only know whether a value chunk is unavailable or optimized out
if we've tried to read it. As this routine is used by printing
after the inferior is gone, it works with const values. Therefore,
this routine must not be called with lazy values. */
-extern int value_contents_eq (const struct value *val1, LONGEST offset1,
- const struct value *val2, LONGEST offset2,
- LONGEST length);
+extern bool value_contents_eq (const struct value *val1, LONGEST offset1,
+ const struct value *val2, LONGEST offset2,
+ LONGEST length);
/* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
which is (or will be copied to) VAL's contents buffer offset by
struct gdbarch *, CORE_ADDR,
struct ui_file *, int);
+/* Returns true if VAL is of floating-point type. In addition,
+ throws an error if the value is an invalid floating-point value. */
+extern bool is_floating_value (struct value *val);
+
extern LONGEST value_as_long (struct value *val);
-extern DOUBLEST value_as_double (struct value *val);
extern CORE_ADDR value_as_address (struct value *val);
extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
-extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
- int *invp);
extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
extern LONGEST unpack_field_as_long (struct type *type,
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_double (struct type *type, DOUBLEST num);
-extern struct value *value_from_decfloat (struct type *type,
- const gdb_byte *decbytes);
+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 struct value *evaluate_subexpression_type (struct expression *exp,
int subexp);
+extern value *evaluate_var_value (enum noside noside, const block *blk,
+ symbol *var);
+
+extern value *evaluate_var_msym_value (enum noside noside,
+ struct objfile *objfile,
+ minimal_symbol *msymbol);
+
+extern value *eval_skip_value (expression *exp);
+
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 char *extract_field_op (struct expression *exp, int *subexp);
+extern const char *extract_field_op (struct expression *exp, int *subexp);
extern struct value *evaluate_subexp_with_coercion (struct expression *,
int *, enum noside);
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);
extern void print_floating (const gdb_byte *valaddr, struct type *type,
struct ui_file *stream);
-extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
- struct ui_file *stream);
-
extern void value_print (struct value *val, struct ui_file *stream,
const struct value_print_options *options);
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. */
char *value_internal_function_name (struct value *);
-extern struct value *value_of_xmethod (struct xmethod_worker *);
+/* Build a value wrapping and representing WORKER. The value takes ownership
+ of the xmethod_worker object. */
+
+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) */
projects / binutils.git / blobdiff