/* Definitions for values of C expressions, for GDB.
- Copyright (C) 1986-2020 Free Software Foundation, Inc.
+ Copyright (C) 1986-2023 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"
+#include "gmp-utils.h"
struct block;
struct expression;
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
- variable). */
+/* Defines an [OFFSET, OFFSET + LENGTH) range. */
-struct value;
+struct range
+{
+ /* Lowest offset in the range. */
+ LONGEST offset;
+
+ /* Length of the range. */
+ ULONGEST length;
+
+ /* Returns true if THIS is strictly less than OTHER, useful for
+ searching. We keep ranges sorted by offset and coalesce
+ overlapping and contiguous ranges, so this just compares the
+ starting offset. */
+
+ bool operator< (const range &other) const
+ {
+ return offset < other.offset;
+ }
+
+ /* Returns true if THIS is equal to OTHER. */
+ bool operator== (const range &other) const
+ {
+ return offset == other.offset && length == other.length;
+ }
+};
/* Increase VAL's reference count. */
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
- list. */
+/* Note that the fields in this structure are arranged to save a bit
+ of memory. */
+
+struct value
+{
+private:
+
+ /* Values can only be created via "static constructors". */
+ explicit value (struct type *type_)
+ : m_modifiable (1),
+ m_lazy (1),
+ m_initialized (1),
+ m_stack (0),
+ m_is_zero (false),
+ m_in_history (false),
+ m_type (type_),
+ m_enclosing_type (type_)
+ {
+ }
+
+public:
+
+ /* Allocate a lazy value for type TYPE. Its actual content is
+ "lazily" allocated too: the content field of the return value is
+ NULL; it will be allocated when it is fetched from the target. */
+ static struct value *allocate_lazy (struct type *type);
+
+ /* Allocate a value and its contents for type TYPE. */
+ static struct value *allocate (struct type *type);
+
+ /* Create a computed lvalue, with type TYPE, function pointers
+ FUNCS, and closure CLOSURE. */
+ static struct value *allocate_computed (struct type *type,
+ const struct lval_funcs *funcs,
+ void *closure);
+
+ ~value ();
+
+ DISABLE_COPY_AND_ASSIGN (value);
+
+ /* Type of the value. */
+ struct type *type () const
+ { return m_type; }
+
+ /* This is being used to change the type of an existing value, that
+ code should instead be creating a new value with the changed type
+ (but possibly shared content). */
+ void deprecated_set_type (struct type *type)
+ { m_type = type; }
+
+ /* Return the gdbarch associated with the value. */
+ struct gdbarch *arch () const;
+
+ /* Only used for bitfields; number of bits contained in them. */
+ LONGEST bitsize () const
+ { return m_bitsize; }
+
+ void set_bitsize (LONGEST bit)
+ { m_bitsize = bit; }
+
+ /* Only used for bitfields; position of start of field. For
+ little-endian targets, it is the position of the LSB. For
+ big-endian targets, it is the position of the MSB. */
+ LONGEST bitpos () const
+ { return m_bitpos; }
+
+ void set_bitpos (LONGEST bit)
+ { m_bitpos = bit; }
+
+ /* Only used for bitfields; the containing value. This allows a
+ single read from the target when displaying multiple
+ bitfields. */
+ value *parent () const
+ { return m_parent.get (); }
+
+ void set_parent (struct value *parent)
+ { m_parent = value_ref_ptr::new_reference (parent); }
+
+ /* Describes offset of a value within lval of a structure in bytes.
+ If lval == lval_memory, this is an offset to the address. If
+ lval == lval_register, this is a further offset from
+ location.address within the registers structure. Note also the
+ member embedded_offset below. */
+ LONGEST offset () const
+ { return m_offset; }
+
+ void set_offset (LONGEST offset)
+ { m_offset = offset; }
+
+ /* The comment from "struct value" reads: ``Is it modifiable? Only
+ relevant if lval != not_lval.''. Shouldn't the value instead be
+ not_lval and be done with it? */
+ int deprecated_modifiable () const
+ { return m_modifiable; }
+
+ LONGEST pointed_to_offset () const
+ { return m_pointed_to_offset; }
+
+ void set_pointed_to_offset (LONGEST val)
+ { m_pointed_to_offset = val; }
+
+ LONGEST embedded_offset () const
+ { return m_embedded_offset; }
+
+ void set_embedded_offset (LONGEST val)
+ { m_embedded_offset = val; }
+
+ /* If zero, contents of this value are in the contents field. If
+ nonzero, contents are in inferior. If the lval field is lval_memory,
+ the contents are in inferior memory at location.address plus offset.
+ The lval field may also be lval_register.
+
+ WARNING: This field is used by the code which handles watchpoints
+ (see breakpoint.c) to decide whether a particular value can be
+ watched by hardware watchpoints. If the lazy flag is set for some
+ member of a value chain, it is assumed that this member of the
+ chain doesn't need to be watched as part of watching the value
+ itself. This is how GDB avoids watching the entire struct or array
+ when the user wants to watch a single struct member or array
+ element. If you ever change the way lazy flag is set and reset, be
+ sure to consider this use as well! */
+
+ int lazy () const
+ { return m_lazy; }
+
+ void set_lazy (int val)
+ { m_lazy = val; }
+
+
+ /* If a value represents a C++ object, then the `type' field gives the
+ object's compile-time type. If the object actually belongs to some
+ class derived from `type', perhaps with other base classes and
+ additional members, then `type' is just a subobject of the real
+ thing, and the full object is probably larger than `type' would
+ suggest.
+
+ If `type' is a dynamic class (i.e. one with a vtable), then GDB can
+ actually determine the object's run-time type by looking at the
+ run-time type information in the vtable. When this information is
+ available, we may elect to read in the entire object, for several
+ reasons:
+
+ - When printing the value, the user would probably rather see the
+ full object, not just the limited portion apparent from the
+ compile-time type.
+
+ - If `type' has virtual base classes, then even printing `type'
+ alone may require reaching outside the `type' portion of the
+ object to wherever the virtual base class has been stored.
+
+ When we store the entire object, `enclosing_type' is the run-time
+ type -- the complete object -- and `embedded_offset' is the offset
+ of `type' within that larger type, in bytes. The value_contents()
+ macro takes `embedded_offset' into account, so most GDB code
+ continues to see the `type' portion of the value, just as the
+ inferior would.
+
+ If `type' is a pointer to an object, then `enclosing_type' is a
+ pointer to the object's run-time type, and `pointed_to_offset' is
+ the offset in bytes from the full object to the pointed-to object
+ -- that is, the value `embedded_offset' would have if we followed
+ the pointer and fetched the complete object. (I don't really see
+ the point. Why not just determine the run-time type when you
+ indirect, and avoid the special case? The contents don't matter
+ until you indirect anyway.)
+
+ If we're not doing anything fancy, `enclosing_type' is equal to
+ `type', and `embedded_offset' is zero, so everything works
+ normally. */
+
+ struct type *enclosing_type () const
+ { return m_enclosing_type; }
+
+ void set_enclosing_type (struct type *new_type);
+
+ int stack () const
+ { return m_stack; }
+
+ void set_stack (int val)
+ { m_stack = val; }
+
+ /* If this value is lval_computed, return its lval_funcs
+ structure. */
+ const struct lval_funcs *computed_funcs () const;
-struct value *value_next (const struct value *);
+ /* If this value is lval_computed, return its closure. The meaning
+ of the returned value depends on the functions this value
+ uses. */
+ void *computed_closure () const;
-/* Type of the value. */
+ enum lval_type *deprecated_lval_hack ()
+ { return &m_lval; }
-extern struct type *value_type (const struct value *);
+ enum lval_type lval () const
+ { return m_lval; }
-/* Return the gdbarch associated with the value. */
+ /* Set or return field indicating whether a variable is initialized or
+ not, based on debugging information supplied by the compiler.
+ 1 = initialized; 0 = uninitialized. */
+ int initialized () const
+ { return m_initialized; }
-extern struct gdbarch *get_value_arch (const struct value *value);
+ void set_initialized (int value)
+ { m_initialized = value; }
-/* This is being used to change the type of an existing value, that
- code should instead be creating a new value with the changed type
- (but possibly shared content). */
+ /* If lval == lval_memory, return the address in the inferior. If
+ lval == lval_register, return the byte offset into the registers
+ structure. Otherwise, return 0. The returned address
+ includes the offset, if any. */
+ CORE_ADDR address () const;
-extern void deprecated_set_value_type (struct value *value,
- struct type *type);
+ /* Like address, except the result does not include value's
+ offset. */
+ CORE_ADDR raw_address () const;
-/* Only used for bitfields; number of bits contained in them. */
+ /* Set the address of a value. */
+ void set_address (CORE_ADDR);
-extern LONGEST value_bitsize (const struct value *);
-extern void set_value_bitsize (struct value *, LONGEST bit);
+ struct internalvar **deprecated_internalvar_hack ()
+ { return &m_location.internalvar; }
-/* Only used for bitfields; position of start of field. For
- little-endian targets, it is the position of the LSB. For
- big-endian targets, it is the position of the MSB. */
+ struct frame_id *deprecated_next_frame_id_hack ();
-extern LONGEST value_bitpos (const struct value *);
-extern void set_value_bitpos (struct value *, LONGEST bit);
+ int *deprecated_regnum_hack ();
-/* Only used for bitfields; the containing value. This allows a
- single read from the target when displaying multiple
- bitfields. */
-struct value *value_parent (const struct value *);
-extern void set_value_parent (struct value *value, struct value *parent);
+ /* Type of value; either not an lval, or one of the various
+ different possible kinds of lval. */
+ enum lval_type m_lval = not_lval;
-/* Describes offset of a value within lval of a structure in bytes.
- If lval == lval_memory, this is an offset to the address. If lval
- == lval_register, this is a further offset from location.address
- within the registers structure. Note also the member
- embedded_offset below. */
+ /* Is it modifiable? Only relevant if lval != not_lval. */
+ unsigned int m_modifiable : 1;
-extern LONGEST value_offset (const struct value *);
-extern void set_value_offset (struct value *, LONGEST offset);
+ /* If zero, contents of this value are in the contents field. If
+ nonzero, contents are in inferior. If the lval field is lval_memory,
+ the contents are in inferior memory at location.address plus offset.
+ The lval field may also be lval_register.
-/* The comment from "struct value" reads: ``Is it modifiable? Only
- relevant if lval != not_lval.''. Shouldn't the value instead be
- not_lval and be done with it? */
+ WARNING: This field is used by the code which handles watchpoints
+ (see breakpoint.c) to decide whether a particular value can be
+ watched by hardware watchpoints. If the lazy flag is set for
+ some member of a value chain, it is assumed that this member of
+ the chain doesn't need to be watched as part of watching the
+ value itself. This is how GDB avoids watching the entire struct
+ or array when the user wants to watch a single struct member or
+ array element. If you ever change the way lazy flag is set and
+ reset, be sure to consider this use as well! */
+ unsigned int m_lazy : 1;
-extern int deprecated_value_modifiable (const struct value *value);
+ /* If value is a variable, is it initialized or not. */
+ unsigned int m_initialized : 1;
-/* If a value represents a C++ object, then the `type' field gives the
- object's compile-time type. If the object actually belongs to some
- class derived from `type', perhaps with other base classes and
- additional members, then `type' is just a subobject of the real
- thing, and the full object is probably larger than `type' would
- suggest.
+ /* If value is from the stack. If this is set, read_stack will be
+ used instead of read_memory to enable extra caching. */
+ unsigned int m_stack : 1;
- If `type' is a dynamic class (i.e. one with a vtable), then GDB can
- actually determine the object's run-time type by looking at the
- run-time type information in the vtable. When this information is
- available, we may elect to read in the entire object, for several
- reasons:
+ /* True if this is a zero value, created by 'value_zero'; false
+ otherwise. */
+ bool m_is_zero : 1;
- - When printing the value, the user would probably rather see the
+ /* True if this a value recorded in value history; false otherwise. */
+ bool m_in_history : 1;
+
+ /* Location of value (if lval). */
+ union
+ {
+ /* If lval == lval_memory, this is the address in the inferior */
+ CORE_ADDR address;
+
+ /*If lval == lval_register, the value is from a register. */
+ struct
+ {
+ /* Register number. */
+ int regnum;
+ /* Frame ID of "next" frame to which a register value is relative.
+ If the register value is found relative to frame F, then the
+ frame id of F->next will be stored in next_frame_id. */
+ struct frame_id next_frame_id;
+ } reg;
+
+ /* Pointer to internal variable. */
+ struct internalvar *internalvar;
+
+ /* Pointer to xmethod worker. */
+ struct xmethod_worker *xm_worker;
+
+ /* If lval == lval_computed, this is a set of function pointers
+ to use to access and describe the value, and a closure pointer
+ for them to use. */
+ struct
+ {
+ /* Functions to call. */
+ const struct lval_funcs *funcs;
+
+ /* Closure for those functions to use. */
+ void *closure;
+ } computed;
+ } m_location {};
+
+ /* Describes offset of a value within lval of a structure in target
+ addressable memory units. Note also the member embedded_offset
+ below. */
+ LONGEST m_offset = 0;
+
+ /* Only used for bitfields; number of bits contained in them. */
+ LONGEST m_bitsize = 0;
+
+ /* Only used for bitfields; position of start of field. For
+ little-endian targets, it is the position of the LSB. For
+ big-endian targets, it is the position of the MSB. */
+ LONGEST m_bitpos = 0;
+
+ /* The number of references to this value. When a value is created,
+ the value chain holds a reference, so REFERENCE_COUNT is 1. If
+ release_value is called, this value is removed from the chain but
+ the caller of release_value now has a reference to this value.
+ The caller must arrange for a call to value_free later. */
+ int m_reference_count = 1;
+
+ /* Only used for bitfields; the containing value. This allows a
+ single read from the target when displaying multiple
+ bitfields. */
+ value_ref_ptr m_parent;
+
+ /* Type of the value. */
+ struct type *m_type;
+
+ /* If a value represents a C++ object, then the `type' field gives
+ the object's compile-time type. If the object actually belongs
+ to some class derived from `type', perhaps with other base
+ classes and additional members, then `type' is just a subobject
+ of the real thing, and the full object is probably larger than
+ `type' would suggest.
+
+ If `type' is a dynamic class (i.e. one with a vtable), then GDB
+ can actually determine the object's run-time type by looking at
+ the run-time type information in the vtable. When this
+ information is available, we may elect to read in the entire
+ object, for several reasons:
+
+ - When printing the value, the user would probably rather see the
full object, not just the limited portion apparent from the
compile-time type.
- - If `type' has virtual base classes, then even printing `type'
+ - If `type' has virtual base classes, then even printing `type'
alone may require reaching outside the `type' portion of the
object to wherever the virtual base class has been stored.
- When we store the entire object, `enclosing_type' is the run-time
- type -- the complete object -- and `embedded_offset' is the offset
- of `type' within that larger type, in bytes. The value_contents()
- macro takes `embedded_offset' into account, so most GDB code
- continues to see the `type' portion of the value, just as the
- inferior would.
-
- If `type' is a pointer to an object, then `enclosing_type' is a
- pointer to the object's run-time type, and `pointed_to_offset' is
- the offset in bytes from the full object to the pointed-to object
- -- that is, the value `embedded_offset' would have if we followed
- the pointer and fetched the complete object. (I don't really see
- the point. Why not just determine the run-time type when you
- indirect, and avoid the special case? The contents don't matter
- until you indirect anyway.)
-
- If we're not doing anything fancy, `enclosing_type' is equal to
- `type', and `embedded_offset' is zero, so everything works
- normally. */
-
-extern struct type *value_enclosing_type (const struct value *);
-extern void set_value_enclosing_type (struct value *val,
- struct type *new_type);
+ When we store the entire object, `enclosing_type' is the run-time
+ type -- the complete object -- and `embedded_offset' is the
+ offset of `type' within that larger type, in target addressable memory
+ units. The value_contents() macro takes `embedded_offset' into account,
+ so most GDB code continues to see the `type' portion of the value, just
+ as the inferior would.
+
+ If `type' is a pointer to an object, then `enclosing_type' is a
+ pointer to the object's run-time type, and `pointed_to_offset' is
+ the offset in target addressable memory units from the full object
+ to the pointed-to object -- that is, the value `embedded_offset' would
+ have if we followed the pointer and fetched the complete object.
+ (I don't really see the point. Why not just determine the
+ run-time type when you indirect, and avoid the special case? The
+ contents don't matter until you indirect anyway.)
+
+ If we're not doing anything fancy, `enclosing_type' is equal to
+ `type', and `embedded_offset' is zero, so everything works
+ normally. */
+ struct type *m_enclosing_type;
+ LONGEST m_embedded_offset = 0;
+ LONGEST m_pointed_to_offset = 0;
+
+ /* Actual contents of the value. Target byte-order.
+
+ May be nullptr if the value is lazy or is entirely optimized out.
+ Guaranteed to be non-nullptr otherwise. */
+ gdb::unique_xmalloc_ptr<gdb_byte> m_contents;
+
+ /* Unavailable ranges in CONTENTS. We mark unavailable ranges,
+ rather than available, since the common and default case is for a
+ value to be available. This is filled in at value read time.
+ The unavailable ranges are tracked in bits. Note that a contents
+ bit that has been optimized out doesn't really exist in the
+ program, so it can't be marked unavailable either. */
+ std::vector<range> m_unavailable;
+
+ /* Likewise, but for optimized out contents (a chunk of the value of
+ a variable that does not actually exist in the program). If LVAL
+ is lval_register, this is a register ($pc, $sp, etc., never a
+ program variable) that has not been saved in the frame. Not
+ saved registers and optimized-out program variables values are
+ treated pretty much the same, except not-saved registers have a
+ different string representation and related error strings. */
+ std::vector<range> m_optimized_out;
+
+ /* This is only non-zero for values of TYPE_CODE_ARRAY and if the size of
+ the array in inferior memory is greater than max_value_size. If these
+ conditions are met then, when the value is loaded from the inferior
+ GDB will only load a portion of the array into memory, and
+ limited_length will be set to indicate the length in octets that were
+ loaded from the inferior. */
+ ULONGEST m_limited_length = 0;
+
+private:
+
+ /* Allocate a value and its contents for type TYPE. If CHECK_SIZE
+ is true, then apply the usual max-value-size checks. */
+ static struct value *allocate (struct type *type, bool check_size);
+};
/* Returns value_type or value_enclosing_type depending on
value_print_options.objectprint.
int resolve_simple_types,
int *real_type_found);
-extern LONGEST value_pointed_to_offset (const struct value *value);
-extern void set_value_pointed_to_offset (struct value *value, LONGEST val);
-extern LONGEST value_embedded_offset (const struct value *value);
-extern void set_value_embedded_offset (struct value *value, LONGEST val);
-
/* For lval_computed values, this structure holds functions used to
retrieve and set the value (or portions of the value).
TOVAL is not considered as an lvalue. */
void (*write) (struct value *toval, struct value *fromval);
+ /* Return true if any part of V is optimized out, false otherwise.
+ This will only be called for lazy values -- if the value has been
+ fetched, then the value's optimized-out bits are consulted
+ instead. */
+ bool (*is_optimized_out) (struct value *v);
+
/* If non-NULL, this is used to implement pointer indirection for
this value. This method may return NULL, in which case value_ind
will fall back to ordinary indirection. */
void (*free_closure) (struct value *v);
};
-/* Create a computed lvalue, with type TYPE, function pointers FUNCS,
- and closure CLOSURE. */
-
-extern struct value *allocate_computed_value (struct type *type,
- const struct lval_funcs *funcs,
- void *closure);
-
extern struct value *allocate_optimized_out_value (struct type *type);
-/* If VALUE is lval_computed, return its lval_funcs structure. */
-
-extern const struct lval_funcs *value_computed_funcs (const struct value *);
-
-/* If VALUE is lval_computed, return its closure. The meaning of the
- returned value depends on the functions VALUE uses. */
-
-extern void *value_computed_closure (const struct value *value);
-
-/* If zero, contents of this value are in the contents field. If
- nonzero, contents are in inferior. If the lval field is lval_memory,
- the contents are in inferior memory at location.address plus offset.
- The lval field may also be lval_register.
-
- WARNING: This field is used by the code which handles watchpoints
- (see breakpoint.c) to decide whether a particular value can be
- watched by hardware watchpoints. If the lazy flag is set for some
- member of a value chain, it is assumed that this member of the
- chain doesn't need to be watched as part of watching the value
- itself. This is how GDB avoids watching the entire struct or array
- when the user wants to watch a single struct member or array
- element. If you ever change the way lazy flag is set and reset, be
- sure to consider this use as well! */
-
-extern int value_lazy (const struct value *);
-extern void set_value_lazy (struct value *value, int val);
-
-extern int value_stack (const struct value *);
-extern void set_value_stack (struct value *value, int val);
-
/* Throw an error complaining that the value has been optimized
out. */
get to the real subobject, if the value happens to represent
something embedded in a larger run-time object. */
-extern gdb_byte *value_contents_raw (struct value *);
+extern gdb::array_view<gdb_byte> value_contents_raw (struct value *);
/* Actual contents of the value. For use of this value; setting it
uses the stuff above. Not valid if lazy is nonzero. Target
value. Note that a value therefore extends beyond what is
declared here. */
-extern const gdb_byte *value_contents (struct value *);
-extern gdb_byte *value_contents_writeable (struct value *);
+extern gdb::array_view<const gdb_byte> value_contents (struct value *);
+extern gdb::array_view<gdb_byte> value_contents_writeable (struct value *);
/* The ALL variants of the above two macros do not adjust the returned
pointer by the embedded_offset value. */
-extern gdb_byte *value_contents_all_raw (struct value *);
-extern const gdb_byte *value_contents_all (struct value *);
+extern gdb::array_view<gdb_byte> value_contents_all_raw (struct value *);
+extern gdb::array_view<const gdb_byte> value_contents_all (struct value *);
/* Like value_contents_all, but does not require that the returned
bits be valid. This should only be used in situations where you
plan to check the validity manually. */
-extern const gdb_byte *value_contents_for_printing (struct value *value);
+extern gdb::array_view<const gdb_byte> value_contents_for_printing (struct value *value);
/* Like value_contents_for_printing, but accepts a constant value
pointer. Unlike value_contents_for_printing however, the pointed
value must _not_ be lazy. */
-extern const gdb_byte *
+extern gdb::array_view<const gdb_byte>
value_contents_for_printing_const (const struct value *value);
extern void value_fetch_lazy (struct value *val);
extern void mark_value_bits_optimized_out (struct value *value,
LONGEST offset, LONGEST length);
-/* Set or return field indicating whether a variable is initialized or
- not, based on debugging information supplied by the compiler.
- 1 = initialized; 0 = uninitialized. */
-extern int value_initialized (const struct value *);
-extern void set_value_initialized (struct value *, int);
-
/* Set COMPONENT's location as appropriate for a component of WHOLE
--- regardless of what kind of lvalue WHOLE is. */
extern void set_value_component_location (struct value *component,
limited to just the first PIECE. Expect further change. */
/* Type of value; either not an lval, or one of the various different
possible kinds of lval. */
-extern enum lval_type *deprecated_value_lval_hack (struct value *);
-#define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
-
-/* Like VALUE_LVAL, except the parameter can be const. */
-extern enum lval_type value_lval_const (const struct value *value);
-
-/* If lval == lval_memory, return the address in the inferior. If
- lval == lval_register, return the byte offset into the registers
- structure. Otherwise, return 0. The returned address
- includes the offset, if any. */
-extern CORE_ADDR value_address (const struct value *);
-
-/* Like value_address, except the result does not include value's
- offset. */
-extern CORE_ADDR value_raw_address (const struct value *);
-
-/* Set the address of a value. */
-extern void set_value_address (struct value *, CORE_ADDR);
+#define VALUE_LVAL(val) (*((val)->deprecated_lval_hack ()))
/* Pointer to internal variable. */
-extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
-#define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
+#define VALUE_INTERNALVAR(val) (*((val)->deprecated_internalvar_hack ()))
/* Frame ID of "next" frame to which a register value is relative. A
register value is indicated by VALUE_LVAL being set to lval_register.
So, if the register value is found relative to frame F, then the
frame id of F->next will be stored in VALUE_NEXT_FRAME_ID. */
-extern struct frame_id *deprecated_value_next_frame_id_hack (struct value *);
-#define VALUE_NEXT_FRAME_ID(val) (*deprecated_value_next_frame_id_hack (val))
-
-/* Frame ID of frame to which a register value is relative. This is
- similar to VALUE_NEXT_FRAME_ID, above, but may not be assigned to.
- Note that VALUE_FRAME_ID effectively undoes the "next" operation
- that was performed during the assignment to VALUE_NEXT_FRAME_ID. */
-#define VALUE_FRAME_ID(val) (get_prev_frame_id_by_id (VALUE_NEXT_FRAME_ID (val)))
+#define VALUE_NEXT_FRAME_ID(val) (*((val)->deprecated_next_frame_id_hack ()))
/* Register number if the value is from a register. */
-extern int *deprecated_value_regnum_hack (struct value *);
-#define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
+#define VALUE_REGNUM(val) (*((val)->deprecated_regnum_hack ()))
/* Return value after lval_funcs->coerce_ref (after check_typedef). Return
NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
byte is unavailable. */
extern int value_bytes_available (const struct value *value,
- LONGEST offset, LONGEST length);
+ LONGEST offset, ULONGEST length);
/* Given a value, determine whether the contents bits starting at
OFFSET and extending for LENGTH bits are available. This returns
bit is unavailable. */
extern int value_bits_available (const struct value *value,
- LONGEST offset, LONGEST length);
+ LONGEST offset, ULONGEST length);
/* Like value_bytes_available, but return false if any byte in the
whole object is unavailable. */
LENGTH bytes as unavailable. */
extern void mark_value_bytes_unavailable (struct value *value,
- LONGEST offset, LONGEST length);
+ LONGEST offset, ULONGEST length);
/* Mark VALUE's content bits starting at OFFSET and extending for
LENGTH bits as unavailable. */
extern void mark_value_bits_unavailable (struct value *value,
- LONGEST offset, LONGEST length);
+ LONGEST offset, ULONGEST length);
/* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
LENGTH bytes of VAL2's contents starting at OFFSET2.
example, to compare a complete object value with itself, including
its enclosing type chunk, you'd do:
- int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
+ int len = check_typedef (val->enclosing_type ())->length ();
value_contents_eq (val, 0, val, 0, len);
Returns true iff the set of available/valid contents match.
const struct value *val2, LONGEST offset2,
LONGEST length);
+/* An overload of value_contents_eq that compares the entirety of both
+ values. */
+
+extern bool value_contents_eq (const struct value *val1,
+ const struct value *val2);
+
/* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
which is (or will be copied to) VAL's contents buffer offset by
BIT_OFFSET bits. Marks value contents ranges as unavailable if
#include "gdbtypes.h"
#include "expression.h"
-struct frame_info;
+class frame_info_ptr;
struct fn_field;
extern int print_address_demangle (const struct value_print_options *,
extern struct value *value_from_component (struct value *, struct type *,
LONGEST);
+
+/* Create a new value by extracting it from WHOLE. TYPE is the type
+ of the new value. BIT_OFFSET and BIT_LENGTH describe the offset
+ and field width of the value to extract from WHOLE -- BIT_LENGTH
+ may differ from TYPE's length in the case where WHOLE's type is
+ packed.
+
+ When the value does come from a non-byte-aligned offset or field
+ width, it will be marked non_lval. */
+
+extern struct value *value_from_component_bitsize (struct value *whole,
+ struct type *type,
+ LONGEST bit_offset,
+ LONGEST bit_length);
+
extern struct value *value_at (struct type *type, CORE_ADDR addr);
extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
+/* Like value_at, but ensures that the result is marked not_lval.
+ This can be important if the memory is "volatile". */
+extern struct value *value_at_non_lval (struct type *type, CORE_ADDR addr);
+
extern struct value *value_from_contents_and_address_unresolved
(struct type *, const gdb_byte *, CORE_ADDR);
extern struct value *value_from_contents_and_address (struct type *,
struct frame_id frame_id);
extern void read_frame_register_value (struct value *value,
- struct frame_info *frame);
+ frame_info_ptr frame);
extern struct value *value_from_register (struct type *type, int regnum,
- struct frame_info *frame);
+ frame_info_ptr frame);
extern CORE_ADDR address_from_register (int regnum,
- struct frame_info *frame);
+ frame_info_ptr frame);
extern struct value *value_of_variable (struct symbol *var,
const struct block *b);
extern struct value *address_of_variable (struct symbol *var,
const struct block *b);
-extern struct value *value_of_register (int regnum, struct frame_info *frame);
+extern struct value *value_of_register (int regnum, frame_info_ptr frame);
-struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
+struct value *value_of_register_lazy (frame_info_ptr frame, int regnum);
/* Return the symbol's reading requirement. */
extern struct value *read_var_value (struct symbol *var,
const struct block *var_block,
- struct frame_info *frame);
+ frame_info_ptr frame);
-extern struct value *allocate_value (struct type *type);
-extern struct value *allocate_value_lazy (struct type *type);
extern void value_contents_copy (struct value *dst, LONGEST dst_offset,
struct value *src, LONGEST src_offset,
LONGEST length);
-extern void value_contents_copy_raw (struct value *dst, LONGEST dst_offset,
- struct value *src, LONGEST src_offset,
- LONGEST length);
extern struct value *allocate_repeat_value (struct type *type, int count);
extern struct value *value_complement (struct value *arg1);
extern struct value *value_struct_elt (struct value **argp,
- struct value **args,
+ gdb::optional<gdb::array_view <value *>> args,
const char *name, int *static_memfuncp,
const char *err);
struct value *function,
struct type *value_type);
-extern struct value *evaluate_expression (struct expression *exp);
-
-extern struct value *evaluate_type (struct expression *exp);
+/* Evaluate the expression EXP. If set, EXPECT_TYPE is passed to the
+ outermost operation's evaluation. This is ignored by most
+ operations, but may be used, e.g., to determine the type of an
+ otherwise untyped symbol. The caller should not assume that the
+ returned value has this type. */
-extern struct value *evaluate_subexp (struct type *expect_type,
- struct expression *exp,
- int *pos, enum noside noside);
+extern struct value *evaluate_expression (struct expression *exp,
+ struct type *expect_type = nullptr);
-extern struct value *evaluate_subexpression_type (struct expression *exp,
- int subexp);
+extern struct value *evaluate_type (struct expression *exp);
extern value *evaluate_var_value (enum noside noside, const block *blk,
symbol *var);
struct objfile *objfile,
minimal_symbol *msymbol);
-extern value *eval_skip_value (expression *exp);
-
-extern void fetch_subexp_value (struct expression *exp, int *pc,
+namespace expr { class operation; };
+extern void fetch_subexp_value (struct expression *exp,
+ expr::operation *op,
struct value **valp, struct value **resultp,
std::vector<value_ref_ptr> *val_chain,
bool preserve_errors);
-extern const char *extract_field_op (struct expression *exp, int *subexp);
-
-extern struct value *evaluate_subexp_with_coercion (struct expression *,
- int *, enum noside);
-
extern struct value *parse_and_eval (const char *exp);
extern struct value *parse_to_comma_and_eval (const char **expp);
-extern struct type *parse_and_eval_type (char *p, int length);
+extern struct type *parse_and_eval_type (const char *p, int length);
extern CORE_ADDR parse_and_eval_address (const char *exp);
extern struct value *access_value_history (int num);
+/* Return the number of items in the value history. */
+
+extern ULONGEST value_history_count ();
+
extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
struct internalvar *var);
struct agent_expr *expr,
struct axs_value *value,
void *data);
-
- /* If non-NULL, this is called to destroy DATA. The DATA argument
- passed to this function is the same argument that was passed to
- `create_internalvar_type_lazy'. */
-
- void (*destroy) (void *data);
};
extern struct internalvar *create_internalvar_type_lazy (const char *name,
extern int value_less (struct value *arg1, struct value *arg2);
-extern int value_logical_not (struct value *arg1);
+/* Simulate the C operator ! -- return true if ARG1 contains zero. */
+extern bool value_logical_not (struct value *arg1);
+
+/* Returns true if the value VAL represents a true value. */
+static inline bool
+value_true (struct value *val)
+{
+ return !value_logical_not (val);
+}
/* C++ */
extern void value_print (struct value *val, struct ui_file *stream,
const struct value_print_options *options);
-extern void value_print_array_elements (struct value *val,
- struct ui_file *stream, int format,
- enum val_prettyformat pretty);
-
/* 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
extern void print_variable_and_value (const char *name,
struct symbol *var,
- struct frame_info *frame,
+ frame_info_ptr frame,
struct ui_file *stream,
int indent);
/* From values.c */
-extern struct value *value_copy (struct value *);
+extern struct value *value_copy (const value *);
extern struct value *value_non_lval (struct value *);
extern struct value *value_allocate_space_in_inferior (int);
-extern struct value *value_subscripted_rvalue (struct value *array,
- LONGEST index,
- LONGEST lowerbound);
-
/* User function handler. */
typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
struct value *function,
int argc, struct value **argv);
-char *value_internal_function_name (struct value *);
+const char *value_internal_function_name (struct value *);
/* Build a value wrapping and representing WORKER. The value takes ownership
of the xmethod_worker object. */
exiting (e.g., on quit_force). */
extern void finalize_values ();
+/* Convert VALUE to a gdb_mpq. The caller must ensure that VALUE is
+ of floating-point, fixed-point, or integer type. */
+extern gdb_mpq value_to_gdb_mpq (struct value *value);
+
+/* While an instance of this class is live, and array values that are
+ created, that are larger than max_value_size, will be restricted in size
+ to a particular number of elements. */
+
+struct scoped_array_length_limiting
+{
+ /* Limit any large array values to only contain ELEMENTS elements. */
+ scoped_array_length_limiting (int elements);
+
+ /* Restore the previous array value limit. */
+ ~scoped_array_length_limiting ();
+
+private:
+ /* Used to hold the previous array value element limit. */
+ gdb::optional<int> m_old_value;
+};
+
#endif /* !defined (VALUE_H) */
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