Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
- 2009 Free Software Foundation, Inc.
+ 2009, 2010 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "arch-utils.h"
#include "gdb_string.h"
#include "symtab.h"
#include "gdbtypes.h"
gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
int bitpos;
+ /* Only used for bitfields; the containing value. This allows a
+ single read from the target when displaying multiple
+ bitfields. */
+ struct value *parent;
+
/* Frame register value is relative to. This will be described in
the lval enum above as "lval_register". */
struct frame_id frame_id;
/* If value is a variable, is it initialized or not. */
int initialized;
+ /* If value is from the stack. If this is set, read_stack will be
+ used instead of read_memory to enable extra caching. */
+ int stack;
+
/* Actual contents of the value. Target byte-order. NULL or not
valid if lazy is nonzero. */
gdb_byte *contents;
+
+ /* 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 reference_count;
};
/* Prototypes for local functions. */
static int value_history_count; /* Abs number of last entry stored */
-/* The type of internal functions. */
-
-static struct type *internal_fn_type;
\f
/* List of all value objects currently allocated
(except for those released by calls to release_value)
allocate_value_lazy (struct type *type)
{
struct value *val;
- struct type *atype = check_typedef (type);
+
+ /* Call check_typedef on our type to make sure that, if TYPE
+ is a TYPE_CODE_TYPEDEF, its length is set to the length
+ of the target type instead of zero. However, we do not
+ replace the typedef type by the target type, because we want
+ to keep the typedef in order to be able to set the VAL's type
+ description correctly. */
+ check_typedef (type);
val = (struct value *) xzalloc (sizeof (struct value));
val->contents = NULL;
val->pointed_to_offset = 0;
val->modifiable = 1;
val->initialized = 1; /* Default to initialized. */
+
+ /* Values start out on the all_values chain. */
+ val->reference_count = 1;
+
return val;
}
int low_bound = current_language->string_lower_bound; /* ??? */
/* FIXME-type-allocation: need a way to free this type when we are
done with it. */
- struct type *range_type
- = create_range_type ((struct type *) NULL, builtin_type_int32,
- low_bound, count + low_bound - 1);
- /* FIXME-type-allocation: need a way to free this type when we are
- done with it. */
- return allocate_value (create_array_type ((struct type *) NULL,
- type, range_type));
-}
-
-/* Needed if another module needs to maintain its on list of values. */
-void
-value_prepend_to_list (struct value **head, struct value *val)
-{
- val->next = *head;
- *head = val;
-}
-
-/* Needed if another module needs to maintain its on list of values. */
-void
-value_remove_from_list (struct value **head, struct value *val)
-{
- struct value *prev;
-
- if (*head == val)
- *head = (*head)->next;
- else
- for (prev = *head; prev->next; prev = prev->next)
- if (prev->next == val)
- {
- prev->next = val->next;
- break;
- }
+ struct type *array_type
+ = lookup_array_range_type (type, low_bound, count + low_bound - 1);
+ return allocate_value (array_type);
}
struct value *
value->bitsize = bit;
}
+struct value *
+value_parent (struct value *value)
+{
+ return value->parent;
+}
+
gdb_byte *
value_contents_raw (struct value *value)
{
value->lazy = val;
}
+int
+value_stack (struct value *value)
+{
+ return value->stack;
+}
+
+void
+set_value_stack (struct value *value, int val)
+{
+ value->stack = val;
+}
+
const gdb_byte *
value_contents (struct value *value)
{
return all_values;
}
+/* Take a reference to VAL. VAL will not be deallocated until all
+ references are released. */
+
+void
+value_incref (struct value *val)
+{
+ val->reference_count++;
+}
+
+/* Release a reference to VAL, which was acquired with value_incref.
+ This function is also called to deallocate values from the value
+ chain. */
+
void
value_free (struct value *val)
{
if (val)
{
+ gdb_assert (val->reference_count > 0);
+ val->reference_count--;
+ if (val->reference_count > 0)
+ return;
+
+ /* If there's an associated parent value, drop our reference to
+ it. */
+ if (val->parent != NULL)
+ value_free (val->parent);
+
if (VALUE_LVAL (val) == lval_computed)
{
struct lval_funcs *funcs = val->location.computed.funcs;
}
/* Free all the values that have been allocated (except for those released).
- Called after each command, successful or not. */
+ Call after each command, successful or not.
+ In practice this is called before each command, which is sufficient. */
void
free_all_values (void)
TYPE_LENGTH (value_enclosing_type (arg)));
}
+ val->parent = arg->parent;
+ if (val->parent)
+ value_incref (val->parent);
if (VALUE_LVAL (val) == lval_computed)
{
struct lval_funcs *funcs = val->location.computed.funcs;
{
struct internalvar *next;
char *name;
- struct type *type;
- /* True if this internalvar is the canonical name for a convenience
- function. */
- int canonical;
+ /* We support various different kinds of content of an internal variable.
+ enum internalvar_kind specifies the kind, and union internalvar_data
+ provides the data associated with this particular kind. */
+
+ enum internalvar_kind
+ {
+ /* The internal variable is empty. */
+ INTERNALVAR_VOID,
+
+ /* The value of the internal variable is provided directly as
+ a GDB value object. */
+ INTERNALVAR_VALUE,
+
+ /* A fresh value is computed via a call-back routine on every
+ access to the internal variable. */
+ INTERNALVAR_MAKE_VALUE,
+
+ /* The internal variable holds a GDB internal convenience function. */
+ INTERNALVAR_FUNCTION,
+
+ /* The variable holds an integer value. */
+ INTERNALVAR_INTEGER,
+
+ /* The variable holds a pointer value. */
+ INTERNALVAR_POINTER,
- /* If this function is non-NULL, it is used to compute a fresh value
- on every access to the internalvar. */
- internalvar_make_value make_value;
+ /* The variable holds a GDB-provided string. */
+ INTERNALVAR_STRING,
+
+ } kind;
- /* To reduce dependencies on target properties (like byte order) that
- may change during the lifetime of an internal variable, we store
- simple scalar values as host objects. */
union internalvar_data
{
- struct value *v;
- struct internal_function *f;
- LONGEST l;
- CORE_ADDR a;
+ /* A value object used with INTERNALVAR_VALUE. */
+ struct value *value;
+
+ /* The call-back routine used with INTERNALVAR_MAKE_VALUE. */
+ internalvar_make_value make_value;
+
+ /* The internal function used with INTERNALVAR_FUNCTION. */
+ struct
+ {
+ struct internal_function *function;
+ /* True if this is the canonical name for the function. */
+ int canonical;
+ } fn;
+
+ /* An integer value used with INTERNALVAR_INTEGER. */
+ struct
+ {
+ /* If type is non-NULL, it will be used as the type to generate
+ a value for this internal variable. If type is NULL, a default
+ integer type for the architecture is used. */
+ struct type *type;
+ LONGEST val;
+ } integer;
+
+ /* A pointer value used with INTERNALVAR_POINTER. */
+ struct
+ {
+ struct type *type;
+ CORE_ADDR val;
+ } pointer;
+
+ /* A string value used with INTERNALVAR_STRING. */
+ char *string;
} u;
};
/* Only evaluate the expression if the lvalue is void.
This may still fail if the expresssion is invalid. */
- if (TYPE_CODE (intvar->type) == TYPE_CODE_VOID)
+ if (intvar->kind == INTERNALVAR_VOID)
evaluate_expression (expr);
do_cleanups (old_chain);
struct internalvar *var;
var = (struct internalvar *) xmalloc (sizeof (struct internalvar));
var->name = concat (name, (char *)NULL);
- var->type = builtin_type_void;
- var->make_value = NULL;
- var->canonical = 0;
+ var->kind = INTERNALVAR_VOID;
var->next = internalvars;
internalvars = var;
return var;
create_internalvar_type_lazy (char *name, internalvar_make_value fun)
{
struct internalvar *var = create_internalvar (name);
- var->make_value = fun;
+ var->kind = INTERNALVAR_MAKE_VALUE;
+ var->u.make_value = fun;
return var;
}
return create_internalvar (name);
}
+/* Return current value of internal variable VAR. For variables that
+ are not inherently typed, use a value type appropriate for GDBARCH. */
+
struct value *
-value_of_internalvar (struct internalvar *var)
+value_of_internalvar (struct gdbarch *gdbarch, struct internalvar *var)
{
struct value *val;
- if (var->make_value != NULL)
- val = (*var->make_value) (var);
- else
+ switch (var->kind)
{
- switch (TYPE_CODE (var->type))
- {
- case TYPE_CODE_VOID:
- case TYPE_CODE_INTERNAL_FUNCTION:
- val = allocate_value (var->type);
- break;
+ case INTERNALVAR_VOID:
+ val = allocate_value (builtin_type (gdbarch)->builtin_void);
+ break;
- case TYPE_CODE_INT:
- val = value_from_longest (var->type, var->u.l);
- break;
+ case INTERNALVAR_FUNCTION:
+ val = allocate_value (builtin_type (gdbarch)->internal_fn);
+ break;
- case TYPE_CODE_PTR:
- val = value_from_pointer (var->type, var->u.a);
- break;
+ case INTERNALVAR_INTEGER:
+ if (!var->u.integer.type)
+ val = value_from_longest (builtin_type (gdbarch)->builtin_int,
+ var->u.integer.val);
+ else
+ val = value_from_longest (var->u.integer.type, var->u.integer.val);
+ break;
- default:
- val = value_copy (var->u.v);
- break;
- }
+ case INTERNALVAR_POINTER:
+ val = value_from_pointer (var->u.pointer.type, var->u.pointer.val);
+ break;
+ case INTERNALVAR_STRING:
+ val = value_cstring (var->u.string, strlen (var->u.string),
+ builtin_type (gdbarch)->builtin_char);
+ break;
+
+ case INTERNALVAR_VALUE:
+ val = value_copy (var->u.value);
if (value_lazy (val))
value_fetch_lazy (val);
+ break;
- /* If the variable's value is a computed lvalue, we want
- references to it to produce another computed lvalue, where
- referencces and assignments actually operate through the
- computed value's functions.
-
- This means that internal variables with computed values
- behave a little differently from other internal variables:
- assignments to them don't just replace the previous value
- altogether. At the moment, this seems like the behavior we
- want. */
- if (val->lval != lval_computed)
- {
- VALUE_LVAL (val) = lval_internalvar;
- VALUE_INTERNALVAR (val) = var;
- }
+ case INTERNALVAR_MAKE_VALUE:
+ val = (*var->u.make_value) (gdbarch, var);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, "bad kind");
+ }
+
+ /* Change the VALUE_LVAL to lval_internalvar so that future operations
+ on this value go back to affect the original internal variable.
+
+ Do not do this for INTERNALVAR_MAKE_VALUE variables, as those have
+ no underlying modifyable state in the internal variable.
+
+ Likewise, if the variable's value is a computed lvalue, we want
+ references to it to produce another computed lvalue, where
+ references and assignments actually operate through the
+ computed value's functions.
+
+ This means that internal variables with computed values
+ behave a little differently from other internal variables:
+ assignments to them don't just replace the previous value
+ altogether. At the moment, this seems like the behavior we
+ want. */
+
+ if (var->kind != INTERNALVAR_MAKE_VALUE
+ && val->lval != lval_computed)
+ {
+ VALUE_LVAL (val) = lval_internalvar;
+ VALUE_INTERNALVAR (val) = var;
}
return val;
int
get_internalvar_integer (struct internalvar *var, LONGEST *result)
{
- switch (TYPE_CODE (var->type))
+ switch (var->kind)
{
- case TYPE_CODE_INT:
- *result = var->u.l;
+ case INTERNALVAR_INTEGER:
+ *result = var->u.integer.val;
return 1;
default:
get_internalvar_function (struct internalvar *var,
struct internal_function **result)
{
- switch (TYPE_CODE (var->type))
+ switch (var->kind)
{
- case TYPE_CODE_INTERNAL_FUNCTION:
- *result = var->u.f;
+ case INTERNALVAR_FUNCTION:
+ *result = var->u.fn.function;
return 1;
default:
{
gdb_byte *addr;
- switch (TYPE_CODE (var->type))
+ switch (var->kind)
{
- case TYPE_CODE_VOID:
- case TYPE_CODE_INTERNAL_FUNCTION:
- case TYPE_CODE_INT:
- case TYPE_CODE_PTR:
- /* We can never get a component of a basic type. */
- internal_error (__FILE__, __LINE__, "set_internalvar_component");
-
- default:
- addr = value_contents_writeable (var->u.v);
+ case INTERNALVAR_VALUE:
+ addr = value_contents_writeable (var->u.value);
if (bitsize)
- modify_field (addr + offset,
+ modify_field (value_type (var->u.value), addr + offset,
value_as_long (newval), bitpos, bitsize);
else
memcpy (addr + offset, value_contents (newval),
TYPE_LENGTH (value_type (newval)));
break;
+
+ default:
+ /* We can never get a component of any other kind. */
+ internal_error (__FILE__, __LINE__, "set_internalvar_component");
}
}
void
set_internalvar (struct internalvar *var, struct value *val)
{
- struct type *new_type = check_typedef (value_type (val));
+ enum internalvar_kind new_kind;
union internalvar_data new_data = { 0 };
- if (var->canonical)
+ if (var->kind == INTERNALVAR_FUNCTION && var->u.fn.canonical)
error (_("Cannot overwrite convenience function %s"), var->name);
/* Prepare new contents. */
- switch (TYPE_CODE (new_type))
+ switch (TYPE_CODE (check_typedef (value_type (val))))
{
case TYPE_CODE_VOID:
+ new_kind = INTERNALVAR_VOID;
break;
case TYPE_CODE_INTERNAL_FUNCTION:
gdb_assert (VALUE_LVAL (val) == lval_internalvar);
- get_internalvar_function (VALUE_INTERNALVAR (val), &new_data.f);
+ new_kind = INTERNALVAR_FUNCTION;
+ get_internalvar_function (VALUE_INTERNALVAR (val),
+ &new_data.fn.function);
+ /* Copies created here are never canonical. */
break;
case TYPE_CODE_INT:
- new_data.l = value_as_long (val);
+ new_kind = INTERNALVAR_INTEGER;
+ new_data.integer.type = value_type (val);
+ new_data.integer.val = value_as_long (val);
break;
case TYPE_CODE_PTR:
- new_data.a = value_as_address (val);
+ new_kind = INTERNALVAR_POINTER;
+ new_data.pointer.type = value_type (val);
+ new_data.pointer.val = value_as_address (val);
break;
default:
- new_data.v = value_copy (val);
- new_data.v->modifiable = 1;
+ new_kind = INTERNALVAR_VALUE;
+ new_data.value = value_copy (val);
+ new_data.value->modifiable = 1;
/* Force the value to be fetched from the target now, to avoid problems
later when this internalvar is referenced and the target is gone or
has changed. */
- if (value_lazy (new_data.v))
- value_fetch_lazy (new_data.v);
+ if (value_lazy (new_data.value))
+ value_fetch_lazy (new_data.value);
/* Release the value from the value chain to prevent it from being
deleted by free_all_values. From here on this function should not
call error () until new_data is installed into the var->u to avoid
leaking memory. */
- release_value (new_data.v);
+ release_value (new_data.value);
break;
}
clear_internalvar (var);
/* Switch over. */
- var->type = new_type;
+ var->kind = new_kind;
var->u = new_data;
/* End code which must not call error(). */
}
/* Clean up old contents. */
clear_internalvar (var);
- /* Use a platform-independent 32-bit integer type. */
- var->type = builtin_type_int32;
- var->u.l = l;
+ var->kind = INTERNALVAR_INTEGER;
+ var->u.integer.type = NULL;
+ var->u.integer.val = l;
+}
+
+void
+set_internalvar_string (struct internalvar *var, const char *string)
+{
+ /* Clean up old contents. */
+ clear_internalvar (var);
+
+ var->kind = INTERNALVAR_STRING;
+ var->u.string = xstrdup (string);
}
static void
/* Clean up old contents. */
clear_internalvar (var);
- var->type = internal_fn_type;
- var->u.f = f;
+ var->kind = INTERNALVAR_FUNCTION;
+ var->u.fn.function = f;
+ var->u.fn.canonical = 1;
+ /* Variables installed here are always the canonical version. */
}
void
clear_internalvar (struct internalvar *var)
{
/* Clean up old contents. */
- switch (TYPE_CODE (var->type))
+ switch (var->kind)
{
- case TYPE_CODE_VOID:
- case TYPE_CODE_INTERNAL_FUNCTION:
- case TYPE_CODE_INT:
- case TYPE_CODE_PTR:
+ case INTERNALVAR_VALUE:
+ value_free (var->u.value);
+ break;
+
+ case INTERNALVAR_STRING:
+ xfree (var->u.string);
break;
default:
- value_free (var->u.v);
break;
}
- /* Set to void type. */
- var->type = builtin_type_void;
+ /* Reset to void kind. */
+ var->kind = INTERNALVAR_VOID;
}
char *
}
struct value *
-call_internal_function (struct value *func, int argc, struct value **argv)
+call_internal_function (struct gdbarch *gdbarch,
+ const struct language_defn *language,
+ struct value *func, int argc, struct value **argv)
{
struct internal_function *ifn;
int result;
result = get_internalvar_function (VALUE_INTERNALVAR (func), &ifn);
gdb_assert (result);
- return (*ifn->handler) (ifn->cookie, argc, argv);
+ return (*ifn->handler) (gdbarch, language, ifn->cookie, argc, argv);
}
/* The 'function' command. This does nothing -- it is just a
ifn = create_internal_function (name, handler, cookie);
set_internalvar_function (var, ifn);
- var->canonical = 1;
cmd = add_cmd (xstrdup (name), no_class, function_command, (char *) doc,
&functionlist);
/* Update VALUE before discarding OBJFILE. COPIED_TYPES is used to
prevent cycles / duplicates. */
-static void
+void
preserve_one_value (struct value *value, struct objfile *objfile,
htab_t copied_types)
{
copied_types);
}
+/* Likewise for internal variable VAR. */
+
+static void
+preserve_one_internalvar (struct internalvar *var, struct objfile *objfile,
+ htab_t copied_types)
+{
+ switch (var->kind)
+ {
+ case INTERNALVAR_INTEGER:
+ if (var->u.integer.type && TYPE_OBJFILE (var->u.integer.type) == objfile)
+ var->u.integer.type
+ = copy_type_recursive (objfile, var->u.integer.type, copied_types);
+ break;
+
+ case INTERNALVAR_POINTER:
+ if (TYPE_OBJFILE (var->u.pointer.type) == objfile)
+ var->u.pointer.type
+ = copy_type_recursive (objfile, var->u.pointer.type, copied_types);
+ break;
+
+ case INTERNALVAR_VALUE:
+ preserve_one_value (var->u.value, objfile, copied_types);
+ break;
+ }
+}
+
/* Update the internal variables and value history when OBJFILE is
discarded; we must copy the types out of the objfile. New global types
will be created for every convenience variable which currently points to
preserve_one_value (cur->values[i], objfile, copied_types);
for (var = internalvars; var; var = var->next)
- {
- if (TYPE_OBJFILE (var->type) == objfile)
- var->type = copy_type_recursive (objfile, var->type, copied_types);
-
- switch (TYPE_CODE (var->type))
- {
- case TYPE_CODE_VOID:
- case TYPE_CODE_INTERNAL_FUNCTION:
- case TYPE_CODE_INT:
- case TYPE_CODE_PTR:
- break;
+ preserve_one_internalvar (var, objfile, copied_types);
- default:
- preserve_one_value (var->u.v, objfile, copied_types);
- break;
- }
- }
-
- for (val = values_in_python; val; val = val->next)
- preserve_one_value (val, objfile, copied_types);
+ preserve_python_values (objfile, copied_types);
htab_delete (copied_types);
}
static void
show_convenience (char *ignore, int from_tty)
{
+ struct gdbarch *gdbarch = get_current_arch ();
struct internalvar *var;
int varseen = 0;
struct value_print_options opts;
varseen = 1;
}
printf_filtered (("$%s = "), var->name);
- value_print (value_of_internalvar (var), gdb_stdout,
+ value_print (value_of_internalvar (gdbarch, var), gdb_stdout,
&opts);
printf_filtered (("\n"));
}
CORE_ADDR
value_as_address (struct value *val)
{
+ struct gdbarch *gdbarch = get_type_arch (value_type (val));
+
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
#if 0
/* gdbarch_addr_bits_remove is wrong if we are being called for a
non-address (e.g. argument to "signal", "info break", etc.), or
for pointers to char, in which the low bits *are* significant. */
- return gdbarch_addr_bits_remove (current_gdbarch, value_as_long (val));
+ return gdbarch_addr_bits_remove (gdbarch, value_as_long (val));
#else
/* There are several targets (IA-64, PowerPC, and others) which
if (TYPE_CODE (value_type (val)) != TYPE_CODE_PTR
&& TYPE_CODE (value_type (val)) != TYPE_CODE_REF
- && gdbarch_integer_to_address_p (current_gdbarch))
- return gdbarch_integer_to_address (current_gdbarch, value_type (val),
+ && gdbarch_integer_to_address_p (gdbarch))
+ return gdbarch_integer_to_address (gdbarch, value_type (val),
value_contents (val));
return unpack_long (value_type (val), value_contents (val));
LONGEST
unpack_long (struct type *type, const gdb_byte *valaddr)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
enum type_code code = TYPE_CODE (type);
int len = TYPE_LENGTH (type);
int nosign = TYPE_UNSIGNED (type);
case TYPE_CODE_RANGE:
case TYPE_CODE_MEMBERPTR:
if (nosign)
- return extract_unsigned_integer (valaddr, len);
+ return extract_unsigned_integer (valaddr, len, byte_order);
else
- return extract_signed_integer (valaddr, len);
+ return extract_signed_integer (valaddr, len, byte_order);
case TYPE_CODE_FLT:
return extract_typed_floating (valaddr, type);
case TYPE_CODE_DECFLOAT:
/* libdecnumber has a function to convert from decimal to integer, but
it doesn't work when the decimal number has a fractional part. */
- return decimal_to_doublest (valaddr, len);
+ return decimal_to_doublest (valaddr, len, byte_order);
case TYPE_CODE_PTR:
case TYPE_CODE_REF:
DOUBLEST
unpack_double (struct type *type, const gdb_byte *valaddr, int *invp)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
enum type_code code;
int len;
int nosign;
return extract_typed_floating (valaddr, type);
}
else if (code == TYPE_CODE_DECFLOAT)
- return decimal_to_doublest (valaddr, len);
+ return decimal_to_doublest (valaddr, len, byte_order);
else if (nosign)
{
/* Unsigned -- be sure we compensate for signed LONGEST. */
CHECK_TYPEDEF (arg_type);
type = TYPE_FIELD_TYPE (arg_type, fieldno);
+ /* Call check_typedef on our type to make sure that, if TYPE
+ is a TYPE_CODE_TYPEDEF, its length is set to the length
+ of the target type instead of zero. However, we do not
+ replace the typedef type by the target type, because we want
+ to keep the typedef in order to be able to print the type
+ description correctly. */
+ check_typedef (type);
+
/* Handle packed fields */
if (TYPE_FIELD_BITSIZE (arg_type, fieldno))
{
- v = value_from_longest (type,
- unpack_field_as_long (arg_type,
- value_contents (arg1)
- + offset,
- fieldno));
- v->bitpos = TYPE_FIELD_BITPOS (arg_type, fieldno) % 8;
+ /* Create a new value for the bitfield, with bitpos and bitsize
+ set. If possible, arrange offset and bitpos so that we can
+ do a single aligned read of the size of the containing type.
+ Otherwise, adjust offset to the byte containing the first
+ bit. Assume that the address, offset, and embedded offset
+ are sufficiently aligned. */
+ int bitpos = TYPE_FIELD_BITPOS (arg_type, fieldno);
+ int container_bitsize = TYPE_LENGTH (type) * 8;
+
+ v = allocate_value_lazy (type);
v->bitsize = TYPE_FIELD_BITSIZE (arg_type, fieldno);
- v->offset = value_offset (arg1) + offset
- + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8;
+ if ((bitpos % container_bitsize) + v->bitsize <= container_bitsize
+ && TYPE_LENGTH (type) <= (int) sizeof (LONGEST))
+ v->bitpos = bitpos % container_bitsize;
+ else
+ v->bitpos = bitpos % 8;
+ v->offset = value_embedded_offset (arg1)
+ + (bitpos - v->bitpos) / 8;
+ v->parent = arg1;
+ value_incref (v->parent);
+ if (!value_lazy (arg1))
+ value_fetch_lazy (v);
}
else if (fieldno < TYPE_N_BASECLASSES (arg_type))
{
}
\f
-/* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at
- VALADDR.
+/* Unpack a bitfield of the specified FIELD_TYPE, from the anonymous
+ object at VALADDR. The bitfield starts at BITPOS bits and contains
+ BITSIZE bits.
Extracting bits depends on endianness of the machine. Compute the
number of least significant bits to discard. For big endian machines,
If the field is signed, we also do sign extension. */
LONGEST
-unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
+unpack_bits_as_long (struct type *field_type, const gdb_byte *valaddr,
+ int bitpos, int bitsize)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (field_type));
ULONGEST val;
ULONGEST valmask;
- int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
- int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
int lsbcount;
- struct type *field_type;
+ int bytes_read;
- val = extract_unsigned_integer (valaddr + bitpos / 8, sizeof (val));
- field_type = TYPE_FIELD_TYPE (type, fieldno);
+ /* Read the minimum number of bytes required; there may not be
+ enough bytes to read an entire ULONGEST. */
CHECK_TYPEDEF (field_type);
+ if (bitsize)
+ bytes_read = ((bitpos % 8) + bitsize + 7) / 8;
+ else
+ bytes_read = TYPE_LENGTH (field_type);
+
+ val = extract_unsigned_integer (valaddr + bitpos / 8,
+ bytes_read, byte_order);
/* Extract bits. See comment above. */
- if (gdbarch_bits_big_endian (current_gdbarch))
- lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize);
+ if (gdbarch_bits_big_endian (get_type_arch (field_type)))
+ lsbcount = (bytes_read * 8 - bitpos % 8 - bitsize);
else
lsbcount = (bitpos % 8);
val >>= lsbcount;
return (val);
}
+/* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at
+ VALADDR. See unpack_bits_as_long for more details. */
+
+LONGEST
+unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
+{
+ int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
+ int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
+ struct type *field_type = TYPE_FIELD_TYPE (type, fieldno);
+
+ return unpack_bits_as_long (field_type, valaddr, bitpos, bitsize);
+}
+
/* Modify the value of a bitfield. ADDR points to a block of memory in
target byte order; the bitfield starts in the byte pointed to. FIELDVAL
is the desired value of the field, in host byte order. BITPOS and BITSIZE
0 <= BITPOS, where lbits is the size of a LONGEST in bits. */
void
-modify_field (gdb_byte *addr, LONGEST fieldval, int bitpos, int bitsize)
+modify_field (struct type *type, gdb_byte *addr,
+ LONGEST fieldval, int bitpos, int bitsize)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
ULONGEST oword;
ULONGEST mask = (ULONGEST) -1 >> (8 * sizeof (ULONGEST) - bitsize);
fieldval &= mask;
}
- oword = extract_unsigned_integer (addr, sizeof oword);
+ oword = extract_unsigned_integer (addr, sizeof oword, byte_order);
/* Shifting for bit field depends on endianness of the target machine. */
- if (gdbarch_bits_big_endian (current_gdbarch))
+ if (gdbarch_bits_big_endian (get_type_arch (type)))
bitpos = sizeof (oword) * 8 - bitpos - bitsize;
oword &= ~(mask << bitpos);
oword |= fieldval << bitpos;
- store_unsigned_integer (addr, sizeof oword, oword);
+ store_unsigned_integer (addr, sizeof oword, byte_order, oword);
}
\f
/* Pack NUM into BUF using a target format of TYPE. */
void
pack_long (gdb_byte *buf, struct type *type, LONGEST num)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
int len;
type = check_typedef (type);
case TYPE_CODE_BOOL:
case TYPE_CODE_RANGE:
case TYPE_CODE_MEMBERPTR:
- store_signed_integer (buf, len, num);
+ store_signed_integer (buf, len, byte_order, num);
break;
case TYPE_CODE_REF:
value_from_pointer (struct type *type, CORE_ADDR addr)
{
struct value *val = allocate_value (type);
- store_typed_address (value_contents_raw (val), type, addr);
+ store_typed_address (value_contents_raw (val), check_typedef (type), addr);
return val;
}
-/* Create a value for a string constant to be stored locally
- (not in the inferior's memory space, but in GDB memory).
- This is analogous to value_from_longest, which also does not
- use inferior memory. String shall NOT contain embedded nulls. */
-
-struct value *
-value_from_string (char *ptr)
-{
- struct value *val;
- int len = strlen (ptr);
- int lowbound = current_language->string_lower_bound;
- struct type *string_char_type;
- struct type *rangetype;
- struct type *stringtype;
-
- rangetype = create_range_type ((struct type *) NULL,
- builtin_type_int32,
- lowbound, len + lowbound - 1);
- string_char_type = language_string_char_type (current_language,
- current_gdbarch);
- stringtype = create_array_type ((struct type *) NULL,
- string_char_type,
- rangetype);
- val = allocate_value (stringtype);
- memcpy (value_contents_raw (val), ptr, len);
- return val;
-}
-
/* Create a value of type TYPE whose contents come from VALADDR, if it
is non-null, and whose memory address (in the inferior) is
ADDRESS. */
add_prefix_cmd ("function", no_class, function_command, _("\
Placeholder command for showing help on convenience functions."),
&functionlist, "function ", 0, &cmdlist);
-
- internal_fn_type = alloc_type (NULL);
- TYPE_CODE (internal_fn_type) = TYPE_CODE_INTERNAL_FUNCTION;
- TYPE_NAME (internal_fn_type) = "<internal function>";
}
projects / deliverable / binutils-gdb.git / blobdiff