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"
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)
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));
+ struct type *array_type
+ = lookup_array_range_type (type, low_bound, count + low_bound - 1);
+ return allocate_value (array_type);
}
/* Needed if another module needs to maintain its on list of values. */
{
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,
- /* 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;
+ /* 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 a simple scalar value. */
+ INTERNALVAR_SCALAR,
+
+ /* 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;
+
+ /* A scalar value used with INTERNALVAR_SCALAR. */
+ 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;
+ union
+ {
+ LONGEST l; /* Used with TYPE_CODE_INT and NULL types. */
+ CORE_ADDR a; /* Used with TYPE_CODE_PTR types. */
+ } val;
+ } scalar;
+
+ /* 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_SCALAR:
+ if (!var->u.scalar.type)
+ val = value_from_longest (builtin_type (gdbarch)->builtin_int,
+ var->u.scalar.val.l);
+ else if (TYPE_CODE (var->u.scalar.type) == TYPE_CODE_INT)
+ val = value_from_longest (var->u.scalar.type, var->u.scalar.val.l);
+ else if (TYPE_CODE (var->u.scalar.type) == TYPE_CODE_PTR)
+ val = value_from_pointer (var->u.scalar.type, var->u.scalar.val.a);
+ else
+ internal_error (__FILE__, __LINE__, "bad type");
+ break;
- default:
- val = value_copy (var->u.v);
- 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;
- return 1;
+ case INTERNALVAR_SCALAR:
+ if (var->u.scalar.type == NULL
+ || TYPE_CODE (var->u.scalar.type) == TYPE_CODE_INT)
+ {
+ *result = var->u.scalar.val.l;
+ return 1;
+ }
+ /* Fall through. */
default:
return 0;
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_SCALAR;
+ new_data.scalar.type = value_type (val);
+ new_data.scalar.val.l = value_as_long (val);
break;
case TYPE_CODE_PTR:
- new_data.a = value_as_address (val);
+ new_kind = INTERNALVAR_SCALAR;
+ new_data.scalar.type = value_type (val);
+ new_data.scalar.val.a = 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_SCALAR;
+ var->u.scalar.type = NULL;
+ var->u.scalar.val.l = 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);
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_SCALAR:
+ if (var->u.scalar.type && TYPE_OBJFILE (var->u.scalar.type) == objfile)
+ var->u.scalar.type
+ = copy_type_recursive (objfile, var->u.scalar.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;
-
- default:
- preserve_one_value (var->u.v, objfile, copied_types);
- break;
- }
- }
+ preserve_one_internalvar (var, objfile, copied_types);
for (val = values_in_python; val; val = val->next)
preserve_one_value (val, objfile, 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. */
LONGEST
unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
ULONGEST val;
ULONGEST valmask;
int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
int lsbcount;
struct type *field_type;
- val = extract_unsigned_integer (valaddr + bitpos / 8, sizeof (val));
+ val = extract_unsigned_integer (valaddr + bitpos / 8,
+ sizeof (val), byte_order);
field_type = TYPE_FIELD_TYPE (type, fieldno);
CHECK_TYPEDEF (field_type);
/* Extract bits. See comment above. */
- if (gdbarch_bits_big_endian (current_gdbarch))
+ if (gdbarch_bits_big_endian (get_type_arch (type)))
lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize);
else
lsbcount = (bitpos % 8);
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:
}
-/* 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