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libdrgn: add drgn_object_read_integer()

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There are some cases where we want to read an integer regardless of its
signedness, so drgn_object_read_signed() and drgn_object_read_unsigned()
are cumbersome to use, and drgn_object_read_value() is too permissive.
This commit is contained in:
Omar Sandoval 2019-10-28 13:00:11 -07:00
parent 97b5967c37
commit b5735de8dc
2 changed files with 34 additions and 0 deletions
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14
libdrgn/drgn.h.in
View File

@ -1945,6 +1945,20 @@ struct drgn_error *drgn_object_read_signed(const struct drgn_object *obj,
struct drgn_error *drgn_object_read_unsigned(const struct drgn_object *obj,
uint64_t *ret);
/**
* Get the value of an object with kind @ref
* drgn_object_kind::DRGN_OBJECT_SIGNED or @ref
* drgn_object_kind::DRGN_OBJECT_UNSIGNED.
*
* If the object is not an integer, an error is returned.
*
* @param[in] obj Object to read.
* @param[out] ret Returned value.
* @return @c NULL on success, non-@c NULL on error.
*/
struct drgn_error *drgn_object_read_integer(const struct drgn_object *obj,
union drgn_value *ret);
/**
* Get the value of an object with kind @ref
* drgn_object_kind::DRGN_OBJECT_FLOAT.

20
libdrgn/object.c
View File

@ -737,6 +737,26 @@ drgn_object_read_unsigned(const struct drgn_object *obj, uint64_t *ret)
return drgn_object_value_unsigned(obj, ret);
}
LIBDRGN_PUBLIC struct drgn_error *
drgn_object_read_integer(const struct drgn_object *obj, union drgn_value *ret)
{
struct drgn_error *err;
union drgn_value value_mem;
const union drgn_value *value;
if (obj->kind != DRGN_OBJECT_SIGNED &&
obj->kind != DRGN_OBJECT_UNSIGNED) {
return drgn_error_create(DRGN_ERROR_TYPE,
"not an integer");
}
err = drgn_object_read_value(obj, &value_mem, &value);
if (err)
return err;
*ret = *value;
drgn_object_deinit_value(obj, value);
return NULL;
}
LIBDRGN_PUBLIC struct drgn_error *
drgn_object_read_float(const struct drgn_object *obj, double *ret)
{