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Similarly to the is_implicit_ptr_at method, the existing function
callback interface of the computed struct value, requiers a way to
apply indirection to an implicit pointer on a given offset of a given
length of an underlying location description.
This is different than reading from a struct value object (previously
described write_to_gdb_value method) in a way that the result of this
operation is expected to be a struct value of a pointed source level
variable instead of reading the value of that variable.
In the same way this is also different operation than the deref method
because the deref returns a read value of a given type from that
location description.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_location::indirect_implicit_ptr):
New method.
(dwarf_implicit_pointer::indirect_implicit_ptr): New method.
(dwarf_composite::indirect_implicit_ptr): New method.
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