Target applications will now be able to mark any region of memory as defined by simply invoking the macro MEMCLIENT_MARK_MEM_DEFINED_IF_ADDRESSABLE(). To implement the corresponding functionality in memclient, the client developer creates a handler function having the same signature as the annotation function and registers it for the annotation using dr_annotation_register_call(). For example:

#include "dr_api.h"
void handle_mark_mem_defined_if_addressable(void *p, size_t size)
{
    size_t *skip_size = dr_global_alloc(sizeof(size_t));
    hashtable_add_replace(skip_init_check_table, p, skip_size);
}
DR_EXPORT void
dr_client_main(client_id_t id, int argc, const char *argv[])
{
    dr_annotation_register_call("memclient_mark_mem_defined_if_addressable",
                                handle_mark_mem_defined_if_addressable, false, 2);
}

After registering the handler, all instances of the new annotation will be transformed into a clean call to handle_mark_mem_defined_if_addressable(), where the arguments to the annotation macro become arguments to the clean call.

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