#include "moar.h"

/* This representation's function pointer table. */

static const MVMREPROps NativeCall_this_repr;

/* Creates a new type object of this representation, and associates it with

 * the given HOW. Also sets the invocation protocol handler in the STable. */

static MVMObject * type_object_for(MVMThreadContext *tc, MVMObject *HOW) {

    MVMSTable *st = MVM_gc_allocate_stable(tc, &NativeCall_this_repr, HOW);

    MVMROOT(tc, st, {

        MVMObject *obj = MVM_gc_allocate_type_object(tc, st);

        MVM_ASSIGN_REF(tc, &(st->header), st->WHAT, obj);

        st->size = sizeof(MVMNativeCall);

    });

    return st->WHAT;

}

/* Copies the body of one object to another. */

static void copy_to(MVMThreadContext *tc, MVMSTable *st, void *src, MVMObject *dest_root, void *dest) {

    MVMNativeCallBody *src_body  = (MVMNativeCallBody *)src;

    MVMNativeCallBody *dest_body = (MVMNativeCallBody *)dest;

    /* Need a fresh handle for resource management purposes. */

    if (src_body->lib_name) {

        dest_body->lib_name = MVM_malloc(strlen(src_body->lib_name) + 1);

        strcpy(dest_body->lib_name, src_body->lib_name);

        dest_body->lib_handle = MVM_nativecall_load_lib(dest_body->lib_name);

    }

    /* Rest is just simple copying. */

    dest_body->entry_point = src_body->entry_point;

    dest_body->convention = src_body->convention;

    dest_body->num_args = src_body->num_args;

    if (src_body->arg_types) {

        dest_body->arg_types = MVM_malloc(sizeof(MVMint16) * (src_body->num_args ? src_body->num_args : 1));

        memcpy(dest_body->arg_types, src_body->arg_types, src_body->num_args * sizeof(MVMint16));

    }

    dest_body->ret_type = src_body->ret_type;

}

static const MVMStorageSpec storage_spec = {

    MVM_STORAGE_SPEC_INLINED,       /* inlineable */

    sizeof(MVMNativeCallBody) * 8,  /* bits */

    ALIGNOF(MVMNativeCallBody),     /* align */

    MVM_STORAGE_SPEC_BP_NONE,       /* boxed_primitive */

    0,                              /* can_box */

    0,                              /* is_unsigned */

};

/* Gets the storage specification for this representation. */

static const MVMStorageSpec * get_storage_spec(MVMThreadContext *tc, MVMSTable *st) {

    return &storage_spec;

}

/* We can't actually serialize the handle, but since this REPR gets inlined

 * we just do nothing here since it may well have never been opened. Various

 * more involved approaches are possible. */

static void serialize(MVMThreadContext *tc, MVMSTable *st, void *data, MVMSerializationWriter *writer) {

}

static void deserialize_stable_size(MVMThreadContext *tc, MVMSTable *st, MVMSerializationReader *reader) {

    st->size = sizeof(MVMNativeCall);

}

static void deserialize(MVMThreadContext *tc, MVMSTable *st, MVMObject *root, void *data, MVMSerializationReader *reader) {

}

static void gc_mark(MVMThreadContext *tc, MVMSTable *st, void *data, MVMGCWorklist *worklist) {

    MVMNativeCallBody *body = (MVMNativeCallBody *)data;

    if (body->arg_info) {

        MVMint16 i;

        for (i = 0; i < body->num_args; i++)

            if (body->arg_info[i])

                MVM_gc_worklist_add(tc, worklist, &body->arg_info[i]);

    }

}

static void gc_cleanup(MVMThreadContext *tc, MVMSTable *st, void *data) {

    MVMNativeCallBody *body = (MVMNativeCallBody *)data;

    if (body->lib_name)

        MVM_free(body->lib_name);

    if (body->lib_handle)

        MVM_nativecall_free_lib(body->lib_handle);

    if (body->arg_types)

        MVM_free(body->arg_types);

    if (body->arg_info)

        MVM_free(body->arg_info);

}

static void gc_free(MVMThreadContext *tc, MVMObject *obj) {

    gc_cleanup(tc, STABLE(obj), OBJECT_BODY(obj));

}

/* Compose the representation. */

static void compose(MVMThreadContext *tc, MVMSTable *st, MVMObject *info) {

    /* Nothing to do for this REPR. */

}

/* Initializes the representation. */

const MVMREPROps * MVMNativeCall_initialize(MVMThreadContext *tc) {

    return &NativeCall_this_repr;

}

static const MVMREPROps NativeCall_this_repr = {

    type_object_for,

    MVM_gc_allocate_object,

    NULL, /* initialize */

    copy_to,

    MVM_REPR_DEFAULT_ATTR_FUNCS,

    MVM_REPR_DEFAULT_BOX_FUNCS,

    MVM_REPR_DEFAULT_POS_FUNCS,

    MVM_REPR_DEFAULT_ASS_FUNCS,

    MVM_REPR_DEFAULT_ELEMS,

    get_storage_spec,

    NULL, /* change_type */

    serialize,

    deserialize,

    NULL, /* serialize_repr_data */

    NULL, /* deserialize_repr_data */

    deserialize_stable_size,

    gc_mark,

    gc_free,

    gc_cleanup,

    NULL, /* gc_mark_repr_data */

    NULL, /* gc_free_repr_data */

    compose,

    NULL, /* spesh */

    "NativeCall", /* name */

    MVM_REPR_ID_MVMNativeCall,

    NULL, /* unmanaged_size */

    NULL, /* describe_refs */

};