HelenOS sources

root/uspace/app/sbi/src/tdata.c

DEFINITIONS

1. tdata_is_csi_derived_from_ti
2. tdata_is_ti_derived_from_ti
3. tdata_item_equal
4. tdata_item_subst
5. tdata_item_subst_tprimitive
6. tdata_item_subst_tobject
7. tdata_item_subst_tarray
8. tdata_item_subst_tdeleg
9. tdata_item_subst_tebase
10. tdata_item_subst_tenum
11. tdata_item_subst_tfun
12. tdata_item_subst_tvref
13. tdata_item_subst_fun_sig
14. tdata_item_print
15. tdata_tprimitive_print
16. tdata_tobject_print
17. tdata_tarray_print
18. tdata_tdeleg_print
19. tdata_tebase_print
20. tdata_tenum_print
21. tdata_tfun_print
22. tdata_tvref_print
23. tdata_item_new
24. tdata_array_new
25. tdata_object_new
26. tdata_primitive_new
27. tdata_deleg_new
28. tdata_ebase_new
29. tdata_enum_new
30. tdata_fun_new
31. tdata_vref_new
32. tdata_fun_sig_new
33. tdata_tvv_new
34. tdata_tvv_get_val
35. tdata_tvv_set_val

/*
 * Copyright (c) 2010 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @file Run-time data representation. */

#include <stdlib.h>
#include <assert.h>
#include "intmap.h"
#include "list.h"
#include "mytypes.h"
#include "stree.h"
#include "strtab.h"
#include "symbol.h"

#include "tdata.h"

static void tdata_item_subst_tprimitive(tdata_primitive_t *torig,
    tdata_tvv_t *tvv, tdata_item_t **res);
static void tdata_item_subst_tobject(tdata_object_t *torig, tdata_tvv_t *tvv,
    tdata_item_t **res);
static void tdata_item_subst_tarray(tdata_array_t *torig, tdata_tvv_t *tvv,
    tdata_item_t **res);
static void tdata_item_subst_tdeleg(tdata_deleg_t *torig,
    tdata_tvv_t *tvv, tdata_item_t **res);
static void tdata_item_subst_tebase(tdata_ebase_t *tebase,
    tdata_tvv_t *tvv, tdata_item_t **res);
static void tdata_item_subst_tenum(tdata_enum_t *tenum,
    tdata_tvv_t *tvv, tdata_item_t **res);
static void tdata_item_subst_tfun(tdata_fun_t *torig,
    tdata_tvv_t *tvv, tdata_item_t **res);
static void tdata_item_subst_tvref(tdata_vref_t *tvref, tdata_tvv_t *tvv,
    tdata_item_t **res);

static void tdata_item_subst_fun_sig(tdata_fun_sig_t *torig, tdata_tvv_t *tvv,
    tdata_fun_sig_t **res);

static void tdata_tprimitive_print(tdata_primitive_t *tprimitive);
static void tdata_tobject_print(tdata_object_t *tobject);
static void tdata_tarray_print(tdata_array_t *tarray);
static void tdata_tdeleg_print(tdata_deleg_t *tdeleg);
static void tdata_tebase_print(tdata_ebase_t *tebase);
static void tdata_tenum_print(tdata_enum_t *tenum);
static void tdata_tfun_print(tdata_fun_t *tfun);
static void tdata_tvref_print(tdata_vref_t *tvref);

/** Determine if CSI @a a is derived from CSI described by type item @a tb.
 *
 * XXX This won't work with generics.
 *
 * @param a     Potential derived CSI.
 * @param tb    Type of potentail base CSI.
 */
bool_t tdata_is_csi_derived_from_ti(stree_csi_t *a, tdata_item_t *tb)
{
        bool_t res;

        switch (tb->tic) {
        case tic_tobject:
                res = stree_is_csi_derived_from_csi(a, tb->u.tobject->csi);
                break;
        default:
                printf("Error: Base type is not a CSI.\n");
                exit(1);
        }

        return res;
}

/**
 * Determine if CSI described by type item @a a is derived from CSI described
 * by type item @a tb.
 *
 * XXX This is somewhat complementary to stype_convert(). It is used for
 * the explicit @c as conversion. It should only work for objects and only
 * allow conversion from base to derived types. We might want to scrap this
 * for a version specific to @c as. The current code does not work with
 * generics.
 *
 * @param a     Potential derived CSI.
 * @param tb    Type of potentail base CSI.
 */
bool_t tdata_is_ti_derived_from_ti(tdata_item_t *ta, tdata_item_t *tb)
{
        bool_t res;

        switch (ta->tic) {
        case tic_tobject:
                res = tdata_is_csi_derived_from_ti(ta->u.tobject->csi, tb);
                break;
        default:
                printf("Error: Derived type is not a CSI.\n");
                exit(1);
        }

        return res;
}

/** Determine if two type items are equal (i.e. describe the same type).
 *
 * Needed to check compatibility of type arguments in which a parametrized
 * type is not monotonous.
 *
 * @param a     Type item
 * @param b     Type item
 * @return      @c b_true if equal, @c b_false if not.
 */
bool_t tdata_item_equal(tdata_item_t *a, tdata_item_t *b)
{
        /*
         * Special case: Nil vs. object
         *
         * XXX Type of @c Nil should probably be @c object to avoid this
         * madness.
         */
        if (a->tic == tic_tprimitive && a->u.tprimitive->tpc == tpc_nil) {
                if (b->tic == tic_tobject)
                        return b_true;
        } else if (b->tic == tic_tprimitive && b->u.tprimitive->tpc == tpc_nil) {
                if (a->tic == tic_tobject)
                        return b_true;
        }

        if (a->tic != b->tic)
                return b_false;

        switch (a->tic) {
        case tic_tprimitive:
                /* Check if both have the same tprimitive class. */
                return (a->u.tprimitive->tpc == b->u.tprimitive->tpc);
        case tic_tobject:
                /* Check if both use the same CSI definition. */
                return (a->u.tobject->csi == b->u.tobject->csi);
        case tic_tarray:
                /* Compare rank and base type. */
                if (a->u.tarray->rank != b->u.tarray->rank)
                        return b_false;

                return tdata_item_equal(a->u.tarray->base_ti,
                    b->u.tarray->base_ti);
        case tic_tenum:
                /* Check if both use the same enum definition. */
                return (a->u.tenum->enum_d == b->u.tenum->enum_d);
        case tic_tvref:
                /* Check if both refer to the same type argument. */
                return (a->u.tvref->targ == b->u.tvref->targ);
        default:
                printf("Warning: Unimplemented: Compare types '");
                tdata_item_print(a);
                printf("' and '");
                tdata_item_print(b);
                printf("'.\n");
                return b_true;
        }
}

/** Substitute type variables in a type item.
 *
 * This is the second part of generic type application. In the first part
 * obtained a TVV using stype_titem_to_tvv() and in this second part we
 * actually substitute type variables in a type item for their values.
 * @a tvv must contain all variables referenced in @a ti.
 *
 * @param ti    Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
void tdata_item_subst(tdata_item_t *ti, tdata_tvv_t *tvv, tdata_item_t **res)
{
        switch (ti->tic) {
        case tic_tprimitive:
                tdata_item_subst_tprimitive(ti->u.tprimitive, tvv, res);
                break;
        case tic_tobject:
                tdata_item_subst_tobject(ti->u.tobject, tvv, res);
                break;
        case tic_tarray:
                tdata_item_subst_tarray(ti->u.tarray, tvv, res);
                break;
        case tic_tdeleg:
                tdata_item_subst_tdeleg(ti->u.tdeleg, tvv, res);
                break;
        case tic_tebase:
                tdata_item_subst_tebase(ti->u.tebase, tvv, res);
                break;
        case tic_tenum:
                tdata_item_subst_tenum(ti->u.tenum, tvv, res);
                break;
        case tic_tfun:
                tdata_item_subst_tfun(ti->u.tfun, tvv, res);
                break;
        case tic_tvref:
                tdata_item_subst_tvref(ti->u.tvref, tvv, res);
                break;
        case tic_ignore:
                *res = tdata_item_new(tic_ignore);
        }
}

/** Substitute type variables in a primitive type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tprimitive(tdata_primitive_t *torig,
    tdata_tvv_t *tvv, tdata_item_t **res)
{
        tdata_primitive_t *tnew;

        (void) tvv;

        /* Plain copy */
        tnew = tdata_primitive_new(torig->tpc);
        *res = tdata_item_new(tic_tprimitive);
        (*res)->u.tprimitive = tnew;
}

/** Substitute type variables in an object type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tobject(tdata_object_t *torig, tdata_tvv_t *tvv,
    tdata_item_t **res)
{
        tdata_object_t *tnew;
        list_node_t *targ_n;
        tdata_item_t *targ;
        tdata_item_t *new_targ;

        /* Copy static ref flag and base CSI. */
        tnew = tdata_object_new();
        tnew->static_ref = torig->static_ref;
        tnew->csi = torig->csi;
        list_init(&tnew->targs);

        /* Substitute arguments */
        targ_n = list_first(&torig->targs);
        while (targ_n != NULL) {
                targ = list_node_data(targ_n, tdata_item_t *);
                tdata_item_subst(targ, tvv, &new_targ);
                list_append(&tnew->targs, new_targ);

                targ_n = list_next(&torig->targs, targ_n);
        }

        *res = tdata_item_new(tic_tobject);
        (*res)->u.tobject = tnew;
}

/** Substitute type variables in an array type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tarray(tdata_array_t *torig, tdata_tvv_t *tvv,
    tdata_item_t **res)
{
        tdata_array_t *tnew;
        list_node_t *ext_n;
        stree_expr_t *extent;

        tnew = tdata_array_new();

        /* Substitute base type */
        tdata_item_subst(torig->base_ti, tvv, &tnew->base_ti);

        /* Copy rank and extents */
        tnew->rank = torig->rank;
        list_init(&tnew->extents);

        ext_n = list_first(&torig->extents);
        while (ext_n != NULL) {
                extent = list_node_data(ext_n, stree_expr_t *);
                list_append(&tnew->extents, extent);

                ext_n = list_next(&tnew->extents, ext_n);
        }

        *res = tdata_item_new(tic_tarray);
        (*res)->u.tarray = tnew;
}

/** Substitute type variables in a delegate type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tdeleg(tdata_deleg_t *torig, tdata_tvv_t *tvv,
    tdata_item_t **res)
{
        tdata_deleg_t *tnew;

        tnew = tdata_deleg_new();
        tnew->deleg = torig->deleg;
        tdata_item_subst_fun_sig(torig->tsig, tvv, &tnew->tsig);

        *res = tdata_item_new(tic_tdeleg);
        (*res)->u.tdeleg = tnew;
}

/** Substitute type variables in a enum-base type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tebase(tdata_ebase_t *tebase,
    tdata_tvv_t *tvv, tdata_item_t **res)
{
        tdata_ebase_t *tnew;

        (void) tvv;

        /* Plain copy */
        tnew = tdata_ebase_new();
        tnew->enum_d = tebase->enum_d;

        *res = tdata_item_new(tic_tebase);
        (*res)->u.tebase = tnew;
}

/** Substitute type variables in a enum type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tenum(tdata_enum_t *tenum,
    tdata_tvv_t *tvv, tdata_item_t **res)
{
        tdata_enum_t *tnew;

        (void) tvv;

        /* Plain copy */
        tnew = tdata_enum_new();
        tnew->enum_d = tenum->enum_d;

        *res = tdata_item_new(tic_tenum);
        (*res)->u.tenum = tnew;
}

/** Substitute type variables in a functional type item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tfun(tdata_fun_t *torig, tdata_tvv_t *tvv,
    tdata_item_t **res)
{
        tdata_fun_t *tnew;

        tnew = tdata_fun_new();
        tdata_item_subst_fun_sig(torig->tsig, tvv, &tnew->tsig);

        *res = tdata_item_new(tic_tfun);
        (*res)->u.tfun = tnew;
}

/** Substitute type variables in a type-variable reference item.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_tvref(tdata_vref_t *tvref, tdata_tvv_t *tvv,
    tdata_item_t **res)
{
        tdata_item_t *ti_new;

        ti_new = tdata_tvv_get_val(tvv, tvref->targ->name->sid);
        assert(ti_new != NULL);

        /* XXX Might be better to clone here. */
        *res = ti_new;
}

/** Substitute type variables in a function signature type fragment.
 *
 * @param torig Type item to substitute into.
 * @param tvv   Type variable valuation (values of type variables).
 * @param res   Place to store pointer to new type item.
 */
static void tdata_item_subst_fun_sig(tdata_fun_sig_t *torig, tdata_tvv_t *tvv,
    tdata_fun_sig_t **res)
{
        tdata_fun_sig_t *tnew;
        list_node_t *arg_n;
        tdata_item_t *arg_ti;
        tdata_item_t *narg_ti = NULL;

        tnew = tdata_fun_sig_new();

        /* Substitute type of each argument */
        list_init(&tnew->arg_ti);
        arg_n = list_first(&torig->arg_ti);
        while (arg_n != NULL) {
                arg_ti = list_node_data(arg_n, tdata_item_t *);

                /* XXX Because of overloaded Builtin.WriteLine */
                if (arg_ti == NULL)
                        narg_ti = NULL;
                else
                        tdata_item_subst(arg_ti, tvv, &narg_ti);

                list_append(&tnew->arg_ti, narg_ti);

                arg_n = list_next(&torig->arg_ti, arg_n);
        }

        /* Substitute type of variadic argument */
        if (torig->varg_ti != NULL)
                tdata_item_subst(torig->varg_ti, tvv, &tnew->varg_ti);

        /* Substitute return type */
        if (torig->rtype != NULL)
                tdata_item_subst(torig->rtype, tvv, &tnew->rtype);

        *res = tnew;
}

/** Print type item.
 *
 * @param titem Type item
 */
void tdata_item_print(tdata_item_t *titem)
{
        if (titem == NULL) {
                printf("none");
                return;
        }

        switch (titem->tic) {
        case tic_tprimitive:
                tdata_tprimitive_print(titem->u.tprimitive);
                break;
        case tic_tobject:
                tdata_tobject_print(titem->u.tobject);
                break;
        case tic_tarray:
                tdata_tarray_print(titem->u.tarray);
                break;
        case tic_tdeleg:
                tdata_tdeleg_print(titem->u.tdeleg);
                break;
        case tic_tebase:
                tdata_tebase_print(titem->u.tebase);
                break;
        case tic_tenum:
                tdata_tenum_print(titem->u.tenum);
                break;
        case tic_tfun:
                tdata_tfun_print(titem->u.tfun);
                break;
        case tic_tvref:
                tdata_tvref_print(titem->u.tvref);
                break;
        case tic_ignore:
                printf("ignore");
                break;
        }
}

/** Print primitive type item.
 *
 * @param tprimitive    Primitive type item
 */
static void tdata_tprimitive_print(tdata_primitive_t *tprimitive)
{
        switch (tprimitive->tpc) {
        case tpc_bool:
                printf("bool");
                break;
        case tpc_char:
                printf("char");
                break;
        case tpc_int:
                printf("int");
                break;
        case tpc_nil:
                printf("nil");
                break;
        case tpc_string:
                printf("string");
                break;
        case tpc_resource:
                printf("resource");
                break;
        }
}

/** Print object type item.
 *
 * @param tobject       Object type item
 */
static void tdata_tobject_print(tdata_object_t *tobject)
{
        stree_symbol_t *csi_sym;
        list_node_t *arg_n;
        tdata_item_t *arg;

        csi_sym = csi_to_symbol(tobject->csi);
        assert(csi_sym != NULL);
        symbol_print_fqn(csi_sym);

        arg_n = list_first(&tobject->targs);
        while (arg_n != NULL) {
                arg = list_node_data(arg_n, tdata_item_t *);
                putchar('/');
                tdata_item_print(arg);
                arg_n = list_next(&tobject->targs, arg_n);
        }
}

/** Print array type item.
 *
 * @param tarray        Array type item
 */
static void tdata_tarray_print(tdata_array_t *tarray)
{
        int i;

        tdata_item_print(tarray->base_ti);

        printf("[");
        for (i = 0; i < tarray->rank - 1; ++i)
                printf(",");
        printf("]");
}

/** Print delegate type item.
 *
 * @param tdeleg        Delegate type item
 */
static void tdata_tdeleg_print(tdata_deleg_t *tdeleg)
{
        stree_symbol_t *deleg_sym;

        deleg_sym = deleg_to_symbol(tdeleg->deleg);
        symbol_print_fqn(deleg_sym);
}

/** Print enum-base type item.
 *
 * @param tebase                Enum-base type item
 */
static void tdata_tebase_print(tdata_ebase_t *tebase)
{
        stree_symbol_t *enum_sym;

        enum_sym = enum_to_symbol(tebase->enum_d);

        printf("typeref(");
        symbol_print_fqn(enum_sym);
        printf(")");
}

/** Print enum type item.
 *
 * @param tenum         Enum type item
 */
static void tdata_tenum_print(tdata_enum_t *tenum)
{
        stree_symbol_t *enum_sym;

        enum_sym = enum_to_symbol(tenum->enum_d);
        symbol_print_fqn(enum_sym);
}

/** Print function type item.
 *
 * @param tfun          Function type item
 */
static void tdata_tfun_print(tdata_fun_t *tfun)
{
        list_node_t *arg_n;
        tdata_item_t *arg_ti;
        bool_t first;

        printf("fun(");

        arg_n = list_first(&tfun->tsig->arg_ti);
        first = b_true;
        while (arg_n != NULL) {
                if (first == b_false)
                        printf("; ");
                else
                        first = b_false;

                arg_ti = list_node_data(arg_n, tdata_item_t *);
                tdata_item_print(arg_ti);

                arg_n = list_next(&tfun->tsig->arg_ti, arg_n);
        }

        printf(") : ");
        tdata_item_print(tfun->tsig->rtype);
}

/** Print type variable reference type item.
 *
 * @param tvref         Type variable reference type item
 */
static void tdata_tvref_print(tdata_vref_t *tvref)
{
        printf("%s", strtab_get_str(tvref->targ->name->sid));
}

/** Allocate new type item.
 *
 * @param tic   Type item class
 * @return      New type item
 */
tdata_item_t *tdata_item_new(titem_class_t tic)
{
        tdata_item_t *titem;

        titem = calloc(1, sizeof(tdata_item_t));
        if (titem == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        titem->tic = tic;
        return titem;
}

/** Allocate new array type item.
 *
 * @return      New array type item
 */
tdata_array_t *tdata_array_new(void)
{
        tdata_array_t *tarray;

        tarray = calloc(1, sizeof(tdata_array_t));
        if (tarray == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tarray;
}

/** Allocate new object type item.
 *
 * @return      New object type item
 */
tdata_object_t *tdata_object_new(void)
{
        tdata_object_t *tobject;

        tobject = calloc(1, sizeof(tdata_object_t));
        if (tobject == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tobject;
}

/** Allocate new primitive type item.
 *
 * @return      New primitive type item
 */
tdata_primitive_t *tdata_primitive_new(tprimitive_class_t tpc)
{
        tdata_primitive_t *tprimitive;

        tprimitive = calloc(1, sizeof(tdata_primitive_t));
        if (tprimitive == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        tprimitive->tpc = tpc;
        return tprimitive;
}

/** Allocate new delegate type item.
 *
 * @return      New function type item
 */
tdata_deleg_t *tdata_deleg_new(void)
{
        tdata_deleg_t *tdeleg;

        tdeleg = calloc(1, sizeof(tdata_deleg_t));
        if (tdeleg == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tdeleg;
}

/** Allocate new enum-base type item.
 *
 * @return      New enum type item
 */
tdata_ebase_t *tdata_ebase_new(void)
{
        tdata_ebase_t *tebase;

        tebase = calloc(1, sizeof(tdata_ebase_t));
        if (tebase == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tebase;
}

/** Allocate new enum type item.
 *
 * @return      New enum type item
 */
tdata_enum_t *tdata_enum_new(void)
{
        tdata_enum_t *tenum;

        tenum = calloc(1, sizeof(tdata_enum_t));
        if (tenum == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tenum;
}

/** Allocate new functional type item.
 *
 * @return      New function type item
 */
tdata_fun_t *tdata_fun_new(void)
{
        tdata_fun_t *tfun;

        tfun = calloc(1, sizeof(tdata_fun_t));
        if (tfun == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tfun;
}

/** Allocate new type variable reference type item.
 *
 * @return      New type variable reference type item
 */
tdata_vref_t *tdata_vref_new(void)
{
        tdata_vref_t *tvref;

        tvref = calloc(1, sizeof(tdata_vref_t));
        if (tvref == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tvref;
}

/** Allocate new function signature type fragment.
 *
 * @return      New function signature type fragment
 */
tdata_fun_sig_t *tdata_fun_sig_new(void)
{
        tdata_fun_sig_t *tfun_sig;

        tfun_sig = calloc(1, sizeof(tdata_fun_sig_t));
        if (tfun_sig == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tfun_sig;
}

/** Create a new type variable valuation.
 *
 * @retrun      New type variable valuation
 */
tdata_tvv_t *tdata_tvv_new(void)
{
        tdata_tvv_t *tvv;

        tvv = calloc(1, sizeof(tdata_tvv_t));
        if (tvv == NULL) {
                printf("Memory allocation failed.\n");
                exit(1);
        }

        return tvv;
}

/** Get type variable value.
 *
 * Looks up value of the variable with name SID @a name in type
 * variable valuation @a tvv.
 *
 * @param tvv           Type variable valuation
 * @param name          Name of the variable (SID)
 * @return              Value of the type variable (type item) or @c NULL
 *                      if not defined in @a tvv
 */
tdata_item_t *tdata_tvv_get_val(tdata_tvv_t *tvv, sid_t name)
{
        return (tdata_item_t *)intmap_get(&tvv->tvv, name);
}

/** Set type variable value.
 *
 * Sets the value of variable with name SID @a name in type variable
 * valuation @a tvv to the value @a tvalue.
 *
 * @param tvv           Type variable valuation
 * @param name          Name of the variable (SID)
 * @param tvalue        Value to set (type item) or @c NULL to unset
 */
void tdata_tvv_set_val(tdata_tvv_t *tvv, sid_t name, tdata_item_t *tvalue)
{
        intmap_set(&tvv->tvv, name, tvalue);
}