Good day and welcome to the FIRM XMALLOC*() macros. These macros are provided for...

[libfirm] / ir / tr / type.c

/*
 * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

/**
 * @file    type.c
 * @brief   Representation of types.
 * @author  Goetz Lindenmaier, Michael Beck
 * @version $Id$
 * @summary
 *
 *  Implementation of the datastructure to hold
 *  type information.
 *
 *  This module supplies a datastructure to represent all types
 *  known in the compiled program.  This includes types specified
 *  in the program as well as types defined by the language.  In the
 *  view of the intermediate representation there is no difference
 *  between these types.
 *
 *  There exist several kinds of types, arranged by the structure of
 *  the type.  A type is described by a set of attributes.  Some of
 *  these attributes are common to all types, others depend on the
 *  kind of the type.
 *
 *  Types are different from the modes defined in irmode:  Types are
 *  on the level of the programming language, modes at the level of
 *  the target processor.
 *
 * @see  type_t.h type tpop
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif

#include <stddef.h>

#include "type_t.h"

#include "xmalloc.h"
#include "irprog_t.h"
#include "ircons.h"
#include "tpop_t.h"
#include "tv_t.h"
#include "irhooks.h"
#include "irtools.h"
#include "entity_t.h"

#include "array.h"

/*-----------------------------------------------------------------*/
/** TYPE                                                          **/
/*-----------------------------------------------------------------*/

ir_type *firm_none_type;    ir_type *get_none_type(void)    { return firm_none_type;    }
ir_type *firm_unknown_type; ir_type *get_unknown_type(void) { return firm_unknown_type; }


/* Suffixes added to types used for pass-by-value representations. */
static ident *value_params_suffix = NULL;
static ident *value_ress_suffix = NULL;

/** The default calling convention for method types. */
static unsigned default_cc_mask;

/* return the default calling convention for method types */
unsigned get_default_cc_mask(void) {
        return default_cc_mask;
}

/* Initialize the type module. */
void firm_init_type(dbg_info *builtin_db, unsigned def_cc_mask) {
        default_cc_mask     = def_cc_mask;
        value_params_suffix = new_id_from_str(VALUE_PARAMS_SUFFIX);
        value_ress_suffix   = new_id_from_str(VALUE_RESS_SUFFIX);

        /* construct none and unknown type. */
        firm_none_type    = new_type(tpop_none,    mode_BAD, new_id_from_str("type_none"), builtin_db);
        set_type_size_bytes(firm_none_type, 0);
        set_type_state (firm_none_type, layout_fixed);
        remove_irp_type(firm_none_type);

        firm_unknown_type = new_type(tpop_unknown, mode_ANY, new_id_from_str("type_unknown"), builtin_db);
        set_type_size_bytes(firm_unknown_type, 0);
        set_type_state (firm_unknown_type, layout_fixed);
        remove_irp_type(firm_unknown_type);
}

/** the global type visited flag */
ir_visited_t firm_type_visited;

void (set_master_type_visited)(ir_visited_t val) { _set_master_type_visited(val); }
ir_visited_t (get_master_type_visited)(void)     { return _get_master_type_visited(); }
void (inc_master_type_visited)(void)             { _inc_master_type_visited(); }

/*
 * Creates a new type representation.
 */
ir_type *
new_type(tp_op *type_op, ir_mode *mode, ident *name, dbg_info *db) {
        ir_type *res;
        int node_size;

        assert(type_op != type_id);
        assert(!id_contains_char(name, ' ') && "type name should not contain spaces");

        node_size = offsetof(ir_type, attr) +  type_op->attr_size;
        res = xmalloc(node_size);
        memset(res, 0, node_size);

        res->kind       = k_type;
        res->type_op    = type_op;
        res->mode       = mode;
        res->name       = name;
        res->visibility = visibility_external_allocated;
        res->flags      = tf_none;
        res->size       = 0;
        res->align      = 0;
        res->visit      = 0;
        res->link       = NULL;
        res->dbi        = db;
        res->assoc_type = NULL;
#ifdef DEBUG_libfirm
        res->nr         = get_irp_new_node_nr();
#endif /* defined DEBUG_libfirm */

        add_irp_type(res);   /* Remember the new type global. */

        return res;
}

void free_type(ir_type *tp) {
        const tp_op *op = get_type_tpop(tp);

        if ((get_type_tpop(tp) == tpop_none) || (get_type_tpop(tp) == tpop_unknown))
                return;
        /* Remove from list of all types */
        remove_irp_type(tp);
        /* Free the attributes of the type. */
        free_type_attrs(tp);
        /* Free entities automatically allocated with the ir_type */
        if (op->ops.free_auto_entities)
                op->ops.free_auto_entities(tp);
        /* And now the type itself... */
        tp->kind = k_BAD;
        free(tp);
}

void free_type_entities(ir_type *tp) {
        const tp_op *tpop = get_type_tpop(tp);

        if (tpop->ops.free_entities)
                tpop->ops.free_entities(tp);
}

void free_type_attrs(ir_type *tp) {
        const tp_op *tpop = get_type_tpop(tp);

        if (tpop->ops.free_attrs)
                tpop->ops.free_attrs(tp);
}

/* set/get the link field */
void *(get_type_link)(const ir_type *tp) {
        return _get_type_link(tp);
}

void (set_type_link)(ir_type *tp, void *l) {
        _set_type_link(tp, l);
}

const tp_op *(get_type_tpop)(const ir_type *tp) {
        return _get_type_tpop(tp);
}

ident *(get_type_tpop_nameid)(const ir_type *tp) {
        return _get_type_tpop_nameid(tp);
}

const char* get_type_tpop_name(const ir_type *tp) {
        assert(tp && tp->kind == k_type);
        return get_id_str(tp->type_op->name);
}

tp_opcode (get_type_tpop_code)(const ir_type *tp) {
        return _get_type_tpop_code(tp);
}

ir_mode *(get_type_mode)(const ir_type *tp) {
        return _get_type_mode(tp);
}

void set_type_mode(ir_type *tp, ir_mode *mode) {
        const tp_op *tpop = get_type_tpop(tp);

        if (tpop->ops.set_type_mode)
                tpop->ops.set_type_mode(tp, mode);
        else
                assert(0 && "setting a mode is NOT allowed for this type");
}

ident *(get_type_ident)(const ir_type *tp) {
        return _get_type_ident(tp);
}

void (set_type_ident)(ir_type *tp, ident* id) {
        _set_type_ident(tp, id);
}

/* Outputs a unique number for this node */
long get_type_nr(const ir_type *tp) {
        assert(tp);
#ifdef DEBUG_libfirm
        return tp->nr;
#else
        return (long)PTR_TO_INT(tp);
#endif
}

const char *get_type_name(const ir_type *tp) {
        assert(tp && tp->kind == k_type);
        return (get_id_str(tp->name));
}

unsigned (get_type_size_bytes)(const ir_type *tp) {
        return _get_type_size_bytes(tp);
}

ir_visibility get_type_visibility(const ir_type *tp) {
#if 0
        visibility res =  visibility_local;
        if (is_compound_type(tp)) {

                if (is_Array_type(tp)) {
                        ir_entity *mem = get_array_element_entity(tp);
                        if (get_entity_visibility(mem) != visibility_local)
                                res = visibility_external_visible;
                } else {
                        int i, n_mems = get_compound_n_members(tp);
                        for (i = 0; i < n_mems; ++i) {
                                ir_entity *mem = get_compound_member(tp, i);
                                if (get_entity_visibility(mem) != visibility_local)
                                        res = visibility_external_visible;
                        }
                }
        }
        return res;
#endif
        assert(is_type(tp));
        return tp->visibility;
}

void set_type_visibility(ir_type *tp, ir_visibility v) {
        assert(is_type(tp));
#if 0
        /* check for correctness */
        if (v != visibility_external_allocated) {
                visibility res =  visibility_local;
                if (is_compound_type(tp)) {
                        if (is_Array_type(tp)) {
                                ir_entity *mem = get_array_element_entity(tp);
                                if (get_entity_visibility(mem) >  res)
                                        res = get_entity_visibility(mem);
                        } else {
                                int i, n_mems = get_compound_n_members(tp);
                                for (i = 0; i < n_mems; ++i) {
                                        ir_entity *mem = get_compound_member(tp, i);
                                        if (get_entity_visibility(mem) > res)
                                                res = get_entity_visibility(mem);
                                }
                        }
                }
                assert(res < v);
        }
#endif
        tp->visibility = v;
}

void
set_type_size_bytes(ir_type *tp, unsigned size) {
        const tp_op *tpop = get_type_tpop(tp);

        if (tpop->ops.set_type_size)
                tpop->ops.set_type_size(tp, size);
        else
                assert(0 && "Cannot set size for this type");
}

unsigned get_type_alignment_bytes(ir_type *tp) {
        unsigned align = 1;

        if (tp->align > 0)
                return tp->align;

        /* alignment NOT set calculate it "on demand" */
        if (tp->mode)
                align = (get_mode_size_bits(tp->mode) + 7) >> 3;
        else if (is_Array_type(tp))
                align = get_type_alignment_bytes(get_array_element_type(tp));
        else if (is_compound_type(tp)) {
                int i, n = get_compound_n_members(tp);

                align = 0;
                for (i = 0; i < n; ++i) {
                        ir_type  *t = get_entity_type(get_compound_member(tp, i));
                        unsigned a  = get_type_alignment_bytes(t);

                        if (a > align)
                                align = a;
                }
        } else if (is_Method_type(tp)) {
                align = 0;
        }

        /* write back */
        tp->align = align;

        return align;
}

void
set_type_alignment_bytes(ir_type *tp, unsigned align) {
        assert(tp && tp->kind == k_type);
        /* Methods don't have an alignment. */
        if (tp->type_op != type_method) {
                tp->align = align;
        }
}

/* Returns a human readable string for the enum entry. */
const char *get_type_state_name(ir_type_state s) {
#define X(a)    case a: return #a;
        switch (s) {
                X(layout_undefined);
                X(layout_fixed);
        }
        return "<unknown>";
#undef X
}


ir_type_state (get_type_state)(const ir_type *tp) {
        return _get_type_state(tp);
}

void
set_type_state(ir_type *tp, ir_type_state state) {
        assert(tp && tp->kind == k_type);

        if ((tp->type_op == type_pointer) || (tp->type_op == type_primitive) ||
                (tp->type_op == type_method))
                return;

        /* Just a correctness check: */
        if (state == layout_fixed) {
                int i;
                switch (get_type_tpop_code(tp)) {
                case tpo_class:
                        if (tp != get_glob_type()) {
                                int n_mem = get_class_n_members(tp);
                                for (i = 0; i < n_mem; i++) {
                                        assert(get_entity_offset(get_class_member(tp, i)) > -1);
                                        /* TR ??
                                        assert(is_Method_type(get_entity_type(get_class_member(tp, i))) ||
                                        (get_entity_allocation(get_class_member(tp, i)) == allocation_automatic));
                                        */
                                }
                        }
                        break;
                case tpo_struct:
                        for (i = 0; i < get_struct_n_members(tp); i++) {
                                assert(get_entity_offset(get_struct_member(tp, i)) > -1);
                                assert((get_entity_allocation(get_struct_member(tp, i)) == allocation_automatic));
                        }
                        break;
                case tpo_union:
                        /* ?? */
                        break;
                case tpo_array:
                        /* ??
                           Check order?
                           Assure that only innermost dimension is dynamic? */
                        break;
                case tpo_enumeration:
#ifndef NDEBUG
                        assert(get_type_mode != NULL);
                        for (i = get_enumeration_n_enums(tp) - 1; i >= 0; --i) {
                                ir_enum_const *ec = get_enumeration_const(tp, i);
                                tarval        *tv = get_enumeration_value(ec);
                                assert(tv != NULL && tv != tarval_bad);
                        }
#endif
                        break;
                default: break;
                } /* switch (tp) */
        }
        if (state == layout_fixed)
                tp->flags |= tf_layout_fixed;
        else
                tp->flags &= ~tf_layout_fixed;
}

ir_visited_t (get_type_visited)(const ir_type *tp) {
        return _get_type_visited(tp);
}

void (set_type_visited)(ir_type *tp, ir_visited_t num) {
        _set_type_visited(tp, num);
}

/* Sets visited field in type to type_visited. */
void (mark_type_visited)(ir_type *tp) {
        _mark_type_visited(tp);
}

int (type_visited)(const ir_type *tp) {
        return _type_visited(tp);
}

int (type_not_visited)(const ir_type *tp) {
        return _type_not_visited(tp);
}

dbg_info *(get_type_dbg_info)(const ir_type *tp) {
        return _get_type_dbg_info(tp);
}

void (set_type_dbg_info)(ir_type *tp, dbg_info *db) {
        _set_type_dbg_info(tp, db);
}

int (is_type)(const void *thing) {
  return _is_type(thing);
}

/* Checks whether two types are structural equal.*/
int equal_type(ir_type *typ1, ir_type *typ2) {
        ir_entity **m;
        ir_type **t;
        int i, j;

        if (typ1 == typ2) return 1;

        if ((get_type_tpop_code(typ1) != get_type_tpop_code(typ2)) ||
            (get_type_ident(typ1) != get_type_ident(typ2)) ||
            (get_type_mode(typ1) != get_type_mode(typ2)) ||
            (get_type_state(typ1) != get_type_state(typ2)))
                return 0;
        if ((get_type_state(typ1) == layout_fixed) &&
                (get_type_size_bytes(typ1) != get_type_size_bytes(typ2)))
                return 0;

        switch (get_type_tpop_code(typ1)) {
        case tpo_class:
                if (get_class_n_members(typ1) != get_class_n_members(typ2)) return 0;
                if (get_class_n_subtypes(typ1) != get_class_n_subtypes(typ2)) return 0;
                if (get_class_n_supertypes(typ1) != get_class_n_supertypes(typ2)) return 0;
                if (get_class_peculiarity(typ1) != get_class_peculiarity(typ2)) return 0;
                /** Compare the members **/
                m = alloca(sizeof(ir_entity *) * get_class_n_members(typ1));
                memset(m, 0, sizeof(ir_entity *) * get_class_n_members(typ1));
                /* First sort the members of typ2 */
                for (i = 0; i < get_class_n_members(typ1); i++) {
                        ir_entity *e1 = get_class_member(typ1, i);
                        for (j = 0; j < get_class_n_members(typ2); j++) {
                                ir_entity *e2 = get_class_member(typ2, j);
                                if (get_entity_name(e1) == get_entity_name(e2))
                                        m[i] = e2;
                        }
                }
                for (i = 0; i < get_class_n_members(typ1); i++) {
                        if (!m[i]  ||  /* Found no counterpart */
                                !equal_entity(get_class_member(typ1, i), m[i]))
                                return 0;
                }
                /** Compare the supertypes **/
                t = alloca(sizeof(ir_entity *) * get_class_n_supertypes(typ1));
                memset(t, 0, sizeof(ir_entity *) * get_class_n_supertypes(typ1));
                /* First sort the supertypes of typ2 */
                for (i = 0; i < get_class_n_supertypes(typ1); i++) {
                        ir_type *t1 = get_class_supertype(typ1, i);
                        for (j = 0; j < get_class_n_supertypes(typ2); j++) {
                                ir_type *t2 = get_class_supertype(typ2, j);
                                if (get_type_ident(t2) == get_type_ident(t1))
                                        t[i] = t2;
                        }
                }
                for (i = 0; i < get_class_n_supertypes(typ1); i++) {
                        if (!t[i]  ||  /* Found no counterpart */
                                get_class_supertype(typ1, i) != t[i])
                                return 0;
                }
                break;

        case tpo_struct:
                if (get_struct_n_members(typ1) != get_struct_n_members(typ2)) return 0;
                m = alloca(sizeof(ir_entity *) * get_struct_n_members(typ1));
                memset(m, 0, sizeof(ir_entity *) * get_struct_n_members(typ1));
                /* First sort the members of lt */
                for (i = 0; i < get_struct_n_members(typ1); i++) {
                        ir_entity *e1 = get_struct_member(typ1, i);
                        for (j = 0; j < get_struct_n_members(typ2); j++) {
                                ir_entity *e2 = get_struct_member(typ2, j);
                                if (get_entity_name(e1) == get_entity_name(e2))
                                        m[i] = e2;
                        }
                }
                for (i = 0; i < get_struct_n_members(typ1); i++) {
                        if (!m[i]  ||  /* Found no counterpart */
                                !equal_entity(get_struct_member(typ1, i), m[i]))
                                return 0;
                }
                break;

        case tpo_method: {
                int n_param1, n_param2;

                if (get_method_variadicity(typ1) != get_method_variadicity(typ2)) return 0;
                if (get_method_n_ress(typ1)      != get_method_n_ress(typ2)) return 0;
                if (get_method_calling_convention(typ1) !=
                    get_method_calling_convention(typ2)) return 0;

                if (get_method_variadicity(typ1) == variadicity_non_variadic) {
                        n_param1 = get_method_n_params(typ1);
                        n_param2 = get_method_n_params(typ2);
                } else {
                        n_param1 = get_method_first_variadic_param_index(typ1);
                        n_param2 = get_method_first_variadic_param_index(typ2);
                }

                if (n_param1 != n_param2) return 0;

                for (i = 0; i < n_param1; i++) {
                        if (!equal_type(get_method_param_type(typ1, i), get_method_param_type(typ2, i)))
                                return 0;
                }
                for (i = 0; i < get_method_n_ress(typ1); i++) {
                        if (!equal_type(get_method_res_type(typ1, i), get_method_res_type(typ2, i)))
                                return 0;
                }
        } break;

        case tpo_union:
                if (get_union_n_members(typ1) != get_union_n_members(typ2)) return 0;
                m = alloca(sizeof(ir_entity *) * get_union_n_members(typ1));
                memset(m, 0, sizeof(ir_entity *) * get_union_n_members(typ1));
                /* First sort the members of lt */
                for (i = 0; i < get_union_n_members(typ1); i++) {
                        ir_entity *e1 = get_union_member(typ1, i);
                        for (j = 0; j < get_union_n_members(typ2); j++) {
                                ir_entity *e2 = get_union_member(typ2, j);
                                if (get_entity_name(e1) == get_entity_name(e2))
                                        m[i] = e2;
                        }
                }
                for (i = 0; i < get_union_n_members(typ1); i++) {
                        if (!m[i]  ||  /* Found no counterpart */
                                !equal_entity(get_union_member(typ1, i), m[i]))
                                return 0;
                }
                break;

        case tpo_array:
                if (get_array_n_dimensions(typ1) != get_array_n_dimensions(typ2))
                        return 0;
                if (!equal_type(get_array_element_type(typ1), get_array_element_type(typ2)))
                        return 0;
                for(i = 0; i < get_array_n_dimensions(typ1); i++) {
                        if (get_array_lower_bound(typ1, i) != get_array_lower_bound(typ2, i) ||
                                get_array_upper_bound(typ1, i) != get_array_upper_bound(typ2, i))
                                return 0;
                        if (get_array_order(typ1, i) != get_array_order(typ2, i))
                                assert(0 && "type compare with different dimension orders not implemented");
                }
                break;

        case tpo_enumeration:
                assert(0 && "enumerations not implemented");
                break;

        case tpo_pointer:
                if (get_pointer_points_to_type(typ1) != get_pointer_points_to_type(typ2))
                        return 0;
                break;

        case tpo_primitive:
                break;

        default: break;
        }
        return 1;
}

/* Checks whether two types are structural comparable. */
int smaller_type(ir_type *st, ir_type *lt) {
        ir_entity **m;
        int i, j, n_st_members;

        if (st == lt) return 1;

        if (get_type_tpop_code(st) != get_type_tpop_code(lt))
                return 0;

        switch(get_type_tpop_code(st)) {
        case tpo_class:
                return is_SubClass_of(st, lt);

        case tpo_struct:
                n_st_members = get_struct_n_members(st);
                if (n_st_members != get_struct_n_members(lt))
                        return 0;

                m = alloca(sizeof(ir_entity *) * n_st_members);
                memset(m, 0, sizeof(ir_entity *) * n_st_members);
                /* First sort the members of lt */
                for (i = 0; i < n_st_members; ++i) {
                        ir_entity *se = get_struct_member(st, i);
                        int n = get_struct_n_members(lt);
                        for (j = 0; j < n; ++j) {
                                ir_entity *le = get_struct_member(lt, j);
                                if (get_entity_name(le) == get_entity_name(se))
                                        m[i] = le;
                        }
                }
                for (i = 0; i < n_st_members; i++) {
                        if (!m[i]  ||  /* Found no counterpart */
                            !smaller_type(get_entity_type(get_struct_member(st, i)), get_entity_type(m[i])))
                                return 0;
                }
                break;

        case tpo_method: {
                int n_param1, n_param2;

                /** FIXME: is this still 1? */
                if (get_method_variadicity(st) != get_method_variadicity(lt)) return 0;
                if (get_method_n_ress(st) != get_method_n_ress(lt)) return 0;
                if (get_method_calling_convention(st) !=
                    get_method_calling_convention(lt)) return 0;

                if (get_method_variadicity(st) == variadicity_non_variadic) {
                        n_param1 = get_method_n_params(st);
                        n_param2 = get_method_n_params(lt);
                } else {
                        n_param1 = get_method_first_variadic_param_index(st);
                        n_param2 = get_method_first_variadic_param_index(lt);
                }

                if (n_param1 != n_param2) return 0;

                for (i = 0; i < get_method_n_params(st); i++) {
                        if (!smaller_type(get_method_param_type(st, i), get_method_param_type(lt, i)))
                                return 0;
                }
                for (i = 0; i < get_method_n_ress(st); i++) {
                        if (!smaller_type(get_method_res_type(st, i), get_method_res_type(lt, i)))
                                return 0;
                }
        } break;

        case tpo_union:
                n_st_members = get_union_n_members(st);
                if (n_st_members != get_union_n_members(lt)) return 0;
                m = alloca(sizeof(ir_entity *) * n_st_members);
                memset(m, 0, sizeof(ir_entity *) * n_st_members);
                /* First sort the members of lt */
                for (i = 0; i < n_st_members; ++i) {
                        ir_entity *se = get_union_member(st, i);
                        int n = get_union_n_members(lt);
                        for (j = 0; j < n; ++j) {
                                ir_entity *le = get_union_member(lt, j);
                                if (get_entity_name(le) == get_entity_name(se))
                                        m[i] = le;
                        }
                }
                for (i = 0; i < n_st_members; ++i) {
                        if (!m[i]  ||  /* Found no counterpart */
                                !smaller_type(get_entity_type(get_union_member(st, i)), get_entity_type(m[i])))
                                return 0;
                }
                break;

        case tpo_array: {
                ir_type *set, *let;  /* small/large elt. ir_type */
                if (get_array_n_dimensions(st) != get_array_n_dimensions(lt))
                        return 0;
                set = get_array_element_type(st);
                let = get_array_element_type(lt);
                if (set != let) {
                        /* If the element types are different, set must be convertible
                           to let, and they must have the same size so that address
                           computations work out.  To have a size the layout must
                           be fixed. */
                        if ((get_type_state(set) != layout_fixed) ||
                            (get_type_state(let) != layout_fixed))
                                return 0;
                        if (!smaller_type(set, let) ||
                            get_type_size_bytes(set) != get_type_size_bytes(let))
                                return 0;
                }
                for(i = 0; i < get_array_n_dimensions(st); i++) {
                        if (get_array_lower_bound(lt, i))
                                if(get_array_lower_bound(st, i) != get_array_lower_bound(lt, i))
                                        return 0;
                                if (get_array_upper_bound(lt, i))
                                        if(get_array_upper_bound(st, i) != get_array_upper_bound(lt, i))
                                                return 0;
                }
        } break;

        case tpo_enumeration:
                assert(0 && "enumerations not implemented");
                break;

        case tpo_pointer:
                if (!smaller_type(get_pointer_points_to_type(st), get_pointer_points_to_type(lt)))
                        return 0;
                break;

        case tpo_primitive:
                if (!smaller_mode(get_type_mode(st), get_type_mode(lt)))
                        return 0;
                break;

        default: break;
        }
        return 1;
}

/*-----------------------------------------------------------------*/
/* TYPE_CLASS                                                      */
/*-----------------------------------------------------------------*/

/* create a new class ir_type */
ir_type *new_d_type_class (ident *name, dbg_info *db) {
        ir_type *res;

        res = new_type(type_class, NULL, name, db);

        res->attr.ca.members     = NEW_ARR_F (ir_entity *, 0);
        res->attr.ca.subtypes    = NEW_ARR_F (ir_type *, 0);
        res->attr.ca.supertypes  = NEW_ARR_F (ir_type *, 0);
        res->attr.ca.peculiarity = peculiarity_existent;
        res->attr.ca.type_info   = NULL;
        res->attr.ca.vtable_size = 0;
        res->attr.ca.clss_flags  = cf_none;
        res->attr.ca.dfn         = 0;
        hook_new_type(res);
        return res;
}

ir_type *new_type_class (ident *name) {
        return new_d_type_class (name, NULL);
}

/* free all entities of a class */
void free_class_entities(ir_type *clss) {
        int i;
        assert(clss && (clss->type_op == type_class));
        for (i = get_class_n_members(clss) - 1; i >= 0; --i)
                free_entity(get_class_member(clss, i));
        /* do NOT free the type info here. It belongs to another class */
}

void free_class_attrs(ir_type *clss) {
        assert(clss && (clss->type_op == type_class));
        DEL_ARR_F(clss->attr.ca.members);
        DEL_ARR_F(clss->attr.ca.subtypes);
        DEL_ARR_F(clss->attr.ca.supertypes);
}

/* manipulate private fields of class type  */
void add_class_member(ir_type *clss, ir_entity *member) {
        assert(clss && (clss->type_op == type_class));
        assert(clss != get_entity_type(member) && "recursive type");
        assert(get_type_state(clss) != layout_fixed);
        ARR_APP1 (ir_entity *, clss->attr.ca.members, member);
}

int (get_class_n_members)(const ir_type *clss) {
        return _get_class_n_members(clss);
}

int get_class_member_index(const ir_type *clss, ir_entity *mem) {
        int i, n;
        assert(clss && (clss->type_op == type_class));
        for (i = 0, n = get_class_n_members(clss); i < n; ++i)
                if (get_class_member(clss, i) == mem)
                        return i;
                return -1;
}

ir_entity *(get_class_member)(const ir_type *clss, int pos) {
        return _get_class_member(clss, pos);
}

ir_entity *get_class_member_by_name(ir_type *clss, ident *name) {
        int i, n_mem;
        assert(clss && (clss->type_op == type_class));
        n_mem = get_class_n_members(clss);
        for (i = 0; i < n_mem; ++i) {
                ir_entity *mem = get_class_member(clss, i);
                if (get_entity_ident(mem) == name) return mem;
        }
        return NULL;
}

void set_class_member(ir_type *clss, ir_entity *member, int pos) {
        assert(clss && (clss->type_op == type_class));
        assert(pos >= 0 && pos < get_class_n_members(clss));
        clss->attr.ca.members[pos] = member;
}

void set_class_members(ir_type *clss, ir_entity **members, int arity) {
        int i;
        assert(clss && (clss->type_op == type_class));
        DEL_ARR_F(clss->attr.ca.members);
        clss->attr.ca.members = NEW_ARR_F(ir_entity *, 0);
        for (i = 0; i < arity; ++i) {
                set_entity_owner(members[i], clss);
                ARR_APP1(ir_entity *, clss->attr.ca.members, members[i]);
        }
}

void remove_class_member(ir_type *clss, ir_entity *member) {
        int i;
        assert(clss && (clss->type_op == type_class));
        for (i = 0; i < (ARR_LEN (clss->attr.ca.members)); i++) {
                if (clss->attr.ca.members[i] == member) {
                        for (; i < (ARR_LEN (clss->attr.ca.members)) - 1; i++)
                                clss->attr.ca.members[i] = clss->attr.ca.members[i + 1];
                        ARR_SETLEN(ir_entity*, clss->attr.ca.members, ARR_LEN(clss->attr.ca.members) - 1);
                        break;
                }
        }
}

void add_class_subtype(ir_type *clss, ir_type *subtype) {
        int i;
        assert(clss && (clss->type_op == type_class));
        ARR_APP1 (ir_type *, clss->attr.ca.subtypes, subtype);
        for (i = 0; i < get_class_n_supertypes(subtype); i++)
                if (get_class_supertype(subtype, i) == clss)
                        /* Class already registered */
                        return;
                ARR_APP1(ir_type *, subtype->attr.ca.supertypes, clss);
}

int get_class_n_subtypes(const ir_type *clss) {
        assert(clss && (clss->type_op == type_class));
        return (ARR_LEN (clss->attr.ca.subtypes));
}

ir_type *get_class_subtype(ir_type *clss, int pos) {
        assert(clss && (clss->type_op == type_class));
        assert(pos >= 0 && pos < get_class_n_subtypes(clss));
        return clss->attr.ca.subtypes[pos] = skip_tid(clss->attr.ca.subtypes[pos]);
}

int get_class_subtype_index(ir_type *clss, const ir_type *subclass) {
        int i, n_subtypes = get_class_n_subtypes(clss);
        assert(is_Class_type(subclass));
        for (i = 0; i < n_subtypes; ++i) {
                if (get_class_subtype(clss, i) == subclass) return i;
        }
        return -1;
}

void set_class_subtype(ir_type *clss, ir_type *subtype, int pos) {
        assert(clss && (clss->type_op == type_class));
        assert(pos >= 0 && pos < get_class_n_subtypes(clss));
        clss->attr.ca.subtypes[pos] = subtype;
}

void remove_class_subtype(ir_type *clss, ir_type *subtype) {
        int i;
        assert(clss && (clss->type_op == type_class));
        for (i = 0; i < (ARR_LEN (clss->attr.ca.subtypes)); i++)
                if (clss->attr.ca.subtypes[i] == subtype) {
                        for (; i < (ARR_LEN (clss->attr.ca.subtypes))-1; i++)
                                clss->attr.ca.subtypes[i] = clss->attr.ca.subtypes[i+1];
                        ARR_SETLEN(ir_entity*, clss->attr.ca.subtypes, ARR_LEN(clss->attr.ca.subtypes) - 1);
                        break;
                }
}

void add_class_supertype(ir_type *clss, ir_type *supertype) {
        int i;
        assert(clss && (clss->type_op == type_class));
        assert(supertype && (supertype -> type_op == type_class));
        ARR_APP1 (ir_type *, clss->attr.ca.supertypes, supertype);
        for (i = get_class_n_subtypes(supertype) - 1; i >= 0; --i)
                if (get_class_subtype(supertype, i) == clss)
                        /* Class already registered */
                        return;
        ARR_APP1(ir_type *, supertype->attr.ca.subtypes, clss);
}

int get_class_n_supertypes(const ir_type *clss) {
        assert(clss && (clss->type_op == type_class));
        return ARR_LEN(clss->attr.ca.supertypes);
}

int get_class_supertype_index(ir_type *clss, ir_type *super_clss) {
        int i, n_supertypes = get_class_n_supertypes(clss);
        assert(super_clss && (super_clss->type_op == type_class));
        for (i = 0; i < n_supertypes; i++)
                if (get_class_supertype(clss, i) == super_clss)
                        return i;
                return -1;
}

ir_type *get_class_supertype(ir_type *clss, int pos) {
        assert(clss && (clss->type_op == type_class));
        assert(pos >= 0 && pos < get_class_n_supertypes(clss));
        return clss->attr.ca.supertypes[pos] = skip_tid(clss->attr.ca.supertypes[pos]);
}

void set_class_supertype(ir_type *clss, ir_type *supertype, int pos) {
        assert(clss && (clss->type_op == type_class));
        assert(pos >= 0 && pos < get_class_n_supertypes(clss));
        clss->attr.ca.supertypes[pos] = supertype;
}

void remove_class_supertype(ir_type *clss, ir_type *supertype) {
        int i;
        assert(clss && (clss->type_op == type_class));
        for (i = 0; i < (ARR_LEN(clss->attr.ca.supertypes)); i++)
                if (clss->attr.ca.supertypes[i] == supertype) {
                        for(; i < (ARR_LEN(clss->attr.ca.supertypes))-1; i++)
                                clss->attr.ca.supertypes[i] = clss->attr.ca.supertypes[i+1];
                        ARR_SETLEN(ir_entity*, clss->attr.ca.supertypes, ARR_LEN(clss->attr.ca.supertypes) - 1);
                        break;
                }
}

ir_entity *get_class_type_info(const ir_type *clss) {
        return clss->attr.ca.type_info;
}

void set_class_type_info(ir_type *clss, ir_entity *ent) {
        clss->attr.ca.type_info = ent;
        if (ent)
                ent->repr_class = clss;
}

const char *get_peculiarity_name(ir_peculiarity p) {
#define X(a)    case a: return #a
        switch (p) {
        X(peculiarity_description);
        X(peculiarity_inherited);
        X(peculiarity_existent);
        }
#undef X
        return "invalid peculiarity";
}

ir_peculiarity get_class_peculiarity(const ir_type *clss) {
        assert(clss && (clss->type_op == type_class));
        return clss->attr.ca.peculiarity;
}

void set_class_peculiarity(ir_type *clss, ir_peculiarity pec) {
        assert(clss && (clss->type_op == type_class));
        assert(pec != peculiarity_inherited);  /* There is no inheritance of types in libFirm. */
        clss->attr.ca.peculiarity = pec;
}

/* Returns the size of the virtual function table. */
unsigned (get_class_vtable_size)(const ir_type *clss) {
        return _get_class_vtable_size(clss);
}

/* Sets a new size of the virtual function table. */
void (set_class_vtable_size)(ir_type *clss, unsigned size) {
        _set_class_vtable_size(clss, size);
}

/* Returns non-zero if a class is final. */
int (is_class_final)(const ir_type *clss) {
        return _is_class_final(clss);
}

/* Sets if a class is final. */
void (set_class_final)(ir_type *clss, int flag) {
        _set_class_final(clss, flag);
}

/* Returns non-zero if a class is an interface. */
int (is_class_interface)(const ir_type *clss) {
        return _is_class_interface(clss);
}

/* Sets the class interface flag. */
void (set_class_interface)(ir_type *clss, int flag) {
        _set_class_interface(clss, flag);
}

/* Returns non-zero if a class is abstract. */
int (is_class_abstract)(const ir_type *clss) {
         return _is_class_abstract(clss);
}

/* Sets the class abstract flag. */
void (set_class_abstract)(ir_type *clss, int final) {
        _set_class_abstract(clss, final);
}

void set_class_dfn(ir_type *clss, int dfn) {
        clss->attr.ca.dfn = dfn;
}

int get_class_dfn(const ir_type *clss) {
        return (clss->attr.ca.dfn);
}

/* typecheck */
int (is_Class_type)(const ir_type *clss) {
        return _is_class_type(clss);
}

void set_class_mode(ir_type *tp, ir_mode *mode) {
        /* for classes and structs we allow to set a mode if the layout is fixed AND the size matches */
        assert(get_type_state(tp) == layout_fixed &&
               tp->size == get_mode_size_bytes(mode) && "mode don't match class layout");
        tp->mode = mode;
}

void set_class_size(ir_type *tp, unsigned size) {
        tp->size = size;
}

/*----------------------------------------------------------------**/
/* TYPE_STRUCT                                                     */
/*----------------------------------------------------------------**/

/* create a new type struct */
ir_type *new_d_type_struct(ident *name, dbg_info *db) {
        ir_type *res = new_type(type_struct, NULL, name, db);

        res->attr.sa.members = NEW_ARR_F(ir_entity *, 0);
        hook_new_type(res);
        return res;
}

ir_type *new_type_struct(ident *name) {
        return new_d_type_struct (name, NULL);
}

void free_struct_entities(ir_type *strct) {
        int i;
        assert(strct && (strct->type_op == type_struct));
        for (i = get_struct_n_members(strct)-1; i >= 0; --i)
                free_entity(get_struct_member(strct, i));
}

void free_struct_attrs(ir_type *strct) {
        assert(strct && (strct->type_op == type_struct));
        DEL_ARR_F(strct->attr.sa.members);
}

/* manipulate private fields of struct */
int get_struct_n_members(const ir_type *strct) {
        assert(strct && (strct->type_op == type_struct));
        return ARR_LEN(strct->attr.sa.members);
}

void add_struct_member(ir_type *strct, ir_entity *member) {
        assert(strct && (strct->type_op == type_struct));
        assert(get_type_tpop(get_entity_type(member)) != type_method);
        assert(strct != get_entity_type(member) && "recursive type");
        assert(get_type_state(strct) != layout_fixed);
        ARR_APP1 (ir_entity *, strct->attr.sa.members, member);
}

ir_entity *get_struct_member(const ir_type *strct, int pos) {
        assert(strct && (strct->type_op == type_struct));
        assert(pos >= 0 && pos < get_struct_n_members(strct));
        return strct->attr.sa.members[pos];
}

int get_struct_member_index(const ir_type *strct, ir_entity *mem) {
        int i, n;
        assert(strct && (strct->type_op == type_struct));
        for (i = 0, n = get_struct_n_members(strct); i < n; ++i)
                if (get_struct_member(strct, i) == mem)
                        return i;
                return -1;
}

void set_struct_member(ir_type *strct, int pos, ir_entity *member) {
        assert(strct && (strct->type_op == type_struct));
        assert(pos >= 0 && pos < get_struct_n_members(strct));
        assert(get_entity_type(member)->type_op != type_method);/* @@@ lowerfirm !!*/
        strct->attr.sa.members[pos] = member;
}

void remove_struct_member(ir_type *strct, ir_entity *member) {
        int i;
        assert(strct && (strct->type_op == type_struct));
        for (i = 0; i < (ARR_LEN (strct->attr.sa.members)); i++)
                if (strct->attr.sa.members[i] == member) {
                        for(; i < (ARR_LEN (strct->attr.sa.members))-1; i++)
                                strct->attr.sa.members[i] = strct->attr.sa.members[i+1];
                        ARR_SETLEN(ir_entity*, strct->attr.sa.members, ARR_LEN(strct->attr.sa.members) - 1);
                        break;
                }
}

/* typecheck */
int (is_Struct_type)(const ir_type *strct) {
        return _is_struct_type(strct);
}

void set_struct_mode(ir_type *tp, ir_mode *mode) {
        /* for classes and structs we allow to set a mode if the layout is fixed AND the size matches */
        assert(get_type_state(tp) == layout_fixed &&
               tp->size == get_mode_size_bytes(mode) && "mode don't match struct layout");
        tp->mode = mode;
}

void set_struct_size(ir_type *tp, unsigned size) {
        tp->size = size;
}

/*******************************************************************/
/** TYPE_METHOD                                                   **/
/*******************************************************************/

/**
 * Lazy construction of value argument / result representation.
 * Constructs a struct type and its member.  The types of the members
 * are passed in the argument list.
 *
 * @param name    name of the type constructed
 * @param len     number of fields
 * @param tps     array of field types with length len
 */
static ir_type *
build_value_type(ident *name, int len, tp_ent_pair *tps) {
        int i;
        ir_type *res = new_type_struct(name);
        res->flags |= tf_value_param_type;
        /* Remove type from type list.  Must be treated differently than other types. */
        remove_irp_type(res);
        for (i = 0; i < len; i++) {
                ident *id = tps[i].param_name;

                /* use res as default if corresponding type is not yet set. */
                ir_type *elt_type = tps[i].tp ? tps[i].tp : res;

                /* use the parameter name if specified */
                if (! id)
                        id = mangle_u(name, get_type_ident(elt_type));
                tps[i].ent = new_entity(res, id, elt_type);
                set_entity_allocation(tps[i].ent, allocation_parameter);
        }
        return res;
}

/* Create a new method type.
   N_param is the number of parameters, n_res the number of results.  */
ir_type *new_d_type_method(ident *name, int n_param, int n_res, dbg_info *db) {
        ir_type *res;

        assert((get_mode_size_bits(mode_P_code) % 8 == 0) && "unorthodox modes not implemented");
        res = new_type(type_method, mode_P_code, name, db);
        res->flags                       |= tf_layout_fixed;
        res->size                         = get_mode_size_bytes(mode_P_code);
        res->attr.ma.n_params             = n_param;
        res->attr.ma.params               = XMALLOCNZ(tp_ent_pair, n_param);
        res->attr.ma.value_params         = NULL;
        res->attr.ma.n_res                = n_res;
        res->attr.ma.res_type             = XMALLOCNZ(tp_ent_pair, n_res);
        res->attr.ma.value_ress           = NULL;
        res->attr.ma.variadicity          = variadicity_non_variadic;
        res->attr.ma.first_variadic_param = -1;
        res->attr.ma.additional_properties = mtp_no_property;
        res->attr.ma.irg_calling_conv     = default_cc_mask;
        hook_new_type(res);
        return res;
}

ir_type *new_type_method(ident *name, int n_param, int n_res) {
        return new_d_type_method(name, n_param, n_res, NULL);
}

/* clone an existing method type */
ir_type *clone_type_method(ir_type *tp, ident *prefix) {
        ir_type  *res;
        ident    *name;
        ir_mode  *mode;
        int      n_params, n_res;
        dbg_info *db;

        assert(is_Method_type(tp));

        name = tp->name;
        if (prefix != NULL)
                name = mangle(prefix, name);

        mode     = tp->mode;
        n_params = tp->attr.ma.n_params;
        n_res    = tp->attr.ma.n_res;
        db       = tp->dbi;

        res = new_type(type_method, mode, name, db);

        res->flags                         = tp->flags;
        res->assoc_type                    = tp->assoc_type;
        res->size                          = tp->size;
        res->attr.ma.n_params              = n_params;
        res->attr.ma.params                = XMALLOCN(tp_ent_pair, n_params);
        memcpy(res->attr.ma.params, tp->attr.ma.params, n_params * sizeof(res->attr.ma.params[0]));
        res->attr.ma.value_params          = tp->attr.ma.value_params;
        res->attr.ma.n_res                 = n_res;
        res->attr.ma.res_type              = XMALLOCN(tp_ent_pair, n_res);
        memcpy(res->attr.ma.res_type, tp->attr.ma.res_type, n_res * sizeof(res->attr.ma.res_type[0]));
        res->attr.ma.value_ress            = tp->attr.ma.value_ress;
        res->attr.ma.variadicity           = tp->attr.ma.variadicity;
        res->attr.ma.first_variadic_param  = tp->attr.ma.first_variadic_param;
        res->attr.ma.additional_properties = tp->attr.ma.additional_properties;
        res->attr.ma.irg_calling_conv      = tp->attr.ma.irg_calling_conv;
        hook_new_type(res);
        return res;
}

void free_method_entities(ir_type *method) {
  (void) method;
        assert(method && (method->type_op == type_method));
}

/* Attention: also frees entities in value parameter subtypes! */
void free_method_attrs(ir_type *method) {
        assert(method && (method->type_op == type_method));
        free(method->attr.ma.params);
        free(method->attr.ma.res_type);
        /* cannot free it yet, type could be cloned ...
        if (method->attr.ma.value_params) {
                free_type_entities(method->attr.ma.value_params);
                free_type(method->attr.ma.value_params);
        }
        */
        if (method->attr.ma.value_ress) {
                free_type_entities(method->attr.ma.value_ress);
                free_type(method->attr.ma.value_ress);
        }
}

/* manipulate private fields of method. */
int (get_method_n_params)(const ir_type *method) {
        return _get_method_n_params(method);
}

/* Returns the type of the parameter at position pos of a method. */
ir_type *get_method_param_type(ir_type *method, int pos) {
        ir_type *res;
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_params(method));
        res = method->attr.ma.params[pos].tp;
        assert(res != NULL && "empty method param type");
        return method->attr.ma.params[pos].tp = skip_tid(res);
}

void  set_method_param_type(ir_type *method, int pos, ir_type *tp) {
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_params(method));
        method->attr.ma.params[pos].tp = tp;
        /* If information constructed set pass-by-value representation. */
        if (method->attr.ma.value_params) {
                assert(get_method_n_params(method) == get_struct_n_members(method->attr.ma.value_params));
                set_entity_type(get_struct_member(method->attr.ma.value_params, pos), tp);
        }
}

/* Returns an ident representing the parameters name. Returns NULL if not set.
   For debug support only. */
ident *get_method_param_ident(ir_type *method, int pos) {
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_params(method));
        return method->attr.ma.params[pos].param_name;
}

/* Returns a string representing the parameters name. Returns NULL if not set.
   For debug support only. */
const char *get_method_param_name(ir_type *method, int pos) {
        ident *id = get_method_param_ident(method, pos);
        return id ? get_id_str(id) : NULL;
}

/* Sets an ident representing the parameters name. For debug support only. */
void set_method_param_ident(ir_type *method, int pos, ident *id) {
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_params(method));
        method->attr.ma.params[pos].param_name = id;
}

/* Returns an entity that represents the copied value argument.  Only necessary
   for compounds passed by value. */
ir_entity *get_method_value_param_ent(ir_type *method, int pos) {
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_params(method));

        if (!method->attr.ma.value_params) {
                /* parameter value type not created yet, build */
                method->attr.ma.value_params
                        = build_value_type(mangle_u(get_type_ident(method), value_params_suffix),
                        get_method_n_params(method), method->attr.ma.params);
        }
        /*
         * build_value_type() sets the method->attr.ma.value_params type as default if
         * no type is set!
         */
        assert((get_entity_type(method->attr.ma.params[pos].ent) != method->attr.ma.value_params)
               && "param type not yet set");
        return method->attr.ma.params[pos].ent;
}

/*
 * Returns a type that represents the copied value arguments.
 */
ir_type *get_method_value_param_type(const ir_type *method) {
        assert(method && (method->type_op == type_method));
        return method->attr.ma.value_params;
}

int (get_method_n_ress)(const ir_type *method) {
        return _get_method_n_ress(method);
}

ir_type *get_method_res_type(ir_type *method, int pos) {
        ir_type *res;
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_ress(method));
        res = method->attr.ma.res_type[pos].tp;
        assert(res != NULL && "empty method return type");
        return method->attr.ma.res_type[pos].tp = skip_tid(res);
}

void  set_method_res_type(ir_type *method, int pos, ir_type *tp) {
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_ress(method));
        /* set the result ir_type */
        method->attr.ma.res_type[pos].tp = tp;
        /* If information constructed set pass-by-value representation. */
        if (method->attr.ma.value_ress) {
                assert(get_method_n_ress(method) == get_struct_n_members(method->attr.ma.value_ress));
                set_entity_type(get_struct_member(method->attr.ma.value_ress, pos), tp);
        }
}

/* Returns an entity that represents the copied value result.  Only necessary
   for compounds passed by value. */
ir_entity *get_method_value_res_ent(ir_type *method, int pos) {
        assert(method && (method->type_op == type_method));
        assert(pos >= 0 && pos < get_method_n_ress(method));

        if (!method->attr.ma.value_ress) {
                /* result value type not created yet, build */
                method->attr.ma.value_ress
                        = build_value_type(mangle_u(get_type_ident(method), value_ress_suffix),
                        get_method_n_ress(method), method->attr.ma.res_type);
        }
        /*
         * build_value_type() sets the method->attr.ma.value_ress type as default if
         * no type is set!
         */
        assert((get_entity_type(method->attr.ma.res_type[pos].ent) != method->attr.ma.value_ress)
               && "result type not yet set");

        return method->attr.ma.res_type[pos].ent;
}

/*
 * Returns a type that represents the copied value results.
 */
ir_type *get_method_value_res_type(const ir_type *method) {
        assert(method && (method->type_op == type_method));
        return method->attr.ma.value_ress;
}

/* Returns the null-terminated name of this variadicity. */
const char *get_variadicity_name(variadicity vari) {
#define X(a)    case a: return #a
        switch (vari) {
        X(variadicity_non_variadic);
        X(variadicity_variadic);
        default:
                return "BAD VALUE";
        }
#undef X
}

variadicity get_method_variadicity(const ir_type *method) {
        assert(method && (method->type_op == type_method));
        return method->attr.ma.variadicity;
}

void set_method_variadicity(ir_type *method, variadicity vari) {
        assert(method && (method->type_op == type_method));
        method->attr.ma.variadicity = vari;
}

/*
 * Returns the first variadic parameter index of a type.
 * If this index was NOT set, the index of the last parameter
 * of the method type plus one is returned for variadic functions.
 * Non-variadic function types always return -1 here.
 */
int get_method_first_variadic_param_index(const ir_type *method) {
        assert(method && (method->type_op == type_method));

        if (method->attr.ma.variadicity == variadicity_non_variadic)
                return -1;

        if (method->attr.ma.first_variadic_param == -1)
                return get_method_n_params(method);
        return method->attr.ma.first_variadic_param;
}

/*
 * Sets the first variadic parameter index. This allows to specify
 * a complete call type (containing the type of all parameters)
 * but still have the knowledge, which parameter must be passed as
 * variadic one.
 */
void set_method_first_variadic_param_index(ir_type *method, int index) {
        assert(method && (method->type_op == type_method));
        assert(index >= 0 && index <= get_method_n_params(method));

        method->attr.ma.first_variadic_param = index;
}

unsigned (get_method_additional_properties)(const ir_type *method) {
        return _get_method_additional_properties(method);
}

void (set_method_additional_properties)(ir_type *method, unsigned mask) {
        _set_method_additional_properties(method, mask);
}

void (set_method_additional_property)(ir_type *method, mtp_additional_property flag) {
        _set_method_additional_property(method, flag);
}

/* Returns the calling convention of an entities graph. */
unsigned (get_method_calling_convention)(const ir_type *method) {
        return _get_method_calling_convention(method);
}

/* Sets the calling convention of an entities graph. */
void (set_method_calling_convention)(ir_type *method, unsigned cc_mask) {
        _set_method_calling_convention(method, cc_mask);
}

/* Returns the number of registers parameters, 0 means default. */
unsigned get_method_n_regparams(ir_type *method) {
        unsigned cc = get_method_calling_convention(method);
        assert(IS_FASTCALL(cc));

        return cc & ~cc_bits;
}

/* Sets the number of registers parameters, 0 means default. */
void set_method_n_regparams(ir_type *method, unsigned n_regs) {
        unsigned cc = get_method_calling_convention(method);
        assert(IS_FASTCALL(cc));

        set_method_calling_convention(method, (cc & cc_bits) | (n_regs & ~cc_bits));
}

/* typecheck */
int (is_Method_type)(const ir_type *method) {
        return _is_method_type(method);
}

/*-----------------------------------------------------------------*/
/* TYPE_UNION                                                      */
/*-----------------------------------------------------------------*/

/* create a new type uni */
ir_type *new_d_type_union(ident *name, dbg_info *db) {
        ir_type *res = new_type(type_union, NULL, name, db);

        res->attr.ua.members = NEW_ARR_F(ir_entity *, 0);
        hook_new_type(res);
        return res;
}

ir_type *new_type_union(ident *name) {
        return new_d_type_union(name, NULL);
}

void free_union_entities(ir_type *uni) {
        int i;
        assert(uni && (uni->type_op == type_union));
        for (i = get_union_n_members(uni) - 1; i >= 0; --i)
                free_entity(get_union_member(uni, i));
}

void free_union_attrs (ir_type *uni) {
        assert(uni && (uni->type_op == type_union));
        DEL_ARR_F(uni->attr.ua.members);
}

/* manipulate private fields of union */
int get_union_n_members(const ir_type *uni) {
        assert(uni && (uni->type_op == type_union));
        return ARR_LEN(uni->attr.ua.members);
}

void add_union_member(ir_type *uni, ir_entity *member) {
        assert(uni && (uni->type_op == type_union));
        assert(uni != get_entity_type(member) && "recursive type");
        assert(get_type_state(uni) != layout_fixed);
        ARR_APP1(ir_entity *, uni->attr.ua.members, member);
}

ir_entity *get_union_member(const ir_type *uni, int pos) {
        assert(uni && (uni->type_op == type_union));
        assert(pos >= 0 && pos < get_union_n_members(uni));
        return uni->attr.ua.members[pos];
}

int get_union_member_index(const ir_type *uni, ir_entity *mem) {
        int i, n;
        assert(uni && (uni->type_op == type_union));
        for (i = 0, n = get_union_n_members(uni); i < n; ++i)
                if (get_union_member(uni, i) == mem)
                        return i;
                return -1;
}

void set_union_member(ir_type *uni, int pos, ir_entity *member) {
        assert(uni && (uni->type_op == type_union));
        assert(pos >= 0 && pos < get_union_n_members(uni));
        uni->attr.ua.members[pos] = member;
}

void remove_union_member(ir_type *uni, ir_entity *member) {
        int i;
        assert(uni && (uni->type_op == type_union));
        for (i = 0; i < (ARR_LEN(uni->attr.ua.members)); i++)
                if (uni->attr.ua.members[i] == member) {
                        for(; i < (ARR_LEN(uni->attr.ua.members))-1; i++)
                                uni->attr.ua.members[i] = uni->attr.ua.members[i+1];
                        ARR_SETLEN(ir_entity*, uni->attr.ua.members, ARR_LEN(uni->attr.ua.members) - 1);
                        break;
                }
}

/* typecheck */
int (is_Union_type)(const ir_type *uni) {
        return _is_union_type(uni);
}

void set_union_size(ir_type *tp, unsigned size) {
        tp->size = size;
}

/*-----------------------------------------------------------------*/
/* TYPE_ARRAY                                                      */
/*-----------------------------------------------------------------*/


/* create a new type array -- set dimension sizes independently */
ir_type *new_d_type_array(ident *name, int n_dimensions, ir_type *element_type, dbg_info *db) {
        ir_type *res;
        int i;
        ir_node *unk;
        ir_graph *rem = current_ir_graph;

        assert(!is_Method_type(element_type));

        res = new_type(type_array, NULL, name, db);
        res->attr.aa.n_dimensions = n_dimensions;
        res->attr.aa.lower_bound  = XMALLOCNZ(ir_node*, n_dimensions);
        res->attr.aa.upper_bound  = XMALLOCNZ(ir_node*, n_dimensions);
        res->attr.aa.order        = XMALLOCNZ(int,      n_dimensions);

        current_ir_graph = get_const_code_irg();
        unk = new_Unknown(mode_Iu);
        for (i = 0; i < n_dimensions; i++) {
                res->attr.aa.lower_bound[i] =
                res->attr.aa.upper_bound[i] = unk;
                res->attr.aa.order[i]       = i;
        }
        current_ir_graph = rem;

        res->attr.aa.element_type = element_type;
        new_entity(res, mangle_u(name, new_id_from_chars("elem_ent", 8)), element_type);
        hook_new_type(res);
        return res;
}

ir_type *new_type_array(ident *name, int n_dimensions, ir_type *element_type) {
        return new_d_type_array(name, n_dimensions, element_type, NULL);
}

void free_array_automatic_entities(ir_type *array) {
        assert(array && (array->type_op == type_array));
        free_entity(get_array_element_entity(array));
}

void free_array_entities (ir_type *array) {
        (void) array;
        assert(array && (array->type_op == type_array));
}

void free_array_attrs (ir_type *array) {
        assert(array && (array->type_op == type_array));
        free(array->attr.aa.lower_bound);
        free(array->attr.aa.upper_bound);
        free(array->attr.aa.order);
}

/* manipulate private fields of array ir_type */
int get_array_n_dimensions (const ir_type *array) {
        assert(array && (array->type_op == type_array));
        return array->attr.aa.n_dimensions;
}

void
set_array_bounds(ir_type *array, int dimension, ir_node * lower_bound, ir_node * upper_bound) {
        assert(array && (array->type_op == type_array));
        assert(lower_bound && "lower_bound node may not be NULL.");
        assert(upper_bound && "upper_bound node may not be NULL.");
        assert(dimension < array->attr.aa.n_dimensions && dimension >= 0);
        array->attr.aa.lower_bound[dimension] = lower_bound;
        array->attr.aa.upper_bound[dimension] = upper_bound;
}

void
set_array_bounds_int(ir_type *array, int dimension, int lower_bound, int upper_bound) {
        ir_graph *rem = current_ir_graph;
        current_ir_graph = get_const_code_irg();
        set_array_bounds(array, dimension,
                  new_Const(mode_Iu, new_tarval_from_long (lower_bound, mode_Iu)),
                  new_Const(mode_Iu, new_tarval_from_long (upper_bound, mode_Iu )));
        current_ir_graph = rem;
}

void
set_array_lower_bound(ir_type *array, int dimension, ir_node *lower_bound) {
        assert(array && (array->type_op == type_array));
        assert(lower_bound && "lower_bound node may not be NULL.");
        array->attr.aa.lower_bound[dimension] = lower_bound;
}

void set_array_lower_bound_int(ir_type *array, int dimension, int lower_bound) {
        ir_graph *rem = current_ir_graph;
        current_ir_graph = get_const_code_irg();
        set_array_lower_bound(array, dimension,
             new_Const(mode_Iu, new_tarval_from_long (lower_bound, mode_Iu)));
        current_ir_graph = rem;
}
void
set_array_upper_bound  (ir_type *array, int dimension, ir_node * upper_bound) {
  assert(array && (array->type_op == type_array));
  assert(upper_bound && "upper_bound node may not be NULL.");
  array->attr.aa.upper_bound[dimension] = upper_bound;
}
void set_array_upper_bound_int(ir_type *array, int dimension, int upper_bound) {
        ir_graph *rem = current_ir_graph;
        current_ir_graph = get_const_code_irg();
        set_array_upper_bound(array, dimension,
                    new_Const(mode_Iu, new_tarval_from_long (upper_bound, mode_Iu)));
        current_ir_graph = rem;
}

int has_array_lower_bound(const ir_type *array, int dimension) {
        assert(array && (array->type_op == type_array));
        return !is_Unknown(array->attr.aa.lower_bound[dimension]);
}

ir_node *get_array_lower_bound(const ir_type *array, int dimension) {
        assert(array && (array->type_op == type_array));
        return array->attr.aa.lower_bound[dimension];
}

long get_array_lower_bound_int(const ir_type *array, int dimension) {
        ir_node *node;
        assert(array && (array->type_op == type_array));
        node = array->attr.aa.lower_bound[dimension];
        assert(is_Const(node));
        return get_tarval_long(get_Const_tarval(node));
}

int has_array_upper_bound(const ir_type *array, int dimension) {
        assert(array && (array->type_op == type_array));
        return !is_Unknown(array->attr.aa.upper_bound[dimension]);
}

ir_node *get_array_upper_bound(const ir_type *array, int dimension) {
        assert(array && (array->type_op == type_array));
        return array->attr.aa.upper_bound[dimension];
}

long get_array_upper_bound_int(const ir_type *array, int dimension) {
        ir_node *node;
        assert(array && (array->type_op == type_array));
        node = array->attr.aa.upper_bound[dimension];
        assert(is_Const(node));
        return get_tarval_long(get_Const_tarval(node));
}

void set_array_order(ir_type *array, int dimension, int order) {
        assert(array && (array->type_op == type_array));
        array->attr.aa.order[dimension] = order;
}

int get_array_order(const ir_type *array, int dimension) {
        assert(array && (array->type_op == type_array));
        return array->attr.aa.order[dimension];
}

int find_array_dimension(const ir_type *array, int order) {
        int dim;

        assert(array && (array->type_op == type_array));

        for (dim = 0; dim < array->attr.aa.n_dimensions; ++dim) {
                if (array->attr.aa.order[dim] == order)
                        return dim;
        }
        return -1;
}

void set_array_element_type(ir_type *array, ir_type *tp) {
        assert(array && (array->type_op == type_array));
        assert(!is_Method_type(tp));
        array->attr.aa.element_type = tp;
}

ir_type *get_array_element_type(ir_type *array) {
        assert(array && (array->type_op == type_array));
        return array->attr.aa.element_type = skip_tid(array->attr.aa.element_type);
}

void set_array_element_entity(ir_type *array, ir_entity *ent) {
        assert(array && (array->type_op == type_array));
        assert((get_entity_type(ent)->type_op != type_method));
        array->attr.aa.element_ent = ent;
        array->attr.aa.element_type = get_entity_type(ent);
}

ir_entity *get_array_element_entity(const ir_type *array) {
        assert(array && (array->type_op == type_array));
        return array->attr.aa.element_ent;
}

/* typecheck */
int (is_Array_type)(const ir_type *array) {
        return _is_array_type(array);
}

void set_array_size(ir_type *tp, unsigned size) {
        /* FIXME: Here we should make some checks with the element type size */
        tp->size = size;
}
/*-----------------------------------------------------------------*/
/* TYPE_ENUMERATION                                                */
/*-----------------------------------------------------------------*/

/* create a new type enumeration -- set the enumerators independently */
ir_type *new_d_type_enumeration(ident *name, int n_enums, dbg_info *db) {
        ir_type *res;

        assert(n_enums >= 0);
        res = new_type(type_enumeration, NULL, name, db);
        res->attr.ea.enumer = NEW_ARR_F(ir_enum_const, n_enums);
        hook_new_type(res);
        return res;
}

ir_type *new_type_enumeration(ident *name, int n_enums) {
        return new_d_type_enumeration(name, n_enums, NULL);
}

void free_enumeration_entities(ir_type *enumeration) {
        (void) enumeration;
        assert(enumeration && (enumeration->type_op == type_enumeration));
}
void free_enumeration_attrs(ir_type *enumeration) {
        assert(enumeration && (enumeration->type_op == type_enumeration));
        DEL_ARR_F(enumeration->attr.ea.enumer);
}

/* manipulate fields of enumeration type. */
int get_enumeration_n_enums(const ir_type *enumeration) {
        assert(enumeration && (enumeration->type_op == type_enumeration));
        return ARR_LEN(enumeration->attr.ea.enumer);
}

/* create a new constant */
void set_enumeration_const(ir_type *enumeration, int pos, ident *nameid, tarval *con) {
        assert(0 <= pos && pos < ARR_LEN(enumeration->attr.ea.enumer));
        enumeration->attr.ea.enumer[pos].nameid = nameid;
        enumeration->attr.ea.enumer[pos].value  = con;
        enumeration->attr.ea.enumer[pos].owner  = enumeration;
}

ir_enum_const *get_enumeration_const(const ir_type *enumeration, int pos) {
        assert(enumeration && (enumeration->type_op == type_enumeration));
        assert(pos >= 0 && pos < get_enumeration_n_enums(enumeration));
        return &enumeration->attr.ea.enumer[pos];
}

ir_type *get_enumeration_owner(const ir_enum_const *enum_cnst) {
        return enum_cnst->owner;
}

void set_enumeration_value(ir_enum_const *enum_cnst, tarval *con) {
        enum_cnst->value = con;
}

tarval *get_enumeration_value(const ir_enum_const *enum_cnst) {
        return enum_cnst->value;
}

void set_enumeration_nameid(ir_enum_const *enum_cnst, ident *id) {
        enum_cnst->nameid = id;
}

ident *get_enumeration_nameid(const ir_enum_const *enum_cnst) {
        return enum_cnst->nameid;
}

const char *get_enumeration_name(const ir_enum_const *enum_cnst) {
        return get_id_str(enum_cnst->nameid);
}

/* typecheck */
int (is_Enumeration_type)(const ir_type *enumeration) {
        return _is_enumeration_type(enumeration);
}

void set_enumeration_mode(ir_type *tp, ir_mode *mode) {
        assert(mode_is_int(mode) && "Modes of enumerations must be integers");
        /* For pointer and enumeration size depends on the mode, but only byte size allowed. */
        assert((get_mode_size_bits(mode) % 8) == 0 && "unorthodox modes not implemented");

        tp->size = get_mode_size_bytes(mode);
        tp->mode = mode;
}

/*-----------------------------------------------------------------*/
/* TYPE_POINTER                                                    */
/*-----------------------------------------------------------------*/

/* Create a new type pointer */
ir_type *new_d_type_pointer(ident *name, ir_type *points_to, ir_mode *ptr_mode, dbg_info *db) {
        ir_type *res;

        assert(mode_is_reference(ptr_mode));
        res = new_type(type_pointer, ptr_mode, name, db);
        res->attr.pa.points_to = points_to;
        assert((get_mode_size_bits(res->mode) % 8 == 0) && "unorthodox modes not implemented");
        res->size = get_mode_size_bytes(res->mode);
        res->flags |= tf_layout_fixed;
        hook_new_type(res);
        return res;
}

ir_type *new_type_pointer(ident *name, ir_type *points_to, ir_mode *ptr_mode) {
        return new_d_type_pointer(name, points_to, ptr_mode, NULL);
}

void free_pointer_entities(ir_type *pointer) {
        (void) pointer;
        assert(pointer && (pointer->type_op == type_pointer));
}

void free_pointer_attrs(ir_type *pointer) {
        (void) pointer;
        assert(pointer && (pointer->type_op == type_pointer));
}

/* manipulate fields of type_pointer */
void set_pointer_points_to_type(ir_type *pointer, ir_type *tp) {
        assert(pointer && (pointer->type_op == type_pointer));
        pointer->attr.pa.points_to = tp;
}

ir_type *get_pointer_points_to_type(ir_type *pointer) {
        assert(pointer && (pointer->type_op == type_pointer));
        return pointer->attr.pa.points_to = skip_tid(pointer->attr.pa.points_to);
}

/* typecheck */
int (is_Pointer_type)(const ir_type *pointer) {
        return _is_pointer_type(pointer);
}

void set_pointer_mode(ir_type *tp, ir_mode *mode) {
        assert(mode_is_reference(mode) && "Modes of pointers must be references");
        /* For pointer and enumeration size depends on the mode, but only byte size allowed. */
        assert((get_mode_size_bits(mode) & 7) == 0 && "unorthodox modes not implemented");

        tp->size = get_mode_size_bytes(mode);
        tp->mode = mode;
}

/* Returns the first pointer type that has as points_to tp.
 *  Not efficient: O(#types).
 *  If not found returns firm_unknown_type. */
ir_type *find_pointer_type_to_type (ir_type *tp) {
        int i, n = get_irp_n_types();
        for (i = 0; i < n; ++i) {
                ir_type *found = get_irp_type(i);
                if (is_Pointer_type(found) && get_pointer_points_to_type(found) == tp)
                        return (found);
        }
        return firm_unknown_type;
}


/*-----------------------------------------------------------------*/
/* TYPE_PRIMITIVE                                                  */
/*-----------------------------------------------------------------*/

/* create a new type primitive */
ir_type *new_d_type_primitive(ident *name, ir_mode *mode, dbg_info *db) {
        ir_type *res = new_type(type_primitive, mode, name, db);
        res->size  = get_mode_size_bytes(mode);
        res->flags |= tf_layout_fixed;
        res->attr.ba.base_type = NULL;
        hook_new_type(res);
        return res;
}

ir_type *new_type_primitive(ident *name, ir_mode *mode) {
        return new_d_type_primitive(name, mode, NULL);
}

/* type check */
int (is_Primitive_type)(const ir_type *primitive) {
        return _is_primitive_type(primitive);
}

void set_primitive_mode(ir_type *tp, ir_mode *mode) {
        /* Modes of primitives must be data */
        assert(mode_is_data(mode));

        /* For primitive size depends on the mode. */
        tp->size = get_mode_size_bytes(mode);
        tp->mode = mode;
}

/* Return the base type of a primitive (bitfield) type or NULL if none. */
ir_type *get_primitive_base_type(ir_type *tp) {
        assert(is_Primitive_type(tp));
        return tp->attr.ba.base_type;
}

/* Sets the base type of a primitive (bitfield) type. */
void set_primitive_base_type(ir_type *tp, ir_type *base_tp) {
        assert(is_Primitive_type(tp));
        tp->attr.ba.base_type = base_tp;
}

/*-----------------------------------------------------------------*/
/* common functionality                                            */
/*-----------------------------------------------------------------*/


int (is_atomic_type)(const ir_type *tp) {
        return _is_atomic_type(tp);
}

/*
 * Gets the number of elements in a firm compound type.
 */
int get_compound_n_members(const ir_type *tp) {
        const tp_op *op = get_type_tpop(tp);
        int res = 0;

        if (op->ops.get_n_members)
                res = op->ops.get_n_members(tp);
        else
                assert(0 && "no member count for this type");

        return res;
}

/*
 * Gets the member of a firm compound type at position pos.
 */
ir_entity *get_compound_member(const ir_type *tp, int pos) {
        const tp_op *op = get_type_tpop(tp);
        ir_entity *res = NULL;

        if (op->ops.get_member)
                res = op->ops.get_member(tp, pos);
        else
                assert(0 && "no members in this type");

        return res;
}

/* Returns index of member in tp, -1 if not contained. */
int get_compound_member_index(const ir_type *tp, ir_entity *member) {
        const tp_op *op = get_type_tpop(tp);
        int index = -1;

        if (op->ops.get_member_index)
                index = op->ops.get_member_index(tp, member);
        else
                assert(0 && "no members in this type");

        return index;
}

int is_compound_type(const ir_type *tp) {
        assert(tp && tp->kind == k_type);
        return tp->type_op->flags & TP_OP_FLAG_COMPOUND;
}

/* Checks, whether a type is a frame type */
int is_frame_type(const ir_type *tp) {
        return tp->flags & tf_frame_type;
}

/* Checks, whether a type is a value parameter type */
int is_value_param_type(const ir_type *tp) {
        return tp->flags & tf_value_param_type;
}

/* Checks, whether a type is a lowered type */
int is_lowered_type(const ir_type *tp) {
        return tp->flags & tf_lowered_type;
}

/* Makes a new frame type. */
ir_type *new_type_frame(ident *name) {
        ir_type *res = new_type_class(name);

        res->flags |= tf_frame_type;

        /* Remove type from type list.  Must be treated differently than other types. */
        remove_irp_type(res);

        /* It is not possible to derive from the frame type. Set the final flag. */
        set_class_final(res, 1);

        return res;
}

/* Makes a clone of a frame type. */
ir_type *clone_frame_type(ir_type *type) {
        ir_type *res;
        int     i, n;

        assert(is_frame_type(type));

        res = new_type_frame(type->name);
        for (i = 0, n = get_class_n_members(type); i < n; ++i) {
                ir_entity *ent  = get_class_member(type, i);
                ir_entity *nent = copy_entity_own(ent, res);
                set_entity_link(ent, nent);
                set_entity_link(nent, ent);
        }
        return res;
}

/* Sets a lowered type for a type. This sets both associations. */
void set_lowered_type(ir_type *tp, ir_type *lowered_type) {
        assert(is_type(tp) && is_type(lowered_type));
        lowered_type->flags |= tf_lowered_type;
        tp->assoc_type = lowered_type;
        lowered_type->assoc_type = tp;
}

/*
 * Gets the lowered/unlowered type of a type or NULL if this type
 * has no lowered/unlowered one.
 */
ir_type *get_associated_type(const ir_type *tp) {
        return tp->assoc_type;
}

/* set the type size for the unknown and none ir_type */
void set_default_size(ir_type *tp, unsigned size) {
        tp->size = size;
}

/*
 * Allocate an area of size bytes aligned at alignment
 * at the start or the end of a frame type.
 * The frame type must have already an fixed layout.
 */
ir_entity *frame_alloc_area(ir_type *frame_type, int size, unsigned alignment, int at_start) {
        ir_entity *area;
        ir_type *tp;
        ident *name;
        char buf[32];
        unsigned frame_align;
        int i, offset, frame_size;
        static unsigned area_cnt = 0;
        static ir_type *a_byte = NULL;

        assert(is_frame_type(frame_type));
        assert(get_type_state(frame_type) == layout_fixed);
        assert(get_type_alignment_bytes(frame_type) > 0);
        set_type_state(frame_type, layout_undefined);

        if (! a_byte)
                a_byte = new_type_primitive(new_id_from_chars("byte", 4), mode_Bu);

        snprintf(buf, sizeof(buf), "area%u", area_cnt++);
        name = new_id_from_str(buf);

        /* align the size */
        frame_align = get_type_alignment_bytes(frame_type);
        size = (size + frame_align - 1) & ~(frame_align - 1);

        tp = new_type_array(mangle_u(get_type_ident(frame_type), name), 1, a_byte);
        set_array_bounds_int(tp, 0, 0, size);
        set_type_alignment_bytes(tp, alignment);

        frame_size = get_type_size_bytes(frame_type);
        if (at_start) {
                /* fix all offsets so far */
                for (i = get_class_n_members(frame_type) - 1; i >= 0; --i) {
                        ir_entity *ent = get_class_member(frame_type, i);

                        set_entity_offset(ent, get_entity_offset(ent) + size);
                }
                /* calculate offset and new type size */
                offset = 0;
                frame_size += size;

                /* increase size to match alignment... */
                if (alignment > frame_align) {
                        frame_align = alignment;
                        set_type_alignment_bytes(frame_type, frame_align);
                        frame_size  = (frame_size + frame_align - 1) & ~(frame_align - 1);
                }
        } else {
                /* calculate offset and new type size */
                offset = (frame_size + alignment - 1) & ~(alignment - 1);
                frame_size = offset + size;
        }

        area = new_entity(frame_type, name, tp);
        set_entity_offset(area, offset);
        set_type_size_bytes(frame_type, frame_size);

        /* mark this entity as compiler generated */
        set_entity_compiler_generated(area, 1);

        set_type_state(frame_type, layout_fixed);
        return area;
}