[libfirm] / ir / ir / irnode.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
 * @brief   Representation of an intermediate operation.
 * @author  Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Michael Beck
 * @version $Id$
 */
#include "config.h"

#include <string.h>

#include "pset_new.h"
#include "ident.h"
#include "irnode_t.h"
#include "irgraph_t.h"
#include "irmode_t.h"
#include "irbackedge_t.h"
#include "irdump.h"
#include "irop_t.h"
#include "irprog_t.h"
#include "iredgekinds.h"
#include "iredges_t.h"
#include "ircons.h"
#include "error.h"

#include "irhooks.h"
#include "irtools.h"

#include "beinfo.h"

/* some constants fixing the positions of nodes predecessors
   in the in array */
#define CALL_PARAM_OFFSET     2
#define BUILDIN_PARAM_OFFSET  1
#define SEL_INDEX_OFFSET      2
#define RETURN_RESULT_OFFSET  1  /* mem is not a result */
#define END_KEEPALIVE_OFFSET  0

static const char *pnc_name_arr [] = {
        "pn_Cmp_False", "pn_Cmp_Eq", "pn_Cmp_Lt", "pn_Cmp_Le",
        "pn_Cmp_Gt", "pn_Cmp_Ge", "pn_Cmp_Lg", "pn_Cmp_Leg",
        "pn_Cmp_Uo", "pn_Cmp_Ue", "pn_Cmp_Ul", "pn_Cmp_Ule",
        "pn_Cmp_Ug", "pn_Cmp_Uge", "pn_Cmp_Ne", "pn_Cmp_True"
};

/**
 * returns the pnc name from an pnc constant
 */
const char *get_pnc_string(int pnc)
{
        assert(pnc >= 0 && pnc <
                        (int) (sizeof(pnc_name_arr)/sizeof(pnc_name_arr[0])));
        return pnc_name_arr[pnc];
}

/*
 * Calculates the negated (Complement(R)) pnc condition.
 */
pn_Cmp get_negated_pnc(long pnc, ir_mode *mode)
{
        pnc ^= pn_Cmp_True;

        /* do NOT add the Uo bit for non-floating point values */
        if (! mode_is_float(mode))
                pnc &= ~pn_Cmp_Uo;

        return (pn_Cmp) pnc;
}

/* Calculates the inversed (R^-1) pnc condition, i.e., "<" --> ">" */
pn_Cmp get_inversed_pnc(long pnc)
{
        long code    = pnc & ~(pn_Cmp_Lt|pn_Cmp_Gt);
        long lesser  = pnc & pn_Cmp_Lt;
        long greater = pnc & pn_Cmp_Gt;

        code |= (lesser ? pn_Cmp_Gt : 0) | (greater ? pn_Cmp_Lt : 0);

        return (pn_Cmp) code;
}

/**
 * Indicates, whether additional data can be registered to ir nodes.
 * If set to 1, this is not possible anymore.
 */
static int forbid_new_data = 0;

/**
 * The amount of additional space for custom data to be allocated upon
 * creating a new node.
 */
unsigned firm_add_node_size = 0;


/* register new space for every node */
unsigned firm_register_additional_node_data(unsigned size)
{
        assert(!forbid_new_data && "Too late to register additional node data");

        if (forbid_new_data)
                return 0;

        return firm_add_node_size += size;
}


void init_irnode(void)
{
        /* Forbid the addition of new data to an ir node. */
        forbid_new_data = 1;
}

struct struct_align {
        char c;
        struct s {
                int i;
                float f;
                double d;
        } s;
};

/*
 * irnode constructor.
 * Create a new irnode in irg, with an op, mode, arity and
 * some incoming irnodes.
 * If arity is negative, a node with a dynamic array is created.
 */
ir_node *new_ir_node(dbg_info *db, ir_graph *irg, ir_node *block, ir_op *op,
                     ir_mode *mode, int arity, ir_node **in)
{
        ir_node *res;
        unsigned align = offsetof(struct struct_align, s) - 1;
        unsigned add_node_size = (firm_add_node_size + align) & ~align;
        size_t node_size = offsetof(ir_node, attr) + op->attr_size + add_node_size;
        char *p;
        int i;

        assert(irg);
        assert(op);
        assert(mode);
        p = obstack_alloc(irg->obst, node_size);
        memset(p, 0, node_size);
        res = (ir_node *)(p + add_node_size);

        res->kind     = k_ir_node;
        res->op       = op;
        res->mode     = mode;
        res->visited  = 0;
        res->node_idx = irg_register_node_idx(irg, res);
        res->link     = NULL;
        res->deps     = NULL;

        if (arity < 0) {
                res->in = NEW_ARR_F(ir_node *, 1);  /* 1: space for block */
        } else {
                /* not nice but necessary: End and Sync must always have a flexible array */
                if (op == op_End || op == op_Sync)
                        res->in = NEW_ARR_F(ir_node *, (arity+1));
                else
                        res->in = NEW_ARR_D(ir_node *, irg->obst, (arity+1));
                memcpy(&res->in[1], in, sizeof(ir_node *) * arity);
        }

        res->in[0]   = block;
        set_irn_dbg_info(res, db);
        res->out     = NULL;
        res->node_nr = get_irp_new_node_nr();

        for (i = 0; i < EDGE_KIND_LAST; ++i) {
                INIT_LIST_HEAD(&res->edge_info[i].outs_head);
                /* edges will be build immediately */
                res->edge_info[i].edges_built = 1;
                res->edge_info[i].out_count = 0;
        }

        /* don't put this into the for loop, arity is -1 for some nodes! */
        edges_notify_edge(res, -1, res->in[0], NULL, irg);
        for (i = 1; i <= arity; ++i)
                edges_notify_edge(res, i - 1, res->in[i], NULL, irg);

        hook_new_node(irg, res);
        if (get_irg_phase_state(irg) == phase_backend) {
                be_info_new_node(res);
        }

        return res;
}

/*-- getting some parameters from ir_nodes --*/

int (is_ir_node)(const void *thing)
{
        return _is_ir_node(thing);
}

int (get_irn_intra_arity)(const ir_node *node)
{
        return _get_irn_intra_arity(node);
}

int (get_irn_inter_arity)(const ir_node *node)
{
        return _get_irn_inter_arity(node);
}

int (*_get_irn_arity)(const ir_node *node) = _get_irn_intra_arity;

int (get_irn_arity)(const ir_node *node)
{
        return _get_irn_arity(node);
}

/* Returns the array with ins. This array is shifted with respect to the
   array accessed by get_irn_n: The block operand is at position 0 not -1.
   (@@@ This should be changed.)
   The order of the predecessors in this array is not guaranteed, except that
   lists of operands as predecessors of Block or arguments of a Call are
   consecutive. */
ir_node **get_irn_in(const ir_node *node)
{
        assert(node);
#ifdef INTERPROCEDURAL_VIEW
        if (get_interprocedural_view()) { /* handle Filter and Block specially */
                if (get_irn_opcode(node) == iro_Filter) {
                        assert(node->attr.filter.in_cg);
                        return node->attr.filter.in_cg;
                } else if (get_irn_opcode(node) == iro_Block && node->attr.block.in_cg) {
                        return node->attr.block.in_cg;
                }
                /* else fall through */
        }
#endif /* INTERPROCEDURAL_VIEW */
        return node->in;
}

void set_irn_in(ir_node *node, int arity, ir_node **in)
{
        int i;
        ir_node *** pOld_in;
        ir_graph *irg = get_irn_irg(node);

        assert(node);
#ifdef INTERPROCEDURAL_VIEW
        if (get_interprocedural_view()) { /* handle Filter and Block specially */
                ir_opcode code = get_irn_opcode(node);
                if (code  == iro_Filter) {
                        assert(node->attr.filter.in_cg);
                        pOld_in = &node->attr.filter.in_cg;
                } else if (code == iro_Block && node->attr.block.in_cg) {
                        pOld_in = &node->attr.block.in_cg;
                } else {
                        pOld_in = &node->in;
                }
        } else
#endif /* INTERPROCEDURAL_VIEW */
                pOld_in = &node->in;


        for (i = 0; i < arity; i++) {
                if (i < ARR_LEN(*pOld_in)-1)
                        edges_notify_edge(node, i, in[i], (*pOld_in)[i+1], irg);
                else
                        edges_notify_edge(node, i, in[i], NULL,            irg);
        }
        for (;i < ARR_LEN(*pOld_in)-1; i++) {
                edges_notify_edge(node, i, NULL, (*pOld_in)[i+1], irg);
        }

        if (arity != ARR_LEN(*pOld_in) - 1) {
                ir_node * block = (*pOld_in)[0];
                *pOld_in = NEW_ARR_D(ir_node *, irg->obst, arity + 1);
                (*pOld_in)[0] = block;
        }
        fix_backedges(irg->obst, node);

        memcpy((*pOld_in) + 1, in, sizeof(ir_node *) * arity);
}

ir_node *(get_irn_intra_n)(const ir_node *node, int n)
{
        return _get_irn_intra_n(node, n);
}

ir_node *(get_irn_inter_n)(const ir_node *node, int n)
{
        return _get_irn_inter_n(node, n);
}

ir_node *(*_get_irn_n)(const ir_node *node, int n) = _get_irn_intra_n;

ir_node *(get_irn_n)(const ir_node *node, int n)
{
        return _get_irn_n(node, n);
}

void set_irn_n(ir_node *node, int n, ir_node *in)
{
        assert(node && node->kind == k_ir_node);
        assert(-1 <= n);
        assert(n < get_irn_arity(node));
        assert(in && in->kind == k_ir_node);

#ifdef INTERPROCEDURAL_VIEW
        if ((n == -1) && (get_irn_opcode(node) == iro_Filter)) {
                /* Change block pred in both views! */
                node->in[n + 1] = in;
                assert(node->attr.filter.in_cg);
                node->attr.filter.in_cg[n + 1] = in;
                return;
        }
        if (get_interprocedural_view()) { /* handle Filter and Block specially */
                if (get_irn_opcode(node) == iro_Filter) {
                        assert(node->attr.filter.in_cg);
                        node->attr.filter.in_cg[n + 1] = in;
                        return;
                } else if (get_irn_opcode(node) == iro_Block && node->attr.block.in_cg) {
                        node->attr.block.in_cg[n + 1] = in;
                        return;
                }
                /* else fall through */
        }
#endif /* INTERPROCEDURAL_VIEW */

        /* Call the hook */
        hook_set_irn_n(node, n, in, node->in[n + 1]);

        /* Here, we rely on src and tgt being in the current ir graph */
        edges_notify_edge(node, n, in, node->in[n + 1], current_ir_graph);

        node->in[n + 1] = in;
}

int add_irn_n(ir_node *node, ir_node *in)
{
        int pos;
        ir_graph *irg = get_irn_irg(node);

        assert(node->op->opar == oparity_dynamic);
        pos = ARR_LEN(node->in) - 1;
        ARR_APP1(ir_node *, node->in, in);
        edges_notify_edge(node, pos, node->in[pos + 1], NULL, irg);

        /* Call the hook */
        hook_set_irn_n(node, pos, node->in[pos + 1], NULL);

        return pos;
}

void del_Sync_n(ir_node *n, int i)
{
        int      arity     = get_Sync_n_preds(n);
        ir_node *last_pred = get_Sync_pred(n, arity - 1);
        set_Sync_pred(n, i, last_pred);
        edges_notify_edge(n, arity - 1, NULL, last_pred, get_irn_irg(n));
        ARR_SHRINKLEN(get_irn_in(n), arity);
}

int (get_irn_deps)(const ir_node *node)
{
        return _get_irn_deps(node);
}

ir_node *(get_irn_dep)(const ir_node *node, int pos)
{
        return _get_irn_dep(node, pos);
}

void (set_irn_dep)(ir_node *node, int pos, ir_node *dep)
{
        _set_irn_dep(node, pos, dep);
}

int add_irn_dep(ir_node *node, ir_node *dep)
{
        int res = 0;

        /* DEP edges are only allowed in backend phase */
        assert(get_irg_phase_state(get_irn_irg(node)) == phase_backend);
        if (node->deps == NULL) {
                node->deps = NEW_ARR_F(ir_node *, 1);
                node->deps[0] = dep;
        } else {
                int i, n;
                int first_zero = -1;

                for (i = 0, n = ARR_LEN(node->deps); i < n; ++i) {
                        if (node->deps[i] == NULL)
                                first_zero = i;

                        if (node->deps[i] == dep)
                                return i;
                }

                if (first_zero >= 0) {
                        node->deps[first_zero] = dep;
                        res = first_zero;
                } else {
                        ARR_APP1(ir_node *, node->deps, dep);
                        res = n;
                }
        }

        edges_notify_edge_kind(node, res, dep, NULL, EDGE_KIND_DEP, get_irn_irg(node));

        return res;
}

void add_irn_deps(ir_node *tgt, ir_node *src)
{
        int i, n;

        for (i = 0, n = get_irn_deps(src); i < n; ++i)
                add_irn_dep(tgt, get_irn_dep(src, i));
}


ir_mode *(get_irn_mode)(const ir_node *node)
{
        return _get_irn_mode(node);
}

void (set_irn_mode)(ir_node *node, ir_mode *mode)
{
        _set_irn_mode(node, mode);
}

/** Gets the string representation of the mode .*/
const char *get_irn_modename(const ir_node *node)
{
        assert(node);
        return get_mode_name(node->mode);
}

ident *get_irn_modeident(const ir_node *node)
{
        assert(node);
        return get_mode_ident(node->mode);
}

ir_op *(get_irn_op)(const ir_node *node)
{
        return _get_irn_op(node);
}

/* should be private to the library: */
void (set_irn_op)(ir_node *node, ir_op *op)
{
        _set_irn_op(node, op);
}

unsigned (get_irn_opcode)(const ir_node *node)
{
        return _get_irn_opcode(node);
}

const char *get_irn_opname(const ir_node *node)
{
        assert(node);
        if (is_Phi0(node)) return "Phi0";
        return get_id_str(node->op->name);
}

ident *get_irn_opident(const ir_node *node)
{
        assert(node);
        return node->op->name;
}

ir_visited_t (get_irn_visited)(const ir_node *node)
{
        return _get_irn_visited(node);
}

void (set_irn_visited)(ir_node *node, ir_visited_t visited)
{
        _set_irn_visited(node, visited);
}

void (mark_irn_visited)(ir_node *node)
{
        _mark_irn_visited(node);
}

int (irn_visited)(const ir_node *node)
{
        return _irn_visited(node);
}

int (irn_visited_else_mark)(ir_node *node)
{
        return _irn_visited_else_mark(node);
}

void (set_irn_link)(ir_node *node, void *link)
{
        _set_irn_link(node, link);
}

void *(get_irn_link)(const ir_node *node)
{
        return _get_irn_link(node);
}

op_pin_state (get_irn_pinned)(const ir_node *node)
{
        return _get_irn_pinned(node);
}

op_pin_state (is_irn_pinned_in_irg) (const ir_node *node)
{
        return _is_irn_pinned_in_irg(node);
}

void set_irn_pinned(ir_node *node, op_pin_state state)
{
        /* due to optimization an opt may be turned into a Tuple */
        if (is_Tuple(node))
                return;

        assert(node && get_op_pinned(get_irn_op(node)) >= op_pin_state_exc_pinned);
        assert(state == op_pin_state_pinned || state == op_pin_state_floats);

        node->attr.except.pin_state = state;
}

/* Outputs a unique number for this node */
long get_irn_node_nr(const ir_node *node)
{
        assert(node);
        return node->node_nr;
}

const_attr *get_irn_const_attr(ir_node *node)
{
        assert(is_Const(node));
        return &node->attr.con;
}

long get_irn_proj_attr(ir_node *node)
{
        /* BEWARE: check for true Proj node here, no Filter */
        assert(node->op == op_Proj);
        return node->attr.proj;
}

alloc_attr *get_irn_alloc_attr(ir_node *node)
{
        assert(is_Alloc(node));
        return &node->attr.alloc;
}

free_attr *get_irn_free_attr(ir_node *node)
{
        assert(is_Free(node));
        return &node->attr.free;
}

symconst_attr *get_irn_symconst_attr(ir_node *node)
{
        assert(is_SymConst(node));
        return &node->attr.symc;
}

call_attr *get_irn_call_attr(ir_node *node)
{
        assert(is_Call(node));
        return &node->attr.call;
}

sel_attr *get_irn_sel_attr(ir_node *node)
{
        assert(is_Sel(node));
        return &node->attr.sel;
}

phi_attr *get_irn_phi_attr(ir_node *node)
{
        return &node->attr.phi;
}

block_attr *get_irn_block_attr(ir_node *node)
{
        assert(is_Block(node));
        return &node->attr.block;
}

load_attr *get_irn_load_attr(ir_node *node)
{
        assert(is_Load(node));
        return &node->attr.load;
}

store_attr *get_irn_store_attr(ir_node *node)
{
        assert(is_Store(node));
        return &node->attr.store;
}

except_attr *get_irn_except_attr(ir_node *node)
{
        assert(node->op == op_Div || node->op == op_Quot ||
               node->op == op_DivMod || node->op == op_Mod || node->op == op_Call || node->op == op_Alloc || node->op == op_Bound);
        return &node->attr.except;
}

divmod_attr *get_irn_divmod_attr(ir_node *node)
{
        assert(node->op == op_Div || node->op == op_Quot ||
               node->op == op_DivMod || node->op == op_Mod);
        return &node->attr.divmod;
}

builtin_attr *get_irn_builtin_attr(ir_node *node)
{
        assert(is_Builtin(node));
        return &node->attr.builtin;
}

void *(get_irn_generic_attr)(ir_node *node)
{
        assert(is_ir_node(node));
        return _get_irn_generic_attr(node);
}

const void *(get_irn_generic_attr_const)(const ir_node *node)
{
        assert(is_ir_node(node));
        return _get_irn_generic_attr_const(node);
}

unsigned (get_irn_idx)(const ir_node *node)
{
        assert(is_ir_node(node));
        return _get_irn_idx(node);
}

int get_irn_pred_pos(ir_node *node, ir_node *arg)
{
        int i;
        for (i = get_irn_arity(node) - 1; i >= 0; i--) {
                if (get_irn_n(node, i) == arg)
                        return i;
        }
        return -1;
}

/** manipulate fields of individual nodes **/

/* this works for all except Block */
ir_node *get_nodes_block(const ir_node *node)
{
        assert(node->op != op_Block);
        return get_irn_n(node, -1);
}

void set_nodes_block(ir_node *node, ir_node *block)
{
        assert(node->op != op_Block);
        set_irn_n(node, -1, block);
}

/* this works for all except Block */
ir_node *get_nodes_MacroBlock(const ir_node *node)
{
        assert(node->op != op_Block);
        return get_Block_MacroBlock(get_irn_n(node, -1));
}

/* Test whether arbitrary node is frame pointer, i.e. Proj(pn_Start_P_frame_base)
 * from Start.  If so returns frame type, else Null. */
ir_type *is_frame_pointer(const ir_node *n)
{
        if (is_Proj(n) && (get_Proj_proj(n) == pn_Start_P_frame_base)) {
                ir_node *start = get_Proj_pred(n);
                if (is_Start(start)) {
                        return get_irg_frame_type(get_irn_irg(start));
                }
        }
        return NULL;
}

/* Test whether arbitrary node is tls pointer, i.e. Proj(pn_Start_P_tls)
 * from Start.  If so returns tls type, else Null. */
ir_type *is_tls_pointer(const ir_node *n)
{
        if (is_Proj(n) && (get_Proj_proj(n) == pn_Start_P_tls)) {
                ir_node *start = get_Proj_pred(n);
                if (is_Start(start)) {
                        return get_tls_type();
                }
        }
        return NULL;
}

ir_node **get_Block_cfgpred_arr(ir_node *node)
{
        assert(is_Block(node));
        return (ir_node **)&(get_irn_in(node)[1]);
}

int (get_Block_n_cfgpreds)(const ir_node *node)
{
        return _get_Block_n_cfgpreds(node);
}

ir_node *(get_Block_cfgpred)(const ir_node *node, int pos)
{
        return _get_Block_cfgpred(node, pos);
}

void set_Block_cfgpred(ir_node *node, int pos, ir_node *pred)
{
        assert(is_Block(node));
        set_irn_n(node, pos, pred);
}

int get_Block_cfgpred_pos(const ir_node *block, const ir_node *pred)
{
        int i;

        for (i = get_Block_n_cfgpreds(block) - 1; i >= 0; --i) {
                if (get_Block_cfgpred_block(block, i) == pred)
                        return i;
        }
        return -1;
}

ir_node *(get_Block_cfgpred_block)(const ir_node *node, int pos)
{
        return _get_Block_cfgpred_block(node, pos);
}

int get_Block_matured(const ir_node *node)
{
        assert(is_Block(node));
        return (int)node->attr.block.is_matured;
}

void set_Block_matured(ir_node *node, int matured)
{
        assert(is_Block(node));
        node->attr.block.is_matured = matured;
}

ir_visited_t (get_Block_block_visited)(const ir_node *node)
{
        return _get_Block_block_visited(node);
}

void (set_Block_block_visited)(ir_node *node, ir_visited_t visit)
{
        _set_Block_block_visited(node, visit);
}

/* For this current_ir_graph must be set. */
void (mark_Block_block_visited)(ir_node *node)
{
        _mark_Block_block_visited(node);
}

int (Block_block_visited)(const ir_node *node)
{
        return _Block_block_visited(node);
}

#ifdef INTERPROCEDURAL_VIEW
void set_Block_cg_cfgpred_arr(ir_node *node, int arity, ir_node *in[])
{
        assert(is_Block(node));
        if (node->attr.block.in_cg == NULL || arity != ARR_LEN(node->attr.block.in_cg) - 1) {
                node->attr.block.in_cg = NEW_ARR_D(ir_node *, current_ir_graph->obst, arity + 1);
                node->attr.block.in_cg[0] = NULL;
                node->attr.block.cg_backedge = new_backedge_arr(current_ir_graph->obst, arity);
                {
                        /* Fix backedge array.  fix_backedges() operates depending on
                           interprocedural_view. */
                        int ipv = get_interprocedural_view();
                        set_interprocedural_view(1);
                        fix_backedges(current_ir_graph->obst, node);
                        set_interprocedural_view(ipv);
                }
        }
        memcpy(node->attr.block.in_cg + 1, in, sizeof(ir_node *) * arity);
}

void set_Block_cg_cfgpred(ir_node *node, int pos, ir_node *pred)
{
        assert(is_Block(node) && node->attr.block.in_cg &&
               0 <= pos && pos < ARR_LEN(node->attr.block.in_cg) - 1);
        node->attr.block.in_cg[pos + 1] = pred;
}

ir_node **get_Block_cg_cfgpred_arr(ir_node *node)
{
        assert(is_Block(node));
        return node->attr.block.in_cg == NULL ? NULL : node->attr.block.in_cg  + 1;
}

int get_Block_cg_n_cfgpreds(const ir_node *node)
{
        assert(is_Block(node));
        return node->attr.block.in_cg == NULL ? 0 : ARR_LEN(node->attr.block.in_cg) - 1;
}

ir_node *get_Block_cg_cfgpred(const ir_node *node, int pos)
{
        assert(is_Block(node) && node->attr.block.in_cg);
        return node->attr.block.in_cg[pos + 1];
}

void remove_Block_cg_cfgpred_arr(ir_node *node)
{
        assert(is_Block(node));
        node->attr.block.in_cg = NULL;
}
#endif /* INTERPROCEDURAL_VIEW */

ir_node *(set_Block_dead)(ir_node *block)
{
        return _set_Block_dead(block);
}

int (is_Block_dead)(const ir_node *block)
{
        return _is_Block_dead(block);
}

ir_extblk *get_Block_extbb(const ir_node *block)
{
        ir_extblk *res;
        assert(is_Block(block));
        res = block->attr.block.extblk;
        assert(res == NULL || is_ir_extbb(res));
        return res;
}

void set_Block_extbb(ir_node *block, ir_extblk *extblk)
{
        assert(is_Block(block));
        assert(extblk == NULL || is_ir_extbb(extblk));
        block->attr.block.extblk = extblk;
}

/* Returns the macro block header of a block.*/
ir_node *get_Block_MacroBlock(const ir_node *block)
{
        ir_node *mbh;
        assert(is_Block(block));
        mbh = get_irn_n(block, -1);
        /* once macro block header is respected by all optimizations,
           this assert can be removed */
        assert(mbh != NULL);
        return mbh;
}

/* Sets the macro block header of a block. */
void set_Block_MacroBlock(ir_node *block, ir_node *mbh)
{
        assert(is_Block(block));
        mbh = skip_Id(mbh);
        assert(is_Block(mbh));
        set_irn_n(block, -1, mbh);
}

/* returns the macro block header of a node. */
ir_node *get_irn_MacroBlock(const ir_node *n)
{
        if (! is_Block(n)) {
                n = get_nodes_block(n);
                /* if the Block is Bad, do NOT try to get it's MB, it will fail. */
                if (is_Bad(n))
                        return (ir_node *)n;
        }
        return get_Block_MacroBlock(n);
}

/* returns the graph of a Block. */
ir_graph *(get_Block_irg)(const ir_node *block)
{
        return _get_Block_irg(block);
}

ir_entity *create_Block_entity(ir_node *block)
{
        ir_entity *entity;
        assert(is_Block(block));

        entity = block->attr.block.entity;
        if (entity == NULL) {
                ir_label_t  nr;
                ir_type   *glob;

                glob = get_glob_type();
                entity = new_entity(glob, id_unique("block_%u"), get_code_type());
                set_entity_visibility(entity, ir_visibility_local);
                set_entity_linkage(entity, IR_LINKAGE_CONSTANT);
                nr = get_irp_next_label_nr();
                set_entity_label(entity, nr);
                set_entity_compiler_generated(entity, 1);

                block->attr.block.entity = entity;
        }
        return entity;
}

ir_entity *get_Block_entity(const ir_node *block)
{
        assert(is_Block(block));
        return block->attr.block.entity;
}

void set_Block_entity(ir_node *block, ir_entity *entity)
{
        assert(is_Block(block));
        assert(get_entity_type(entity) == get_code_type());
        block->attr.block.entity = entity;
}

int has_Block_entity(const ir_node *block)
{
        return block->attr.block.entity != NULL;
}

ir_node *(get_Block_phis)(const ir_node *block)
{
        return _get_Block_phis(block);
}

void (set_Block_phis)(ir_node *block, ir_node *phi)
{
        _set_Block_phis(block, phi);
}

void (add_Block_phi)(ir_node *block, ir_node *phi)
{
        _add_Block_phi(block, phi);
}

/* Get the Block mark (single bit). */
unsigned (get_Block_mark)(const ir_node *block)
{
        return _get_Block_mark(block);
}

/* Set the Block mark (single bit). */
void (set_Block_mark)(ir_node *block, unsigned mark)
{
        _set_Block_mark(block, mark);
}

int get_End_n_keepalives(const ir_node *end)
{
        assert(is_End(end));
        return (get_irn_arity(end) - END_KEEPALIVE_OFFSET);
}

ir_node *get_End_keepalive(const ir_node *end, int pos)
{
        assert(is_End(end));
        return get_irn_n(end, pos + END_KEEPALIVE_OFFSET);
}

void add_End_keepalive(ir_node *end, ir_node *ka)
{
        assert(is_End(end));
        add_irn_n(end, ka);
}

void set_End_keepalive(ir_node *end, int pos, ir_node *ka)
{
        assert(is_End(end));
        set_irn_n(end, pos + END_KEEPALIVE_OFFSET, ka);
}

/* Set new keep-alives */
void set_End_keepalives(ir_node *end, int n, ir_node *in[])
{
        int i;
        ir_graph *irg = get_irn_irg(end);

        /* notify that edges are deleted */
        for (i = END_KEEPALIVE_OFFSET; i < ARR_LEN(end->in) - 1; ++i) {
                edges_notify_edge(end, i, NULL, end->in[i + 1], irg);
        }
        ARR_RESIZE(ir_node *, end->in, n + 1 + END_KEEPALIVE_OFFSET);

        for (i = 0; i < n; ++i) {
                end->in[1 + END_KEEPALIVE_OFFSET + i] = in[i];
                edges_notify_edge(end, END_KEEPALIVE_OFFSET + i, end->in[1 + END_KEEPALIVE_OFFSET + i], NULL, irg);
        }
}

/* Set new keep-alives from old keep-alives, skipping irn */
void remove_End_keepalive(ir_node *end, ir_node *irn)
{
        int      n = get_End_n_keepalives(end);
        int      i, idx;
        ir_graph *irg;

        idx = -1;
        for (i = n -1; i >= 0; --i) {
                ir_node *old_ka = end->in[1 + END_KEEPALIVE_OFFSET + i];

                /* find irn */
                if (old_ka == irn) {
                        idx = i;
                        goto found;
                }
        }
        return;
found:
        irg = get_irn_irg(end);

        /* remove the edge */
        edges_notify_edge(end, idx, NULL, irn, irg);

        if (idx != n - 1) {
                /* exchange with the last one */
                ir_node *old = end->in[1 + END_KEEPALIVE_OFFSET + n - 1];
                edges_notify_edge(end, n - 1, NULL, old, irg);
                end->in[1 + END_KEEPALIVE_OFFSET + idx] = old;
                edges_notify_edge(end, idx, old, NULL, irg);
        }
        /* now n - 1 keeps, 1 block input */
        ARR_RESIZE(ir_node *, end->in, (n - 1) + 1 + END_KEEPALIVE_OFFSET);
}

/* remove Bads, NoMems and doublets from the keep-alive set */
void remove_End_Bads_and_doublets(ir_node *end)
{
        pset_new_t keeps;
        int        idx, n = get_End_n_keepalives(end);
        ir_graph   *irg;

        if (n <= 0)
                return;

        irg = get_irn_irg(end);
        pset_new_init(&keeps);

        for (idx = n - 1; idx >= 0; --idx) {
                ir_node *ka = get_End_keepalive(end, idx);

                if (is_Bad(ka) || is_NoMem(ka) || pset_new_contains(&keeps, ka)) {
                        /* remove the edge */
                        edges_notify_edge(end, idx, NULL, ka, irg);

                        if (idx != n - 1) {
                                /* exchange with the last one */
                                ir_node *old = end->in[1 + END_KEEPALIVE_OFFSET + n - 1];
                                edges_notify_edge(end, n - 1, NULL, old, irg);
                                end->in[1 + END_KEEPALIVE_OFFSET + idx] = old;
                                edges_notify_edge(end, idx, old, NULL, irg);
                        }
                        --n;
                } else {
                        pset_new_insert(&keeps, ka);
                }
        }
        /* n keeps, 1 block input */
        ARR_RESIZE(ir_node *, end->in, n + 1 + END_KEEPALIVE_OFFSET);

        pset_new_destroy(&keeps);
}

void free_End(ir_node *end)
{
        assert(is_End(end));
        end->kind = k_BAD;
        DEL_ARR_F(end->in);
        end->in = NULL;   /* @@@ make sure we get an error if we use the
                             in array afterwards ... */
}

/* Return the target address of an IJmp */
ir_node *get_IJmp_target(const ir_node *ijmp)
{
        assert(is_IJmp(ijmp));
        return get_irn_n(ijmp, 0);
}

/** Sets the target address of an IJmp */
void set_IJmp_target(ir_node *ijmp, ir_node *tgt)
{
        assert(is_IJmp(ijmp));
        set_irn_n(ijmp, 0, tgt);
}

ir_node *get_Cond_selector(const ir_node *node)
{
        assert(is_Cond(node));
        return get_irn_n(node, 0);
}

void set_Cond_selector(ir_node *node, ir_node *selector)
{
        assert(is_Cond(node));
        set_irn_n(node, 0, selector);
}

long get_Cond_default_proj(const ir_node *node)
{
        assert(is_Cond(node));
        return node->attr.cond.default_proj;
}

void set_Cond_default_proj(ir_node *node, long defproj)
{
        assert(is_Cond(node));
        node->attr.cond.default_proj = defproj;
}

ir_node *get_Return_mem(const ir_node *node)
{
        assert(is_Return(node));
        return get_irn_n(node, 0);
}

void set_Return_mem(ir_node *node, ir_node *mem)
{
        assert(is_Return(node));
        set_irn_n(node, 0, mem);
}

int get_Return_n_ress(const ir_node *node)
{
        assert(is_Return(node));
        return (get_irn_arity(node) - RETURN_RESULT_OFFSET);
}

ir_node **get_Return_res_arr(ir_node *node)
{
        assert(is_Return(node));
        if (get_Return_n_ress(node) > 0)
                return (ir_node **)&(get_irn_in(node)[1 + RETURN_RESULT_OFFSET]);
        else
                return NULL;
}

/*
void set_Return_n_res(ir_node *node, int results)
{
        assert(is_Return(node));
}
*/

ir_node *get_Return_res(const ir_node *node, int pos)
{
        assert(is_Return(node));
        assert(get_Return_n_ress(node) > pos);
        return get_irn_n(node, pos + RETURN_RESULT_OFFSET);
}

void set_Return_res(ir_node *node, int pos, ir_node *res)
{
        assert(is_Return(node));
        set_irn_n(node, pos + RETURN_RESULT_OFFSET, res);
}

tarval *(get_Const_tarval)(const ir_node *node)
{
        return _get_Const_tarval(node);
}

void set_Const_tarval(ir_node *node, tarval *con)
{
        assert(is_Const(node));
        node->attr.con.tv = con;
}

int (is_Const_null)(const ir_node *node)
{
        return _is_Const_null(node);
}

int (is_Const_one)(const ir_node *node)
{
        return _is_Const_one(node);
}

int (is_Const_all_one)(const ir_node *node)
{
        return _is_Const_all_one(node);
}


/* The source language type.  Must be an atomic type.  Mode of type must
   be mode of node. For tarvals from entities type must be pointer to
   entity type. */
ir_type *get_Const_type(ir_node *node)
{
        assert(is_Const(node));
        return node->attr.con.tp;
}

void set_Const_type(ir_node *node, ir_type *tp)
{
        assert(is_Const(node));
        if (tp != firm_unknown_type) {
                assert(is_atomic_type(tp));
                assert(get_type_mode(tp) == get_irn_mode(node));
        }
        node->attr.con.tp = tp;
}


symconst_kind get_SymConst_kind(const ir_node *node)
{
        assert(is_SymConst(node));
        return node->attr.symc.kind;
}

void set_SymConst_kind(ir_node *node, symconst_kind kind)
{
        assert(is_SymConst(node));
        node->attr.symc.kind = kind;
}

ir_type *get_SymConst_type(const ir_node *node)
{
        /* the cast here is annoying, but we have to compensate for
           the skip_tip() */
        ir_node *irn = (ir_node *)node;
        assert(is_SymConst(node) &&
               (SYMCONST_HAS_TYPE(get_SymConst_kind(node))));
        return irn->attr.symc.sym.type_p;
}

void set_SymConst_type(ir_node *node, ir_type *tp)
{
        assert(is_SymConst(node) &&
               (SYMCONST_HAS_TYPE(get_SymConst_kind(node))));
        node->attr.symc.sym.type_p = tp;
}


/* Only to access SymConst of kind symconst_addr_ent.  Else assertion: */
ir_entity *get_SymConst_entity(const ir_node *node)
{
        assert(is_SymConst(node) && SYMCONST_HAS_ENT(get_SymConst_kind(node)));
        return node->attr.symc.sym.entity_p;
}

void set_SymConst_entity(ir_node *node, ir_entity *ent)
{
        assert(is_SymConst(node) && SYMCONST_HAS_ENT(get_SymConst_kind(node)));
        node->attr.symc.sym.entity_p  = ent;
}

ir_enum_const *get_SymConst_enum(const ir_node *node)
{
        assert(is_SymConst(node) && SYMCONST_HAS_ENUM(get_SymConst_kind(node)));
        return node->attr.symc.sym.enum_p;
}

void set_SymConst_enum(ir_node *node, ir_enum_const *ec)
{
        assert(is_SymConst(node) && SYMCONST_HAS_ENUM(get_SymConst_kind(node)));
        node->attr.symc.sym.enum_p  = ec;
}

union symconst_symbol
get_SymConst_symbol(const ir_node *node)
{
        assert(is_SymConst(node));
        return node->attr.symc.sym;
}

void set_SymConst_symbol(ir_node *node, union symconst_symbol sym)
{
        assert(is_SymConst(node));
        node->attr.symc.sym = sym;
}

ir_type *get_SymConst_value_type(ir_node *node)
{
        assert(is_SymConst(node));
        return node->attr.symc.tp;
}

void set_SymConst_value_type(ir_node *node, ir_type *tp)
{
        assert(is_SymConst(node));
        node->attr.symc.tp = tp;
}

ir_node *get_Sel_mem(const ir_node *node)
{
        assert(is_Sel(node));
        return get_irn_n(node, 0);
}

void set_Sel_mem(ir_node *node, ir_node *mem)
{
        assert(is_Sel(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Sel_ptr(const ir_node *node)
{
        assert(is_Sel(node));
        return get_irn_n(node, 1);
}

void set_Sel_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_Sel(node));
        set_irn_n(node, 1, ptr);
}

int get_Sel_n_indexs(const ir_node *node)
{
        assert(is_Sel(node));
        return (get_irn_arity(node) - SEL_INDEX_OFFSET);
}

ir_node **get_Sel_index_arr(ir_node *node)
{
        assert(is_Sel(node));
        if (get_Sel_n_indexs(node) > 0)
                return (ir_node **)& get_irn_in(node)[SEL_INDEX_OFFSET + 1];
        else
                return NULL;
}

ir_node *get_Sel_index(const ir_node *node, int pos)
{
        assert(is_Sel(node));
        return get_irn_n(node, pos + SEL_INDEX_OFFSET);
}

void set_Sel_index(ir_node *node, int pos, ir_node *index)
{
        assert(is_Sel(node));
        set_irn_n(node, pos + SEL_INDEX_OFFSET, index);
}

ir_entity *get_Sel_entity(const ir_node *node)
{
        assert(is_Sel(node));
        return node->attr.sel.entity;
}

/* need a version without const to prevent warning */
static ir_entity *_get_Sel_entity(ir_node *node)
{
        return get_Sel_entity(node);
}

void set_Sel_entity(ir_node *node, ir_entity *ent)
{
        assert(is_Sel(node));
        node->attr.sel.entity = ent;
}


/* For unary and binary arithmetic operations the access to the
   operands can be factored out.  Left is the first, right the
   second arithmetic value  as listed in tech report 0999-33.
   unops are: Minus, Abs, Not, Conv, Cast
   binops are: Add, Sub, Mul, Quot, DivMod, Div, Mod, And, Or, Eor, Shl,
   Shr, Shrs, Rotate, Cmp */


ir_node *get_Call_mem(const ir_node *node)
{
        assert(is_Call(node));
        return get_irn_n(node, 0);
}

void set_Call_mem(ir_node *node, ir_node *mem)
{
        assert(is_Call(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Call_ptr(const ir_node *node)
{
        assert(is_Call(node));
        return get_irn_n(node, 1);
}

void set_Call_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_Call(node));
        set_irn_n(node, 1, ptr);
}

ir_node **get_Call_param_arr(ir_node *node)
{
        assert(is_Call(node));
        return &get_irn_in(node)[CALL_PARAM_OFFSET + 1];
}

int get_Call_n_params(const ir_node *node)
{
        assert(is_Call(node));
        return (get_irn_arity(node) - CALL_PARAM_OFFSET);
}

ir_node *get_Call_param(const ir_node *node, int pos)
{
        assert(is_Call(node));
        return get_irn_n(node, pos + CALL_PARAM_OFFSET);
}

void set_Call_param(ir_node *node, int pos, ir_node *param)
{
        assert(is_Call(node));
        set_irn_n(node, pos + CALL_PARAM_OFFSET, param);
}

ir_type *get_Call_type(ir_node *node)
{
        assert(is_Call(node));
        return node->attr.call.type;
}

void set_Call_type(ir_node *node, ir_type *tp)
{
        assert(is_Call(node));
        assert((get_unknown_type() == tp) || is_Method_type(tp));
        node->attr.call.type = tp;
}

unsigned get_Call_tail_call(const ir_node *node)
{
        assert(is_Call(node));
        return node->attr.call.tail_call;
}

void set_Call_tail_call(ir_node *node, unsigned tail_call)
{
        assert(is_Call(node));
        node->attr.call.tail_call = tail_call != 0;
}

ir_node *get_Builtin_mem(const ir_node *node)
{
        assert(is_Builtin(node));
        return get_irn_n(node, 0);
}

void set_Builtin_mem(ir_node *node, ir_node *mem)
{
        assert(is_Builtin(node));
        set_irn_n(node, 0, mem);
}

ir_builtin_kind get_Builtin_kind(const ir_node *node)
{
        assert(is_Builtin(node));
        return node->attr.builtin.kind;
}

void set_Builtin_kind(ir_node *node, ir_builtin_kind kind)
{
        assert(is_Builtin(node));
        node->attr.builtin.kind = kind;
}

ir_node **get_Builtin_param_arr(ir_node *node)
{
        assert(is_Builtin(node));
        return &get_irn_in(node)[BUILDIN_PARAM_OFFSET + 1];
}

int get_Builtin_n_params(const ir_node *node)
{
        assert(is_Builtin(node));
        return (get_irn_arity(node) - BUILDIN_PARAM_OFFSET);
}

ir_node *get_Builtin_param(const ir_node *node, int pos)
{
        assert(is_Builtin(node));
        return get_irn_n(node, pos + BUILDIN_PARAM_OFFSET);
}

void set_Builtin_param(ir_node *node, int pos, ir_node *param)
{
        assert(is_Builtin(node));
        set_irn_n(node, pos + BUILDIN_PARAM_OFFSET, param);
}

ir_type *get_Builtin_type(ir_node *node)
{
        assert(is_Builtin(node));
        return node->attr.builtin.type;
}

void set_Builtin_type(ir_node *node, ir_type *tp)
{
        assert(is_Builtin(node));
        assert((get_unknown_type() == tp) || is_Method_type(tp));
        node->attr.builtin.type = tp;
}

/* Returns a human readable string for the ir_builtin_kind. */
const char *get_builtin_kind_name(ir_builtin_kind kind)
{
#define X(a)    case a: return #a
        switch (kind) {
                X(ir_bk_trap);
                X(ir_bk_debugbreak);
                X(ir_bk_return_address);
                X(ir_bk_frame_address);
                X(ir_bk_prefetch);
                X(ir_bk_ffs);
                X(ir_bk_clz);
                X(ir_bk_ctz);
                X(ir_bk_popcount);
                X(ir_bk_parity);
                X(ir_bk_bswap);
                X(ir_bk_inport);
                X(ir_bk_outport);
                X(ir_bk_inner_trampoline);
        }
        return "<unknown>";
#undef X
}


int Call_has_callees(const ir_node *node)
{
        assert(is_Call(node));
        return ((get_irg_callee_info_state(get_irn_irg(node)) != irg_callee_info_none) &&
                (node->attr.call.callee_arr != NULL));
}

int get_Call_n_callees(const ir_node *node)
{
  assert(is_Call(node) && node->attr.call.callee_arr);
  return ARR_LEN(node->attr.call.callee_arr);
}

ir_entity *get_Call_callee(const ir_node *node, int pos)
{
        assert(pos >= 0 && pos < get_Call_n_callees(node));
        return node->attr.call.callee_arr[pos];
}

void set_Call_callee_arr(ir_node *node, const int n, ir_entity ** arr)
{
        assert(is_Call(node));
        if (node->attr.call.callee_arr == NULL || get_Call_n_callees(node) != n) {
                node->attr.call.callee_arr = NEW_ARR_D(ir_entity *, current_ir_graph->obst, n);
        }
        memcpy(node->attr.call.callee_arr, arr, n * sizeof(ir_entity *));
}

void remove_Call_callee_arr(ir_node *node)
{
        assert(is_Call(node));
        node->attr.call.callee_arr = NULL;
}

ir_node *get_CallBegin_ptr(const ir_node *node)
{
        assert(is_CallBegin(node));
        return get_irn_n(node, 0);
}

void set_CallBegin_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_CallBegin(node));
        set_irn_n(node, 0, ptr);
}

ir_node *get_CallBegin_call(const ir_node *node)
{
        assert(is_CallBegin(node));
        return node->attr.callbegin.call;
}

void set_CallBegin_call(ir_node *node, ir_node *call)
{
        assert(is_CallBegin(node));
        node->attr.callbegin.call = call;
}

/*
 * Returns non-zero if a Call is surely a self-recursive Call.
 * Beware: if this functions returns 0, the call might be self-recursive!
 */
int is_self_recursive_Call(const ir_node *call)
{
        const ir_node *callee = get_Call_ptr(call);

        if (is_SymConst_addr_ent(callee)) {
                const ir_entity *ent = get_SymConst_entity(callee);
                const ir_graph  *irg = get_entity_irg(ent);
                if (irg == get_irn_irg(call))
                        return 1;
        }
        return 0;
}

#define BINOP(OP)                                      \
ir_node * get_##OP##_left(const ir_node *node) {       \
  assert(is_##OP(node));                               \
  return get_irn_n(node, node->op->op_index);          \
}                                                      \
void set_##OP##_left(ir_node *node, ir_node *left) {   \
  assert(is_##OP(node));                               \
  set_irn_n(node, node->op->op_index, left);           \
}                                                      \
ir_node *get_##OP##_right(const ir_node *node) {       \
  assert(is_##OP(node));                               \
  return get_irn_n(node, node->op->op_index + 1);      \
}                                                      \
void set_##OP##_right(ir_node *node, ir_node *right) { \
  assert(is_##OP(node));                               \
  set_irn_n(node, node->op->op_index + 1, right);      \
}

#define UNOP(OP)                                  \
ir_node *get_##OP##_op(const ir_node *node) {     \
  assert(is_##OP(node));                          \
  return get_irn_n(node, node->op->op_index);     \
}                                                 \
void set_##OP##_op(ir_node *node, ir_node *op) {  \
  assert(is_##OP(node));                          \
  set_irn_n(node, node->op->op_index, op);        \
}

#define BINOP_MEM(OP)                         \
BINOP(OP)                                     \
                                              \
ir_node *                                     \
get_##OP##_mem(const ir_node *node) {         \
  assert(is_##OP(node));                      \
  return get_irn_n(node, 0);                  \
}                                             \
                                              \
void                                          \
set_##OP##_mem(ir_node *node, ir_node *mem) { \
  assert(is_##OP(node));                      \
  set_irn_n(node, 0, mem);                    \
}

#define DIVOP(OP)                                       \
BINOP_MEM(OP)                                           \
                                                        \
ir_mode *get_##OP##_resmode(const ir_node *node) {      \
  assert(is_##OP(node));                                \
  return node->attr.divmod.resmode;                     \
}                                                       \
                                                        \
void set_##OP##_resmode(ir_node *node, ir_mode *mode) { \
  assert(is_##OP(node));                                \
  node->attr.divmod.resmode = mode;                     \
}


BINOP(Add)
BINOP(Borrow)
BINOP(Carry)
BINOP(Sub)
UNOP(Minus)
BINOP(Mul)
BINOP(Mulh)
DIVOP(Quot)
DIVOP(DivMod)
DIVOP(Div)
DIVOP(Mod)
UNOP(Abs)
BINOP(And)
BINOP(Or)
BINOP(Eor)
UNOP(Not)
BINOP(Shl)
BINOP(Shr)
BINOP(Shrs)
BINOP(Rotl)
BINOP(Cmp)
UNOP(Conv)
UNOP(Cast)

int get_Div_no_remainder(const ir_node *node)
{
        assert(is_Div(node));
        return node->attr.divmod.no_remainder;
}

void set_Div_no_remainder(ir_node *node, int no_remainder)
{
        assert(is_Div(node));
        node->attr.divmod.no_remainder = no_remainder;
}

int get_Conv_strict(const ir_node *node)
{
        assert(is_Conv(node));
        return node->attr.conv.strict;
}

void set_Conv_strict(ir_node *node, int strict_flag)
{
        assert(is_Conv(node));
        node->attr.conv.strict = (char)strict_flag;
}

ir_type *get_Cast_type(ir_node *node)
{
        assert(is_Cast(node));
        return node->attr.cast.type;
}

void set_Cast_type(ir_node *node, ir_type *to_tp)
{
        assert(is_Cast(node));
        node->attr.cast.type = to_tp;
}


/* Checks for upcast.
 *
 * Returns true if the Cast node casts a class type to a super type.
 */
int is_Cast_upcast(ir_node *node)
{
        ir_type *totype   = get_Cast_type(node);
        ir_type *fromtype = get_irn_typeinfo_type(get_Cast_op(node));

        assert(get_irg_typeinfo_state(get_irn_irg(node)) == ir_typeinfo_consistent);
        assert(fromtype);

        while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
                totype   = get_pointer_points_to_type(totype);
                fromtype = get_pointer_points_to_type(fromtype);
        }

        assert(fromtype);

        if (!is_Class_type(totype)) return 0;
        return is_SubClass_of(fromtype, totype);
}

/* Checks for downcast.
 *
 * Returns true if the Cast node casts a class type to a sub type.
 */
int is_Cast_downcast(ir_node *node)
{
        ir_type *totype   = get_Cast_type(node);
        ir_type *fromtype = get_irn_typeinfo_type(get_Cast_op(node));

        assert(get_irg_typeinfo_state(get_irn_irg(node)) == ir_typeinfo_consistent);
        assert(fromtype);

        while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
                totype   = get_pointer_points_to_type(totype);
                fromtype = get_pointer_points_to_type(fromtype);
        }

        assert(fromtype);

        if (!is_Class_type(totype)) return 0;
        return is_SubClass_of(totype, fromtype);
}

int (is_unop)(const ir_node *node)
{
        return _is_unop(node);
}

ir_node *get_unop_op(const ir_node *node)
{
        if (node->op->opar == oparity_unary)
                return get_irn_n(node, node->op->op_index);

        assert(node->op->opar == oparity_unary);
        return NULL;
}

void set_unop_op(ir_node *node, ir_node *op)
{
        if (node->op->opar == oparity_unary)
                set_irn_n(node, node->op->op_index, op);

        assert(node->op->opar == oparity_unary);
}

int (is_binop)(const ir_node *node)
{
        return _is_binop(node);
}

ir_node *get_binop_left(const ir_node *node)
{
        assert(node->op->opar == oparity_binary);
        return get_irn_n(node, node->op->op_index);
}

void set_binop_left(ir_node *node, ir_node *left)
{
        assert(node->op->opar == oparity_binary);
        set_irn_n(node, node->op->op_index, left);
}

ir_node *get_binop_right(const ir_node *node)
{
        assert(node->op->opar == oparity_binary);
        return get_irn_n(node, node->op->op_index + 1);
}

void set_binop_right(ir_node *node, ir_node *right)
{
        assert(node->op->opar == oparity_binary);
        set_irn_n(node, node->op->op_index + 1, right);
}

int is_Phi0(const ir_node *n)
{
        assert(n);

        return ((get_irn_op(n) == op_Phi) &&
                (get_irn_arity(n) == 0) &&
                (get_irg_phase_state(get_irn_irg(n)) ==  phase_building));
}

ir_node **get_Phi_preds_arr(ir_node *node)
{
  assert(node->op == op_Phi);
  return (ir_node **)&(get_irn_in(node)[1]);
}

int get_Phi_n_preds(const ir_node *node)
{
        assert(is_Phi(node) || is_Phi0(node));
        return (get_irn_arity(node));
}

/*
void set_Phi_n_preds(ir_node *node, int n_preds)
{
        assert(node->op == op_Phi);
}
*/

ir_node *get_Phi_pred(const ir_node *node, int pos)
{
        assert(is_Phi(node) || is_Phi0(node));
        return get_irn_n(node, pos);
}

void set_Phi_pred(ir_node *node, int pos, ir_node *pred)
{
        assert(is_Phi(node) || is_Phi0(node));
        set_irn_n(node, pos, pred);
}

ir_node *(get_Phi_next)(const ir_node *phi)
{
        return _get_Phi_next(phi);
}

void (set_Phi_next)(ir_node *phi, ir_node *next)
{
        _set_Phi_next(phi, next);
}

int is_memop(const ir_node *node)
{
        ir_opcode code = get_irn_opcode(node);
        return (code == iro_Load || code == iro_Store);
}

ir_node *get_memop_mem(const ir_node *node)
{
        assert(is_memop(node));
        return get_irn_n(node, 0);
}

void set_memop_mem(ir_node *node, ir_node *mem)
{
        assert(is_memop(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_memop_ptr(const ir_node *node)
{
        assert(is_memop(node));
        return get_irn_n(node, 1);
}

void set_memop_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_memop(node));
        set_irn_n(node, 1, ptr);
}

ir_node *get_Load_mem(const ir_node *node)
{
        assert(is_Load(node));
        return get_irn_n(node, 0);
}

void set_Load_mem(ir_node *node, ir_node *mem)
{
        assert(is_Load(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Load_ptr(const ir_node *node)
{
        assert(is_Load(node));
        return get_irn_n(node, 1);
}

void set_Load_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_Load(node));
        set_irn_n(node, 1, ptr);
}

ir_mode *get_Load_mode(const ir_node *node)
{
        assert(is_Load(node));
        return node->attr.load.mode;
}

void set_Load_mode(ir_node *node, ir_mode *mode)
{
        assert(is_Load(node));
        node->attr.load.mode = mode;
}

ir_volatility get_Load_volatility(const ir_node *node)
{
        assert(is_Load(node));
        return node->attr.load.volatility;
}

void set_Load_volatility(ir_node *node, ir_volatility volatility)
{
        assert(is_Load(node));
        node->attr.load.volatility = volatility;
}

ir_align get_Load_align(const ir_node *node)
{
        assert(is_Load(node));
        return node->attr.load.aligned;
}

void set_Load_align(ir_node *node, ir_align align)
{
        assert(is_Load(node));
        node->attr.load.aligned = align;
}


ir_node *get_Store_mem(const ir_node *node)
{
        assert(is_Store(node));
        return get_irn_n(node, 0);
}

void set_Store_mem(ir_node *node, ir_node *mem)
{
        assert(is_Store(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Store_ptr(const ir_node *node)
{
        assert(is_Store(node));
        return get_irn_n(node, 1);
}

void set_Store_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_Store(node));
        set_irn_n(node, 1, ptr);
}

ir_node *get_Store_value(const ir_node *node)
{
        assert(is_Store(node));
        return get_irn_n(node, 2);
}

void set_Store_value(ir_node *node, ir_node *value)
{
        assert(is_Store(node));
        set_irn_n(node, 2, value);
}

ir_volatility get_Store_volatility(const ir_node *node)
{
        assert(is_Store(node));
        return node->attr.store.volatility;
}

void set_Store_volatility(ir_node *node, ir_volatility volatility)
{
        assert(is_Store(node));
        node->attr.store.volatility = volatility;
}

ir_align get_Store_align(const ir_node *node)
{
        assert(is_Store(node));
        return node->attr.store.aligned;
}

void set_Store_align(ir_node *node, ir_align align)
{
        assert(is_Store(node));
        node->attr.store.aligned = align;
}


ir_node *get_Alloc_mem(const ir_node *node)
{
        assert(is_Alloc(node));
        return get_irn_n(node, 0);
}

void set_Alloc_mem(ir_node *node, ir_node *mem)
{
        assert(is_Alloc(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Alloc_count(const ir_node *node)
{
        assert(is_Alloc(node));
        return get_irn_n(node, 1);
}

void set_Alloc_count(ir_node *node, ir_node *count)
{
        assert(is_Alloc(node));
        set_irn_n(node, 1, count);
}

ir_type *get_Alloc_type(ir_node *node)
{
        assert(is_Alloc(node));
        return node->attr.alloc.type;
}

void set_Alloc_type(ir_node *node, ir_type *tp)
{
        assert(is_Alloc(node));
        node->attr.alloc.type = tp;
}

ir_where_alloc get_Alloc_where(const ir_node *node)
{
        assert(is_Alloc(node));
        return node->attr.alloc.where;
}

void set_Alloc_where(ir_node *node, ir_where_alloc where)
{
        assert(is_Alloc(node));
        node->attr.alloc.where = where;
}


ir_node *get_Free_mem(const ir_node *node)
{
        assert(is_Free(node));
        return get_irn_n(node, 0);
}

void set_Free_mem(ir_node *node, ir_node *mem)
{
        assert(is_Free(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Free_ptr(const ir_node *node)
{
        assert(is_Free(node));
        return get_irn_n(node, 1);
}

void set_Free_ptr(ir_node *node, ir_node *ptr)
{
        assert(is_Free(node));
        set_irn_n(node, 1, ptr);
}

ir_node *get_Free_size(const ir_node *node)
{
        assert(is_Free(node));
        return get_irn_n(node, 2);
}

void set_Free_size(ir_node *node, ir_node *size)
{
        assert(is_Free(node));
        set_irn_n(node, 2, size);
}

ir_type *get_Free_type(ir_node *node)
{
        assert(is_Free(node));
        return node->attr.free.type;
}

void set_Free_type(ir_node *node, ir_type *tp)
{
        assert(is_Free(node));
        node->attr.free.type = tp;
}

ir_where_alloc get_Free_where(const ir_node *node)
{
        assert(is_Free(node));
        return node->attr.free.where;
}

void set_Free_where(ir_node *node, ir_where_alloc where)
{
        assert(is_Free(node));
        node->attr.free.where = where;
}

ir_node **get_Sync_preds_arr(ir_node *node)
{
        assert(is_Sync(node));
        return (ir_node **)&(get_irn_in(node)[1]);
}

int get_Sync_n_preds(const ir_node *node)
{
        assert(is_Sync(node));
        return (get_irn_arity(node));
}

/*
void set_Sync_n_preds(ir_node *node, int n_preds)
{
        assert(is_Sync(node));
}
*/

ir_node *get_Sync_pred(const ir_node *node, int pos)
{
        assert(is_Sync(node));
        return get_irn_n(node, pos);
}

void set_Sync_pred(ir_node *node, int pos, ir_node *pred)
{
        assert(is_Sync(node));
        set_irn_n(node, pos, pred);
}

/* Add a new Sync predecessor */
void add_Sync_pred(ir_node *node, ir_node *pred)
{
        assert(is_Sync(node));
        add_irn_n(node, pred);
}

/* Returns the source language type of a Proj node. */
ir_type *get_Proj_type(ir_node *n)
{
        ir_type *tp   = firm_unknown_type;
        ir_node *pred = get_Proj_pred(n);

        switch (get_irn_opcode(pred)) {
        case iro_Proj: {
                ir_node *pred_pred;
                /* Deal with Start / Call here: we need to know the Proj Nr. */
                assert(get_irn_mode(pred) == mode_T);
                pred_pred = get_Proj_pred(pred);

                if (is_Start(pred_pred))  {
                        ir_type *mtp = get_entity_type(get_irg_entity(get_irn_irg(pred_pred)));
                        tp = get_method_param_type(mtp, get_Proj_proj(n));
                } else if (is_Call(pred_pred)) {
                        ir_type *mtp = get_Call_type(pred_pred);
                        tp = get_method_res_type(mtp, get_Proj_proj(n));
                }
        } break;
        case iro_Start: break;
        case iro_Call: break;
        case iro_Load: {
                ir_node *a = get_Load_ptr(pred);
                if (is_Sel(a))
                        tp = get_entity_type(get_Sel_entity(a));
        } break;
        default:
                break;
        }
        return tp;
}

ir_node *get_Proj_pred(const ir_node *node)
{
        assert(is_Proj(node));
        return get_irn_n(node, 0);
}

void set_Proj_pred(ir_node *node, ir_node *pred)
{
        assert(is_Proj(node));
        set_irn_n(node, 0, pred);
}

long get_Proj_proj(const ir_node *node)
{
#ifdef INTERPROCEDURAL_VIEW
        ir_opcode code = get_irn_opcode(node);

        if (code == iro_Proj) {
                return node->attr.proj;
        }
        else {
                assert(code == iro_Filter);
                return node->attr.filter.proj;
        }
#else
        assert(is_Proj(node));
        return node->attr.proj;
#endif /* INTERPROCEDURAL_VIEW */
}

void set_Proj_proj(ir_node *node, long proj)
{
#ifdef INTERPROCEDURAL_VIEW
        ir_opcode code = get_irn_opcode(node);

        if (code == iro_Proj) {
                node->attr.proj = proj;
        }
        else {
                assert(code == iro_Filter);
                node->attr.filter.proj = proj;
        }
#else
        assert(is_Proj(node));
        node->attr.proj = proj;
#endif /* INTERPROCEDURAL_VIEW */
}

/* Returns non-zero if a node is a routine parameter. */
int (is_arg_Proj)(const ir_node *node)
{
        return _is_arg_Proj(node);
}

ir_node **get_Tuple_preds_arr(ir_node *node)
{
        assert(is_Tuple(node));
        return (ir_node **)&(get_irn_in(node)[1]);
}

int get_Tuple_n_preds(const ir_node *node)
{
        assert(is_Tuple(node));
        return get_irn_arity(node);
}

/*
void set_Tuple_n_preds(ir_node *node, int n_preds)
{
        assert(is_Tuple(node));
}
*/

ir_node *get_Tuple_pred(const ir_node *node, int pos)
{
  assert(is_Tuple(node));
  return get_irn_n(node, pos);
}

void set_Tuple_pred(ir_node *node, int pos, ir_node *pred)
{
        assert(is_Tuple(node));
        set_irn_n(node, pos, pred);
}

ir_node *get_Id_pred(const ir_node *node)
{
        assert(is_Id(node));
        return get_irn_n(node, 0);
}

void set_Id_pred(ir_node *node, ir_node *pred)
{
        assert(is_Id(node));
        set_irn_n(node, 0, pred);
}

ir_node *get_Confirm_value(const ir_node *node)
{
        assert(is_Confirm(node));
        return get_irn_n(node, 0);
}

void set_Confirm_value(ir_node *node, ir_node *value)
{
        assert(is_Confirm(node));
        set_irn_n(node, 0, value);
}

ir_node *get_Confirm_bound(const ir_node *node)
{
        assert(is_Confirm(node));
        return get_irn_n(node, 1);
}

void set_Confirm_bound(ir_node *node, ir_node *bound)
{
        assert(is_Confirm(node));
        set_irn_n(node, 0, bound);
}

pn_Cmp get_Confirm_cmp(const ir_node *node)
{
        assert(is_Confirm(node));
        return node->attr.confirm.cmp;
}

void set_Confirm_cmp(ir_node *node, pn_Cmp cmp)
{
        assert(is_Confirm(node));
        node->attr.confirm.cmp = cmp;
}

ir_node *get_Filter_pred(ir_node *node)
{
        assert(is_Filter(node));
        return node->in[1];
}

void set_Filter_pred(ir_node *node, ir_node *pred)
{
        assert(is_Filter(node));
        node->in[1] = pred;
}

long get_Filter_proj(ir_node *node)
{
        assert(is_Filter(node));
        return node->attr.filter.proj;
}

void set_Filter_proj(ir_node *node, long proj)
{
        assert(is_Filter(node));
        node->attr.filter.proj = proj;
}

/* Don't use get_irn_arity, get_irn_n in implementation as access
   shall work independent of view!!! */
void set_Filter_cg_pred_arr(ir_node *node, int arity, ir_node ** in)
{
        assert(is_Filter(node));
        if (node->attr.filter.in_cg == NULL || arity != ARR_LEN(node->attr.filter.in_cg) - 1) {
                ir_graph *irg = get_irn_irg(node);
                node->attr.filter.in_cg = NEW_ARR_D(ir_node *, current_ir_graph->obst, arity + 1);
                node->attr.filter.backedge = new_backedge_arr(irg->obst, arity);
                node->attr.filter.in_cg[0] = node->in[0];
        }
        memcpy(node->attr.filter.in_cg + 1, in, sizeof(ir_node *) * arity);
}

void set_Filter_cg_pred(ir_node * node, int pos, ir_node * pred)
{
        assert(is_Filter(node) && node->attr.filter.in_cg &&
               0 <= pos && pos < ARR_LEN(node->attr.filter.in_cg) - 1);
        node->attr.filter.in_cg[pos + 1] = pred;
}

int get_Filter_n_cg_preds(ir_node *node)
{
        assert(is_Filter(node) && node->attr.filter.in_cg);
        return (ARR_LEN(node->attr.filter.in_cg) - 1);
}

ir_node *get_Filter_cg_pred(ir_node *node, int pos)
{
        int arity;
        assert(is_Filter(node) && node->attr.filter.in_cg &&
               0 <= pos);
        arity = ARR_LEN(node->attr.filter.in_cg);
        assert(pos < arity - 1);
        return node->attr.filter.in_cg[pos + 1];
}

/* Mux support */
ir_node *get_Mux_sel(const ir_node *node)
{
        assert(is_Mux(node));
        return node->in[1];
}

void set_Mux_sel(ir_node *node, ir_node *sel)
{
        assert(is_Mux(node));
        node->in[1] = sel;
}

ir_node *get_Mux_false(const ir_node *node)
{
        assert(is_Mux(node));
        return node->in[2];
}

void set_Mux_false(ir_node *node, ir_node *ir_false)
{
        assert(is_Mux(node));
        node->in[2] = ir_false;
}

ir_node *get_Mux_true(const ir_node *node)
{
        assert(is_Mux(node));
        return node->in[3];
}

void set_Mux_true(ir_node *node, ir_node *ir_true)
{
        assert(is_Mux(node));
        node->in[3] = ir_true;
}

/* CopyB support */
ir_node *get_CopyB_mem(const ir_node *node)
{
        assert(is_CopyB(node));
        return get_irn_n(node, 0);
}

void set_CopyB_mem(ir_node *node, ir_node *mem)
{
        assert(node->op == op_CopyB);
        set_irn_n(node, 0, mem);
}

ir_node *get_CopyB_dst(const ir_node *node)
{
        assert(is_CopyB(node));
        return get_irn_n(node, 1);
}

void set_CopyB_dst(ir_node *node, ir_node *dst)
{
        assert(is_CopyB(node));
        set_irn_n(node, 1, dst);
}

ir_node *get_CopyB_src(const ir_node *node)
{
  assert(is_CopyB(node));
  return get_irn_n(node, 2);
}

void set_CopyB_src(ir_node *node, ir_node *src)
{
        assert(is_CopyB(node));
        set_irn_n(node, 2, src);
}

ir_type *get_CopyB_type(ir_node *node)
{
        assert(is_CopyB(node));
        return node->attr.copyb.type;
}

void set_CopyB_type(ir_node *node, ir_type *data_type)
{
        assert(is_CopyB(node) && data_type);
        node->attr.copyb.type = data_type;
}


ir_type *get_InstOf_type(ir_node *node)
{
        assert(node->op == op_InstOf);
        return node->attr.instof.type;
}

void set_InstOf_type(ir_node *node, ir_type *type)
{
        assert(node->op == op_InstOf);
        node->attr.instof.type = type;
}

ir_node *get_InstOf_store(const ir_node *node)
{
        assert(node->op == op_InstOf);
        return get_irn_n(node, 0);
}

void set_InstOf_store(ir_node *node, ir_node *obj)
{
        assert(node->op == op_InstOf);
        set_irn_n(node, 0, obj);
}

ir_node *get_InstOf_obj(const ir_node *node)
{
        assert(node->op == op_InstOf);
        return get_irn_n(node, 1);
}

void set_InstOf_obj(ir_node *node, ir_node *obj)
{
        assert(node->op == op_InstOf);
        set_irn_n(node, 1, obj);
}

/* Returns the memory input of a Raise operation. */
ir_node *get_Raise_mem(const ir_node *node)
{
        assert(is_Raise(node));
        return get_irn_n(node, 0);
}

void set_Raise_mem(ir_node *node, ir_node *mem)
{
        assert(is_Raise(node));
        set_irn_n(node, 0, mem);
}

ir_node *get_Raise_exo_ptr(const ir_node *node)
{
        assert(is_Raise(node));
        return get_irn_n(node, 1);
}

void set_Raise_exo_ptr(ir_node *node, ir_node *exo_ptr)
{
        assert(is_Raise(node));
        set_irn_n(node, 1, exo_ptr);
}

/* Bound support */

/* Returns the memory input of a Bound operation. */
ir_node *get_Bound_mem(const ir_node *bound)
{
        assert(is_Bound(bound));
        return get_irn_n(bound, 0);
}

void set_Bound_mem(ir_node *bound, ir_node *mem)
{
        assert(is_Bound(bound));
        set_irn_n(bound, 0, mem);
}

/* Returns the index input of a Bound operation. */
ir_node *get_Bound_index(const ir_node *bound)
{
        assert(is_Bound(bound));
        return get_irn_n(bound, 1);
}

void set_Bound_index(ir_node *bound, ir_node *idx)
{
        assert(is_Bound(bound));
        set_irn_n(bound, 1, idx);
}

/* Returns the lower bound input of a Bound operation. */
ir_node *get_Bound_lower(const ir_node *bound)
{
        assert(is_Bound(bound));
        return get_irn_n(bound, 2);
}

void set_Bound_lower(ir_node *bound, ir_node *lower)
{
        assert(is_Bound(bound));
        set_irn_n(bound, 2, lower);
}

/* Returns the upper bound input of a Bound operation. */
ir_node *get_Bound_upper(const ir_node *bound)
{
        assert(is_Bound(bound));
        return get_irn_n(bound, 3);
}

void set_Bound_upper(ir_node *bound, ir_node *upper)
{
        assert(is_Bound(bound));
        set_irn_n(bound, 3, upper);
}

/* Return the operand of a Pin node. */
ir_node *get_Pin_op(const ir_node *pin)
{
        assert(is_Pin(pin));
        return get_irn_n(pin, 0);
}

void set_Pin_op(ir_node *pin, ir_node *node)
{
        assert(is_Pin(pin));
        set_irn_n(pin, 0, node);
}

/* Return the assembler text of an ASM pseudo node. */
ident *get_ASM_text(const ir_node *node)
{
        assert(is_ASM(node));
        return node->attr.assem.asm_text;
}

/* Return the number of input constraints for an ASM node. */
int get_ASM_n_input_constraints(const ir_node *node)
{
        assert(is_ASM(node));
        return ARR_LEN(node->attr.assem.inputs);
}

/* Return the input constraints for an ASM node. This is a flexible array. */
const ir_asm_constraint *get_ASM_input_constraints(const ir_node *node)
{
        assert(is_ASM(node));
        return node->attr.assem.inputs;
}

/* Return the number of output constraints for an ASM node.  */
int get_ASM_n_output_constraints(const ir_node *node)
{
        assert(is_ASM(node));
        return ARR_LEN(node->attr.assem.outputs);
}

/* Return the output constraints for an ASM node. */
const ir_asm_constraint *get_ASM_output_constraints(const ir_node *node)
{
        assert(is_ASM(node));
        return node->attr.assem.outputs;
}

/* Return the number of clobbered registers for an ASM node.  */
int get_ASM_n_clobbers(const ir_node *node)
{
        assert(is_ASM(node));
        return ARR_LEN(node->attr.assem.clobber);
}

/* Return the list of clobbered registers for an ASM node. */
ident **get_ASM_clobbers(const ir_node *node)
{
        assert(is_ASM(node));
        return node->attr.assem.clobber;
}

/* returns the graph of a node */
ir_graph *(get_irn_irg)(const ir_node *node)
{
        return _get_irn_irg(node);
}


/*----------------------------------------------------------------*/
/*  Auxiliary routines                                            */
/*----------------------------------------------------------------*/

ir_node *skip_Proj(ir_node *node)
{
        /* don't assert node !!! */
        if (node == NULL)
                return NULL;

        if (is_Proj(node))
                node = get_Proj_pred(node);

        return node;
}

const ir_node *
skip_Proj_const(const ir_node *node)
{
        /* don't assert node !!! */
        if (node == NULL)
                return NULL;

        if (is_Proj(node))
                node = get_Proj_pred(node);

        return node;
}

ir_node *skip_Tuple(ir_node *node)
{
  ir_node *pred;
  ir_op   *op;

restart:
        if (is_Proj(node)) {
            pred = get_Proj_pred(node);
            op   = get_irn_op(pred);

                /*
                 * Looks strange but calls get_irn_op() only once
                 * in most often cases.
                 */
                if (op == op_Proj) { /* nested Tuple ? */
                    pred = skip_Tuple(pred);

                        if (is_Tuple(pred)) {
                                node = get_Tuple_pred(pred, get_Proj_proj(node));
                                goto restart;
                        }
                } else if (op == op_Tuple) {
                        node = get_Tuple_pred(pred, get_Proj_proj(node));
                        goto restart;
                }
        }
        return node;
}

/* returns operand of node if node is a Cast */
ir_node *skip_Cast(ir_node *node)
{
        if (is_Cast(node))
                return get_Cast_op(node);
        return node;
}

/* returns operand of node if node is a Cast */
const ir_node *skip_Cast_const(const ir_node *node)
{
        if (is_Cast(node))
                return get_Cast_op(node);
        return node;
}

/* returns operand of node if node is a Pin */
ir_node *skip_Pin(ir_node *node)
{
        if (is_Pin(node))
                return get_Pin_op(node);
        return node;
}

/* returns operand of node if node is a Confirm */
ir_node *skip_Confirm(ir_node *node)
{
        if (is_Confirm(node))
                return get_Confirm_value(node);
        return node;
}

/* skip all high-level ops */
ir_node *skip_HighLevel_ops(ir_node *node)
{
        while (is_op_highlevel(get_irn_op(node))) {
                node = get_irn_n(node, 0);
        }
        return node;
}


/* This should compact Id-cycles to self-cycles. It has the same (or less?) complexity
 * than any other approach, as Id chains are resolved and all point to the real node, or
 * all id's are self loops.
 *
 * Note: This function takes 10% of mostly ANY the compiler run, so it's
 * a little bit "hand optimized".
 *
 * Moreover, it CANNOT be switched off using get_opt_normalize() ...
 */
ir_node *skip_Id(ir_node *node)
{
        ir_node *pred;
        /* don't assert node !!! */

        if (!node || (node->op != op_Id)) return node;

        /* Don't use get_Id_pred():  We get into an endless loop for
           self-referencing Ids. */
        pred = node->in[0+1];

        if (pred->op != op_Id) return pred;

        if (node != pred) {  /* not a self referencing Id. Resolve Id chain. */
                ir_node *rem_pred, *res;

                if (pred->op != op_Id) return pred; /* shortcut */
                rem_pred = pred;

                assert(get_irn_arity (node) > 0);

                node->in[0+1] = node;   /* turn us into a self referencing Id:  shorten Id cycles. */
                res = skip_Id(rem_pred);
                if (res->op == op_Id) /* self-loop */ return node;

                node->in[0+1] = res;    /* Turn Id chain into Ids all referencing the chain end. */
                return res;
        } else {
                return node;
        }
}

int (is_strictConv)(const ir_node *node)
{
        return _is_strictConv(node);
}

int (is_no_Block)(const ir_node *node)
{
        return _is_no_Block(node);
}

/* Returns true if node is a SymConst node with kind symconst_addr_ent. */
int (is_SymConst_addr_ent)(const ir_node *node)
{
        return _is_SymConst_addr_ent(node);
}

/* Returns true if the operation manipulates control flow. */
int is_cfop(const ir_node *node)
{
        return is_op_cfopcode(get_irn_op(node));
}

/* Returns true if the operation manipulates interprocedural control flow:
   CallBegin, EndReg, EndExcept */
int is_ip_cfop(const ir_node *node)
{
        return is_ip_cfopcode(get_irn_op(node));
}

/* Returns true if the operation can change the control flow because
   of an exception. */
int is_fragile_op(const ir_node *node)
{
        return is_op_fragile(get_irn_op(node));
}

/* Returns the memory operand of fragile operations. */
ir_node *get_fragile_op_mem(ir_node *node)
{
        assert(node && is_fragile_op(node));

        switch (get_irn_opcode(node)) {
        case iro_Call  :
        case iro_Quot  :
        case iro_DivMod:
        case iro_Div   :
        case iro_Mod   :
        case iro_Load  :
        case iro_Store :
        case iro_Alloc :
        case iro_Bound :
        case iro_CopyB :
                return get_irn_n(node, pn_Generic_M);
        case iro_Bad   :
        case iro_Unknown:
                return node;
        default:
                panic("should not be reached");
        }
}

/* Returns the result mode of a Div operation. */
ir_mode *get_divop_resmod(const ir_node *node)
{
        switch (get_irn_opcode(node)) {
        case iro_Quot  : return get_Quot_resmode(node);
        case iro_DivMod: return get_DivMod_resmode(node);
        case iro_Div   : return get_Div_resmode(node);
        case iro_Mod   : return get_Mod_resmode(node);
        default:
                panic("should not be reached");
        }
}

/* Returns true if the operation is a forking control flow operation. */
int (is_irn_forking)(const ir_node *node)
{
        return _is_irn_forking(node);
}

void (copy_node_attr)(ir_graph *irg, const ir_node *old_node, ir_node *new_node)
{
        _copy_node_attr(irg, old_node, new_node);
}

/* Return the type associated with the value produced by n
 * if the node remarks this type as it is the case for
 * Cast, Const, SymConst and some Proj nodes. */
ir_type *(get_irn_type)(ir_node *node)
{
        return _get_irn_type(node);
}

/* Return the type attribute of a node n (SymConst, Call, Alloc, Free,
   Cast) or NULL.*/
ir_type *(get_irn_type_attr)(ir_node *node)
{
        return _get_irn_type_attr(node);
}

/* Return the entity attribute of a node n (SymConst, Sel) or NULL. */
ir_entity *(get_irn_entity_attr)(ir_node *node)
{
        return _get_irn_entity_attr(node);
}

/* Returns non-zero for constant-like nodes. */
int (is_irn_constlike)(const ir_node *node)
{
        return _is_irn_constlike(node);
}

/*
 * Returns non-zero for nodes that are allowed to have keep-alives and
 * are neither Block nor PhiM.
 */
int (is_irn_keep)(const ir_node *node)
{
        return _is_irn_keep(node);
}

/*
 * Returns non-zero for nodes that are always placed in the start block.
 */
int (is_irn_start_block_placed)(const ir_node *node)
{
        return _is_irn_start_block_placed(node);
}

/* Returns non-zero for nodes that are machine operations. */
int (is_irn_machine_op)(const ir_node *node)
{
        return _is_irn_machine_op(node);
}

/* Returns non-zero for nodes that are machine operands. */
int (is_irn_machine_operand)(const ir_node *node)
{
        return _is_irn_machine_operand(node);
}

/* Returns non-zero for nodes that have the n'th user machine flag set. */
int (is_irn_machine_user)(const ir_node *node, unsigned n)
{
        return _is_irn_machine_user(node, n);
}

/* Returns non-zero for nodes that are CSE neutral to its users. */
int (is_irn_cse_neutral)(const ir_node *node)
{
        return _is_irn_cse_neutral(node);
}

/* Gets the string representation of the jump prediction .*/
const char *get_cond_jmp_predicate_name(cond_jmp_predicate pred)
{
#define X(a)    case a: return #a
        switch (pred) {
                X(COND_JMP_PRED_NONE);
                X(COND_JMP_PRED_TRUE);
                X(COND_JMP_PRED_FALSE);
        }
        return "<unknown>";
#undef X
}

/* Returns the conditional jump prediction of a Cond node. */
cond_jmp_predicate (get_Cond_jmp_pred)(const ir_node *cond)
{
        return _get_Cond_jmp_pred(cond);
}

/* Sets a new conditional jump prediction. */
void (set_Cond_jmp_pred)(ir_node *cond, cond_jmp_predicate pred)
{
        _set_Cond_jmp_pred(cond, pred);
}

/** the get_type operation must be always implemented and return a firm type */
static ir_type *get_Default_type(ir_node *n)
{
        (void) n;
        return get_unknown_type();
}

/* Sets the get_type operation for an ir_op_ops. */
ir_op_ops *firm_set_default_get_type(ir_opcode code, ir_op_ops *ops)
{
        switch (code) {
        case iro_Const:    ops->get_type = get_Const_type; break;
        case iro_SymConst: ops->get_type = get_SymConst_value_type; break;
        case iro_Cast:     ops->get_type = get_Cast_type; break;
        case iro_Proj:     ops->get_type = get_Proj_type; break;
        default:
                /* not allowed to be NULL */
                if (! ops->get_type)
                        ops->get_type = get_Default_type;
                break;
        }
        return ops;
}

/** Return the attribute type of a SymConst node if exists */
static ir_type *get_SymConst_attr_type(ir_node *self)
{
        symconst_kind kind = get_SymConst_kind(self);
        if (SYMCONST_HAS_TYPE(kind))
                return get_SymConst_type(self);
        return NULL;
}

/** Return the attribute entity of a SymConst node if exists */
static ir_entity *get_SymConst_attr_entity(ir_node *self)
{
        symconst_kind kind = get_SymConst_kind(self);
        if (SYMCONST_HAS_ENT(kind))
                return get_SymConst_entity(self);
        return NULL;
}

/** the get_type_attr operation must be always implemented */
static ir_type *get_Null_type(ir_node *n)
{
        (void) n;
        return firm_unknown_type;
}

/* Sets the get_type operation for an ir_op_ops. */
ir_op_ops *firm_set_default_get_type_attr(ir_opcode code, ir_op_ops *ops)
{
        switch (code) {
        case iro_SymConst: ops->get_type_attr = get_SymConst_attr_type; break;
        case iro_Call:     ops->get_type_attr = get_Call_type; break;
        case iro_Alloc:    ops->get_type_attr = get_Alloc_type; break;
        case iro_Free:     ops->get_type_attr = get_Free_type; break;
        case iro_Cast:     ops->get_type_attr = get_Cast_type; break;
        default:
                /* not allowed to be NULL */
                if (! ops->get_type_attr)
                        ops->get_type_attr = get_Null_type;
                break;
        }
        return ops;
}

/** the get_entity_attr operation must be always implemented */
static ir_entity *get_Null_ent(ir_node *n)
{
        (void) n;
        return NULL;
}

/* Sets the get_type operation for an ir_op_ops. */
ir_op_ops *firm_set_default_get_entity_attr(ir_opcode code, ir_op_ops *ops)
{
        switch (code) {
        case iro_SymConst: ops->get_entity_attr = get_SymConst_attr_entity; break;
        case iro_Sel:      ops->get_entity_attr = _get_Sel_entity; break;
        default:
                /* not allowed to be NULL */
                if (! ops->get_entity_attr)
                        ops->get_entity_attr = get_Null_ent;
                break;
        }
        return ops;
}

/* Sets the debug information of a node. */
void (set_irn_dbg_info)(ir_node *n, dbg_info *db)
{
        _set_irn_dbg_info(n, db);
}

/**
 * Returns the debug information of an node.
 *
 * @param n   The node.
 */
dbg_info *(get_irn_dbg_info)(const ir_node *n)
{
        return _get_irn_dbg_info(n);
}

/* checks whether a node represents a global address */
int is_Global(const ir_node *node)
{
        return is_SymConst_addr_ent(node);
}

/* returns the entity of a global address */
ir_entity *get_Global_entity(const ir_node *node)
{
        return get_SymConst_entity(node);
}

/*
 * Calculate a hash value of a node.
 */
unsigned firm_default_hash(const ir_node *node)
{
        unsigned h;
        int i, irn_arity;

        /* hash table value = 9*(9*(9*(9*(9*arity+in[0])+in[1])+ ...)+mode)+code */
        h = irn_arity = get_irn_intra_arity(node);

        /* consider all in nodes... except the block if not a control flow. */
        for (i = is_cfop(node) ? -1 : 0;  i < irn_arity;  ++i) {
                ir_node *pred = get_irn_intra_n(node, i);
                if (is_irn_cse_neutral(pred))
                        h *= 9;
                else
                        h = 9*h + HASH_PTR(pred);
        }

        /* ...mode,... */
        h = 9*h + HASH_PTR(get_irn_mode(node));
        /* ...and code */
        h = 9*h + HASH_PTR(get_irn_op(node));

        return h;
}  /* firm_default_hash */

/* include generated code */
#include "gen_irnode.c.inl"