[libfirm] / ir / ir / irnode.c

/*
 * Project:     libFIRM
 * File name:   ir/ir/irnode.c
 * Purpose:     Representation of an intermediate operation.
 * Author:      Martin Trapp, Christian Schaefer
 * Modified by: Goetz Lindenmaier
 * Created:
 * CVS-ID:      $Id$
 * Copyright:   (c) 1998-2003 Universität Karlsruhe
 * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>

#include "ident.h"
#include "irnode_t.h"
#include "irgraph_t.h"
#include "irmode_t.h"
#include "typegmod.h"
#include "irbackedge_t.h"
#include "irdump.h"
#include "irop_t.h"
#include "irprog_t.h"

#include "firmstat.h"

/* some constants fixing the positions of nodes predecessors
   in the in array */
#define CALL_PARAM_OFFSET 2
#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 [] = {
  "False", "Eq", "Lt", "Le",
  "Gt", "Ge", "Lg", "Leg", "Uo",
  "Ue", "Ul", "Ule", "Ug", "Uge",
  "Ne", "True"
};

/**
 * returns the pnc name from an pnc constant
 */
const char *get_pnc_string(int pnc) {
  return pnc_name_arr[pnc];
}

/**
 * Calculates the negated pnc condition.
 */
int
get_negated_pnc(int pnc) {
  switch (pnc) {
  case False: return True;  break;
  case Eq:    return Ne;    break;
  case Lt:    return Uge;   break;
  case Le:    return Ug;    break;
  case Gt:    return Ule;   break;
  case Ge:    return Ul;    break;
  case Lg:    return Ue;    break;
  case Leg:   return Uo;    break;
  case Uo:    return Leg;   break;
  case Ue:    return Lg;    break;
  case Ul:    return Ge;    break;
  case Ule:   return Gt;    break;
  case Ug:    return Le;    break;
  case Uge:   return Lt;    break;
  case Ne:    return Eq;    break;
  case True:  return False; break;
  }
  return 99; /* to shut up gcc */
}

const char *pns_name_arr [] = {
  "initial_exec", "global_store",
  "frame_base", "globals", "args"
};

const char *symconst_name_arr [] = {
  "type_tag", "size", "linkage_ptr_info"
};

void
init_irnode (void)
{
}

/*
 * 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;
  int node_size = offsetof (ir_node, attr) +  op->attr_size;

  assert(irg && op && mode);
  res = (ir_node *) obstack_alloc (irg->obst, node_size);
  memset((void *)res, 0, node_size);

  res->kind = k_ir_node;
  res->op = op;
  res->mode = mode;
  res->visited = 0;
  res->link = NULL;
  if (arity < 0) {
    res->in = NEW_ARR_F (ir_node *, 1);  /* 1: space for block */
  } 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;

#ifdef DEBUG_libfirm
  res->node_nr = get_irp_new_node_nr();
#endif

  stat_new_node(res);

  return res;
}

/* Copies all attributes stored in the old node to the new node.
   Assumes both have the same opcode and sufficient size. */
void
copy_attrs (const ir_node *old_node, ir_node *new_node) {
  assert(get_irn_op(old_node) == get_irn_op(new_node));
  memcpy(&new_node->attr, &old_node->attr, get_op_attr_size(get_irn_op(old_node)));
}

/*-- 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) {
  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);
  if (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 */
  }
  return node->in;
}

void
set_irn_in (ir_node *node, int arity, ir_node **in) {
  ir_node *** arr;
  assert(node);
  if (interprocedural_view) { /* handle Filter and Block specially */
    if (get_irn_opcode(node) == iro_Filter) {
      assert(node->attr.filter.in_cg);
      arr = &node->attr.filter.in_cg;
    } else if (get_irn_opcode(node) == iro_Block && node->attr.block.in_cg) {
      arr = &node->attr.block.in_cg;
    } else {
      arr = &node->in;
    }
  } else {
    arr = &node->in;
  }
  if (arity != ARR_LEN(*arr) - 1) {
    ir_node * block = (*arr)[0];
    *arr = NEW_ARR_D(ir_node *, current_ir_graph->obst, arity + 1);
    (*arr)[0] = block;
  }
  fix_backedges(current_ir_graph->obst, node);
  memcpy((*arr) + 1, in, sizeof(ir_node *) * arity);
}

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

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

ir_node *
(get_irn_n)(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 && -1 <= n && n < get_irn_arity(node));
  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 (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 */
  }
  node->in[n + 1] = in;
}

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);
}

modecode
get_irn_modecode (const ir_node *node)
{
  assert (node);
  return node->mode->code;
}

/** 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)
{
  assert (node);
  node->op = op;
}

opcode
(get_irn_opcode)(const ir_node *node)
{
  return __get_irn_opcode(node);
}

const char *
get_irn_opname (const ir_node *node)
{
  assert(node);
  if ((get_irn_op((ir_node *)node) == op_Phi) &&
      (get_irg_phase_state(get_irn_irg((ir_node *)node)) == phase_building) &&
      (get_irn_arity((ir_node *)node) == 0)) return "Phi0";
  return get_id_str(node->op->name);
}

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

unsigned long
(get_irn_visited)(const ir_node *node)
{
  return __get_irn_visited(node);
}

void
(set_irn_visited)(ir_node *node, unsigned long visited)
{
  __set_irn_visited(node, visited);
}

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

int
(irn_not_visited)(const ir_node *node) {
  return __irn_not_visited(node);
}

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

/* Outputs a unique number for this node */
long
get_irn_node_nr(const ir_node *node) {
  assert(node);
#ifdef DEBUG_libfirm
  return node->node_nr;
#else
  return (long)&node;
#endif
}

const_attr
get_irn_const_attr (ir_node *node)
{
  assert (node->op == op_Const);
  return node->attr.con;
}

long
get_irn_proj_attr (ir_node *node)
{
  assert (node->op == op_Proj);
  return node->attr.proj;
}

alloc_attr
get_irn_alloc_attr (ir_node *node)
{
  assert (node->op == op_Alloc);
  return node->attr.a;
}

type *
get_irn_free_attr     (ir_node *node)
{
  assert (node->op == op_Free);
  return node->attr.f = skip_tid(node->attr.f);
}

symconst_attr
get_irn_symconst_attr (ir_node *node)
{
  assert (node->op == op_SymConst);
  return node->attr.i;
}

type *
get_irn_call_attr (ir_node *node)
{
  assert (node->op == op_Call);
  return node->attr.call.cld_tp = skip_tid(node->attr.call.cld_tp);
}

type *
get_irn_funccall_attr (ir_node *node)
{
  assert (node->op == op_FuncCall);
  return node->attr.call.cld_tp = skip_tid(node->attr.call.cld_tp);
}

sel_attr
get_irn_sel_attr (ir_node *node)
{
  assert (node->op == op_Sel);
  return node->attr.s;
}

int
get_irn_phi_attr (ir_node *node)
{
  assert (node->op == op_Phi);
  return node->attr.phi0_pos;
}

block_attr
get_irn_block_attr (ir_node *node)
{
  assert (node->op == op_Block);
  return node->attr.block;
}

/** manipulate fields of individual nodes **/

/* this works for all except Block */
ir_node *
get_nodes_Block (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);
}

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

/* Test whether arbitrary node is globals pointer, i.e. Proj(pn_Start_P_globals)
 * from Start.  If so returns global type, else Null. */
type *is_globals_pointer(ir_node *n) {
  if ((get_irn_op(n) == op_Proj) &&
      (get_Proj_proj(n) == pn_Start_P_globals)) {
    ir_node *start = get_Proj_pred(n);
    if (get_irn_op(start) == op_Start) {
      return get_glob_type();
    }
  }
  return NULL;
}

/* Test whether arbitrary node is value arg base, i.e. Proj(pn_Start_P_value_arg_base)
 * from Start.  If so returns 1, else 0. */
int is_value_arg_pointer(ir_node *n) {
  if ((get_irn_op(n) == op_Proj) &&
      (get_Proj_proj(n) == pn_Start_P_value_arg_base) &&
      (get_irn_op(get_Proj_pred(n)) == op_Start))
    return 1;
  return 0;
}

/* Returns an array with the predecessors of the Block. Depending on
   the implementation of the graph data structure this can be a copy of
   the internal representation of predecessors as well as the internal
   array itself. Therefore writing to this array might obstruct the ir. */
ir_node **
get_Block_cfgpred_arr (ir_node *node)
{
  assert ((node->op == op_Block));
  return (ir_node **)&(get_irn_in(node)[1]);
}


int
get_Block_n_cfgpreds (ir_node *node) {
  assert ((node->op == op_Block));
  return get_irn_arity(node);
}

ir_node *
get_Block_cfgpred (ir_node *node, int pos) {
  assert(node);
  assert (node->op == op_Block);
  assert(-1 <= pos && pos < get_irn_arity(node));
  return get_irn_n(node, pos);
}

void
set_Block_cfgpred (ir_node *node, int pos, ir_node *pred) {
  assert (node->op == op_Block);
  set_irn_n(node, pos, pred);
}

bool
get_Block_matured (ir_node *node) {
  assert (node->op == op_Block);
  return node->attr.block.matured;
}

void
set_Block_matured (ir_node *node, bool matured) {
  assert (node->op == op_Block);
  node->attr.block.matured = matured;
}
unsigned long
get_Block_block_visited (ir_node *node) {
  assert (node->op == op_Block);
  return node->attr.block.block_visited;
}

void
set_Block_block_visited (ir_node *node, unsigned long visit) {
  assert (node->op == op_Block);
  node->attr.block.block_visited = visit;
}

/* For this current_ir_graph must be set. */
void
mark_Block_block_visited (ir_node *node) {
  assert (node->op == op_Block);
  node->attr.block.block_visited = get_irg_block_visited(current_ir_graph);
}

int
Block_not_block_visited(ir_node *node) {
  assert (node->op == op_Block);
  return (node->attr.block.block_visited < get_irg_block_visited(current_ir_graph));
}

ir_node *
get_Block_graph_arr (ir_node *node, int pos) {
  assert (node->op == op_Block);
  return node->attr.block.graph_arr[pos+1];
}

void
set_Block_graph_arr (ir_node *node, int pos, ir_node *value) {
  assert (node->op == op_Block);
  node->attr.block.graph_arr[pos+1] = value;
}

/* handler handling for Blocks * /
void
set_Block_handler (ir_node *block, ir_node *handler)  {
  assert ((block->op == op_Block));
  assert ((handler->op == op_Block));
  block->attr.block.handler_entry = handler;
}

ir_node *
get_Block_handler (ir_node *block) {
  assert ((block->op == op_Block));
  return (block->attr.block.handler_entry);
}

/ * handler handling for Nodes * /
void
set_Node_handler (ir_node *node, ir_node *handler) {
  set_Block_handler (get_nodes_Block (node), handler);
}

ir_node *
get_Node_handler (ir_node *node) {
  return (get_Block_handler (get_nodes_Block (node)));
}

/ * exc_t handling for Blocks * /
void set_Block_exc (ir_node *block, exc_t exc) {
  assert ((block->op == op_Block));
  block->attr.block.exc = exc;
}

exc_t get_Block_exc (ir_node *block) {
  assert ((block->op == op_Block));
  return (block->attr.block.exc);
}

/ * exc_t handling for Nodes * /
void set_Node_exc (ir_node *node, exc_t exc) {
  set_Block_exc (get_nodes_Block (node), exc);
}

exc_t get_Node_exc (ir_node *node) {
  return (get_Block_exc (get_nodes_Block (node)));
}
*/

void set_Block_cg_cfgpred_arr(ir_node * node, int arity, ir_node ** in) {
  assert(node->op == op_Block);
  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. */
      bool ipv = interprocedural_view;
      interprocedural_view = true;
      fix_backedges(current_ir_graph->obst, node);
      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(node->op == op_Block &&
         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(node->op == op_Block);
  return node->attr.block.in_cg == NULL ? NULL : node->attr.block.in_cg  + 1;
}

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

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

void remove_Block_cg_cfgpred_arr(ir_node * node) {
  assert(node->op == op_Block);
  node->attr.block.in_cg = NULL;
}

/* Start references the irg it is in. */
ir_graph *
get_Start_irg(ir_node *node) {
  return get_irn_irg(node);
}

void
set_Start_irg(ir_node *node, ir_graph *irg) {
  assert(node->op == op_Start);
  assert(is_ir_graph(irg));
  assert(0 && " Why set irg? -- use set_irn_irg");
}

int
get_End_n_keepalives(ir_node *end) {
  assert (end->op == op_End);
  return (get_irn_arity(end) - END_KEEPALIVE_OFFSET);
}

ir_node *
get_End_keepalive(ir_node *end, int pos) {
  assert (end->op == op_End);
  return get_irn_n(end, pos + END_KEEPALIVE_OFFSET);
}

void
add_End_keepalive (ir_node *end, ir_node *ka) {
  assert (end->op == op_End);
  ARR_APP1 (ir_node *, end->in, ka);
}

void
set_End_keepalive(ir_node *end, int pos, ir_node *ka) {
  assert (end->op == op_End);
  set_irn_n(end, pos + END_KEEPALIVE_OFFSET, ka);
}

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

ir_graph *get_EndReg_irg (ir_node *end) {
  return get_irn_irg(end);
}

ir_graph *get_EndExcept_irg  (ir_node *end) {
  return get_irn_irg(end);
}

/*
> Implementing the case construct (which is where the constant Proj node is
> important) involves far more than simply determining the constant values.
> We could argue that this is more properly a function of the translator from
> Firm to the target machine.  That could be done if there was some way of
> projecting "default" out of the Cond node.
I know it's complicated.
Basically there are two proglems:
 - determining the gaps between the projs
 - determining the biggest case constant to know the proj number for
   the default node.
I see several solutions:
1. Introduce a ProjDefault node.  Solves both problems.
   This means to extend all optimizations executed during construction.
2. Give the Cond node for switch two flavors:
   a) there are no gaps in the projs  (existing flavor)
   b) gaps may exist, default proj is still the Proj with the largest
      projection number.  This covers also the gaps.
3. Fix the semantic of the Cond to that of 2b)

Solution 2 seems to be the best:
Computing the gaps in the Firm representation is not too hard, i.e.,
libFIRM can implement a routine that transforms between the two
flavours.  This is also possible for 1) but 2) does not require to
change any existing optimization.
Further it should be far simpler to determine the biggest constant than
to compute all gaps.
I don't want to choose 3) as 2a) seems to have advantages for
dataflow analysis and 3) does not allow to convert the representation to
2a).
*/
ir_node *
get_Cond_selector (ir_node *node) {
  assert (node->op == op_Cond);
  return get_irn_n(node, 0);
}

void
set_Cond_selector (ir_node *node, ir_node *selector) {
  assert (node->op == op_Cond);
  set_irn_n(node, 0, selector);
}

cond_kind
get_Cond_kind (ir_node *node) {
  assert (node->op == op_Cond);
  return node->attr.c.kind;
}

void
set_Cond_kind (ir_node *node, cond_kind kind) {
  assert (node->op == op_Cond);
  node->attr.c.kind = kind;
}

long
get_Cond_defaultProj (ir_node *node) {
  assert (node->op == op_Cond);
  return node->attr.c.default_proj;
}

ir_node *
get_Return_mem (ir_node *node) {
  assert (node->op == op_Return);
  return get_irn_n(node, 0);
}

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

int
get_Return_n_ress (ir_node *node) {
  assert (node->op == op_Return);
  return (get_irn_arity(node) - RETURN_RESULT_OFFSET);
}

ir_node **
get_Return_res_arr (ir_node *node)
{
  assert ((node->op == op_Return));
  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 (node->op == op_Return);
}
*/

ir_node *
get_Return_res (ir_node *node, int pos) {
  assert (node->op == op_Return);
  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 (node->op == op_Return);
  set_irn_n(node, pos + RETURN_RESULT_OFFSET, res);
}

ir_node *
get_Raise_mem (ir_node *node) {
  assert (node->op == op_Raise);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Raise_exo_ptr (ir_node *node) {
  assert (node->op == op_Raise);
  return get_irn_n(node, 1);
}

void
set_Raise_exo_ptr (ir_node *node, ir_node *exo_ptr) {
  assert (node->op == op_Raise);
  set_irn_n(node, 1, exo_ptr);
}

tarval *get_Const_tarval (ir_node *node) {
  assert (node->op == op_Const);
  return node->attr.con.tv;
}

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


/* 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. */
type *
get_Const_type (ir_node *node) {
  assert (node->op == op_Const);
  return node->attr.con.tp;
}

void
set_Const_type (ir_node *node, type *tp) {
  assert (node->op == op_Const);
  if (tp != unknown_type) {
    assert (is_atomic_type(tp));
    assert (get_type_mode(tp) == get_irn_mode(node));
    assert (!tarval_is_entity(get_Const_tarval(node)) ||
            (is_pointer_type(tp) &&
             (get_pointer_points_to_type(tp) ==
              get_entity_type(get_tarval_entity(get_Const_tarval(node))))));
  }

  node->attr.con.tp = tp;
}


symconst_kind
get_SymConst_kind (const ir_node *node) {
  assert (node->op == op_SymConst);
  return node->attr.i.num;
}

void
set_SymConst_kind (ir_node *node, symconst_kind num) {
  assert (node->op == op_SymConst);
  node->attr.i.num = num;
}

type *
get_SymConst_type (ir_node *node) {
  assert (   (node->op == op_SymConst)
          && (   get_SymConst_kind(node) == type_tag
              || get_SymConst_kind(node) == size));
  return node->attr.i.tori.typ = skip_tid(node->attr.i.tori.typ);
}

void
set_SymConst_type (ir_node *node, type *tp) {
  assert (   (node->op == op_SymConst)
          && (   get_SymConst_kind(node) == type_tag
              || get_SymConst_kind(node) == size));
  node->attr.i.tori.typ = tp;
}

ident *
get_SymConst_ptrinfo (ir_node *node) {
  assert (   (node->op == op_SymConst)
          && (get_SymConst_kind(node) == linkage_ptr_info));
  return node->attr.i.tori.ptrinfo;
}

void
set_SymConst_ptrinfo (ir_node *node, ident *ptrinfo) {
  assert (   (node->op == op_SymConst)
          && (get_SymConst_kind(node) == linkage_ptr_info));
  node->attr.i.tori.ptrinfo = ptrinfo;
}

type_or_id_p
get_SymConst_type_or_id (ir_node *node) {
  assert (node->op == op_SymConst);
  return &(node->attr.i.tori);
}

void
set_SymConst_type_or_id (ir_node *node, type_or_id_p tori) {
  assert (node->op == op_SymConst);
  memcpy (&(node->attr.i.tori), tori, sizeof(type_or_id));
}

ir_node *
get_Sel_mem (ir_node *node) {
  assert (node->op == op_Sel);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Sel_ptr (ir_node *node) {
  assert (node->op == op_Sel);
  return get_irn_n(node, 1);
}

void
set_Sel_ptr (ir_node *node, ir_node *ptr) {
  assert (node->op == op_Sel);
  set_irn_n(node, 1, ptr);
}

int
get_Sel_n_indexs (ir_node *node) {
  assert (node->op == op_Sel);
  return (get_irn_arity(node) - SEL_INDEX_OFFSET);
}

ir_node **
get_Sel_index_arr (ir_node *node)
{
  assert ((node->op == op_Sel));
  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 (ir_node *node, int pos) {
  assert (node->op == op_Sel);
  return get_irn_n(node, pos + SEL_INDEX_OFFSET);
}

void
set_Sel_index (ir_node *node, int pos, ir_node *index) {
  assert (node->op == op_Sel);
  set_irn_n(node, pos + SEL_INDEX_OFFSET, index);
}

entity *
get_Sel_entity (ir_node *node) {
  assert (node->op == op_Sel);
  return node->attr.s.ent;
}

void
set_Sel_entity (ir_node *node, entity *ent) {
  assert (node->op == op_Sel);
  node->attr.s.ent = ent;
}

type *
get_InstOf_ent (ir_node *node) {
  assert (node->op = op_InstOf);
  return (node->attr.io.ent);
}

void
set_InstOf_ent (ir_node *node, type *ent) {
  assert (node->op = op_InstOf);
  node->attr.io.ent = ent;
}

ir_node *
get_InstOf_store (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 (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);
}


/* 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 (ir_node *node) {
  assert (node->op == op_Call);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Call_ptr (ir_node *node) {
  assert (node->op == op_Call);
  return get_irn_n(node, 1);
}

void
set_Call_ptr (ir_node *node, ir_node *ptr) {
  assert (node->op == op_Call);
  set_irn_n(node, 1, ptr);
}

ir_node **
get_Call_param_arr (ir_node *node) {
  assert (node->op == op_Call);
  return (ir_node **)&get_irn_in(node)[CALL_PARAM_OFFSET + 1];
}

int
get_Call_n_params (ir_node *node)  {
  assert (node->op == op_Call);
  return (get_irn_arity(node) - CALL_PARAM_OFFSET);
}

int
get_Call_arity (ir_node *node) {
  assert (node->op == op_Call);
  return get_Call_n_params(node);
}

/* void
set_Call_arity (ir_node *node, ir_node *arity) {
  assert (node->op == op_Call);
}
*/

ir_node *
get_Call_param (ir_node *node, int pos) {
  assert (node->op == op_Call);
  return get_irn_n(node, pos + CALL_PARAM_OFFSET);
}

void
set_Call_param (ir_node *node, int pos, ir_node *param) {
  assert (node->op == op_Call);
  set_irn_n(node, pos + CALL_PARAM_OFFSET, param);
}

type *
get_Call_type (ir_node *node) {
  assert (node->op == op_Call);
  return node->attr.call.cld_tp = skip_tid(node->attr.call.cld_tp);
}

void
set_Call_type (ir_node *node, type *tp) {
  assert (node->op == op_Call);
  assert (is_method_type(tp));
  node->attr.call.cld_tp = tp;
}

int Call_has_callees(ir_node *node) {
  return (node->attr.call.callee_arr != NULL);
}

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

entity * get_Call_callee(ir_node * node, int pos) {
  assert(node->op == op_Call && node->attr.call.callee_arr);
  return node->attr.call.callee_arr[pos];
}

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

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

ir_node * get_CallBegin_ptr (ir_node *node) {
  assert(node->op == op_CallBegin);
  return get_irn_n(node, 0);
}
void set_CallBegin_ptr (ir_node *node, ir_node *ptr) {
  assert(node->op == op_CallBegin);
  set_irn_n(node, 0, ptr);
}
ir_graph * get_CallBegin_irg (ir_node *node) {
  return get_irn_irg(node);
}
ir_node * get_CallBegin_call (ir_node *node) {
  assert(node->op == op_CallBegin);
  return node->attr.callbegin.call;
}
void  set_CallBegin_call (ir_node *node, ir_node *call) {
  assert(node->op == op_CallBegin);
  node->attr.callbegin.call = call;
}

ir_node *
get_FuncCall_ptr (ir_node *node) {
  assert (node->op == op_FuncCall);
  return get_irn_n(node, 0);
}

void
set_FuncCall_ptr (ir_node *node, ir_node *ptr) {
  assert (node->op == op_FuncCall);
  set_irn_n(node, 0, ptr);
}

ir_node **
get_FuncCall_param_arr (ir_node *node) {
  assert (node->op == op_FuncCall);
  return (ir_node **)&get_irn_in(node)[CALL_PARAM_OFFSET];
}

int
get_FuncCall_n_params (ir_node *node)  {
  assert (node->op == op_FuncCall);
  return (get_irn_arity(node) - CALL_PARAM_OFFSET);
}

int
get_FuncCall_arity (ir_node *node) {
  assert (node->op == op_FuncCall);
  return get_FuncCall_n_params(node);
}

/* void
set_FuncCall_arity (ir_node *node, ir_node *arity) {
  assert (node->op == op_FuncCall);
}
*/

ir_node *
get_FuncCall_param (ir_node *node, int pos) {
  assert (node->op == op_FuncCall);
  return get_irn_n(node, pos + CALL_PARAM_OFFSET);
}

void
set_FuncCall_param (ir_node *node, int pos, ir_node *param) {
  assert (node->op == op_FuncCall);
  set_irn_n(node, pos + CALL_PARAM_OFFSET, param);
}

type *
get_FuncCall_type (ir_node *node) {
  assert (node->op == op_FuncCall);
  return node->attr.call.cld_tp = skip_tid(node->attr.call.cld_tp);
}

void
set_FuncCall_type (ir_node *node, type *tp) {
  assert (node->op == op_FuncCall);
  assert (is_method_type(tp));
  node->attr.call.cld_tp = tp;
}

int FuncCall_has_callees(ir_node *node) {
  return (node->attr.call.callee_arr != NULL);
}

int get_FuncCall_n_callees(ir_node * node) {
  assert(node->op == op_FuncCall && node->attr.call.callee_arr);
  return ARR_LEN(node->attr.call.callee_arr);
}

entity * get_FuncCall_callee(ir_node * node, int pos) {
  assert(node->op == op_FuncCall && node->attr.call.callee_arr);
  return node->attr.call.callee_arr[pos];
}

void set_FuncCall_callee_arr(ir_node * node, int n, entity ** arr) {
  assert(node->op == op_FuncCall);
  if (node->attr.call.callee_arr == NULL || get_Call_n_callees(node) != n) {
    node->attr.call.callee_arr = NEW_ARR_D(entity *, current_ir_graph->obst, n);
  }
  memcpy(node->attr.call.callee_arr, arr, n * sizeof(entity *));
}

void remove_FuncCall_callee_arr(ir_node * node) {
  assert(node->op == op_FuncCall);
  node->attr.call.callee_arr = NULL;
}


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

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

BINOP(Add)
BINOP(Sub)
UNOP(Minus)
BINOP(Mul)
BINOP(Quot)

ir_node *
get_Quot_mem (ir_node *node) {
  assert (node->op == op_Quot);
  return get_irn_n(node, 0);
}

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

BINOP(DivMod)

ir_node *
get_DivMod_mem (ir_node *node) {
  assert (node->op == op_DivMod);
  return get_irn_n(node, 0);
}

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

BINOP(Div)

ir_node *
get_Div_mem (ir_node *node) {
  assert (node->op == op_Div);
  return get_irn_n(node, 0);
}

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

BINOP(Mod)

ir_node *
get_Mod_mem (ir_node *node) {
  assert (node->op == op_Mod);
  return get_irn_n(node, 0);
}

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

UNOP(Abs)
BINOP(And)
BINOP(Or)
BINOP(Eor)
UNOP(Not)
BINOP(Shl)
BINOP(Shr)
BINOP(Shrs)
BINOP(Rot)
BINOP(Cmp)
UNOP(Conv)
UNOP(Cast)

type *
get_Cast_type (ir_node *node) {
  assert (node->op == op_Cast);
  return node->attr.cast.totype;
}

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

int
is_unop (ir_node *node) {
  return (node->op->opar == oparity_unary);
}

ir_node *
get_unop_op (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 (ir_node *node) {
  return (node->op->opar == oparity_binary);
}

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

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

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

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

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

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

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

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

int is_Phi (ir_node *n) {
  ir_op *op;

  assert(n);
  op = get_irn_op(n);

  if (op == op_Filter) return interprocedural_view;

  if (op == op_Phi)
    return  ((get_irg_phase_state(get_irn_irg(n)) !=  phase_building) ||
             (get_irn_arity(n) > 0));

  return 0;
}

int is_Phi0 (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 (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 (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_Load_mem (ir_node *node) {
  assert (node->op == op_Load);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Load_ptr (ir_node *node) {
  assert (node->op == op_Load);
  return get_irn_n(node, 1);
}

void
set_Load_ptr (ir_node *node, ir_node *ptr) {
  assert (node->op == op_Load);
  set_irn_n(node, 1, ptr);
}


ir_node *
get_Store_mem (ir_node *node) {
  assert (node->op == op_Store);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Store_ptr (ir_node *node) {
  assert (node->op == op_Store);
  return get_irn_n(node, 1);
}

void
set_Store_ptr (ir_node *node, ir_node *ptr) {
  assert (node->op == op_Store);
  set_irn_n(node, 1, ptr);
}

ir_node *
get_Store_value (ir_node *node) {
  assert (node->op == op_Store);
  return get_irn_n(node, 2);
}

void
set_Store_value (ir_node *node, ir_node *value) {
  assert (node->op == op_Store);
  set_irn_n(node, 2, value);
}

ir_node *
get_Alloc_mem (ir_node *node) {
  assert (node->op == op_Alloc);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Alloc_size (ir_node *node) {
  assert (node->op == op_Alloc);
  return get_irn_n(node, 1);
}

void
set_Alloc_size (ir_node *node, ir_node *size) {
  assert (node->op == op_Alloc);
  set_irn_n(node, 1, size);
}

type  *
get_Alloc_type (ir_node *node) {
  assert (node->op == op_Alloc);
  return node->attr.a.type = skip_tid(node->attr.a.type);
}

void
set_Alloc_type (ir_node *node, type *tp) {
  assert (node->op == op_Alloc);
  node->attr.a.type = tp;
}

where_alloc
get_Alloc_where (ir_node *node) {
  assert (node->op == op_Alloc);
  return node->attr.a.where;
}

void
set_Alloc_where (ir_node *node, where_alloc where) {
  assert (node->op == op_Alloc);
  node->attr.a.where = where;
}


ir_node *
get_Free_mem (ir_node *node) {
  assert (node->op == op_Free);
  return get_irn_n(node, 0);
}

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

ir_node *
get_Free_ptr (ir_node *node) {
  assert (node->op == op_Free);
  return get_irn_n(node, 1);
}

void
set_Free_ptr (ir_node *node, ir_node *ptr) {
  assert (node->op == op_Free);
  set_irn_n(node, 1, ptr);
}

ir_node *
get_Free_size (ir_node *node) {
  assert (node->op == op_Free);
  return get_irn_n(node, 2);
}

void
set_Free_size (ir_node *node, ir_node *size) {
  assert (node->op == op_Free);
  set_irn_n(node, 2, size);
}

type  *
get_Free_type (ir_node *node) {
  assert (node->op == op_Free);
  return node->attr.f = skip_tid(node->attr.f);
}

void
set_Free_type (ir_node *node, type *tp) {
  assert (node->op == op_Free);
  node->attr.f = tp;
}

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

int
get_Sync_n_preds (ir_node *node) {
  assert (node->op == op_Sync);
  return (get_irn_arity(node));
}

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

ir_node *
get_Sync_pred (ir_node *node, int pos) {
  assert (node->op == op_Sync);
  return get_irn_n(node, pos);
}

void
set_Sync_pred (ir_node *node, int pos, ir_node *pred) {
  assert (node->op == op_Sync);
  set_irn_n(node, pos, pred);
}

ir_node *
get_Proj_pred (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 (ir_node *node) {
  assert (is_Proj(node));
  if (get_irn_opcode(node) == iro_Proj) {
    return node->attr.proj;
  } else {
    assert(get_irn_opcode(node) == iro_Filter);
    return node->attr.filter.proj;
  }
}

void
set_Proj_proj (ir_node *node, long proj) {
  assert (node->op == op_Proj);
  node->attr.proj = proj;
}

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

int
get_Tuple_n_preds (ir_node *node) {
  assert (node->op == op_Tuple);
  return (get_irn_arity(node));
}

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

ir_node *
get_Tuple_pred (ir_node *node, int pos) {
  assert (node->op == op_Tuple);
  return get_irn_n(node, pos);
}

void
set_Tuple_pred (ir_node *node, int pos, ir_node *pred) {
  assert (node->op == op_Tuple);
  set_irn_n(node, pos, pred);
}

ir_node *
get_Id_pred (ir_node *node) {
  assert (node->op == op_Id);
  return get_irn_n(node, 0);
}

void
set_Id_pred (ir_node *node, ir_node *pred) {
  assert (node->op == op_Id);
  set_irn_n(node, 0, pred);
}

ir_node *get_Confirm_value (ir_node *node) {
  assert (node->op == op_Confirm);
  return get_irn_n(node, 0);
}
void     set_Confirm_value (ir_node *node, ir_node *value) {
  assert (node->op == op_Confirm);
  set_irn_n(node, 0, value);
}
ir_node *get_Confirm_bound (ir_node *node) {
  assert (node->op == op_Confirm);
  return get_irn_n(node, 1);
}
void     set_Confirm_bound (ir_node *node, ir_node *bound) {
  assert (node->op == op_Confirm);
  set_irn_n(node, 0, bound);
}
pn_Cmp   get_Confirm_cmp   (ir_node *node) {
  assert (node->op == op_Confirm);
  return node->attr.confirm_cmp;
}
void     set_Confirm_cmp   (ir_node *node, pn_Cmp cmp) {
  assert (node->op == op_Confirm);
  node->attr.confirm_cmp = cmp;
}


ir_node *
get_Filter_pred (ir_node *node) {
  assert(node->op == op_Filter);
  return node->in[1];
}
void
set_Filter_pred (ir_node *node, ir_node *pred) {
  assert(node->op == op_Filter);
  node->in[1] = pred;
}
long
get_Filter_proj(ir_node *node) {
  assert(node->op == op_Filter);
  return node->attr.filter.proj;
}
void
set_Filter_proj (ir_node *node, long proj) {
  assert(node->op == op_Filter);
  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(node->op == op_Filter);
  if (node->attr.filter.in_cg == NULL || arity != ARR_LEN(node->attr.filter.in_cg) - 1) {
    node->attr.filter.in_cg = NEW_ARR_D(ir_node *, current_ir_graph->obst, arity + 1);
    node->attr.filter.backedge = NEW_ARR_D (int, current_ir_graph->obst, arity);
    memset(node->attr.filter.backedge, 0, sizeof(int) * 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(node->op == op_Filter && 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(node->op == op_Filter && 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(node->op == op_Filter && 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];
}


ir_graph *
get_irn_irg(ir_node *node) {
  if (get_irn_op(node) != op_Block)
    node = get_nodes_block(node);
  if (is_Bad(node))  /* sometimes bad is predecessor of nodes instead of block: in case of optimization */
    node = get_nodes_block(node);
  assert(get_irn_op(node) == op_Block);
  return node->attr.block.irg;
}


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

ir_node *
skip_Proj (ir_node *node) {
  /* don't assert node !!! */
  if (node && is_Proj(node)) {
    return get_Proj_pred(node);
  } else {
    return node;
  }
}

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

  if (!get_opt_normalize()) return node;

  node = skip_nop(node);
  if (get_irn_op(node) == op_Proj) {
    pred = skip_nop(get_Proj_pred(node));
    if (get_irn_op(pred) == op_Proj) /* nested Tuple ? */
      pred = skip_nop(skip_Tuple(pred));
    if (get_irn_op(pred) == op_Tuple)
      return get_Tuple_pred(pred, get_Proj_proj(node));
  }
  return node;
}

/** returns operand of node if node is a Cast */
ir_node *skip_Cast  (ir_node *node) {
  if (node && get_irn_op(node) == op_Cast) {
    return skip_nop(get_irn_n(node, 0));
  } else {
    return node;
  }
}

#if 0
/* 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. */
ir_node *
skip_nop (ir_node *node) {
  /* don't assert node !!! */

  if (!get_opt_normalize()) return node;

  /* Don't use get_Id_pred:  We get into an endless loop for
     self-referencing Ids. */
  if (node && (node->op == op_Id) && (node != node->in[0+1])) {
    ir_node *rem_pred = node->in[0+1];
    ir_node *res;

    assert (get_irn_arity (node) > 0);

    node->in[0+1] = node;
    res = skip_nop(rem_pred);
    if (res->op == op_Id) /* self-loop */ return node;

    node->in[0+1] = res;
    return res;
  } else {
    return node;
  }
}
#else
/* 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. */
ir_node *
skip_nop (ir_node *node) {
  ir_node *pred;
  /* don't assert node !!! */

  if (!get_opt_normalize()) return node;

  /* Don't use get_Id_pred:  We get into an endless loop for
     self-referencing Ids. */
  if (node && (node->op == op_Id) && (node != (pred = node->in[0+1]))) {
    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;
    res = skip_nop(rem_pred);
    if (res->op == op_Id) /* self-loop */ return node;

    node->in[0+1] = res;
    return res;
  } else {
    return node;
  }
}
#endif

ir_node *
skip_Id (ir_node *node) {
  return skip_nop(node);
}

int
is_Bad (ir_node *node) {
  assert(node);
  if ((node) && get_irn_opcode(node) == iro_Bad)
    return 1;
  return 0;
}

int
is_no_Block (ir_node *node) {
  assert(node);
  return (get_irn_opcode(node) != iro_Block);
}

int
is_Block (ir_node *node) {
  assert(node);
  return (get_irn_opcode(node) == iro_Block);
}

/* returns true if node is a Unknown node. */
int
is_Unknown (ir_node *node) {
  assert(node);
  return (get_irn_opcode(node) == iro_Unknown);
}

int
is_Proj (const ir_node *node) {
  assert(node);
  return node->op == op_Proj
    || (!interprocedural_view && node->op == op_Filter);
}

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

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

ir_graph *get_ip_cfop_irg(ir_node *n) {
  return get_irn_irg(n);
}

/* Returns true if the operation can change the control flow because
   of an exception. */
int
is_fragile_op(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 :
    return get_irn_n(node, 0);
  case iro_Bad   :
  case iro_Unknown:
    return node;
  default: ;
    assert(0 && "should not be reached");
    return NULL;
  }
}

#ifdef DEBUG_libfirm
void dump_irn (ir_node *n) {
  int i, arity = get_irn_arity(n);
  printf("%s%s: %ld (%p)\n", get_irn_opname(n), get_mode_name(get_irn_mode(n)), get_irn_node_nr(n), (void *)n);
  if (!is_Block(n)) {
    ir_node *pred = get_irn_n(n, -1);
    printf("  block: %s%s: %ld (%p)\n", get_irn_opname(pred), get_mode_name(get_irn_mode(pred)),
           get_irn_node_nr(pred), (void *)pred);
  }
  printf("  preds: \n");
  for (i = 0; i < arity; ++i) {
    ir_node *pred = get_irn_n(n, i);
    printf("    %d: %s%s: %ld (%p)\n", i, get_irn_opname(pred), get_mode_name(get_irn_mode(pred)),
           get_irn_node_nr(pred), (void *)pred);
  }
}

#else  /* DEBUG_libfirm */
void dump_irn (ir_node *n) {}
#endif /* DEBUG_libfirm */