Check that binary Cond has two successors if outs are available

[libfirm] / ir / ir / irvrfy.c

/*
 * Project:     libFIRM
 * File name:   ir/ir/irvrfy.c
 * Purpose:     Check irnodes for correctness.
 * Author:      Christian Schaefer
 * Modified by: Goetz Lindenmaier. Till Riedel. Michael Beck.
 * 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 "irprog.h"
# include "irop_t.h"
# include "irgraph_t.h"
# include "ircgcons.h"
# include "irvrfy_t.h"
# include "irgwalk.h"
# include "irdump.h"
# include "irdom_t.h"
# include "irprintf.h"

/** if this flag is set, verify entity types in Load & Store nodes */
static int vrfy_entities = 0;

node_verification_t opt_do_node_verification = NODE_VERIFICATION_ON;
const char *firm_vrfy_failure_msg;

/* enable verification of Load/Store entities */
void vrfy_enable_entity_tests(int enable) {
  vrfy_entities = enable;
}

/**
 * little helper for NULL modes
 */
static const char *get_mode_name_ex(ir_mode *mode) {
  if (! mode)
    return "<no mode>";
  return get_mode_name(mode);
}

void do_node_verification(node_verification_t mode) {
  opt_do_node_verification = mode;
}

/** the last IRG, on which a verify error was found */
static ir_graph *last_irg_error = NULL;

/**
 * print the name of the entity of an verification failure
 */
static void show_entity_failure(ir_node *node)
{
  ir_graph *irg = get_irn_irg(node);

  if (last_irg_error == irg)
    return;

  last_irg_error = irg;

  if (irg == get_const_code_irg()) {
    fprintf(stderr, "\nFIRM: irn_vrfy_irg() <of CONST_CODE_IRG> failed\n");
  }
  else {
    entity *ent = get_irg_entity(irg);

    if (ent) {
      type *ent_type = get_entity_owner(ent);

      if (ent_type) {
        if (ent_type == get_glob_type())
          fprintf(stderr, "\nFIRM: irn_vrfy_irg() %s failed\n", get_entity_name(ent));
        else
          fprintf(stderr, "\nFIRM: irn_vrfy_irg() %s::%s failed\n", get_type_name(ent_type), get_entity_name(ent));
      }
      else {
          fprintf(stderr, "\nFIRM: irn_vrfy_irg() <NULL>::%s failed\n", get_entity_name(ent));
      }
    }
    else {
     fprintf(stderr, "\nFIRM: irn_vrfy_irg() <IRG %p> failed\n", (void *)irg);
    }
  }
}

/**
 * Prints a failure for a Node
 */
static void show_node_failure(ir_node *n)
{
  show_entity_failure(n);
  fprintf(stderr, "  node %ld %s%s\n" ,
    get_irn_node_nr(n),
    get_irn_opname(n), get_irn_modename(n)
  );
}

/**
 * Prints a failure message for a binop
 */
static void show_binop_failure(ir_node *n, const char *text)
{
  ir_node *left  = get_binop_left(n);
  ir_node *right = get_binop_right(n);

  show_entity_failure(n);
  fprintf(stderr, "  node %ld %s%s(%s%s, %s%s) did not match (%s)\n",
      get_irn_node_nr(n),
      get_irn_opname(n), get_irn_modename(n),
      get_irn_opname(left), get_irn_modename(left),
      get_irn_opname(right), get_irn_modename(right),
      text);
}

/**
 * Prints a failure message for an unop
 */
static void show_unop_failure(ir_node *n, const char *text)
{
  ir_node *op  = get_unop_op(n);

  show_entity_failure(n);
  fprintf(stderr, "  node %ld %s%s(%s%s) did not match (%s)\n",
      get_irn_node_nr(n),
      get_irn_opname(n), get_irn_modename(n),
      get_irn_opname(op), get_irn_modename(op),
      text);
}

/**
 * Prints a failure message for an op with 3 operands
 */
static void show_triop_failure(ir_node *n, const char *text)
{
  ir_node *op0  = get_irn_n(n, 0);
  ir_node *op1  = get_irn_n(n, 1);
  ir_node *op2  = get_irn_n(n, 2);

  show_entity_failure(n);
  fprintf(stderr, "  of node %ld %s%s(%s%s, %s%s, %s%s) did not match (%s)\n",
      get_irn_node_nr(n),
      get_irn_opname(n), get_irn_modename(n),
      get_irn_opname(op0), get_irn_modename(op0),
      get_irn_opname(op1), get_irn_modename(op1),
      get_irn_opname(op2), get_irn_modename(op2),
      text);
}

/**
 * Prints a failure message for a proj
 */
static void show_proj_failure(ir_node *n)
{
  ir_node *op  = get_Proj_pred(n);
  int proj     = get_Proj_proj(n);

  show_entity_failure(n);
  fprintf(stderr, "  node %ld %s%s %d(%s%s) failed\n" ,
      get_irn_node_nr(n),
      get_irn_opname(n), get_irn_modename(n), proj,
      get_irn_opname(op), get_irn_modename(op));
}

/**
 * Prints a failure message for a proj from Start
 */
static void show_proj_mode_failure(ir_node *n, type *ty)
{
  long proj  = get_Proj_proj(n);
  ir_mode *m = get_type_mode(ty);

  show_entity_failure(n);
  fprintf(stderr, "  Proj %ld mode %s proj %ld (type %s mode %s) failed\n" ,
      get_irn_node_nr(n),
      get_irn_modename(n),
      proj,
      get_type_name(ty),
      get_mode_name_ex(m));
}

/**
 * Prints a failure message for a proj
 */
static void show_proj_failure_ent(ir_node *n, entity *ent)
{
  ir_node *op  = get_Proj_pred(n);
  int proj     = get_Proj_proj(n);
  ir_mode *m   = get_type_mode(get_entity_type(ent));

  show_entity_failure(n);
  fprintf(stderr, "  node %ld %s%s %d(%s%s) entity %s(type %s mode %s)failed\n" ,
      get_irn_node_nr(n),
      get_irn_opname(n), get_irn_modename(n), proj,
      get_irn_opname(op), get_irn_modename(op),
      get_entity_name(ent), get_type_name(get_entity_type(ent)),
      get_mode_name_ex(m));
}

/**
 * Show a node and a graph
 */
static void show_node_on_graph(ir_graph *irg, ir_node *n)
{
  entity *ent = get_irg_entity(irg);

  if (ent)
    fprintf(stderr, "\nFIRM: irn_vrfy_irg() of entity %s, node %ld %s%s\n",
      get_entity_name(ent),
      get_irn_node_nr(n), get_irn_opname(n), get_irn_modename(n));
  else
    fprintf(stderr, "\nFIRM: irn_vrfy_irg() of graph %p, node %ld %s%s\n",
      (void *)irg,
      get_irn_node_nr(n), get_irn_opname(n), get_irn_modename(n));
}

/**
 * Show call params
 */
static void show_call_param(ir_node *n, type *mt)
{
  int i;

  show_entity_failure(n);
  fprintf(stderr, "  Call type-check failed: %s(", get_type_name(mt));
  for (i = 0; i < get_method_n_params(mt); ++i) {
    fprintf(stderr, "%s ", get_mode_name_ex(get_type_mode(get_method_param_type(mt, i))));
  }
  fprintf(stderr, ") != CALL(");

  for (i = 0; i < get_Call_n_params(n); ++i) {
    fprintf(stderr, "%s ", get_mode_name_ex(get_irn_mode(get_Call_param(n, i))));
  }
  fprintf(stderr, ")\n");

}

/**
 * Show return modes
 */
static void show_return_modes(ir_graph *irg, ir_node *n, type *mt, int i)
{
  entity *ent = get_irg_entity(irg);

  show_entity_failure(n);
  fprintf(stderr, "  Return node %ld in entity \"%s\" mode %s different from type mode %s\n",
    get_irn_node_nr(n), get_entity_name(ent),
    get_mode_name_ex(get_irn_mode(get_Return_res(n, i))),
    get_mode_name_ex(get_type_mode(get_method_res_type(mt, i)))
  );
}

/**
 * Show return number of results
 */
static void show_return_nres(ir_graph *irg, ir_node *n, type *mt)
{
  entity *ent = get_irg_entity(irg);

  show_entity_failure(n);
  fprintf(stderr, "  Return node %ld in entity \"%s\" has %d results different from type %d\n",
    get_irn_node_nr(n), get_entity_name(ent),
    get_Return_n_ress(n), get_method_n_ress(mt));
}

/**
 * Show Phi input
 */
static void show_phi_failure(ir_node *phi, ir_node *pred, int pos)
{
  show_entity_failure(phi);
  fprintf(stderr, "  Phi node %ld has mode %s different from predeccessor node %ld mode %s\n",
    get_irn_node_nr(phi), get_mode_name_ex(get_irn_mode(phi)),
    get_irn_node_nr(pred), get_mode_name_ex(get_irn_mode(pred)));
}

/**
 * Show Phi inputs
 */
static void show_phi_inputs(ir_node *phi, ir_node *block)
{
  show_entity_failure(phi);
  fprintf(stderr, "  Phi node %ld has %d inputs, its Block %ld has %d\n",
    get_irn_node_nr(phi),   get_irn_arity(phi),
    get_irn_node_nr(block), get_irn_arity(block));
}

/** If the address is Sel or SymConst, return the entity. */
static entity *get_ptr_entity(ir_node *ptr) {
  if (get_irn_op(ptr) == op_Sel) {
    return get_Sel_entity(ptr);
  } else if ((get_irn_op(ptr) == op_SymConst) && (get_SymConst_kind(ptr) == symconst_addr_ent)) {
    return get_SymConst_entity(ptr);
  }
  return NULL;
}

/**
 * verify a Proj(Start) node
 */
static int verify_node_Proj_Start(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    (
     (proj == pn_Start_X_initial_exec && mode == mode_X) ||
     (proj == pn_Start_M         && mode == mode_M) ||
     (proj == pn_Start_P_frame_base && mode_is_reference(mode)) ||
     (proj == pn_Start_P_globals && mode_is_reference(mode)) ||
     (proj == pn_Start_T_args    && mode == mode_T) ||
     (proj == pn_Start_P_value_arg_base && mode_is_reference(mode)) ||
     (proj == pn_Start_P_value_arg_base && mode == mode_T)    /* FIXME: only one of those */
    ),
    "wrong Proj from Start", 0,
    show_proj_failure(p);
  );
  return 1;
}

/**
 * verify a Proj(Cond) node
 */
static int verify_node_Proj_Cond(ir_node *pred, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    (
      (proj >= 0 && mode == mode_X && get_irn_mode(get_Cond_selector(pred)) == mode_b) ||   /* compare */
      (mode == mode_X && mode_is_int(get_irn_mode(get_Cond_selector(pred)))) ||             /* switch */
      is_Bad(get_Cond_selector(pred))                                                       /* rare */
    ),
    "wrong Proj from Cond", 0,
    show_proj_failure(p);
  );
  return 1;
}

/**
 * verify a Proj(Raise) node
 */
static int verify_node_Proj_Raise(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_Raise_X && mode == mode_X) || (proj == pn_Raise_M && mode == mode_M)),
    "wrong Proj from Raise", 0,
    show_proj_failure(p);
  );
  return 1;
}

/**
 * verify a Proj(InstOf) node
 */
static int verify_node_Proj_InstOf(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    (proj >= 0 && mode == mode_X),
    "wrong Proj from InstOf", 0,
    show_proj_failure(p);
  );
  return 1;
}

/**
 * verify a Proj(Call) node
 */
static int verify_node_Proj_Call(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_Call_M_regular        && mode == mode_M) ||
     (proj == pn_Call_X_except         && mode == mode_X) ||
     (proj == pn_Call_T_result         && mode == mode_T) ||
     (proj == pn_Call_M_except         && mode == mode_M) ||
     (proj == pn_Call_P_value_res_base && mode == mode_P)),
    "wrong Proj from Call", 0,
    show_proj_failure(p);
  );
  if (proj == pn_Call_X_except)
    ASSERT_AND_RET(
      get_irn_op(get_Call_mem(n)) != op_NoMem,
      "Exception Proj from FunctionCall", 0);
  else if (proj == pn_Call_M_regular || proj == pn_Call_M_except)
    ASSERT_AND_RET(
      (get_irn_op(get_Call_mem(n)) != op_NoMem || 1),
      "Memory Proj from FunctionCall", 0);
  return 1;
}

/**
 * verify a Proj(Quot) node
 */
static int verify_node_Proj_Quot(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_Quot_M        && mode == mode_M) ||
     (proj == pn_Quot_X_except && mode == mode_X) ||
     (proj == pn_Quot_res      && mode_is_float(mode))),
    "wrong Proj from Quot", 0,
    show_proj_failure(p);
  );
  if (proj == pn_Quot_X_except)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Exception Proj from unpinned Quot", 0);
  else if (proj == pn_Quot_M)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Memory Proj from unpinned Quot", 0);
  return 1;
}

/**
 * verify a Proj(DivMod) node
 */
static int verify_node_Proj_DivMod(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_DivMod_M        && mode == mode_M) ||
     (proj == pn_DivMod_X_except && mode == mode_X) ||
     (proj == pn_DivMod_res_div  && mode_is_int(mode)) ||
     (proj == pn_DivMod_res_mod  && mode_is_int(mode))),
    "wrong Proj from DivMod", 0,
    show_proj_failure(p);
  );
  if (proj == pn_DivMod_X_except)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Exception Proj from unpinned DivMod", 0);
  else if (proj == pn_DivMod_M)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Memory Proj from unpinned DivMod", 0);
  return 1;
}

/**
 * verify a Proj(Div) node
 */
static int verify_node_Proj_Div(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_Div_M        && mode == mode_M) ||
     (proj == pn_Div_X_except && mode == mode_X) ||
     (proj == pn_Div_res      && mode_is_int(mode))),
    "wrong Proj from Div", 0,
    show_proj_failure(p);
  );
  if (proj == pn_Div_X_except)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Exception Proj from unpinned Div", 0);
  else if (proj == pn_Div_M)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Memory Proj from unpinned Div", 0);
  return 1;
}

/**
 * verify a Proj(Mod) node
 */
static int verify_node_Proj_Mod(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_Mod_M        && mode == mode_M) ||
     (proj == pn_Mod_X_except && mode == mode_X) ||
     (proj == pn_Mod_res      && mode_is_int(mode))),
    "wrong Proj from Mod", 0,
    show_proj_failure(p);
  );
  if (proj == pn_Mod_X_except)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Exception Proj from unpinned Mod", 0);
  else if (proj == pn_Mod_M)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Memory Proj from unpinned Div", 0);
  return 1;
}

/**
 * verify a Proj(Cmp) node
 */
static int verify_node_Proj_Cmp(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    (proj >= 0 && proj <= 15 && mode == mode_b),
    "wrong Proj from Cmp", 0,
    show_proj_failure(p);
  );
  return 1;
}

/**
 * verify a Proj(Load) node
 */
static int verify_node_Proj_Load(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  if (proj == pn_Load_res) {
    ir_node *ptr = get_Load_ptr(n);
    entity *ent = get_ptr_entity(ptr);

    if (vrfy_entities && ent && get_irg_phase_state(current_ir_graph) == phase_high) {
      /* do NOT check this for lowered phases, see comment on Store */
      ASSERT_AND_RET_DBG(
        (mode == get_type_mode(get_entity_type(ent))),
        "wrong data Proj from Load, entity type_mode failed", 0,
        show_proj_failure_ent(p, ent);
      );
    }
    else {
      ASSERT_AND_RET_DBG(
        mode_is_data(mode) && mode == get_Load_mode(n),
        "wrong data Proj from Load", 0,
        show_proj_failure(p);
      );
    }
  }
  else {
    ASSERT_AND_RET_DBG(
      ((proj == pn_Load_M        && mode == mode_M) ||
       (proj == pn_Load_X_except && mode == mode_X)),
      "wrong Proj from Load", 0,
      show_proj_failure(p);
    );
  }
  if (proj == pn_Load_X_except)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Exception Proj from unpinned Load", 0);
  return 1;
}

/**
 * verify a Proj(Store) node
 */
static int verify_node_Proj_Store(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    ((proj == pn_Store_M        && mode == mode_M) ||
     (proj == pn_Store_X_except && mode == mode_X)),
    "wrong Proj from Store", 0,
    show_proj_failure(p);
  );
  if (proj == pn_Store_X_except)
    ASSERT_AND_RET(
      get_irn_pinned(n) == op_pin_state_pinned,
      "Exception Proj from unpinned Store", 0);
  return 1;
}

/**
 * verify a Proj(Alloc) node
 */
static int verify_node_Proj_Alloc(ir_node *n, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);

  ASSERT_AND_RET_DBG(
    (
     (proj == pn_Alloc_M        && mode == mode_M) ||
     (proj == pn_Alloc_X_except /* && mode == mode_X*/) ||
     (proj == pn_Alloc_res      && mode_is_reference(mode))
    ),
    "wrong Proj from Alloc", 0,
    show_proj_failure(p);
  );
  return 1;
}

/**
 * verify a Proj(Proj) node
 */
static int verify_node_Proj_Proj(ir_node *pred, ir_node *p) {
  ir_mode *mode = get_irn_mode(p);
  long proj     = get_Proj_proj(p);
  long nr       = get_Proj_proj(pred);
  type *mt; /* A method type */

  pred = skip_Id(get_Proj_pred(pred));
  ASSERT_AND_RET((get_irn_mode(pred) == mode_T), "Proj from something not a tuple", 0);

  switch (get_irn_opcode(pred)) {
    case iro_Start:
      mt = get_entity_type(get_irg_entity(get_irn_irg(pred)));

      if (nr == pn_Start_T_args) {
        ASSERT_AND_RET(
          (proj >= 0 && mode_is_data(mode)),
          "wrong Proj from Proj from Start", 0);
        ASSERT_AND_RET(
          (proj < get_method_n_params(mt)),
          "More Projs for args than args in type", 0
        );
        if ((mode_is_reference(mode)) && is_compound_type(get_method_param_type(mt, proj)))
          /* value argument */ break;

        ASSERT_AND_RET_DBG(
          (mode == get_type_mode(get_method_param_type(mt, proj))),
          "Mode of Proj from Start doesn't match mode of param type.", 0,
          show_proj_mode_failure(p, get_method_param_type(mt, proj));
        );
      }
      else if (nr == pn_Start_P_value_arg_base) {
        ASSERT_AND_RET(
          (proj >= 0 && mode_is_reference(mode)),
          "wrong Proj from Proj from Start", 0
        );
        ASSERT_AND_RET(
          (proj < get_method_n_params(mt)),
          "More Projs for args than args in type", 0
        );
      }
      break;

    case iro_Call:
      {
        ASSERT_AND_RET(
          (proj >= 0 && mode_is_data(mode)),
          "wrong Proj from Proj from Call", 0);
        mt = get_Call_type(pred);
        ASSERT_AND_RET(
          (proj < get_method_n_ress(mt)),
          "More Projs for results than results in type.", 0);
        if ((mode_is_reference(mode)) && is_compound_type(get_method_res_type(mt, proj)))
          /* value result */ break;

        ASSERT_AND_RET(
          (mode == get_type_mode(get_method_res_type(mt, proj))),
          "Mode of Proj from Call doesn't match mode of result type.", 0);
      }
      break;

    case iro_Tuple:
      /* We don't test */
      break;

    case iro_Bad:
      /* hmm, optimization did not remove it */
      break;

    default:
      ASSERT_AND_RET(0, "Unknown opcode", 0);
  }
  return 1;
}

/**
 * verify a Proj(Tuple) node
 */
static int verify_node_Proj_Tuple(ir_node *n, ir_node *p) {
  /* We don't test */
  return 1;
}

/**
 * verify a Proj(CallBegin) node
 */
static int verify_node_Proj_CallBegin(ir_node *n, ir_node *p) {
  return 1;
}

/**
 * verify a Proj(EndReg) node
 */
static int verify_node_Proj_EndReg(ir_node *n, ir_node *p) {
  ASSERT_AND_RET((get_irp_ip_view_state() != ip_view_no),
                  "EndReg may only appear if ip view is constructed.", 0);
  return 1;
}

/**
 * verify a Proj(EndExcept) node
 */
static int verify_node_Proj_EndExcept(ir_node *n, ir_node *p) {
  ASSERT_AND_RET((get_irp_ip_view_state() != ip_view_no),
                  "EndExcept may only appear if ip view is constructed.", 0);
  return 1;
}

/**
 * verify a Proj node
 */
static int
verify_node_Proj(ir_node *p, ir_graph *irg) {
  ir_node *pred;
  ir_op *op;

  pred = skip_Id(get_Proj_pred(p));
  ASSERT_AND_RET(get_irn_mode(pred) == mode_T, "mode of a 'projed' node is not Tuple", 0);

  op = get_irn_op(pred);

  if (op->verify_proj_node)
    return op->verify_proj_node(pred, p);

  /* all went ok */
  return 1;
}

/**
 * verify a Block node
 */
static int verify_node_Block(ir_node *n, ir_graph *irg) {
  int i;

  for (i = get_Block_n_cfgpreds(n) - 1; i >= 0; --i) {
    ir_node *pred =  get_Block_cfgpred(n, i);
    ASSERT_AND_RET(
      (is_Bad(pred)     ||
       is_Unknown(pred) ||
       (get_irn_mode(pred) == mode_X)
      ), "Block node", 0);
  }

  /*  End block may only have Return, Raise or fragile ops as preds. */
  if (n == get_irg_end_block(irg))
    for (i = get_Block_n_cfgpreds(n) - 1; i >= 0; --i) {
      ir_node *pred =  skip_Proj(get_Block_cfgpred(n, i));
      if (is_Proj(pred) || get_irn_op(pred) == op_Tuple)
        break;   /*  We can not test properly.  How many tuples are there? */
      ASSERT_AND_RET(((get_irn_op(pred) == op_Return) ||
                      is_Bad(pred)                    ||
                      (get_irn_op(pred) == op_Raise)  ||
                      is_fragile_op(pred)               ),
                     "End Block node", 0);
    }
  /*  irg attr must == graph we are in. */
  if (! get_interprocedural_view()) {
    ASSERT_AND_RET(((get_irn_irg(n) && get_irn_irg(n) == irg)), "Block node has wrong irg attribute", 0);
  }
  return 1;
}

/**
 * verify a Start node
 */
static int verify_node_Start(ir_node *n, ir_graph *irg) {
  ir_mode *mymode = get_irn_mode(n);

  ASSERT_AND_RET(
    /* Start: BB --> X x M x ref x data1 x ... x datan x ref */
    mymode == mode_T, "Start node", 0
  );
  return 1;
}

/**
 * verify a Jmp node
 */
static int verify_node_Jmp(ir_node *n, ir_graph *irg) {
  ir_mode *mymode = get_irn_mode(n);

  ASSERT_AND_RET(
    /* Jmp: BB --> X */
    mymode == mode_X, "Jmp node", 0
  );
  return 1;
}

/**
 * verify an IJmp node
 */
static int verify_node_IJmp(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_IJmp_target(n));

  ASSERT_AND_RET(
    /* IJmp: BB x ref --> X */
    mymode == mode_X && mode_is_reference(op1mode), "IJmp node", 0
  );
  return 1;
}

/**
 * verify a Break node
 */
static int verify_node_Break(ir_node *n, ir_graph *irg) {
  ir_mode *mymode = get_irn_mode(n);

  ASSERT_AND_RET((get_irp_ip_view_state() != ip_view_no),
                  "Break may only appear if ip view is constructed.", 0);
  ASSERT_AND_RET(
    /* Jmp: BB --> X */
    mymode == mode_X, "Break node", 0
  );
  return 1;
}

/**
 * verify a Cond node
 */
static int verify_node_Cond(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Cond_selector(n));

  ASSERT_AND_RET(
    /* Cond: BB x b --> X x X */
    (op1mode == mode_b ||
    /* Cond: BB x int --> X^n */
    mode_is_int(op1mode) ),  "Cond node", 0
  );
  ASSERT_AND_RET(mymode == mode_T, "Cond mode is not a tuple", 0);

  if (op1mode == mode_b && get_irg_outs_state(irg) == outs_consistent) {
    /* we have consistent outs, check for the right number of Proj's */
    ASSERT_AND_RET(
      get_irn_n_outs(n) == 2,
      "BinaryCond node must have 2 successors", 0);
  }
  return 1;
}

/**
 * verify a Return node
 */
static int verify_node_Return(ir_node *n, ir_graph *irg) {
  int i;
  ir_mode *mymode   = get_irn_mode(n);
  ir_mode *mem_mode = get_irn_mode(get_Return_mem(n));
  type *mt;

  /* Return: BB x M x data1 x ... x datan --> X */

  ASSERT_AND_RET( mem_mode == mode_M, "Return node", 0 );  /* operand M */

  for (i = get_Return_n_ress(n) - 1; i >= 0; --i) {
    ASSERT_AND_RET( mode_is_data(get_irn_mode(get_Return_res(n, i))), "Return node", 0 );  /* operand datai */
  }
  ASSERT_AND_RET( mymode == mode_X, "Result X", 0 );   /* result X */
  /* Compare returned results with result types of method type */
  mt = get_entity_type(get_irg_entity(irg));
  ASSERT_AND_RET_DBG( get_Return_n_ress(n) == get_method_n_ress(mt),
    "Number of results for Return doesn't match number of results in type.", 0,
  show_return_nres(irg, n, mt););
  for (i = get_Return_n_ress(n) - 1; i >= 0; --i) {
    type *res_type = get_method_res_type(mt, i);

    if (is_atomic_type(res_type)) {
      ASSERT_AND_RET_DBG(
        get_irn_mode(get_Return_res(n, i)) == get_type_mode(res_type),
        "Mode of result for Return doesn't match mode of result type.", 0,
        show_return_modes(irg, n, mt, i);
      );
    }
    else {
      ASSERT_AND_RET_DBG(
        mode_is_reference(get_irn_mode(get_Return_res(n, i))),
        "Mode of result for Return doesn't match mode of result type.", 0,
        show_return_modes(irg, n, mt, i);
      );
    }
  }
  return 1;
}

/**
 * verify a Raise node
 */
static int verify_node_Raise(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Raise_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Raise_exo_ptr(n));

  ASSERT_AND_RET(
    /* Sel: BB x M x ref --> X x M */
    op1mode == mode_M && mode_is_reference(op2mode) &&
    mymode == mode_T, "Raise node", 0
  );
  return 1;
}

/**
 * verify a Const node
 */
static int verify_node_Const(ir_node *n, ir_graph *irg) {
  ir_mode *mymode = get_irn_mode(n);

  ASSERT_AND_RET(
    /* Const: BB --> data */
    (mode_is_data(mymode) ||
    mymode == mode_b)      /* we want boolean constants for static evaluation */
    ,"Const node", 0       /* of Cmp. */
  );
  return 1;
}

/**
 * verify a SymConst node
 */
static int verify_node_SymConst(ir_node *n, ir_graph *irg) {
  ir_mode *mymode = get_irn_mode(n);

  if (get_SymConst_kind(n) == symconst_addr_ent) {
    entity *ent = get_SymConst_entity(n);
    if (is_Method_type(get_entity_type(ent)) &&
        get_irn_irg(n) != get_const_code_irg()) {
#if 1
      ASSERT_AND_RET((get_entity_peculiarity(ent) != peculiarity_description),
                     "A constant must address an existing method.", 0);
#endif
    }
  }
  ASSERT_AND_RET(
    /* SymConst: BB --> int*/
    (mode_is_int(mymode) ||
    /* SymConst: BB --> ref */
    mode_is_reference(mymode))
    ,"SymConst node", 0);
  return 1;
}

/**
 * verify a Sel node
 */
static int verify_node_Sel(ir_node *n, ir_graph *irg) {
  int i;
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Sel_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Sel_ptr(n));
  entity *ent;

  ASSERT_AND_RET_DBG(
    /* Sel: BB x M x ref x int^n --> ref */
    (op1mode == mode_M && op2mode == mymode && mode_is_reference(mymode)),
    "Sel node", 0, show_node_failure(n)
  );

  for (i = get_Sel_n_indexs(n) - 1; i >= 0; --i) {
    ASSERT_AND_RET_DBG(mode_is_int(get_irn_mode(get_Sel_index(n, i))), "Sel node", 0, show_node_failure(n));
  }
  ent = get_Sel_entity(n);
  ASSERT_AND_RET_DBG(ent, "Sel node with empty entity", 0, show_node_failure(n));
  return 1;
}

/**
 * verify an InstOf node
 */
static int verify_node_InstOf(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_InstOf_obj(n));

  ASSERT_AND_RET(mode_T == mymode, "mode of Instof is not a tuple", 0);
  ASSERT_AND_RET(mode_is_data(op1mode), "Instof not on data", 0);
  return 1;
}

/**
 * verify a Call node
 */
static int verify_node_Call(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Call_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Call_ptr(n));
  type *mt;
  int i;

  /* Call: BB x M x ref x data1 x ... x datan
     --> M x datan+1 x ... x data n+m */
  ASSERT_AND_RET( op1mode == mode_M && mode_is_reference(op2mode), "Call node", 0 );  /* operand M x ref */

  /* NoMem nodes are only allowed as memory input if the Call is NOT pinned */
  ASSERT_AND_RET(
    (get_irn_op(get_Call_mem(n)) == op_NoMem) ||
    (get_irn_op(get_Call_mem(n)) != op_NoMem && get_irn_pinned(n) == op_pin_state_pinned),
    "Call node with wrong memory input", 0 );

  mt = get_Call_type(n);
  if(get_unknown_type() == mt) {
    return 1;
  }

  for (i = get_Call_n_params(n) - 1; i >= 0; --i) {
    ASSERT_AND_RET( mode_is_data(get_irn_mode(get_Call_param(n, i))), "Call node", 0 );  /* operand datai */
  }

  ASSERT_AND_RET( mymode == mode_T, "Call result not a tuple", 0 );   /* result T */
  /* Compare arguments of node with those of type */

  if (get_method_variadicity(mt) == variadicity_variadic) {
    ASSERT_AND_RET_DBG(
                       get_Call_n_params(n) >= get_method_n_params(mt),
                       "Number of args for Call doesn't match number of args in variadic type.",
                       0,
                       fprintf(stderr, "Call has %d params, method %s type %d\n",
                               get_Call_n_params(n), get_type_name(mt), get_method_n_params(mt));
                       );
  }
  else {
    ASSERT_AND_RET(
                   get_Call_n_params(n) == get_method_n_params(mt),
                   "Number of args for Call doesn't match number of args in non variadic type.",
                   0);
  }

  for (i = 0; i < get_method_n_params(mt); i++) {
    type *t = get_method_param_type(mt, i);

    if (is_atomic_type(t)) {
      ASSERT_AND_RET_DBG(
                         get_irn_mode(get_Call_param(n, i)) == get_type_mode(t),
                         "Mode of arg for Call doesn't match mode of arg type.", 0,
                         show_call_param(n, mt);
                         );
    }
    else {
      /* call with a compound type, mode must be reference */
      ASSERT_AND_RET_DBG(
                         mode_is_reference(get_irn_mode(get_Call_param(n, i))),
                         "Mode of arg for Call doesn't match mode of arg type.", 0,
                         show_call_param(n, mt);
                         );
    }
  }

#if 0
  if (Call_has_callees(n)) {
    for (i = 0; i < get_Call_n_callees(n); i++) {
      ASSERT_AND_RET(is_entity(get_Call_callee(n, i)), "callee array must contain entities.", 0);
    }
  }
#endif
  return 1;
}

/**
 * verify an Add node
 */
static int verify_node_Add(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Add_left(n));
  ir_mode *op2mode = get_irn_mode(get_Add_right(n));

  ASSERT_AND_RET_DBG(
    (
      /* common Add: BB x numP x numP --> numP */
      (op1mode == mymode && op2mode == op1mode && mode_is_numP(mymode)) ||
      /* Pointer Add: BB x ref x int --> ref */
      (mode_is_reference(op1mode) && mode_is_int(op2mode) && op1mode == mymode) ||
      /* Pointer Add: BB x int x ref --> ref */
      (mode_is_int(op1mode) && op2mode == mymode && mode_is_reference(mymode))
    ),
    "Add node", 0,
    show_binop_failure(n, "/* common Add: BB x numP x numP --> numP */ |\n"
                      "/* Pointer Add: BB x ref x int --> ref */   |\n"
                      "/* Pointer Add: BB x int x ref --> ref */");
  );
  return 1;
}

/**
 * verify a Sub node
 */
static int verify_node_Sub(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Sub_left(n));
  ir_mode *op2mode = get_irn_mode(get_Sub_right(n));

  ASSERT_AND_RET_DBG(
    /* common Sub: BB x numP x numP --> numP */
    ((mymode ==op1mode && mymode == op2mode && mode_is_numP(op1mode)) ||
    /* Pointer Sub: BB x ref x int --> ref */
    (op1mode == mymode && mode_is_int(op2mode) && mode_is_reference(mymode)) ||
    /* Pointer Sub: BB x int x ref --> ref */
    (mode_is_int(op1mode) && op2mode == mymode && mode_is_reference(mymode)) ||
    /* Pointer Sub: BB x ref x ref --> int */
    (op1mode == op2mode && mode_is_reference(op2mode) && mode_is_int(mymode))),
    "Sub node", 0,
    show_binop_failure(n, "/* common Sub: BB x numP x numP --> numP */ |\n"
                      "/* Pointer Sub: BB x ref x int --> ref */   |\n"
                      "/* Pointer Sub: BB x int x ref --> ref */   |\n"
                      "/* Pointer Sub: BB x ref x ref --> int */" );
  );
  return 1;
}

/**
 * verify a Minus node
 */
static int verify_node_Minus(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Minus_op(n));

  ASSERT_AND_RET_DBG(
    /* Minus: BB x num --> num */
    op1mode == mymode && mode_is_num(op1mode), "Minus node", 0,
    show_unop_failure(n , "/* Minus: BB x num --> num */");
  );
  return 1;
}

/**
 * verify a Mul node
 */
static int verify_node_Mul(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Mul_left(n));
  ir_mode *op2mode = get_irn_mode(get_Mul_right(n));

  ASSERT_AND_RET_DBG(
    /* Mul: BB x int1 x int1 --> int2 */
    ((mode_is_int(op1mode)   && op2mode == op1mode && mode_is_int(mymode)) ||
    /* Mul: BB x float x float --> float */
    (mode_is_float(op1mode) && op2mode == op1mode && mymode == op1mode)),
    "Mul node",0,
    show_binop_failure(n, "/* Mul: BB x int1 x int1 --> int2 */ |\n"
                         "/* Mul: BB x float x float --> float */");
  );
  return 1;
}

/**
 * verify a Quot node
 */
static int verify_node_Quot(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Quot_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Quot_left(n));
  ir_mode *op3mode = get_irn_mode(get_Quot_right(n));

  ASSERT_AND_RET_DBG(
    /* Quot: BB x M x float x float --> M x X x float */
    op1mode == mode_M && op2mode == op3mode &&
    get_mode_sort(op2mode) == irms_float_number &&
    mymode == mode_T,
    "Quot node",0,
    show_binop_failure(n, "/* Quot: BB x M x float x float --> M x X x float */");
  );
  return 1;
}

/**
 * verify a DivMod node
 */
static int verify_node_DivMod(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_DivMod_mem(n));
  ir_mode *op2mode = get_irn_mode(get_DivMod_left(n));
  ir_mode *op3mode = get_irn_mode(get_DivMod_right(n));

  ASSERT_AND_RET(
    /* DivMod: BB x M x int x int --> M x X x int x int */
    op1mode == mode_M &&
    mode_is_int(op2mode) &&
    op3mode == op2mode &&
    mymode == mode_T,
    "DivMod node", 0
  );
  return 1;
}

/**
 * verify a Div node
 */
static int verify_node_Div(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Div_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Div_left(n));
  ir_mode *op3mode = get_irn_mode(get_Div_right(n));

  ASSERT_AND_RET(
    /* Div: BB x M x int x int --> M x X x int */
    op1mode == mode_M &&
    op2mode == op3mode &&
    mode_is_int(op2mode) &&
    mymode == mode_T,
    "Div node", 0
  );
  return 1;
}

/**
 * verify a Mod node
 */
static int verify_node_Mod(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Mod_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Mod_left(n));
  ir_mode *op3mode = get_irn_mode(get_Mod_right(n));

  ASSERT_AND_RET(
    /* Mod: BB x M x int x int --> M x X x int */
    op1mode == mode_M &&
    op2mode == op3mode &&
    mode_is_int(op2mode) &&
    mymode == mode_T,
    "Mod node", 0
  );
  return 1;
}

/**
 * verify an Abs node
 */
static int verify_node_Abs(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Abs_op(n));

  ASSERT_AND_RET_DBG(
    /* Abs: BB x num --> num */
    op1mode == mymode &&
    mode_is_num (op1mode),
    "Abs node", 0,
    show_unop_failure(n, "/* Abs: BB x num --> num */");
  );
  return 1;
}

/**
 * verify a logical And, Or, Eor node
 */
static int verify_node_Logic(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_binop_left(n));
  ir_mode *op2mode = get_irn_mode(get_binop_right(n));

  ASSERT_AND_RET_DBG(
    /* And or Or or Eor: BB x int x int --> int */
    mode_is_int(mymode) &&
    op2mode == op1mode &&
    mymode == op2mode,
    "And, Or or Eor node", 0,
    show_binop_failure(n, "/* And or Or or Eor: BB x int x int --> int */");
  );
  return 1;
}

#define verify_node_And   verify_node_Logic
#define verify_node_Or    verify_node_Logic
#define verify_node_Eor   verify_node_Logic

/**
 * verify a Not node
 */
static int verify_node_Not(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Not_op(n));

  ASSERT_AND_RET_DBG(
    /* Not: BB x int --> int */
    mode_is_int(mymode) &&
    mymode == op1mode,
    "Not node", 0,
    show_unop_failure(n, "/* Not: BB x int --> int */");
  );
  return 1;
}

/**
 * verify a Cmp node
 */
static int verify_node_Cmp(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Cmp_left(n));
  ir_mode *op2mode = get_irn_mode(get_Cmp_right(n));

  ASSERT_AND_RET_DBG(
    /* Cmp: BB x datab x datab --> b16 */
    mode_is_data (op1mode) &&
    op2mode == op1mode &&
    mymode == mode_T,
    "Cmp node", 0,
    show_binop_failure(n, "/* Cmp: BB x datab x datab --> b16 */");
  );
  return 1;
}

/**
 * verify a Shift node
 */
static int verify_node_Shift(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_binop_left(n));
  ir_mode *op2mode = get_irn_mode(get_binop_right(n));

  ASSERT_AND_RET_DBG(
    /* Shl, Shr or Shrs: BB x int x int_u --> int */
    mode_is_int(op1mode) &&
    mode_is_int(op2mode) &&
    !mode_is_signed(op2mode) &&
    mymode == op1mode,
    "Shl, Shr or Shrs node", 0,
    show_binop_failure(n, "/* Shl, Shr or Shrs: BB x int x int_u --> int */");
  );
  return 1;
}

#define verify_node_Shl   verify_node_Shift
#define verify_node_Shr   verify_node_Shift
#define verify_node_Shrs  verify_node_Shift

/**
 * verify a Rot node
 */
static int verify_node_Rot(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Rot_left(n));
  ir_mode *op2mode = get_irn_mode(get_Rot_right(n));

  ASSERT_AND_RET_DBG(
    /* Rot: BB x int x int --> int */
    mode_is_int(op1mode) &&
    mode_is_int(op2mode) &&
    mymode == op1mode,
    "Rot node", 0,
    show_binop_failure(n, "/* Rot: BB x int x int --> int */");
  );
  return 1;
}

/**
 * verify a Conv node
 */
static int verify_node_Conv(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Conv_op(n));

  ASSERT_AND_RET_DBG(
    /* Conv: BB x datab1 --> datab2 */
    mode_is_datab(op1mode) && mode_is_data(mymode),
    "Conv node", 0,
    show_unop_failure(n, "/* Conv: BB x datab1 --> datab2 */");
  );
  return 1;
}

/**
 * verify a Cast node
 */
static int verify_node_Cast(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Cast_op(n));

  ASSERT_AND_RET_DBG(
    /* Conv: BB x datab1 --> datab2 */
    mode_is_data(op1mode) && op1mode == mymode,
    "Cast node", 0,
    show_unop_failure(n, "/* Conv: BB x datab1 --> datab2 */");
  );
  return 1;
}

/**
 * verify a Phi node
 */
static int verify_node_Phi(ir_node *n, ir_graph *irg) {
  ir_mode *mymode = get_irn_mode(n);
  ir_node *block  = get_nodes_block(n);
  int i;

  if (! is_Bad(block) && get_irg_phase_state(get_irn_irg(n)) != phase_building) {
    /* a Phi node MUST have the same number of inputs as its block */
    ASSERT_AND_RET_DBG(
      get_irn_arity(n) == get_irn_arity(block),
      "wrong number of inputs in Phi node", 0,
      show_phi_inputs(n, block);
    );
  }

  /* Phi: BB x dataM^n --> dataM */
  for (i = get_irn_arity(n) - 1; i >= 0; --i) {
    ir_node *pred = get_irn_n(n, i);
    if (!is_Bad(pred) && (get_irn_op(pred) != op_Unknown))
      ASSERT_AND_RET_DBG(
        get_irn_mode(pred) == mymode,
        "Phi node", 0,
        show_phi_failure(n, pred, i);
      );
  }
  ASSERT_AND_RET( mode_is_dataM(mymode), "Phi node", 0 );
  return 1;
}

/**
 * verify a Filter node
 */
static int verify_node_Filter(ir_node *n, ir_graph *irg) {
  ASSERT_AND_RET((get_irp_ip_view_state() != ip_view_no),
                "Filter may only appear if ip view is constructed.", 0);
  /* We should further do tests as for Proj and Phi. */
  return 1;
}

/**
 * verify a Load node
 */
static int verify_node_Load(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Load_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Load_ptr(n));

  ASSERT_AND_RET(
    /* Load: BB x M x ref --> M x X x data */
    op1mode == mode_M && mode_is_reference(op2mode),
    "Load node", 0
  );
  ASSERT_AND_RET( mymode == mode_T, "Load node", 0 );

  /*
   * jack's gen_add_firm_code:simpleSel seems to build Load (Load
   * (Proj (Proj))) sometimes ...

   * interprete.c:ai_eval seems to assume that this happens, too

   * obset.c:get_abstval_any can't deal with this if the load has
   * mode_T
   *
  {
    entity *ent = hunt_for_entity (get_Load_ptr (n), n);
    assert ((NULL != ent) || (mymode != mode_T));
  }
  */

  return 1;
}

/**
 * verify a Store node
 */
static int verify_node_Store(ir_node *n, ir_graph *irg) {
  entity *target;

  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Store_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Store_ptr(n));
  ir_mode *op3mode = get_irn_mode(get_Store_value(n));

  ASSERT_AND_RET(
    /* Store: BB x M x ref x data --> M x X */
    op1mode == mode_M && mode_is_reference(op2mode) && mode_is_data(op3mode),
    "Store node", 0
  );
  ASSERT_AND_RET(mymode == mode_T, "Store node", 0);

  target = get_ptr_entity(get_Store_ptr(n));
  if (vrfy_entities && target && get_irg_phase_state(current_ir_graph) == phase_high) {
    /*
     * If lowered code, any Sels that add 0 may be removed, causing
     * an direct access to entities of array or compound type.
     * Prevent this by checking the phase.
     */
    ASSERT_AND_RET( op3mode == get_type_mode(get_entity_type(target)),
                    "Store node", 0);
  }

  return 1;
}

/**
 * verify an Alloc node
 */
static int verify_node_Alloc(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Alloc_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Alloc_size(n));

  ASSERT_AND_RET_DBG(
    /* Alloc: BB x M x int_u --> M x X x ref */
    op1mode == mode_M &&
    mode_is_int(op2mode) &&
    !mode_is_signed(op2mode) &&
    mymode == mode_T,
    "Alloc node", 0,
    show_binop_failure(n, "/* Alloc: BB x M x int_u --> M x X x ref */");
  );
  return 1;
}

/**
 * verify a Free node
 */
static int verify_node_Free(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Free_mem(n));
  ir_mode *op2mode = get_irn_mode(get_Free_ptr(n));
  ir_mode *op3mode = get_irn_mode(get_Free_size(n));

  ASSERT_AND_RET_DBG(
    /* Free: BB x M x ref x int_u --> M */
    op1mode == mode_M && mode_is_reference(op2mode) &&
    mode_is_int(op3mode) &&
    !mode_is_signed(op3mode) &&
    mymode == mode_M,
    "Free node", 0,
    show_triop_failure(n, "/* Free: BB x M x ref x int_u --> M */");
  );
  return 1;
}

/**
 * verify a Sync node
 */
static int verify_node_Sync(ir_node *n, ir_graph *irg) {
  int i;
  ir_mode *mymode  = get_irn_mode(n);

  /* Sync: BB x M^n --> M */
  for (i = get_Sync_n_preds(n) - 1; i >= 0; --i) {
    ASSERT_AND_RET( get_irn_mode(get_Sync_pred(n, i)) == mode_M, "Sync node", 0 );
  };
  ASSERT_AND_RET( mymode == mode_M, "Sync node", 0 );
  return 1;
}

/**
 * verify a Confirm node
 */
static int verify_node_Confirm(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Confirm_value(n));
  ir_mode *op2mode = get_irn_mode(get_Confirm_bound(n));

  ASSERT_AND_RET_DBG(
    /* Confirm: BB x T x T --> T */
    op1mode == mymode &&
    op2mode == mymode,
    "Confirm node", 0,
    show_binop_failure(n, "/* Confirm: BB x T x T --> T */");
  );
  return 1;
}

/**
 * verify a Mux node
 */
static int verify_node_Mux(ir_node *n, ir_graph *irg) {
  ir_mode *mymode  = get_irn_mode(n);
  ir_mode *op1mode = get_irn_mode(get_Mux_sel(n));
  ir_mode *op2mode = get_irn_mode(get_Mux_true(n));
  ir_mode *op3mode = get_irn_mode(get_Mux_false(n));

  ASSERT_AND_RET(
    /* Mux: BB x b x numP x numP --> numP */
    op1mode == mode_b &&
    op2mode == mymode &&
    op3mode == mymode &&
    mode_is_numP(mymode),
    "Mux node", 0
  );
  return 1;
}

/*
 * Check dominance.
 * For each usage of a node, it is checked, if the block of the
 * node dominates the block of the usage (for phis: the predecessor
 * block of the phi for the corresponding edge).
 */
static int check_dominance_for_node(ir_node *use)
{
  /* This won't work for blocks and the end node */
  if (!is_Block(use) && use != get_irg_end(current_ir_graph)) {
    int i;
    ir_node *bl = get_nodes_block(use);

    for (i = get_irn_arity(use) - 1; i >= 0; --i) {
      ir_node *def    = get_irn_n(use, i);
      ir_node *def_bl = get_nodes_block(def);
      ir_node *use_bl = bl;

      /* ignore dead definition blocks, will be removed */
      if (is_Block_dead(def_bl) || get_Block_dom_depth(def_bl) == -1)
        continue;

      if (is_Phi(use))
        use_bl = get_Block_cfgpred_block(bl, i);

      /* ignore dead use blocks, will be removed */
      if (is_Block_dead(use_bl) || get_Block_dom_depth(use_bl) == -1)
        continue;

      ASSERT_AND_RET_DBG(
        block_dominates(def_bl, use_bl),
        "the definition of a value used violates the dominance property", 0,
        ir_fprintf(stderr,
                   "graph %+F: %+F of %+F must dominate %+F of user %+F input %d\n",
                   current_ir_graph, def_bl, def, use_bl, use, i
        );
      );
    }
  }
  return 1;
}

int irn_vrfy_irg(ir_node *n, ir_graph *irg)
{
  int i;
  ir_op *op;

  if (!opt_do_node_verification)
                return 1;

  if (!get_interprocedural_view()) {
    /*
     * do NOT check placement in interprocedural view, as we don't always know
     * the "right" graph ...
     */
    ASSERT_AND_RET_DBG(
      node_is_in_irgs_storage(irg, n),
      "Node is not stored on proper IR graph!", 0,
      show_node_on_graph(irg, n);
    );
    assert(get_irn_irg(n) == irg);
  }

  op = get_irn_op(n);

  /* We don't want to test nodes whose predecessors are Bad,
     as we would have to special case that for each operation. */
  if (op != op_Phi && op != op_Block)
    for (i = get_irn_arity(n) - 1; i >= 0; --i) {
      if (is_Bad(get_irn_n(n, i)))
        return 1;
    }

  if (op->verify_node)
    return op->verify_node(n, irg);

  /* All went ok */
  return 1;
}

int irn_vrfy(ir_node *n)
{
  int res = 1;
#ifdef DEBUG_libfirm
  res = irn_vrfy_irg(n, current_ir_graph);
#endif
  return res;
}

/*-----------------------------------------------------------------*/
/* Verify the whole graph.                                         */
/*-----------------------------------------------------------------*/

#ifdef DEBUG_libfirm
/**
 * Walker to check every node
 */
static void vrfy_wrap(ir_node *node, void *env) {
  int *res = env;
  *res = irn_vrfy(node);
}

/**
 * Walker to check every node including SSA property.
 * Only called if dominance info is available.
 */
static void vrfy_wrap_ssa(ir_node *node, void *env)
{
  int *res = env;

  *res = irn_vrfy(node);
  if (*res)
    *res = check_dominance_for_node(node);
}

#endif /* DEBUG_libfirm */

/*
 * Calls irn_vrfy for each node in irg.
 * Graph must be in state "op_pin_state_pinned".
 * If dominance info is available, check the SSA property.
 */
int irg_verify(ir_graph *irg, unsigned flags)
{
  int res = 1;
#ifdef DEBUG_libfirm
  ir_graph *rem;

  rem = current_ir_graph;
  current_ir_graph = irg;
  last_irg_error = NULL;

  assert(get_irg_pinned(irg) == op_pin_state_pinned);

  if (flags & VRFY_ENFORCE_SSA)
    compute_doms(irg);

  irg_walk_graph(
    irg,
    get_irg_dom_state(irg) == dom_consistent &&
    get_irg_pinned(irg) == op_pin_state_pinned ?
      vrfy_wrap_ssa : vrfy_wrap,
    NULL, &res
  );

  current_ir_graph = rem;

  if (opt_do_node_verification == NODE_VERIFICATION_REPORT && ! res) {
    entity *ent = get_irg_entity(current_ir_graph);

    if (ent)
      fprintf(stderr, "irg_verify: Verifying graph %s failed\n", get_entity_name(ent));
    else
      fprintf(stderr, "irg_verify: Verifying graph %p failed\n", (void *)current_ir_graph);
  }
#endif /* DEBUG_libfirm */

  return res;
}

int irn_vrfy_irg_dump(ir_node *n, ir_graph *irg, const char **bad_string)
{
  int res;
  node_verification_t old = opt_do_node_verification;

  firm_vrfy_failure_msg = NULL;
  opt_do_node_verification = NODE_VERIFICATION_ERROR_ONLY;
  res = irn_vrfy_irg(n, irg);
  if (! res && get_irg_dom_state(irg) == dom_consistent &&
      get_irg_pinned(irg) == op_pin_state_pinned)
    res = check_dominance_for_node(n);
  opt_do_node_verification = old;
  *bad_string = firm_vrfy_failure_msg;

  return res;
}


typedef struct _vrfy_bad_env_t {
  int flags;
  int res;
} vrfy_bad_env_t;

/**
 * Pre-Walker: check Bad predecessors of node.
 */
static void check_bads(ir_node *node, void *env)
{
  vrfy_bad_env_t *venv = env;
  int i, arity = get_irn_arity(node);

  if (is_Block(node)) {
    if ((venv->flags & BAD_CF) == 0) {

      /* check for Bad Block predecessor */
      for (i = 0; i < arity; ++i) {
        ir_node *pred = get_irn_n(node, i);

        if (is_Bad(pred)) {
          venv->res |= BAD_CF;

          if (opt_do_node_verification == NODE_VERIFICATION_REPORT) {
            fprintf(stderr, "irg_vrfy_bads: Block %ld has Bad predecessor\n", get_irn_node_nr(node));
          }
          if (opt_do_node_verification == NODE_VERIFICATION_ON) {
            assert(0 && "Bad CF detected");
          }
        }
      }
    }
  }
  else {
    if ((venv->flags & BAD_BLOCK) == 0) {

      /* check for Bad Block */
      if (is_Bad(get_nodes_block(node))) {
        venv->res |= BAD_BLOCK;

        if (opt_do_node_verification == NODE_VERIFICATION_REPORT) {
          fprintf(stderr, "irg_vrfy_bads: node %ld has Bad Block\n", get_irn_node_nr(node));
        }
        if (opt_do_node_verification == NODE_VERIFICATION_ON) {
          assert(0 && "Bad CF detected");
        }
      }
    }

    if ((venv->flags & TUPLE) == 0) {
      if (get_irn_op(node) == op_Tuple) {
        venv->res |= TUPLE;

        if (opt_do_node_verification == NODE_VERIFICATION_REPORT) {
          fprintf(stderr, "irg_vrfy_bads: node %ld is a Tuple\n", get_irn_node_nr(node));
        }
        if (opt_do_node_verification == NODE_VERIFICATION_ON) {
          assert(0 && "Tuple detected");
        }
      }
    }

    for (i = 0; i < arity; ++i) {
      ir_node *pred = get_irn_n(node, i);

      if (is_Bad(pred)) {
        /* check for Phi with Bad inputs */
        if (is_Phi(node) && !is_Bad(get_nodes_block(node)) && is_Bad(get_irn_n(get_nodes_block(node), i))) {
          if (venv->flags & BAD_CF)
            continue;
          else {
            venv->res |= BAD_CF;

            if (opt_do_node_verification == NODE_VERIFICATION_REPORT) {
              fprintf(stderr, "irg_vrfy_bads: Phi %ld has Bad Input\n", get_irn_node_nr(node));
            }
            if (opt_do_node_verification == NODE_VERIFICATION_ON) {
              assert(0 && "Bad CF detected");
            }
          }
        }

        /* Bad node input */
        if ((venv->flags & BAD_DF) == 0) {
          venv->res |= BAD_DF;

          if (opt_do_node_verification == NODE_VERIFICATION_REPORT) {
            fprintf(stderr, "irg_vrfy_bads: node %ld has Bad Input\n", get_irn_node_nr(node));
          }
          if (opt_do_node_verification == NODE_VERIFICATION_ON) {
            assert(0 && "Bad NON-CF detected");
          }
        }
      }
    }
  }
}

/*
 * verify occurance of bad nodes
 */
int irg_vrfy_bads(ir_graph *irg, int flags)
{
  vrfy_bad_env_t env;

  env.flags = flags;
  env.res   = 0;

  irg_walk_graph(irg, check_bads, NULL, &env);

  return env.res;
}

/*
 * set the default verify operation
 */
void firm_set_default_verifyer(ir_op *op)
{
#define CASE(a)                          \
   case iro_##a:                         \
     op->verify_node  = verify_node_##a; \
     break

   switch (op->code) {
   CASE(Proj);
   CASE(Block);
   CASE(Start);
   CASE(Jmp);
   CASE(IJmp);
   CASE(Break);
   CASE(Cond);
   CASE(Return);
   CASE(Raise);
   CASE(Const);
   CASE(SymConst);
   CASE(Sel);
   CASE(InstOf);
   CASE(Call);
   CASE(Add);
   CASE(Sub);
   CASE(Minus);
   CASE(Mul);
   CASE(Quot);
   CASE(DivMod);
   CASE(Div);
   CASE(Mod);
   CASE(Abs);
   CASE(And);
   CASE(Or);
   CASE(Eor);
   CASE(Not);
   CASE(Cmp);
   CASE(Shl);
   CASE(Shr);
   CASE(Shrs);
   CASE(Rot);
   CASE(Conv);
   CASE(Cast);
   CASE(Phi);
   CASE(Filter);
   CASE(Load);
   CASE(Store);
   CASE(Alloc);
   CASE(Free);
   CASE(Sync);
   CASE(Confirm);
   CASE(Mux);
   default:
     op->verify_node = NULL;
   }
#undef CASE

#define CASE(a)                          \
   case iro_##a:                         \
     op->verify_proj_node  = verify_node_Proj_##a; \
     break

   switch (op->code) {
   CASE(Start);
   CASE(Cond);
   CASE(Raise);
   CASE(InstOf);
   CASE(Call);
   CASE(Quot);
   CASE(DivMod);
   CASE(Div);
   CASE(Mod);
   CASE(Cmp);
   CASE(Load);
   CASE(Store);
   CASE(Alloc);
   CASE(Proj);
   CASE(Tuple);
   CASE(CallBegin);
   CASE(EndReg);
   CASE(EndExcept);
   default:
     op->verify_proj_node = NULL;
   }
#undef CASE
}