[libfirm] / ir / ir / irverify.c

/*
 * Copyright (C) 1995-2010 University of Karlsruhe.  All right reserved.
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

/**
 * @file
 * @brief    Check irnodes for correctness.
 * @author   Christian Schaefer, Goetz Lindenmaier, Till Riedel, Michael Beck
 * @version  $Id$
 */
#include "config.h"

#include "irprog.h"
#include "irop_t.h"
#include "irgraph_t.h"
#include "irverify_t.h"
#include "irgwalk.h"
#include "irdump.h"
#include "irdom_t.h"
#include "irprintf.h"
#include "irouts.h"
#include "irflag_t.h"
#include "irpass_t.h"

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

const char *firm_verify_failure_msg;

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

#ifndef NDEBUG

/**
 * 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);
}

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

/**
 * print the name of the entity of an verification failure
 *
 * @param node  the node caused the 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_verify_irg() <of CONST_CODE_IRG> failed\n");
        } else {
                ir_entity *ent = get_irg_entity(irg);

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

                        if (ent_type) {
                                ir_fprintf(stderr, "\nFIRM: irn_verify_irg() %+F::%s failed\n",
                                           ent_type, get_entity_name(ent));
                        } else {
                                fprintf(stderr, "\nFIRM: irn_verify_irg() <NULL>::%s failed\n", get_entity_name(ent));
                        }
                } else {
                        fprintf(stderr, "\nFIRM: irn_verify_irg() <IRG %p> failed\n", (void *)irg);
                }
        }
}

static const char *get_irn_modename(const ir_node *node)
{
        ir_mode *mode = get_irn_mode(node);
        return get_mode_name(mode);
}

/**
 * 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, ir_type *ty)
{
        long proj  = get_Proj_proj(n);
        ir_mode *m = get_type_mode(ty);
        char type_name[256];
        ir_print_type(type_name, sizeof(type_name), 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,
                type_name,
                get_mode_name_ex(m));
}

/**
 * Prints a failure message for a proj
 */
static void show_proj_failure_ent(ir_node *n, ir_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));
        char type_name[256];
        ir_print_type(type_name, sizeof(type_name), 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), type_name,
                get_mode_name_ex(m));
}

/**
 * Show a node and a graph
 */
static void show_node_on_graph(ir_graph *irg, ir_node *n)
{
        ir_fprintf(stderr, "\nFIRM: irn_verify_irg() of %+F, node %+F\n", irg, n);
}

/**
 * Show call parameters
 */
static void show_call_param(ir_node *n, ir_type *mt)
{
        size_t i;
        char type_name[256];
        ir_print_type(type_name, sizeof(type_name), mt);

        show_entity_failure(n);
        fprintf(stderr, "  Call type-check failed: %s(", type_name);
        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, ir_type *mt, int i)
{
        ir_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, ir_type *mt)
{
        ir_entity *ent = get_irg_entity(irg);

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

/**
 * Show Phi input
 */
static void show_phi_failure(ir_node *phi, ir_node *pred, int pos)
{
        (void) 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));
}

#endif /* #ifndef NDEBUG */

/**
 * If the address is Sel or SymConst, return the entity.
 *
 * @param ptr  the node representing the address
 */
static ir_entity *get_ptr_entity(ir_node *ptr)
{
        if (is_Sel(ptr)) {
                return get_Sel_entity(ptr);
        } else if (is_SymConst_addr_ent(ptr)) {
                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);
        (void) n;

        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_tls          && mode_is_reference(mode)) ||
                        (proj == pn_Start_T_args         && mode == mode_T)
                ),
                "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);
        (void) n;

        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);
        (void) n;

        ASSERT_AND_RET_DBG(
                (
                        (proj == pn_InstOf_M         && mode == mode_M) ||
                        (proj == pn_InstOf_X_regular && mode == mode_X) ||
                        (proj == pn_InstOf_X_except  && mode == mode_X) ||
                        (proj == pn_InstOf_res       && mode_is_reference(mode))
                ),
                "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                && mode == mode_M) ||
                        (proj == pn_Call_X_regular        && mode == mode_X) ||
                        (proj == pn_Call_X_except         && mode == mode_X) ||
                        (proj == pn_Call_T_result         && mode == mode_T) ||
                        (proj == pn_Call_P_value_res_base && mode_is_reference(mode))
                ),
                "wrong Proj from Call", 0,
                show_proj_failure(p);
        );
        /* if we have exception flow, we must have a real Memory input */
        if (proj == pn_Call_X_regular)
                ASSERT_AND_RET(
                        !is_NoMem(get_Call_mem(n)),
                        "Regular Proj from FunctionCall", 0);
        else if (proj == pn_Call_X_except)
                ASSERT_AND_RET(
                        !is_NoMem(get_Call_mem(n)),
                        "Exception Proj from FunctionCall", 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_regular && mode == mode_X) ||
                        (proj == pn_Div_X_except  && mode == mode_X) ||
                        (proj == pn_Div_res       && mode == get_Div_resmode(n))
                ),
                "wrong Proj from Div", 0,
                show_proj_failure(p);
        );
        if (proj == pn_Div_X_regular)
                ASSERT_AND_RET(
                        get_irn_pinned(n) == op_pin_state_pinned,
                        "Regular Proj from unpinned Div", 0);
        else 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_regular && mode == mode_X) ||
                        (proj == pn_Mod_X_except  && mode == mode_X) ||
                        (proj == pn_Mod_res       && mode == get_Mod_resmode(n))
                ),
                "wrong Proj from Mod", 0,
                show_proj_failure(p);
        );
        if (proj == pn_Mod_X_regular)
                ASSERT_AND_RET(
                        get_irn_pinned(n) == op_pin_state_pinned,
                        "Regular Proj from unpinned Mod", 0);
        else 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);
        (void) n;

        ASSERT_AND_RET_DBG(
                (proj >= 0 && proj <= 15 && mode == mode_b),
                "wrong Proj from Cmp", 0,
                show_proj_failure(p);
        );
        ASSERT_AND_RET_DBG(
                (mode_is_float(get_irn_mode(get_Cmp_left(n))) || !(proj & pn_Cmp_Uo)),
                "unordered Proj for non-float Cmp (Did you use Ne instead of Lg?)", 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);
                ir_entity *ent = get_ptr_entity(ptr);
                ir_graph  *irg = get_irn_irg(n);

                if (verify_entities && ent && get_irg_phase_state(irg) == 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_regular && mode == mode_X) ||
                                (proj == pn_Load_X_except  && mode == mode_X)
                        ),
                        "wrong Proj from Load", 0,
                        show_proj_failure(p);
                );
        }
        if (proj == pn_Load_X_regular) {
                ASSERT_AND_RET(
                        get_irn_pinned(n) == op_pin_state_pinned,
                        "Regular Proj from unpinned Load", 0);
        } else 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_regular && mode == mode_X) ||
                        (proj == pn_Store_X_except  && mode == mode_X)
                ),
                "wrong Proj from Store", 0,
                show_proj_failure(p);
        );
        if (proj == pn_Store_X_regular) {
                ASSERT_AND_RET(
                        get_irn_pinned(n) == op_pin_state_pinned,
                        "Regular Proj from unpinned Store", 0);
        } else 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);
        (void) n;

        ASSERT_AND_RET_DBG(
                (
                        (proj == pn_Alloc_M         && mode == mode_M) ||
                        (proj == pn_Alloc_X_regular && mode == mode_X) ||
                        (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);
        ir_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_datab(mode)),
                                "wrong Proj from Proj from Start", 0);
                        ASSERT_AND_RET(
                                (proj < (int)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;

                        if (get_irg_phase_state(get_irn_irg(pred)) != phase_backend) {
                                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));
                                                );
                        }
                }
                break;

        case iro_Call:
                {
                        ASSERT_AND_RET(
                                (proj >= 0 && mode_is_datab(mode)),
                                "wrong Proj from Proj from Call", 0);
                        mt = get_Call_type(pred);
                        ASSERT_AND_RET(mt == get_unknown_type() || is_Method_type(mt),
                                        "wrong call type on call", 0);
                        ASSERT_AND_RET(
                                (proj < (int)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); */
                break;
        }
        return 1;
}

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

/**
 * verify a Proj(CopyB) node
 */
static int verify_node_Proj_CopyB(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_CopyB_M         && mode == mode_M) ||
                        (proj == pn_CopyB_X_regular && mode == mode_X) ||
                        (proj == pn_CopyB_X_except  && mode == mode_X)
                ),
                "wrong Proj from CopyB", 0,
                show_proj_failure(p);
        );
        if (proj == pn_CopyB_X_regular)
                ASSERT_AND_RET(
                        get_irn_pinned(n) == op_pin_state_pinned,
                        "Regular Proj from unpinned CopyB", 0);
        else if (proj == pn_CopyB_X_except)
                ASSERT_AND_RET(
                        get_irn_pinned(n) == op_pin_state_pinned,
                        "Exception Proj from unpinned CopyB", 0);
        return 1;
}

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

        /* ignore Bound checks of Bad */
        if (is_Bad(get_Bound_index(n)))
                return 1;
        ASSERT_AND_RET_DBG(
                (
                        (proj == pn_Bound_M         && mode == mode_M) ||
                        (proj == pn_Bound_X_regular && mode == mode_X) ||
                        (proj == pn_Bound_X_except  && mode == mode_X) ||
                        (proj == pn_Bound_res       && mode == get_irn_mode(get_Bound_index(n)))
                ),
                "wrong Proj from Bound", 0,
                show_proj_failure(p);
        );
        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);
        ASSERT_AND_RET(get_irg_pinned(irg) == op_pin_state_floats || get_nodes_block(pred) == get_nodes_block(p), "Proj must be in same block as its predecessor", 0);

        op = get_irn_op(pred);

        if (op->ops.verify_proj_node)
                return op->ops.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) || (get_irn_mode(pred) == mode_X),
                        "Block node must have a mode_X predecessor", 0);
        }

        if (n == get_irg_start_block(irg)) {
                ASSERT_AND_RET(get_Block_n_cfgpreds(n) == 0, "Start Block node", 0);
        }

        if (n == get_irg_end_block(irg) && get_irg_phase_state(irg) != phase_backend)
                /* End block may only have Return, Raise or fragile ops as preds. */
                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) || is_Tuple(pred))
                                break;   /*  We can not test properly.  How many tuples are there? */
                        ASSERT_AND_RET(
                                (
                                        is_Return(pred) ||
                                        is_Bad(pred)    ||
                                        is_Raise(pred)  ||
                                        is_fragile_op(pred)
                                ),
                                "End Block node", 0);
                }
                /*  irg attr must == graph we are in. */
                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);
        (void) irg;

        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);
        (void) irg;

        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));
        (void) irg;

        ASSERT_AND_RET(
                /* IJmp: BB x ref --> X */
                mymode == mode_X && mode_is_reference(op1mode), "IJmp 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));
        (void) irg;

        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);

        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));
        ir_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_datab(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) {
                ir_type *res_type = get_method_res_type(mt, i);

                if (get_irg_phase_state(irg) != phase_backend) {
                        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));
        (void) irg;

        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);
        (void) irg;

        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. */
        );
        ASSERT_AND_RET(
                /* the modes of the constant and teh tarval must match */
                mymode == get_tarval_mode(get_Const_tarval(n)),
                "Const node, tarval and node mode mismatch", 0
        );
        return 1;
}

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

        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));
        ir_entity *ent;
        (void) irg;

        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));
        (void) irg;

        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;
}

/**
 * Check if the pinned state is right.
 */
static int verify_right_pinned(ir_node *n)
{
        ir_node *mem;

        if (get_irn_pinned(n) == op_pin_state_pinned)
                return 1;
        mem = get_Call_mem(n);

        /* if it's not pinned, its memory predecessor must be NoMem or Pin */
        if (is_NoMem(mem) || is_Pin(mem))
                return 1;
        return 0;
}

/**
 * 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));
        ir_type *mt;
        size_t i;
        size_t n_params;
        (void) irg;

        /* 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(verify_right_pinned(n),"Call node with wrong memory input", 0 );

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

        n_params = get_Call_n_params(n);
        for (i = 0; i < n_params; ++i) {
                ASSERT_AND_RET( mode_is_datab(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,
                        ir_fprintf(stderr, "Call %+F has %d params, type %d\n",
                        n, get_Call_n_params(n), get_method_n_params(mt));
                );
        } else {
                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 non variadic type.",
                        0,
                        ir_fprintf(stderr, "Call %+F has %d params, type %d\n",
                        n, get_Call_n_params(n), get_method_n_params(mt));
                );
        }

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

                if (get_irg_phase_state(irg) != phase_backend) {
                        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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                (
                        /* common Add: BB x numP x numP --> numP */
                        (op1mode == mymode && op2mode == op1mode && mode_is_data(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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                (
                        /* common Sub: BB x numP x numP --> numP */
                        (mymode ==op1mode && mymode == op2mode && mode_is_data(op1mode)) ||
                        /* Pointer Sub: BB x ref x int --> ref */
                        (op1mode == mymode && mode_is_int(op2mode) && 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 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));
        (void) irg;

        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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                (
                        /* Mul: BB x int_n x int_n --> int_n|int_2n */
                        (mode_is_int(op1mode)   && op2mode == op1mode && mode_is_int(mymode) &&
                         (op1mode == mymode || get_mode_size_bits(op1mode) * 2 == get_mode_size_bits(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 int_n x int_n --> int_n|int_2n */ |\n"
                "/* Mul: BB x float x float --> float */");
        );
        return 1;
}

/**
 * verify a Mulh node
 */
static int verify_node_Mulh(ir_node *n, ir_graph *irg)
{
        ir_mode *mymode  = get_irn_mode(n);
        ir_mode *op1mode = get_irn_mode(get_Mulh_left(n));
        ir_mode *op2mode = get_irn_mode(get_Mulh_right(n));
        (void) irg;

        ASSERT_AND_RET_DBG(
                (
                        /* Mulh: BB x int x int --> int */
                        (mode_is_int(op1mode) && op2mode == op1mode && op1mode == mymode)
                ),
                "Mulh node",0,
                show_binop_failure(n, "/* Mulh: BB x int x int --> int */");
        );
        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));
        (void) irg;

        ASSERT_AND_RET(
                /* Div: BB x M x int x int --> M x X x int */
                op1mode == mode_M &&
                op2mode == op3mode &&
                mode_is_data(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));
        (void) irg;

        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 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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                /* And or Or or Eor: BB x int x int --> int */
                (mode_is_int(mymode) || mymode == mode_b) &&
                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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                /* Not: BB x int --> int */
                (mode_is_int(mymode) || mymode == mode_b) &&
                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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                /* Cmp: BB x datab x datab --> b16 */
                mode_is_datab(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));
        (void) irg;

        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 Rotl node
 */
static int verify_node_Rotl(ir_node *n, ir_graph *irg)
{
        ir_mode *mymode  = get_irn_mode(n);
        ir_mode *op1mode = get_irn_mode(get_Rotl_left(n));
        ir_mode *op2mode = get_irn_mode(get_Rotl_right(n));
        (void) irg;

        ASSERT_AND_RET_DBG(
                /* Rotl: BB x int x int --> int */
                mode_is_int(op1mode) &&
                mode_is_int(op2mode) &&
                mymode == op1mode,
                "Rotl node", 0,
                show_binop_failure(n, "/* Rotl: 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));
        (void) irg;

        ASSERT_AND_RET_DBG(
                is_irg_state(irg, IR_GRAPH_STATE_BCONV_ALLOWED) ||
                (mode_is_datab(op1mode) && mode_is_data(mymode)),
                "Conv node", 0,
                show_unop_failure(n, "/* Conv: BB x datab --> data */");
        );
        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));
        (void) irg;

        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;
        (void) irg;

        /* a Phi node MUST have the same number of inputs as its block
         * Exception is a phi with 0 inputs which is used when (re)constructing the
         * SSA form */
        if (! is_Bad(block) && get_irg_phase_state(get_irn_irg(n)) != phase_building && get_irn_arity(n) > 0) {
                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_Phi_n_preds(n) - 1; i >= 0; --i) {
                ir_node *pred = get_Phi_pred(n, i);
                if (!is_Bad(pred)) {
                        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) || mymode == mode_b, "Phi node", 0 );

        if (mymode == mode_M) {
                for (i = get_Phi_n_preds(n) - 1; i >= 0; --i) {
                        int j;
                        ir_node *pred_i = get_Phi_pred(n, i);

                        if (is_Bad(pred_i))
                                continue;
                        for (j = i - 1; j >= 0; --j) {
                                ir_node *pred_j = get_Phi_pred(n, j);

                                if (is_Bad(pred_j))
                                        continue;
#if 0
                                /* currently this checks fails for blocks with exception
                                   outputs (and these are NOT basic blocks).  So it is disabled yet. */
                                ASSERT_AND_RET_DBG(
                                        (pred_i == pred_j) || (get_irn_n(pred_i, -1) != get_irn_n(pred_j, -1)),
                                        "At least two different PhiM predecessors are in the same block",
                                        0,
                                        ir_printf("%+F and %+F of %+F are in %+F\n", pred_i, pred_j, n, get_irn_n(pred_i, -1))
                                );
#endif
                        }
                }
        }
        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(op1mode == mode_M, "Load node", 0);
        if (get_irg_phase_state(irg) != phase_backend) {
                ASSERT_AND_RET(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
         *
          {
          ir_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)
{
        ir_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(op1mode == mode_M && mode_is_datab(op3mode), "Store node", 0 );
        if (get_irg_phase_state(irg) != phase_backend) {
                ASSERT_AND_RET(mode_is_reference(op2mode), "Store node", 0 );
        }
        ASSERT_AND_RET(mymode == mode_T, "Store node", 0);

        target = get_ptr_entity(get_Store_ptr(n));
        if (verify_entities && target && get_irg_phase_state(irg) == 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_count(n));
        (void) irg;

        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_node_failure(n);
        );
        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));
        (void) irg;

        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);
        (void) irg;

        /* 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));
        (void) irg;

        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));
        (void) irg;

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

/**
 * verify a CopyB node
 */
static int verify_node_CopyB(ir_node *n, ir_graph *irg)
{
        ir_mode *mymode  = get_irn_mode(n);
        ir_mode *op1mode = get_irn_mode(get_CopyB_mem(n));
        ir_mode *op2mode = get_irn_mode(get_CopyB_dst(n));
        ir_mode *op3mode = get_irn_mode(get_CopyB_src(n));
        ir_type *t = get_CopyB_type(n);

        /* CopyB: BB x M x ref x ref --> M x X */
        ASSERT_AND_RET(mymode == mode_T && op1mode == mode_M, "CopyB node", 0);
        if (get_irg_phase_state(irg) != phase_backend) {
                ASSERT_AND_RET(mode_is_reference(op2mode) && mode_is_reference(op3mode),
                        "CopyB node", 0 );
        }

        ASSERT_AND_RET(
                is_compound_type(t) || is_Array_type(t),
                "CopyB node should copy compound types only", 0 );

        /* NoMem nodes are only allowed as memory input if the CopyB is NOT pinned.
           This should happen RARELY, as CopyB COPIES MEMORY */
        ASSERT_AND_RET(verify_right_pinned(n), "CopyB node with wrong memory input", 0 );
        return 1;
}

/**
 * verify a Bound node
 */
static int verify_node_Bound(ir_node *n, ir_graph *irg)
{
        ir_mode *mymode  = get_irn_mode(n);
        ir_mode *op1mode = get_irn_mode(get_Bound_mem(n));
        ir_mode *op2mode = get_irn_mode(get_Bound_index(n));
        ir_mode *op3mode = get_irn_mode(get_Bound_lower(n));
        ir_mode *op4mode = get_irn_mode(get_Bound_upper(n));
        (void) irg;

        /* Bound: BB x M x int x int x int --> M x X */
        ASSERT_AND_RET(
                mymode == mode_T &&
                op1mode == mode_M &&
                op2mode == op3mode &&
                op3mode == op4mode &&
                mode_is_int(op3mode),
                "Bound 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).
 *
 * @return non-zero on success, 0 on dominance error
 */
static int check_dominance_for_node(ir_node *use)
{
        /* This won't work for blocks and the end node */
        if (!is_Block(use) && !is_End(use) && !is_Anchor(use)) {
                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;
                        ir_graph *irg;

                        /* 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;

                        irg = get_irn_irg(use);
                        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",
                                irg, def_bl, def, use_bl, use, i
                                );
                        );
                }
        }
        return 1;
}

/* Tests the modes of n and its predecessors. */
int irn_verify_irg(ir_node *n, ir_graph *irg)
{
        int i;
        ir_op *op;

        if (!get_node_verification_mode())
                return 1;

        /*
         * do NOT check placement in interprocedural view, as we don't always
         * know the "right" graph ...
         */

#ifndef NDEBUG
        /* this is an expensive check for large graphs (it has a quadratic
         * runtime but with a small constant); so do NOT run it in release mode
         */
        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);
        );
#endif
        assert(get_irn_irg(n) == irg);
        {
                unsigned idx           = get_irn_idx(n);
                ir_node *node_from_map = get_idx_irn(irg, idx);
                ASSERT_AND_RET_DBG(node_from_map == n, "Node index and index map entry differ", 0,
                        ir_printf("node %+F node in map %+F(%p)\n", n, node_from_map, node_from_map));
        }

        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 (_get_op_pinned(op) >= op_pin_state_exc_pinned) {
                op_pin_state state = get_irn_pinned(n);
                ASSERT_AND_RET_DBG(
                        state == op_pin_state_floats ||
                        state == op_pin_state_pinned,
                        "invalid pin state", 0,
                        ir_printf("node %+F", n));
        }

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

        /* All went ok */
        return 1;
}

int irn_verify(ir_node *n)
{
#ifdef DEBUG_libfirm
        return irn_verify_irg(n, get_irn_irg(n));
#else
        (void)n;
        return 1;
#endif
}

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

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

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

        *res = irn_verify_irg(node, get_irn_irg(node));
        if (*res) {
                *res = check_dominance_for_node(node);
        }
}

#endif /* DEBUG_libfirm */

/*
 * Calls irn_verify 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

#ifndef NDEBUG
    last_irg_error = NULL;
#endif /* NDEBUG */

        assert(get_irg_pinned(irg) == op_pin_state_pinned && "Verification need pinned graph");

        if (flags & VERIFY_ENFORCE_SSA)
                compute_doms(irg);

        irg_walk_anchors(
                irg,
                get_irg_dom_state(irg) == dom_consistent &&
                get_irg_pinned(irg) == op_pin_state_pinned ? verify_wrap_ssa : verify_wrap,
                NULL, &res
        );

        if (get_node_verification_mode() == FIRM_VERIFICATION_REPORT && ! res) {
                ir_entity *ent = get_irg_entity(irg);

                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 *)irg);
        }

#else
        (void)irg;
        (void)flags;
#endif /* DEBUG_libfirm */

        return res;
}

typedef struct pass_t {
        ir_graph_pass_t pass;
        unsigned        flags;
} pass_t;

/**
 * Wrapper to irg_verify to be run as an ir_graph pass.
 */
static int irg_verify_wrapper(ir_graph *irg, void *context)
{
        pass_t *pass = (pass_t*)context;
        irg_verify(irg, pass->flags);
        /* do NOT rerun the pass if verify is ok :-) */
        return 0;
}

/* Creates an ir_graph pass for irg_verify(). */
ir_graph_pass_t *irg_verify_pass(const char *name, unsigned flags)
{
        pass_t *pass = XMALLOCZ(pass_t);

        def_graph_pass_constructor(
                &pass->pass, name ? name : "irg_verify", irg_verify_wrapper);

        /* neither dump for verify */
        pass->pass.dump_irg   = (DUMP_ON_IRG_FUNC)ir_prog_no_dump;
        pass->pass.verify_irg = (RUN_ON_IRG_FUNC)ir_prog_no_verify;

        pass->flags = flags;
        return &pass->pass;
}

/* create a verify pass */
int irn_verify_irg_dump(ir_node *n, ir_graph *irg, const char **bad_string)
{
        int res;
        firm_verification_t old = get_node_verification_mode();

        firm_verify_failure_msg = NULL;
        do_node_verification(FIRM_VERIFICATION_ERROR_ONLY);
        res = irn_verify_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);
        do_node_verification(old);
        *bad_string = firm_verify_failure_msg;

        return res;
}

typedef struct verify_bad_env_t {
        int flags;
        int res;
} verify_bad_env_t;

/**
 * Pre-Walker: check Bad predecessors of node.
 */
static void check_bads(ir_node *node, void *env)
{
        verify_bad_env_t *venv = (verify_bad_env_t*)env;
        int i, arity = get_irn_arity(node);
        ir_graph *irg = get_irn_irg(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 (get_node_verification_mode() == FIRM_VERIFICATION_REPORT) {
                                                fprintf(stderr, "irg_verify_bads: Block %ld has Bad predecessor\n", get_irn_node_nr(node));
                                        }
                                        if (get_node_verification_mode() == FIRM_VERIFICATION_ON) {
                                                dump_ir_graph(irg, "-assert");
                                                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 (get_node_verification_mode() == FIRM_VERIFICATION_REPORT) {
                                        fprintf(stderr, "irg_verify_bads: node %ld has Bad Block\n", get_irn_node_nr(node));
                                }
                                if (get_node_verification_mode() == FIRM_VERIFICATION_ON) {
                                        dump_ir_graph(irg, "-assert");
                                        assert(0 && "Bad CF detected");
                                }
                        }
                }

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

                                if (get_node_verification_mode() == FIRM_VERIFICATION_REPORT) {
                                        fprintf(stderr, "irg_verify_bads: node %ld is a Tuple\n", get_irn_node_nr(node));
                                }
                                if (get_node_verification_mode() == FIRM_VERIFICATION_ON) {
                                        dump_ir_graph(irg, "-assert");
                                        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 (get_node_verification_mode() == FIRM_VERIFICATION_REPORT) {
                                                        fprintf(stderr, "irg_verify_bads: Phi %ld has Bad Input\n", get_irn_node_nr(node));
                                                }
                                                if (get_node_verification_mode() == FIRM_VERIFICATION_ON) {
                                                        dump_ir_graph(irg, "-assert");
                                                        assert(0 && "Bad CF detected");
                                                }
                                        }
                                }

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

                                        if (get_node_verification_mode() == FIRM_VERIFICATION_REPORT) {
                                                fprintf(stderr, "irg_verify_bads: node %ld has Bad Input\n", get_irn_node_nr(node));
                                        }
                                        if (get_node_verification_mode() == FIRM_VERIFICATION_ON) {
                                                dump_ir_graph(irg, "-assert");
                                                assert(0 && "Bad NON-CF detected");
                                        }
                                }
                        }
                }
        }
}

/*
 * verify occurrence of bad nodes
 */
int irg_verify_bads(ir_graph *irg, int flags)
{
        verify_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_opcode code, ir_op_ops *ops)
{
#define CASE(a)                           \
   case iro_##a:                          \
     ops->verify_node  = verify_node_##a; \
     break

        switch (code) {
        CASE(Proj);
        CASE(Block);
        CASE(Start);
        CASE(Jmp);
        CASE(IJmp);
        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(Mulh);
        CASE(Div);
        CASE(Mod);
        CASE(And);
        CASE(Or);
        CASE(Eor);
        CASE(Not);
        CASE(Cmp);
        CASE(Shl);
        CASE(Shr);
        CASE(Shrs);
        CASE(Rotl);
        CASE(Conv);
        CASE(Cast);
        CASE(Phi);
        CASE(Load);
        CASE(Store);
        CASE(Alloc);
        CASE(Free);
        CASE(Sync);
        CASE(Confirm);
        CASE(Mux);
        CASE(CopyB);
        CASE(Bound);
        default:
                /* leave NULL */;
        }
#undef CASE

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

        switch (code) {
        CASE(Start);
        CASE(Cond);
        CASE(Raise);
        CASE(InstOf);
        CASE(Call);
        CASE(Div);
        CASE(Mod);
        CASE(Cmp);
        CASE(Load);
        CASE(Store);
        CASE(Alloc);
        CASE(Proj);
        CASE(Tuple);
        CASE(CopyB);
        CASE(Bound);
        default:
                /* leave NULL */;
        }
#undef CASE
}