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btormodel.c
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btormodel.c
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/* Boolector: Satisfiablity Modulo Theories (SMT) solver.
*
* Copyright (C) 2014-2015 Mathias Preiner.
* Copyright (C) 2014-2015 Aina Niemetz.
*
* All rights reserved.
*
* This file is part of Boolector.
* See COPYING for more information on using this software.
*/
#include "btormodel.h"
#include "btorbeta.h"
#include "btorexit.h"
#include "utils/btormem.h"
#include "utils/btoriter.h"
#include "utils/btorutil.h"
#include "utils/btormisc.h"
#include "btorlog.h"
#define BTOR_ABORT_MODEL(cond,msg) \
do { \
if (cond) \
{ \
printf ("[btormodel] %s: %s\n", __func__, msg); \
fflush (stdout); \
exit (BTOR_ERR_EXIT); \
} \
} while (0)
void
btor_delete_bv_model (Btor * btor, BtorPtrHashTable ** bv_model)
{
assert (btor);
assert (bv_model);
BtorBitVector *bv;
BtorNode *cur;
BtorHashTableIterator it;
if (!*bv_model) return;
btor_init_node_hash_table_iterator (&it, *bv_model);
while (btor_has_next_node_hash_table_iterator (&it))
{
bv = (BtorBitVector *) it.bucket->data.asPtr;
cur = btor_next_node_hash_table_iterator (&it);
btor_free_bv (btor->mm, bv);
btor_release_exp (btor, cur);
}
btor_delete_ptr_hash_table (*bv_model);
*bv_model = 0;
}
void
btor_init_bv_model (Btor * btor, BtorPtrHashTable ** bv_model)
{
assert (btor);
assert (bv_model);
if (*bv_model) btor_delete_bv_model (btor, bv_model);
*bv_model =
btor_new_ptr_hash_table (btor->mm,
(BtorHashPtr) btor_hash_exp_by_id,
(BtorCmpPtr) btor_compare_exp_by_id);
}
void
btor_add_to_bv_model (Btor * btor,
BtorPtrHashTable * bv_model,
BtorNode * exp,
BtorBitVector * assignment)
{
assert (btor);
assert (bv_model);
assert (exp);
assert (assignment);
BtorPtrHashBucket *b;
assert (!btor_find_in_ptr_hash_table (bv_model, exp));
b = btor_insert_in_ptr_hash_table (bv_model, btor_copy_exp (btor, exp));
b->data.asPtr = btor_copy_bv (btor->mm, assignment);
}
void
btor_remove_from_bv_model (Btor * btor,
BtorPtrHashTable * bv_model,
BtorNode * exp)
{
BtorPtrHashData d;
assert (btor_find_in_ptr_hash_table (bv_model, exp));
btor_remove_from_ptr_hash_table (bv_model, exp, 0, &d);
btor_free_bv (btor->mm, d.asPtr);
btor_release_exp (btor, exp);
}
static void
delete_fun_model (Btor * btor, BtorPtrHashTable ** fun_model)
{
assert (btor);
assert (fun_model);
BtorBitVectorTuple *tup;
BtorBitVector *value;
BtorNode *cur;
BtorHashTableIterator it1, it2;
BtorPtrHashTable *t;
if (!*fun_model) return;
btor_init_node_hash_table_iterator (&it1, *fun_model);
while (btor_has_next_node_hash_table_iterator (&it1))
{
t = (BtorPtrHashTable *) it1.bucket->data.asPtr;
cur = btor_next_node_hash_table_iterator (&it1);
btor_init_hash_table_iterator (&it2, t);
while (btor_has_next_hash_table_iterator (&it2))
{
value = (BtorBitVector *) it2.bucket->data.asPtr;
tup = (BtorBitVectorTuple *) btor_next_hash_table_iterator (&it2);
btor_free_bv_tuple (btor->mm, tup);
btor_free_bv (btor->mm, value);
}
btor_release_exp (btor, cur);
btor_delete_ptr_hash_table (t);
}
btor_delete_ptr_hash_table (*fun_model);
*fun_model = 0;
}
void
btor_init_fun_model (Btor * btor, BtorPtrHashTable ** fun_model)
{
assert (btor);
assert (fun_model);
if (*fun_model) delete_fun_model (btor, fun_model);
*fun_model =
btor_new_ptr_hash_table (btor->mm,
(BtorHashPtr) btor_hash_exp_by_id,
(BtorCmpPtr) btor_compare_exp_by_id);
}
static void
add_to_fun_model (Btor * btor,
BtorPtrHashTable * fun_model,
BtorNode * exp,
BtorBitVectorTuple * t,
BtorBitVector * value)
{
assert (btor);
assert (fun_model);
assert (exp);
assert (BTOR_IS_REGULAR_NODE (exp));
assert (t);
assert (value);
BtorPtrHashTable *model;
BtorPtrHashBucket *b;
b = btor_find_in_ptr_hash_table (fun_model, exp);
if (b)
model = (BtorPtrHashTable *) b->data.asPtr;
else
{
model = btor_new_ptr_hash_table (btor->mm,
(BtorHashPtr) btor_hash_bv_tuple,
(BtorCmpPtr) btor_compare_bv_tuple);
btor_insert_in_ptr_hash_table (fun_model,
btor_copy_exp (btor, exp))->data.asPtr = model;
}
if ((b = btor_find_in_ptr_hash_table (model, t)))
{
assert (btor_compare_bv (b->data.asPtr, value) == 0);
return;
}
b = btor_insert_in_ptr_hash_table (model, btor_copy_bv_tuple (btor->mm, t));
b->data.asPtr = btor_copy_bv (btor->mm, value);
}
static BtorBitVector *
get_value_from_fun_model (Btor * btor,
BtorPtrHashTable * fun_model,
BtorNode * exp,
BtorBitVectorTuple * t)
{
assert (btor);
assert (fun_model);
assert (exp);
assert (t);
assert (BTOR_IS_REGULAR_NODE (exp));
assert (BTOR_IS_FUN_NODE (exp));
BtorPtrHashTable *model;
BtorPtrHashBucket *b;
b = btor_find_in_ptr_hash_table (fun_model, exp);
if (!b) return 0;
model = (BtorPtrHashTable *) b->data.asPtr;
b = btor_find_in_ptr_hash_table (model, t);
if (!b) return 0;
return btor_copy_bv (btor->mm, (BtorBitVector *) b->data.asPtr);
}
/* Note: don't forget to free resulting bit vector! */
BtorBitVector *
btor_recursively_compute_assignment (Btor * btor,
BtorPtrHashTable * bv_model,
BtorPtrHashTable * fun_model,
BtorNode * exp)
{
assert (btor);
assert (bv_model);
assert (fun_model);
assert (exp);
int i, num_args, pos;
BtorMemMgr *mm;
BtorNodePtrStack work_stack, cleanup, reset;
BtorVoidPtrStack arg_stack;
BtorNode *cur, *real_cur, *next, *cur_parent;
BtorPtrHashData d;
BtorPtrHashBucket *b;
BtorPtrHashTable *assigned, *reset_st, *param_model_cache;
BtorBitVector *result = 0, *inv_result, **e;
BtorBitVectorTuple *t;
mm = btor->mm;
assigned = btor_new_ptr_hash_table (mm,
(BtorHashPtr) btor_hash_exp_by_id,
(BtorCmpPtr) btor_compare_exp_by_id);
/* model cache for parameterized nodes */
param_model_cache = btor_new_ptr_hash_table (mm, 0, 0);
/* 'reset_st' remembers the stack position of 'reset' in case a lambda is
* assigned. when the resp. lambda is unassigned, the 'eval_mark' flag of all
* parameterized nodes up to the saved position of stack 'reset' will be
* reset to 0. */
reset_st = btor_new_ptr_hash_table (mm,
(BtorHashPtr) btor_hash_exp_by_id,
(BtorCmpPtr) btor_compare_exp_by_id);
BTOR_INIT_STACK (work_stack);
BTOR_INIT_STACK (arg_stack);
BTOR_INIT_STACK (cleanup);
BTOR_INIT_STACK (reset);
BTOR_PUSH_STACK (mm, work_stack, exp);
BTOR_PUSH_STACK (mm, work_stack, 0);
assert (!BTOR_REAL_ADDR_NODE (exp)->eval_mark);
while (!BTOR_EMPTY_STACK (work_stack))
{
cur_parent = BTOR_POP_STACK (work_stack);
cur = BTOR_POP_STACK (work_stack);
real_cur = BTOR_REAL_ADDR_NODE (cur);
assert (!real_cur->simplified);
if (btor_find_in_ptr_hash_table (bv_model, real_cur)
|| btor_find_in_ptr_hash_table (param_model_cache, real_cur))
goto PUSH_CACHED;
/* check if we already have an assignment for this function application */
if (BTOR_IS_LAMBDA_NODE (real_cur)
&& cur_parent && BTOR_IS_APPLY_NODE (cur_parent)
/* if real_cur was assigned by cur_parent, we are not allowed to use
* a cached result, but instead rebuild cur_parent */
&& (!(b = btor_find_in_ptr_hash_table (assigned, real_cur))
|| b->data.asPtr != cur_parent))
{
num_args = btor_get_args_arity (btor, cur_parent->e[1]);
e = (BtorBitVector **) arg_stack.top - num_args;
t = btor_new_bv_tuple (mm, num_args);
for (i = 0; i < num_args; i++)
btor_add_to_bv_tuple (mm, t, e[i], num_args - 1 - i);
/* check if there is already a value for given arguments */
result = get_value_from_fun_model (
btor, fun_model, cur_parent->e[0], t);
btor_free_bv_tuple (mm, t);
if (result)
goto PUSH_RESULT;
}
if (real_cur->eval_mark == 0)
{
/* add assignment of bv var to model (creates new assignment, if
* it doesn't have one) */
if (BTOR_IS_BV_VAR_NODE (real_cur))
{
result = btor_assignment_bv (mm, real_cur, true);
goto CACHE_AND_PUSH_RESULT;
}
else if (BTOR_IS_BV_CONST_NODE (real_cur))
{
result = btor_copy_bv (mm, btor_const_get_bits (real_cur));
goto CACHE_AND_PUSH_RESULT;
}
/* substitute param with its assignment */
else if (BTOR_IS_PARAM_NODE (real_cur))
{
next = btor_param_cur_assignment (real_cur);
assert (next);
next = BTOR_COND_INVERT_NODE (cur, next);
BTOR_PUSH_STACK (mm, work_stack, next);
BTOR_PUSH_STACK (mm, work_stack, cur_parent);
continue;
}
else if (BTOR_IS_FEQ_NODE (real_cur))
{
result = btor_assignment_bv (mm, real_cur, true);
goto CACHE_AND_PUSH_RESULT;
}
else if (BTOR_IS_LAMBDA_NODE (real_cur)
&& cur_parent
&& BTOR_IS_APPLY_NODE (cur_parent))
{
btor_assign_args (btor, real_cur, cur_parent->e[1]);
assert (!btor_find_in_ptr_hash_table (assigned, real_cur));
btor_insert_in_ptr_hash_table (assigned, real_cur)->data.asPtr =
cur_parent;
/* save 'reset' stack position */
btor_insert_in_ptr_hash_table (reset_st, real_cur)->data.asInt =
BTOR_COUNT_STACK (reset);
}
BTOR_PUSH_STACK (mm, work_stack, cur);
BTOR_PUSH_STACK (mm, work_stack, cur_parent);
real_cur->eval_mark = 1;
BTOR_PUSH_STACK (mm, cleanup, real_cur);
/* special handling for conditionals:
* 1) push condition
* 2) evaluate condition
* 3) push branch w.r.t. value of evaluated condition */
if (BTOR_IS_COND_NODE (real_cur))
{
real_cur->eval_mark = 3;
BTOR_PUSH_STACK (mm, work_stack, real_cur->e[0]);
BTOR_PUSH_STACK (mm, work_stack, real_cur);
}
else
{
for (i = 0; i < real_cur->arity; i++)
{
BTOR_PUSH_STACK (mm, work_stack, real_cur->e[i]);
BTOR_PUSH_STACK (mm, work_stack, real_cur);
}
}
}
else if (real_cur->eval_mark == 1 || real_cur->eval_mark == 3)
{
assert (!BTOR_IS_PARAM_NODE (real_cur));
assert (real_cur->arity <= 3);
/* leave arguments on stack, we need them later for apply */
if (BTOR_IS_ARGS_NODE (real_cur))
{
assert (real_cur->eval_mark == 1);
real_cur->eval_mark = 0;
continue;
}
num_args = 0;
if (BTOR_IS_APPLY_NODE (real_cur))
{
num_args = btor_get_args_arity (btor, real_cur->e[1]);
arg_stack.top -= 1; /* value of apply */
arg_stack.top -= num_args; /* arguments of apply */
real_cur->eval_mark = 2;
}
/* special handling for conditionals:
* 1) push condition
* 2) evaluate condition
* 3) push branch w.r.t. value of evaluated condition */
else if (BTOR_IS_COND_NODE (real_cur))
{
/* only the condition is on the stack */
assert (BTOR_COUNT_STACK (arg_stack) >= 1);
arg_stack.top -= 1;
}
else
{
assert (BTOR_COUNT_STACK (arg_stack) >= real_cur->arity);
arg_stack.top -= real_cur->arity;
real_cur->eval_mark = 2;
}
e = (BtorBitVector **) arg_stack.top; /* arguments in reverse order */
switch (real_cur->kind)
{
case BTOR_SLICE_NODE:
result = btor_slice_bv (
mm, e[0], btor_slice_get_upper (real_cur),
btor_slice_get_lower (real_cur));
btor_free_bv (mm, e[0]);
break;
case BTOR_AND_NODE:
result = btor_and_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_BEQ_NODE:
result = btor_eq_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_ADD_NODE:
result = btor_add_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_MUL_NODE:
result = btor_mul_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_ULT_NODE:
result = btor_ult_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_SLL_NODE:
result = btor_sll_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_SRL_NODE:
result = btor_srl_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_UDIV_NODE:
result = btor_udiv_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_UREM_NODE:
result = btor_urem_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_CONCAT_NODE:
result = btor_concat_bv (mm, e[1], e[0]);
btor_free_bv (mm, e[0]);
btor_free_bv (mm, e[1]);
break;
case BTOR_APPLY_NODE:
assert (num_args);
t = btor_new_bv_tuple (mm, num_args);
for (i = 0; i < num_args; i++)
{
btor_add_to_bv_tuple (mm, t, e[i], num_args - 1 - i);
btor_free_bv (mm, e[i]);
}
/* check if there is already a value for given arguments */
result = get_value_from_fun_model (
btor, fun_model, real_cur->e[0], t);
if (!result)
{
/* value of apply is at last index of e */
result = e[num_args];
add_to_fun_model (
btor, fun_model, real_cur->e[0], t, result);
}
else
btor_free_bv (mm, e[num_args]);
btor_free_bv_tuple (mm, t);
break;
case BTOR_LAMBDA_NODE:
result = e[0];
btor_free_bv (mm, e[1]);
if (BTOR_IS_LAMBDA_NODE (real_cur)
&& cur_parent
&& BTOR_IS_APPLY_NODE (cur_parent))
{
assert (btor_find_in_ptr_hash_table (assigned, real_cur));
btor_unassign_params (btor, real_cur);
btor_remove_from_ptr_hash_table (assigned, real_cur, 0, 0);
/* reset 'eval_mark' of all parameterized nodes
* instantiated by 'real_cur' */
btor_remove_from_ptr_hash_table (reset_st, real_cur, 0, &d);
pos = d.asInt;
while (BTOR_COUNT_STACK (reset) > pos)
{
next = BTOR_POP_STACK (reset);
assert (BTOR_IS_REGULAR_NODE (next));
assert (next->parameterized);
next->eval_mark = 0;
btor_remove_from_ptr_hash_table (
param_model_cache, next, 0, &d);
btor_free_bv (mm, d.asPtr);
}
}
break;
case BTOR_UF_NODE:
result = btor_assignment_bv (mm, cur_parent, true);
break;
default:
assert (BTOR_IS_COND_NODE (real_cur));
/* evaluate condition and select branch */
if (real_cur->eval_mark == 3)
{
/* select branch w.r.t. condition */
next =
btor_is_true_bv (e[0]) ? real_cur->e[1] : real_cur->e[2];
BTOR_PUSH_STACK (mm, work_stack, cur);
BTOR_PUSH_STACK (mm, work_stack, cur_parent);
/* for function conditionals we push the function and the
* apply */
BTOR_PUSH_STACK (mm, work_stack, next);
BTOR_PUSH_STACK (mm, work_stack, cur_parent);
btor_free_bv (mm, e[0]);
/* no result yet, we need to evaluate the selected function
*/
real_cur->eval_mark = 1;
continue;
}
/* cache result */
else
{
assert (real_cur->eval_mark == 1);
result = e[0];
real_cur->eval_mark = 2;
}
}
/* function nodes are never cached (assignment always depends on the
* given arguments) */
if (BTOR_IS_FUN_NODE (real_cur))
{
assert (result);
real_cur->eval_mark = 0; /* not inserted into cache */
goto PUSH_RESULT;
}
else if (BTOR_IS_APPLY_NODE (real_cur))
{
real_cur->eval_mark = 0; /* not inserted into cache */
if (real_cur->parameterized)
goto PUSH_RESULT;
}
CACHE_AND_PUSH_RESULT:
assert (!BTOR_IS_FUN_NODE (real_cur));
/* remember parameterized nodes for resetting 'eval_mark' later */
if (real_cur->parameterized)
{
BTOR_PUSH_STACK (mm, reset, real_cur);
/* temporarily cache model for paramterized nodes, is only
* valid under current parameter assignment and will be reset
* when parameters are unassigned */
assert (!btor_find_in_ptr_hash_table (
param_model_cache, real_cur));
btor_insert_in_ptr_hash_table (
param_model_cache, real_cur)->data.asPtr =
btor_copy_bv (mm, result);
}
else
{
assert (!btor_find_in_ptr_hash_table (bv_model, real_cur));
btor_add_to_bv_model (btor, bv_model, real_cur, result);
}
PUSH_RESULT:
if (BTOR_IS_INVERTED_NODE (cur))
{
inv_result = btor_not_bv (mm, result);
btor_free_bv (mm, result);
result = inv_result;
}
BTOR_PUSH_STACK (mm, arg_stack, result);
}
else
{
assert (real_cur->eval_mark == 2);
PUSH_CACHED:
if (real_cur->parameterized)
b = btor_find_in_ptr_hash_table (param_model_cache, real_cur);
else
b = btor_find_in_ptr_hash_table (bv_model, real_cur);
assert (b);
result = btor_copy_bv (mm, (BtorBitVector *) b->data.asPtr);
goto PUSH_RESULT;
}
}
assert (param_model_cache->count == 0);
assert (BTOR_COUNT_STACK (arg_stack) == 1);
result = BTOR_POP_STACK (arg_stack);
assert (result);
for (i = 0; i < BTOR_COUNT_STACK (cleanup); i++)
{
real_cur = BTOR_PEEK_STACK (cleanup, i);
real_cur->eval_mark = 0;
}
BTOR_RELEASE_STACK (mm, work_stack);
BTOR_RELEASE_STACK (mm, arg_stack);
BTOR_RELEASE_STACK (mm, cleanup);
BTOR_RELEASE_STACK (mm, reset);
btor_delete_ptr_hash_table (assigned);
btor_delete_ptr_hash_table (reset_st);
btor_delete_ptr_hash_table (param_model_cache);
return result;
}
static void
recursively_compute_function_model (Btor * btor,
BtorPtrHashTable * bv_model,
BtorPtrHashTable * fun_model,
BtorNode * fun)
{
assert (btor);
assert (fun_model);
assert (fun);
assert (BTOR_IS_REGULAR_NODE (fun));
assert (BTOR_IS_FUN_NODE (fun));
int i;
unsigned pos;
BtorNode *value, *args, *arg, *cur_fun, *cur;
BtorArgsIterator ait;
BtorHashTableIterator it;
BtorPtrHashTable *model, *static_rho;
BtorPtrHashBucket *b;
BtorBitVectorTuple *t;
BtorBitVector *bv_arg, *bv_value;
BtorMemMgr *mm;
BtorNodePtrStack stack;
mm = btor->mm;
if (!fun->rho
&& (!BTOR_IS_LAMBDA_NODE (fun) || !btor_lambda_get_static_rho (fun)))
return;
b = btor_find_in_ptr_hash_table (fun_model, fun);
model = b ? b->data.asPtr : 0;
cur_fun = fun;
while (cur_fun)
{
assert (BTOR_IS_FUN_NODE (cur_fun));
if (cur_fun->rho)
btor_init_node_hash_table_iterator (&it, cur_fun->rho);
if (BTOR_IS_LAMBDA_NODE (cur_fun)
&& (static_rho = btor_lambda_get_static_rho (cur_fun)))
{
if (cur_fun->rho)
btor_queue_node_hash_table_iterator (&it, static_rho);
else
btor_init_node_hash_table_iterator (&it, static_rho);
}
while (btor_has_next_node_hash_table_iterator (&it))
{
value = (BtorNode *) it.bucket->data.asPtr;
args = btor_next_node_hash_table_iterator (&it);
assert (!BTOR_REAL_ADDR_NODE (value)->parameterized);
assert (BTOR_IS_REGULAR_NODE (args));
assert (BTOR_IS_ARGS_NODE (args));
assert (!args->parameterized);
t = btor_new_bv_tuple (mm, btor_get_args_arity (btor, args));
pos = 0;
btor_init_args_iterator (&ait, args);
while (btor_has_next_args_iterator (&ait))
{
arg = btor_next_args_iterator (&ait);
bv_arg = btor_recursively_compute_assignment (
btor, bv_model, fun_model, arg);
btor_add_to_bv_tuple (mm, t, bv_arg, pos++);
btor_free_bv (mm, bv_arg);
}
bv_value = btor_recursively_compute_assignment (
btor, bv_model, fun_model, value);
/* if static_rho contains arguments with the same assignments, but map
* to different values, we consider the argument which occurs
* earlier in static_rho. */
if (!model || !btor_find_in_ptr_hash_table (model, t))
{
add_to_fun_model (btor, fun_model, fun, t, bv_value);
if (!model)
{
b = btor_find_in_ptr_hash_table (fun_model, fun);
assert (b);
model = b->data.asPtr;
}
}
else if (!btor_find_in_ptr_hash_table (model, t))
add_to_fun_model (btor, fun_model, fun, t, bv_value);
btor_free_bv (btor->mm, bv_value);
btor_free_bv_tuple (btor->mm, t);
}
if (BTOR_IS_LAMBDA_NODE (cur_fun))
{
if (btor_lambda_get_static_rho (cur_fun))
{
BTOR_INIT_STACK (stack);
BTOR_PUSH_STACK (mm, stack, btor_lambda_get_body (cur_fun));
cur_fun = 0;
while (!BTOR_EMPTY_STACK (stack))
{
cur = BTOR_REAL_ADDR_NODE (BTOR_POP_STACK (stack));
if (BTOR_IS_FUN_NODE (cur))
{
cur_fun = cur;
break;
}
if (!cur->parameterized || !cur->apply_below)
continue;
for (i = 0; i < cur->arity; i++)
BTOR_PUSH_STACK (mm, stack, cur->e[i]);
}
BTOR_RELEASE_STACK (mm, stack);
}
else
{
cur_fun = 0;
// TODO: what do we have to do here?
}
}
else if (BTOR_IS_FUN_COND_NODE (cur_fun))
{
if (cur_fun->parameterized)
{
cur_fun = 0;
// TODO: print warning that branch cannot be selected
}
else
{
assert (!BTOR_REAL_ADDR_NODE (cur_fun->e[0])->parameterized);
value = cur_fun->e[0];
bv_value = btor_recursively_compute_assignment (
btor, bv_model, fun_model, value);
if (btor_is_true_bv (bv_value))
cur_fun = cur_fun->e[1];
else
{
assert (btor_is_false_bv (bv_value));
cur_fun = cur_fun->e[2];
}
btor_free_bv (mm, bv_value);
}
}
else
{
assert (BTOR_IS_UF_NODE (cur_fun));
cur_fun = 0;
}
}
}
// TODO (ma): recursively compute fun model
#if 0
static void
extract_model_from_rhos (Btor * btor, BtorPtrHashTable * fun_model,
BtorNode * fun)
{
int pos;
BtorNode *arg, *value, *args;
BtorBitVector *bv_arg, *bv_value;
BtorBitVectorTuple *t;
BtorHashTableIterator it;
BtorPtrHashTable *model = 0;
BtorArgsIterator ait;
BtorPtrHashBucket *b;
if (!fun->rho
&& (!BTOR_IS_LAMBDA_NODE (fun) || !btor_lambda_get_static_rho (fun)))
return;
b = btor_find_in_ptr_hash_table (fun_model, fun);
if (b)
model = b->data.asPtr;
if (fun->rho)
{
btor_init_node_hash_table_iterator (&it, fun->rho);
if (BTOR_IS_LAMBDA_NODE (fun) && btor_lambda_get_static_rho (fun))
btor_queue_node_hash_table_iterator (&it,
btor_lambda_get_static_rho (fun));
}
else if (BTOR_IS_LAMBDA_NODE (fun) && btor_lambda_get_static_rho (fun))
btor_init_node_hash_table_iterator (&it, btor_lambda_get_static_rho (fun));
while (btor_has_next_node_hash_table_iterator (&it))
{
value = (BtorNode *) it.bucket->data.asPtr;
assert (!BTOR_REAL_ADDR_NODE (value)->parameterized);
args = btor_next_node_hash_table_iterator (&it);
assert (BTOR_IS_REGULAR_NODE (args));
assert (BTOR_IS_ARGS_NODE (args));
assert (!args->parameterized);
t = btor_new_bv_tuple (btor->mm, btor_get_args_arity (btor, args));
pos = 0;
btor_init_args_iterator (&ait, args);
while (btor_has_next_args_iterator (&ait))
{
arg = btor_next_args_iterator (&ait);
/* all arguments in 'rho' are encoded, however some arguments in
* 'static_rho' might not be encoded and thus we have to obtain the
* assignment from the constructed model. */
if (btor_is_encoded_exp (arg))
bv_arg = btor_assignment_bv (btor->mm, arg, 0);
else
bv_arg = btor_copy_bv (btor->mm, btor_get_bv_model (btor, arg));
btor_add_to_bv_tuple (btor->mm, t, bv_arg, pos++);
btor_free_bv (btor->mm, bv_arg);
}
/* values in 'rho' are encoded, however some values in 'static_rho' might
* not be encoded and thus we have to obtain the assignment from the
* constructed model. */
if (btor_is_encoded_exp (value))
bv_value = btor_assignment_bv (btor->mm, value, 0);
else
bv_value = btor_copy_bv (btor->mm, btor_get_bv_model (btor, value));
if (!model)
{
add_to_fun_model (btor, fun_model, fun, t, bv_value);
b = btor_find_in_ptr_hash_table (fun_model, fun);
assert (b);
model = b->data.asPtr;
}
/* if static_rho contains arguments with the same assignments, but map
* to different values, we consider the argument which occurs
* earlier in static_rho. */
else if (!btor_find_in_ptr_hash_table (model, t))
add_to_fun_model (btor, fun_model, fun, t, bv_value);
btor_free_bv (btor->mm, bv_value);
btor_free_bv_tuple (btor->mm, t);
}
}
#endif
void
btor_generate_model (Btor * btor,
BtorPtrHashTable * bv_model,
BtorPtrHashTable * fun_model,
int model_for_all_nodes)
{
assert (btor);
assert (bv_model);
assert (fun_model);
int i;
double start;
BtorNode *cur;
BtorHashTableIterator it;
BtorNodePtrStack stack;
BtorBitVector *bv;
start = btor_time_stamp ();
BTOR_INIT_STACK (stack);
/* NOTE: adding fun_rhs is only needed for extensional benchmarks */
btor_init_node_hash_table_iterator (&it, btor->fun_rhs);
if (!model_for_all_nodes)
{
btor_queue_node_hash_table_iterator (&it, btor->var_rhs);
btor_queue_node_hash_table_iterator (&it, btor->bv_vars);
btor_queue_node_hash_table_iterator (&it, btor->ufs);
}
while (btor_has_next_node_hash_table_iterator (&it))
{
cur = btor_simplify_exp (btor, btor_next_node_hash_table_iterator (&it));
BTOR_PUSH_STACK (btor->mm, stack, BTOR_REAL_ADDR_NODE (cur));
}
if (model_for_all_nodes)
{
for (i = 1; i < BTOR_COUNT_STACK (btor->nodes_id_table); i++)
{
cur = BTOR_PEEK_STACK (btor->nodes_id_table, i);
if (!cur
|| BTOR_IS_ARGS_NODE (cur)
|| BTOR_IS_PROXY_NODE (cur)
|| cur->parameterized)
continue;
BTOR_PUSH_STACK (btor->mm, stack, cur);
}
}
else /* push roots only */
{
btor_init_node_hash_table_iterator (&it, btor->unsynthesized_constraints);
btor_queue_node_hash_table_iterator (&it, btor->synthesized_constraints);
btor_queue_node_hash_table_iterator (&it, btor->assumptions);
while (btor_has_next_node_hash_table_iterator (&it))
{
cur = btor_next_node_hash_table_iterator (&it);
BTOR_PUSH_STACK (btor->mm, stack, cur);
}
}
qsort (stack.start, BTOR_COUNT_STACK (stack), sizeof (BtorNode *),
btor_cmp_exp_by_id_qsort_asc);
for (i = 0; i < BTOR_COUNT_STACK (stack); i++)
{
cur = BTOR_PEEK_STACK (stack, i);
assert (!cur->parameterized);
BTORLOG (1, "generate model for %s", node2string (cur));
if (BTOR_IS_FUN_NODE (cur))
recursively_compute_function_model (btor, bv_model, fun_model, cur);
else
{
bv = btor_recursively_compute_assignment (btor, bv_model,
fun_model, cur);
btor_free_bv (btor->mm, bv);
}
}
BTOR_RELEASE_STACK (btor->mm, stack);
btor->time.model_gen += btor_time_stamp () - start;
}
void
btor_delete_model (Btor * btor)
{
assert (btor);
btor_delete_bv_model (btor, &btor->bv_model);
delete_fun_model (btor, &btor->fun_model);
}
/* Note: no need to free returned bit vector,
* all bit vectors are maintained via btor->bv_model */
const BtorBitVector *
btor_get_bv_model_aux (Btor * btor,
BtorPtrHashTable ** bv_model,
BtorPtrHashTable ** fun_model,
BtorNode * exp)
{
assert (btor);
assert (bv_model);
assert (*bv_model);
assert (fun_model);
assert (*fun_model);
assert (exp);
assert (!BTOR_IS_PROXY_NODE (BTOR_REAL_ADDR_NODE (exp)));
BtorBitVector *result;
BtorPtrHashBucket *b;
b = btor_find_in_ptr_hash_table (*bv_model, exp);
if (!b)
{
b = btor_find_in_ptr_hash_table (*bv_model, BTOR_REAL_ADDR_NODE (exp));
/* if exp has no assignment, regenerate model in case that it is an exp
* that previously existed but was simplified (i.e. the original exp is
* now a proxy and was therefore regenerated when querying it's
* assignment via get-value in SMT-LIB v2) */
if (!b)
{
result = btor_recursively_compute_assignment (btor, *bv_model,
*fun_model, exp);
btor_free_bv (btor->mm, result);
}
b = btor_find_in_ptr_hash_table (*bv_model, BTOR_REAL_ADDR_NODE (exp));
if (!b) return 0;
}
result = (BtorBitVector *) b->data.asPtr;
/* Note: we cache assignments of inverted expressions on demand */