z3py

Z3py: print large formula with 144 variables

由 会有一股神秘感。 提交于 2019-12-10 10:47:08
问题 I use the Z3 theorem prover and I have a large formula (114 variables). Can I print a large formula with all clauses? A normal print str(f) truncates the output, and only "..." is printed at the end, not all the clauses. I tested print f.sexpr() and this always prints all the clauses. However only in the sexpr syntax. Can I print all the clauses of a formula but avoid the s-expression syntax? Note: the code example is much to small to show the problem, but posting a large formula takes too

How to loop over array in Z3Py

由 天涯浪子 提交于 2019-12-10 08:20:59
问题 As part of a reverse engineering exercise, I'm trying to write a Z3 solver to find a username and password that satisfy the program below. This is especially tough because the z3py tutorial that everyone refers to (rise4fun) is down. #include <iostream> #include <string> using namespace std; int main() { string name, pass; cout << "Name: "; cin >> name; cout << "Pass: "; cin >> pass; int sum = 0; for (size_t i = 0; i < name.size(); i++) { char c = name[i]; if (c < 'A') { cout << "Lose: char

Multi-threaded Z3?

由 假如想象 提交于 2019-12-08 19:53:04
问题 I'm working on a Python project, where I'm currently trying to speed things up in some horrible ways: I set up my Z3 solvers, then I fork the process, and have Z3 perform the solve in the child process and pass a pickle-able representation of the model back to the parent. This works great, and represents the first stage of what I'm trying to do: the parent process is now no longer CPU-bound. The next step is to multi-thread the parent, so that we can solve multiple Z3 solvers in parallel. I'm

Z3py returns unknown for equation using pow() function

由 那年仲夏 提交于 2019-12-08 08:04:13
问题 Z3py returns unknown for the following simple problem using pow() function. import z3; goal = z3.Goal(); goal = z3.Then('purify-arith','nlsat'); solver = goal.solver(); x = z3.Real('x'); solver.add(x <= 1.8); solver.add(x >= 0); z = 10**x; #z = pow(10,x) returns same result solver.add(z >= 0, z <= 1.8); print solver.check() returns unknown Obviously x = 0, z = 1 is a satisfactory solution. Any suggestions in changing the way the equations are constructed, or modifying the tactics are

Using SMT-LIB to count the number of modules using a formula

由 萝らか妹 提交于 2019-12-08 07:12:44
问题 I am not sure that this is possible using SMT-LIB, if it is not possible does an alternative solver exist that can do it? Consider the equations a < 10 and a > 5 b < 5 and b > 0 b < c < a with a , b and c integers The values for a and b where the maximum number of model exist that satisfy the equations when a=9 and b=1 . Do SMT-LIB support the following: For each values of a and b count the number of models that satisfy the formulas and give the value for a and b that maximize the count. 回答1:

Using SMT-LIB to count the number of modules using a formula

由 ↘锁芯ラ 提交于 2019-12-08 04:10:28
I am not sure that this is possible using SMT-LIB, if it is not possible does an alternative solver exist that can do it? Consider the equations a < 10 and a > 5 b < 5 and b > 0 b < c < a with a , b and c integers The values for a and b where the maximum number of model exist that satisfy the equations when a=9 and b=1 . Do SMT-LIB support the following: For each values of a and b count the number of models that satisfy the formulas and give the value for a and b that maximize the count. Let's break down your goals: You want to enumerate all possible ways in which a and b (...and more) can be

Prove 2 formulas equivalent under some conditions?

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-07 12:55:26
问题 Two formulas a1 == a + b and a1 == b are equivalent if a == 0 . I want to find this required condition ( a == 0 ) with Z3 python. I wrote the code below: from z3 import * def equivalence(F, G): s = Solver() s.add(Not(F == G)) r = s.check() if r == unsat: print 'Equ' print s.model() else: print 'Not Equ' a, b = BitVecs('a b', 32) g = True tmp = BitVec('tmp', 32) g = And(g, tmp == a) tmp1 = BitVec('tmp1', 32) g = And(g, tmp1 == b) tmp2 = BitVec('tmp2', 32) g = And(g, tmp2 == (tmp1 + tmp)) a1 =

Z3py returns unknown for equation using pow() function

由 给你一囗甜甜゛ 提交于 2019-12-07 12:40:34
Z3py returns unknown for the following simple problem using pow() function. import z3; goal = z3.Goal(); goal = z3.Then('purify-arith','nlsat'); solver = goal.solver(); x = z3.Real('x'); solver.add(x <= 1.8); solver.add(x >= 0); z = 10**x; #z = pow(10,x) returns same result solver.add(z >= 0, z <= 1.8); print solver.check() returns unknown Obviously x = 0, z = 1 is a satisfactory solution. Any suggestions in changing the way the equations are constructed, or modifying the tactics are appreciated. Taylor T. Johnson There may be some bug, but the following returns a model of x = 0 and z = 1 ,

Solving formulas in parallel with z3

由 陌路散爱 提交于 2019-12-07 06:09:17
问题 Let's say I have a z3 solver with a certain number of asserted constraints that are satisfiable. Let S be a set of constraints, I would like to verify for every constraint in S whether the formula is still satisfiable when adding the constraint to the solver. This can be easily done sequentially in such a fashion: results = [] for constraint in S: solver.push() solver.add(constraint) results.append(solver.check() == z3.sat) solver.pop() print all(results) Now, I would like to parallelize this

z3python: using math library

由 我们两清 提交于 2019-12-06 11:01:53
问题 I was trying to use python's math library with z3python, what I did was import z3 import math a,b = z3.Reals('a b') solve(b == math.factorial(a), b == 6) The error message it returns is AttributeError: ArithRef instance has no attribute ' float '. My purpose is not really using the factorial function in Z3, rather I am curious if the functions from the math library can be used with Z3 in general. Any suggestion is appreciated. 回答1: In general, no, this is not possible. The reason is that
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