Termination proof of /tmp/tmpXeEQJ2/PastaB4.jar

Termination of the given JBC could be proven:

0 JBC

↳1 JBC2FIG (⇐)

↳2 FIGraph

↳3 FIGtoITRSProof (⇐)

↳4 ITRS

↳5 ITRStoIDPProof (⇔)

↳6 IDP

↳7 UsableRulesProof (⇔)

↳8 IDP

↳9 IDPNonInfProof (⇐)

↳10 AND

    ↳11 IDP

        ↳12 IDependencyGraphProof (⇔)

        ↳13 TRUE

    ↳14 IDP

        ↳15 IDependencyGraphProof (⇔)

        ↳16 TRUE

(0) Obligation:

JBC Problem based on JBC Program:
Manifest-Version: 1.0 Created-By: 1.6.0_16 (Sun Microsystems Inc.) Main-Class: PastaB4

/**
 * Example taken from "A Term Rewriting Approach to the Automated Termination
 * Analysis of Imperative Programs" (http://www.cs.unm.edu/~spf/papers/2009-02.pdf)
 * and converted to Java.
 */

public class PastaB4 {
    public static void main(String[] args) {
        Random.args = args;
        int x = Random.random();
        int y = Random.random();

        while (x > y) {
            int t = x;
            x = y;
            y = t;
        }
    }
}


public class Random {
  static String[] args;
  static int index = 0;

  public static int random() {
    String string = args[index];
    index++;
    return string.length();
  }
}

(1) JBC2FIG (SOUND transformation)

Constructed FIGraph.

(2) Obligation:

FIGraph based on JBC Program:
Graph of 189 nodes with 1 SCC.

(3) FIGtoITRSProof (SOUND transformation)

Transformed FIGraph to ITRS rules

(4) Obligation:

ITRS problem:

The following function symbols are pre-defined:

!=	~	Neq: (Integer, Integer) -> Boolean
*	~	Mul: (Integer, Integer) -> Integer
>=	~	Ge: (Integer, Integer) -> Boolean
-1	~	UnaryMinus: (Integer) -> Integer
\|	~	Bwor: (Integer, Integer) -> Integer
/	~	Div: (Integer, Integer) -> Integer
=	~	Eq: (Integer, Integer) -> Boolean
	~	Bwxor: (Integer, Integer) -> Integer
\|\|	~	Lor: (Boolean, Boolean) -> Boolean
!	~	Lnot: (Boolean) -> Boolean
<	~	Lt: (Integer, Integer) -> Boolean
-	~	Sub: (Integer, Integer) -> Integer
<=	~	Le: (Integer, Integer) -> Boolean
>	~	Gt: (Integer, Integer) -> Boolean
~	~	Bwnot: (Integer) -> Integer
%	~	Mod: (Integer, Integer) -> Integer
&	~	Bwand: (Integer, Integer) -> Integer
+	~	Add: (Integer, Integer) -> Integer
&&	~	Land: (Boolean, Boolean) -> Boolean

The TRS R consists of the following rules:
Load681(i14, i20) → Cond_Load681(i14 > i20, i14, i20)
Cond_Load681(TRUE, i14, i20) → Load681(i20, i14)
The set Q consists of the following terms:
Load681(x0, x1)
Cond_Load681(TRUE, x0, x1)

(5) ITRStoIDPProof (EQUIVALENT transformation)

Added dependency pairs

(6) Obligation:

IDP problem:
The following function symbols are pre-defined:

!=	~	Neq: (Integer, Integer) -> Boolean
*	~	Mul: (Integer, Integer) -> Integer
>=	~	Ge: (Integer, Integer) -> Boolean
-1	~	UnaryMinus: (Integer) -> Integer
\|	~	Bwor: (Integer, Integer) -> Integer
/	~	Div: (Integer, Integer) -> Integer
=	~	Eq: (Integer, Integer) -> Boolean
	~	Bwxor: (Integer, Integer) -> Integer
\|\|	~	Lor: (Boolean, Boolean) -> Boolean
!	~	Lnot: (Boolean) -> Boolean
<	~	Lt: (Integer, Integer) -> Boolean
-	~	Sub: (Integer, Integer) -> Integer
<=	~	Le: (Integer, Integer) -> Boolean
>	~	Gt: (Integer, Integer) -> Boolean
~	~	Bwnot: (Integer) -> Integer
%	~	Mod: (Integer, Integer) -> Integer
&	~	Bwand: (Integer, Integer) -> Integer
+	~	Add: (Integer, Integer) -> Integer
&&	~	Land: (Boolean, Boolean) -> Boolean

The following domains are used:

Integer

The ITRS R consists of the following rules:
Load681(i14, i20) → Cond_Load681(i14 > i20, i14, i20)
Cond_Load681(TRUE, i14, i20) → Load681(i20, i14)

The integer pair graph contains the following rules and edges:
(0): LOAD681(i14[0], i20[0]) → COND_LOAD681(i14[0] > i20[0], i14[0], i20[0])
(1): COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1])

(0) -> (1), if ((i14[0] →^* i14[1])∧(i20[0] →^* i20[1])∧(i14[0] > i20[0] →^* TRUE))

(1) -> (0), if ((i20[1] →^* i14[0])∧(i14[1] →^* i20[0]))

The set Q consists of the following terms:
Load681(x0, x1)
Cond_Load681(TRUE, x0, x1)

(7) UsableRulesProof (EQUIVALENT transformation)

As all Q-normal forms are R-normal forms we are in the innermost case. Hence, by the usable rules processor [LPAR04] we can delete all non-usable rules [FROCOS05] from R.

(8) Obligation:

IDP problem:
The following function symbols are pre-defined:

!=	~	Neq: (Integer, Integer) -> Boolean
*	~	Mul: (Integer, Integer) -> Integer
>=	~	Ge: (Integer, Integer) -> Boolean
-1	~	UnaryMinus: (Integer) -> Integer
\|	~	Bwor: (Integer, Integer) -> Integer
/	~	Div: (Integer, Integer) -> Integer
=	~	Eq: (Integer, Integer) -> Boolean
	~	Bwxor: (Integer, Integer) -> Integer
\|\|	~	Lor: (Boolean, Boolean) -> Boolean
!	~	Lnot: (Boolean) -> Boolean
<	~	Lt: (Integer, Integer) -> Boolean
-	~	Sub: (Integer, Integer) -> Integer
<=	~	Le: (Integer, Integer) -> Boolean
>	~	Gt: (Integer, Integer) -> Boolean
~	~	Bwnot: (Integer) -> Integer
%	~	Mod: (Integer, Integer) -> Integer
&	~	Bwand: (Integer, Integer) -> Integer
+	~	Add: (Integer, Integer) -> Integer
&&	~	Land: (Boolean, Boolean) -> Boolean

The following domains are used:

Integer

R is empty.

The integer pair graph contains the following rules and edges:
(0): LOAD681(i14[0], i20[0]) → COND_LOAD681(i14[0] > i20[0], i14[0], i20[0])
(1): COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1])

(0) -> (1), if ((i14[0] →^* i14[1])∧(i20[0] →^* i20[1])∧(i14[0] > i20[0] →^* TRUE))

(1) -> (0), if ((i20[1] →^* i14[0])∧(i14[1] →^* i20[0]))

The set Q consists of the following terms:
Load681(x0, x1)
Cond_Load681(TRUE, x0, x1)

(9) IDPNonInfProof (SOUND transformation)

The constraints were generated the following way:
The DP Problem is simplified using the Induction Calculus [NONINF] with the following steps:
Note that final constraints are written in bold face.

For Pair LOAD681(i14, i20) → COND_LOAD681(>(i14, i20), i14, i20) the following chains were created:

We consider the chain COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1]), LOAD681(i14[0], i20[0]) → COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0]), COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1]) which results in the following constraint:
(1)    (i20[1]=i14[0]∧i14[1]=i20[0]∧i14[0]=i14[1]1∧i20[0]=i20[1]1∧>(i14[0], i20[0])=TRUE ⇒ LOAD681(i14[0], i20[0])≥NonInfC∧LOAD681(i14[0], i20[0])≥COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])∧(U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥))

We simplified constraint (1) using rules (III), (IV) which results in the following new constraint:
(2)    (>(i14[0], i20[0])=TRUE ⇒ LOAD681(i14[0], i20[0])≥NonInfC∧LOAD681(i14[0], i20[0])≥COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])∧(U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥))

We simplified constraint (2) using rule (POLY_CONSTRAINTS) which results in the following new constraint:
(3)    (i14[0] + [-1] + [-1]i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)bni_11 + (-1)Bound*bni_11] + [(-1)bni_11]i20[0] + [bni_11]i14[0] ≥ 0∧[-1 + (-1)bso_12] + [-2]i20[0] + [2]i14[0] ≥ 0)

We simplified constraint (3) using rule (IDP_POLY_SIMPLIFY) which results in the following new constraint:
(4)    (i14[0] + [-1] + [-1]i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)bni_11 + (-1)Bound*bni_11] + [(-1)bni_11]i20[0] + [bni_11]i14[0] ≥ 0∧[-1 + (-1)bso_12] + [-2]i20[0] + [2]i14[0] ≥ 0)

We simplified constraint (4) using rule (POLY_REMOVE_MIN_MAX) which results in the following new constraint:
(5)    (i14[0] + [-1] + [-1]i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)bni_11 + (-1)Bound*bni_11] + [(-1)bni_11]i20[0] + [bni_11]i14[0] ≥ 0∧[-1 + (-1)bso_12] + [-2]i20[0] + [2]i14[0] ≥ 0)

We simplified constraint (5) using rule (IDP_SMT_SPLIT) which results in the following new constraint:
(6)    (i14[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)Bound*bni_11] + [bni_11]i14[0] ≥ 0∧[1 + (-1)bso_12] + [2]i14[0] ≥ 0)

We simplified constraint (6) using rule (IDP_SMT_SPLIT) which results in the following new constraints:
(7)    (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)Bound*bni_11] + [bni_11]i14[0] ≥ 0∧[1 + (-1)bso_12] + [2]i14[0] ≥ 0)

(8)    (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)Bound*bni_11] + [bni_11]i14[0] ≥ 0∧[1 + (-1)bso_12] + [2]i14[0] ≥ 0)

For Pair COND_LOAD681(TRUE, i14, i20) → LOAD681(i20, i14) the following chains were created:

We consider the chain LOAD681(i14[0], i20[0]) → COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0]), COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1]), LOAD681(i14[0], i20[0]) → COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0]) which results in the following constraint:
(9)    (i14[0]=i14[1]∧i20[0]=i20[1]∧>(i14[0], i20[0])=TRUE∧i20[1]=i14[0]1∧i14[1]=i20[0]1 ⇒ COND_LOAD681(TRUE, i14[1], i20[1])≥NonInfC∧COND_LOAD681(TRUE, i14[1], i20[1])≥LOAD681(i20[1], i14[1])∧(U^Increasing(LOAD681(i20[1], i14[1])), ≥))

We simplified constraint (9) using rules (III), (IV) which results in the following new constraint:
(10)    (>(i14[0], i20[0])=TRUE ⇒ COND_LOAD681(TRUE, i14[0], i20[0])≥NonInfC∧COND_LOAD681(TRUE, i14[0], i20[0])≥LOAD681(i20[0], i14[0])∧(U^Increasing(LOAD681(i20[1], i14[1])), ≥))

We simplified constraint (10) using rule (POLY_CONSTRAINTS) which results in the following new constraint:
(11)    (i14[0] + [-1] + [-1]i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13] + [bni_13]i20[0] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

We simplified constraint (11) using rule (IDP_POLY_SIMPLIFY) which results in the following new constraint:
(12)    (i14[0] + [-1] + [-1]i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13] + [bni_13]i20[0] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

We simplified constraint (12) using rule (POLY_REMOVE_MIN_MAX) which results in the following new constraint:
(13)    (i14[0] + [-1] + [-1]i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13] + [bni_13]i20[0] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

We simplified constraint (13) using rule (IDP_SMT_SPLIT) which results in the following new constraint:
(14)    (i14[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13 + (-1)bni_13] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

We simplified constraint (14) using rule (IDP_SMT_SPLIT) which results in the following new constraints:
(15)    (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13 + (-1)bni_13] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

(16)    (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13 + (-1)bni_13] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

To summarize, we get the following constraints P_≥ for the following pairs.

LOAD681(i14, i20) → COND_LOAD681(>(i14, i20), i14, i20)
- (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)Bound*bni_11] + [bni_11]i14[0] ≥ 0∧[1 + (-1)bso_12] + [2]i14[0] ≥ 0)
- (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])), ≥)∧[(-1)Bound*bni_11] + [bni_11]i14[0] ≥ 0∧[1 + (-1)bso_12] + [2]i14[0] ≥ 0)
COND_LOAD681(TRUE, i14, i20) → LOAD681(i20, i14)
- (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13 + (-1)bni_13] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)
- (i14[0] ≥ 0∧i20[0] ≥ 0 ⇒ (U^Increasing(LOAD681(i20[1], i14[1])), ≥)∧[(-1)Bound*bni_13 + (-1)bni_13] + [(-1)bni_13]i14[0] ≥ 0∧[1 + (-1)bso_14] ≥ 0)

The constraints for P_> respective P_bound are constructed from P_≥ where we just replace every occurence of "t ≥ s" in P_≥ by "t > s" respective "t ≥ c". Here c stands for the fresh constant used for P_bound.
Using the following integer polynomial ordering the resulting constraints can be solved
Polynomial interpretation over integers[POLO]:

POL(TRUE) = 0
POL(FALSE) = 0
POL(LOAD681(x₁, x₂)) = [-1] + [-1]x₂ + x₁
POL(COND_LOAD681(x₁, x₂, x₃)) = x₃ + [-1]x₂
POL(>(x₁, x₂)) = [1]

The following pairs are in P_>:

LOAD681(i14[0], i20[0]) → COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])
COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1])

The following pairs are in P_bound:

LOAD681(i14[0], i20[0]) → COND_LOAD681(>(i14[0], i20[0]), i14[0], i20[0])

The following pairs are in P_≥:
none

There are no usable rules.

(10) Complex Obligation (AND)

(11) Obligation:

IDP problem:
The following function symbols are pre-defined:

!=	~	Neq: (Integer, Integer) -> Boolean
*	~	Mul: (Integer, Integer) -> Integer
>=	~	Ge: (Integer, Integer) -> Boolean
-1	~	UnaryMinus: (Integer) -> Integer
\|	~	Bwor: (Integer, Integer) -> Integer
/	~	Div: (Integer, Integer) -> Integer
=	~	Eq: (Integer, Integer) -> Boolean
	~	Bwxor: (Integer, Integer) -> Integer
\|\|	~	Lor: (Boolean, Boolean) -> Boolean
!	~	Lnot: (Boolean) -> Boolean
<	~	Lt: (Integer, Integer) -> Boolean
-	~	Sub: (Integer, Integer) -> Integer
<=	~	Le: (Integer, Integer) -> Boolean
>	~	Gt: (Integer, Integer) -> Boolean
~	~	Bwnot: (Integer) -> Integer
%	~	Mod: (Integer, Integer) -> Integer
&	~	Bwand: (Integer, Integer) -> Integer
+	~	Add: (Integer, Integer) -> Integer
&&	~	Land: (Boolean, Boolean) -> Boolean

The following domains are used:
none

R is empty.

The integer pair graph is empty.

The set Q consists of the following terms:
Load681(x0, x1)
Cond_Load681(TRUE, x0, x1)

(12) IDependencyGraphProof (EQUIVALENT transformation)

The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 0 SCCs.

(13) TRUE

(14) Obligation:

IDP problem:
The following function symbols are pre-defined:

!=	~	Neq: (Integer, Integer) -> Boolean
*	~	Mul: (Integer, Integer) -> Integer
>=	~	Ge: (Integer, Integer) -> Boolean
-1	~	UnaryMinus: (Integer) -> Integer
\|	~	Bwor: (Integer, Integer) -> Integer
/	~	Div: (Integer, Integer) -> Integer
=	~	Eq: (Integer, Integer) -> Boolean
	~	Bwxor: (Integer, Integer) -> Integer
\|\|	~	Lor: (Boolean, Boolean) -> Boolean
!	~	Lnot: (Boolean) -> Boolean
<	~	Lt: (Integer, Integer) -> Boolean
-	~	Sub: (Integer, Integer) -> Integer
<=	~	Le: (Integer, Integer) -> Boolean
>	~	Gt: (Integer, Integer) -> Boolean
~	~	Bwnot: (Integer) -> Integer
%	~	Mod: (Integer, Integer) -> Integer
&	~	Bwand: (Integer, Integer) -> Integer
+	~	Add: (Integer, Integer) -> Integer
&&	~	Land: (Boolean, Boolean) -> Boolean

The following domains are used:
none

R is empty.

The integer pair graph contains the following rules and edges:
(1): COND_LOAD681(TRUE, i14[1], i20[1]) → LOAD681(i20[1], i14[1])

The set Q consists of the following terms:
Load681(x0, x1)
Cond_Load681(TRUE, x0, x1)

(15) IDependencyGraphProof (EQUIVALENT transformation)

The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 0 SCCs with 1 less node.

(0) Obligation:

(1) JBC2FIG (SOUND transformation)

(2) Obligation:

(3) FIGtoITRSProof (SOUND transformation)

(4) Obligation:

(5) ITRStoIDPProof (EQUIVALENT transformation)

(6) Obligation:

(7) UsableRulesProof (EQUIVALENT transformation)

(8) Obligation:

(9) IDPNonInfProof (SOUND transformation)

(10) Complex Obligation (AND)

(11) Obligation:

(12) IDependencyGraphProof (EQUIVALENT transformation)

(13) TRUE

(14) Obligation:

(15) IDependencyGraphProof (EQUIVALENT transformation)

(16) TRUE