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Java Bytec 64199 pair #381919532
details
property
value
status
complete
benchmark
ex01_rec.jar
ran by
Akihisa Yamada
cpu timeout
1200 seconds
wallclock timeout
300 seconds
memory limit
137438953472 bytes
execution host
n028.star.cs.uiowa.edu
space
Julia_12_recursive
run statistics
property
value
solver
AProVE
configuration
standard
runtime (wallclock)
2.24052786827 seconds
cpu usage
5.551245049
max memory
5.18078464E8
stage attributes
key
value
output-size
2482
starexec-result
NO
output
/export/starexec/sandbox/solver/bin/starexec_run_standard /export/starexec/sandbox/benchmark/theBenchmark.jar /export/starexec/sandbox/output/output_files -------------------------------------------------------------------------------- NO proof of /export/starexec/sandbox/benchmark/theBenchmark.jar # AProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty termination of the given Bare JBC problem could be disproven: (0) Bare JBC problem (1) BareJBCToJBCProof [EQUIVALENT, 93 ms] (2) JBC problem (3) JBCNonTerm [COMPLETE, 287 ms] (4) NO ---------------------------------------- (0) Obligation: need to prove termination of the following program: public class Ex01 { public static void loop(int i) { if (i < 0) loop(i - 1); } public static void main(String[] args) { loop(-1 * args.length); } } ---------------------------------------- (1) BareJBCToJBCProof (EQUIVALENT) initialized classpath ---------------------------------------- (2) Obligation: need to prove termination of the following program: public class Ex01 { public static void loop(int i) { if (i < 0) loop(i - 1); } public static void main(String[] args) { loop(-1 * args.length); } } ---------------------------------------- (3) JBCNonTerm (COMPLETE) Reached a loop using the following run: 0:<Ex01.main||0: push -1||#0: a2|| -> a2([java.lang.String...]): length 1 -->{java.lang.Object...} YES: (JL1) 1:<Ex01.main||1: load ADDR #0||#0: a2||-1> a2([java.lang.String...]): length 1 -->{java.lang.Object...} YES: (JL1) 2:<Ex01.main||2: arraylength|| - ||-1, a2> a2([java.lang.String...]): length 1 -->{java.lang.Object...} YES: (JL1) 3:<Ex01.main||3: MUL|| - ||-1, 1> YES: (JL1) 4:<Ex01.main||4: Ex01.loop(I)V|| - ||-1> YES: (JL1) 5:<Ex01.loop||0: load INT #0||#0: -1|| -> YES: (JL1) Start state of loop: [i4(lv_0_0)] <Ex01.loop||0: load INT #0||#0: i4|| -> i4: (-inf,0]{-inf,+inf} YES: (JL1) In the loop head node, references [i4] were interesting. All methods calls in the loop body are side-effect free, hence they can be ignored. By SMT, we could prove (initial_i4 <= 0 and (((path1_i4 = path1_i7 and path1_i15 = (path1_i7 - 1) and path1_i15 = res_i4 and path1_i4 = initial_i4) and path1_i7 < 0) and ((res1_i4 = res1_i7 and res1_i15 = (res1_i7 - 1) and res_i4 = res1_i4) and !res1_i7 < 0))) to be UNSAT. Consequently, the loop will not terminate. ---------------------------------------- (4)
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