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package io.github.lantalex.mm;
import org.openjdk.jcstress.annotations.Actor;
import org.openjdk.jcstress.annotations.JCStressTest;
import org.openjdk.jcstress.annotations.Outcome;
import org.openjdk.jcstress.annotations.State;
import org.openjdk.jcstress.infra.results.IIII_Result;
import static org.openjdk.jcstress.annotations.Expect.*;
@JCStressTest
@Outcome(expect = ACCEPTABLE, desc = "Expected boring case")
@Outcome(id = "1, 2, 2, 1", expect = ACCEPTABLE_INTERESTING, desc = "Violation of coherence")
@Outcome(id = "2, 1, 1, 2", expect = ACCEPTABLE_INTERESTING, desc = "Violation of coherence")
@State
public class Java_Coherence {
/*
Trick with variable aliases and trap was stolen from: https://github.com/openjdk/jcstress/blob/master/jcstress-samples/src/main/java/org/openjdk/jcstress/samples/jmm/basic/BasicJMM_05_Coherence.java
How to run:
$ ./gradlew jcstress --tests "Java_Coherence"
Results(x86):
----------------------------------------------------------------
RESULT SAMPLES FREQ EXPECT DESCRIPTION
0, 0, 0, 0 125,759,771 12.94% Acceptable Expected boring case
0, 0, 0, 1 61,805 <0.01% Acceptable Expected boring case
0, 0, 0, 2 59,873 <0.01% Acceptable Expected boring case
0, 0, 1, 0 59,929 <0.01% Acceptable Expected boring case
0, 0, 1, 1 109,156,191 11.23% Acceptable Expected boring case
0, 0, 1, 2 122,097 0.01% Acceptable Expected boring case
0, 0, 2, 0 58,895 <0.01% Acceptable Expected boring case
0, 0, 2, 1 117,118 0.01% Acceptable Expected boring case
0, 0, 2, 2 107,081,883 11.01% Acceptable Expected boring case
0, 1, 0, 0 111,201 0.01% Acceptable Expected boring case
0, 1, 0, 1 120 <0.01% Acceptable Expected boring case
0, 1, 0, 2 19 <0.01% Acceptable Expected boring case
0, 1, 1, 0 292 <0.01% Acceptable Expected boring case
0, 1, 1, 1 32,608 <0.01% Acceptable Expected boring case
0, 1, 1, 2 105 <0.01% Acceptable Expected boring case
0, 1, 2, 0 58 <0.01% Acceptable Expected boring case
0, 1, 2, 1 193 <0.01% Acceptable Expected boring case
0, 1, 2, 2 56,442 <0.01% Acceptable Expected boring case
0, 2, 0, 0 108,554 0.01% Acceptable Expected boring case
0, 2, 0, 1 32 <0.01% Acceptable Expected boring case
0, 2, 0, 2 111 <0.01% Acceptable Expected boring case
0, 2, 1, 0 61 <0.01% Acceptable Expected boring case
0, 2, 1, 1 53,846 <0.01% Acceptable Expected boring case
0, 2, 1, 2 202 <0.01% Acceptable Expected boring case
0, 2, 2, 0 276 <0.01% Acceptable Expected boring case
0, 2, 2, 1 105 <0.01% Acceptable Expected boring case
0, 2, 2, 2 30,872 <0.01% Acceptable Expected boring case
1, 0, 0, 0 40,926 <0.01% Acceptable Expected boring case
1, 0, 0, 1 110 <0.01% Acceptable Expected boring case
1, 0, 0, 2 8 <0.01% Acceptable Expected boring case
1, 0, 1, 1 17,506 <0.01% Acceptable Expected boring case
1, 0, 1, 2 62 <0.01% Acceptable Expected boring case
1, 0, 2, 1 6 <0.01% Acceptable Expected boring case
1, 0, 2, 2 28,506 <0.01% Acceptable Expected boring case
1, 1, 0, 0 88,441,435 9.10% Acceptable Expected boring case
1, 1, 0, 1 23,895 <0.01% Acceptable Expected boring case
1, 1, 0, 2 30,825 <0.01% Acceptable Expected boring case
1, 1, 1, 0 20,717 <0.01% Acceptable Expected boring case
1, 1, 1, 1 148,969,113 15.32% Acceptable Expected boring case
1, 1, 1, 2 80,521 <0.01% Acceptable Expected boring case
1, 1, 2, 0 33,481 <0.01% Acceptable Expected boring case
1, 1, 2, 1 76,364 <0.01% Acceptable Expected boring case
1, 1, 2, 2 76,205,555 7.84% Acceptable Expected boring case
1, 2, 0, 0 126,582 0.01% Acceptable Expected boring case
1, 2, 0, 1 74 <0.01% Acceptable Expected boring case
1, 2, 0, 2 88 <0.01% Acceptable Expected boring case
1, 2, 1, 0 258 <0.01% Acceptable Expected boring case
1, 2, 1, 1 90,997 <0.01% Acceptable Expected boring case
1, 2, 1, 2 618 <0.01% Acceptable Expected boring case
1, 2, 2, 0 18 <0.01% Acceptable Expected boring case
----> 1, 2, 2, 1 1,931 <0.01% Interesting Violation of coherence
1, 2, 2, 2 91,294 <0.01% Acceptable Expected boring case
2, 0, 0, 0 40,386 <0.01% Acceptable Expected boring case
2, 0, 0, 1 19 <0.01% Acceptable Expected boring case
2, 0, 0, 2 128 <0.01% Acceptable Expected boring case
2, 0, 1, 1 28,512 <0.01% Acceptable Expected boring case
2, 0, 1, 2 9 <0.01% Acceptable Expected boring case
2, 0, 2, 1 62 <0.01% Acceptable Expected boring case
2, 0, 2, 2 16,473 <0.01% Acceptable Expected boring case
2, 1, 0, 0 127,564 0.01% Acceptable Expected boring case
2, 1, 0, 1 96 <0.01% Acceptable Expected boring case
2, 1, 0, 2 71 <0.01% Acceptable Expected boring case
2, 1, 1, 0 26 <0.01% Acceptable Expected boring case
2, 1, 1, 1 88,662 <0.01% Acceptable Expected boring case
----> 2, 1, 1, 2 1,818 <0.01% Interesting Violation of coherence
2, 1, 2, 0 219 <0.01% Acceptable Expected boring case
2, 1, 2, 1 550 <0.01% Acceptable Expected boring case
2, 1, 2, 2 88,678 <0.01% Acceptable Expected boring case
2, 2, 0, 0 85,848,997 8.83% Acceptable Expected boring case
2, 2, 0, 1 30,653 <0.01% Acceptable Expected boring case
2, 2, 0, 2 22,716 <0.01% Acceptable Expected boring case
2, 2, 1, 0 33,590 <0.01% Acceptable Expected boring case
2, 2, 1, 1 75,234,175 7.74% Acceptable Expected boring case
2, 2, 1, 2 75,607 <0.01% Acceptable Expected boring case
2, 2, 2, 0 19,863 <0.01% Acceptable Expected boring case
2, 2, 2, 1 81,702 <0.01% Acceptable Expected boring case
2, 2, 2, 2 153,275,243 15.77% Acceptable Expected boring case
Results(arm_v8):
----------------------------------------------------------------
RESULT SAMPLES FREQ EXPECT DESCRIPTION
0, 0, 0, 0 79,541 0.16% Acceptable Expected boring case
0, 0, 0, 1 19 <0.01% Acceptable Expected boring case
0, 0, 0, 2 20 <0.01% Acceptable Expected boring case
0, 0, 1, 0 773 <0.01% Acceptable Expected boring case
0, 0, 1, 1 47,437 0.09% Acceptable Expected boring case
0, 0, 1, 2 101 <0.01% Acceptable Expected boring case
0, 0, 2, 0 797 <0.01% Acceptable Expected boring case
0, 0, 2, 1 43 <0.01% Acceptable Expected boring case
0, 0, 2, 2 43,054 0.08% Acceptable Expected boring case
0, 1, 0, 0 445 <0.01% Acceptable Expected boring case
0, 1, 1, 0 50 <0.01% Acceptable Expected boring case
0, 1, 1, 1 965 <0.01% Acceptable Expected boring case
0, 1, 1, 2 6 <0.01% Acceptable Expected boring case
0, 1, 2, 0 31 <0.01% Acceptable Expected boring case
0, 1, 2, 1 3 <0.01% Acceptable Expected boring case
0, 1, 2, 2 513 <0.01% Acceptable Expected boring case
0, 2, 0, 0 337 <0.01% Acceptable Expected boring case
0, 2, 1, 0 20 <0.01% Acceptable Expected boring case
0, 2, 1, 1 566 <0.01% Acceptable Expected boring case
0, 2, 1, 2 6 <0.01% Acceptable Expected boring case
0, 2, 2, 0 50 <0.01% Acceptable Expected boring case
0, 2, 2, 1 1 <0.01% Acceptable Expected boring case
0, 2, 2, 2 827 <0.01% Acceptable Expected boring case
1, 0, 0, 0 194 <0.01% Acceptable Expected boring case
1, 0, 1, 0 6 <0.01% Acceptable Expected boring case
1, 0, 1, 1 329 <0.01% Acceptable Expected boring case
1, 0, 2, 0 7 <0.01% Acceptable Expected boring case
1, 0, 2, 2 159 <0.01% Acceptable Expected boring case
1, 1, 0, 0 46,630 0.09% Acceptable Expected boring case
1, 1, 0, 1 95 <0.01% Acceptable Expected boring case
1, 1, 0, 2 75 <0.01% Acceptable Expected boring case
1, 1, 1, 0 1,467 <0.01% Acceptable Expected boring case
1, 1, 1, 1 27,864,246 54.89% Acceptable Expected boring case
1, 1, 1, 2 700 <0.01% Acceptable Expected boring case
1, 1, 2, 0 842 <0.01% Acceptable Expected boring case
1, 1, 2, 1 345 <0.01% Acceptable Expected boring case
1, 1, 2, 2 134,663 0.27% Acceptable Expected boring case
1, 2, 0, 0 33 <0.01% Acceptable Expected boring case
1, 2, 0, 2 1 <0.01% Acceptable Expected boring case
1, 2, 1, 0 4 <0.01% Acceptable Expected boring case
1, 2, 1, 1 98 <0.01% Acceptable Expected boring case
1, 2, 1, 2 3 <0.01% Acceptable Expected boring case
1, 2, 2, 0 3 <0.01% Acceptable Expected boring case
----> 1, 2, 2, 1 9 <0.01% Interesting Violation of coherence
1, 2, 2, 2 167 <0.01% Acceptable Expected boring case
2, 0, 0, 0 158 <0.01% Acceptable Expected boring case
2, 0, 0, 1 1 <0.01% Acceptable Expected boring case
2, 0, 0, 2 1 <0.01% Acceptable Expected boring case
2, 0, 1, 0 1 <0.01% Acceptable Expected boring case
2, 0, 1, 1 163 <0.01% Acceptable Expected boring case
2, 0, 2, 0 8 <0.01% Acceptable Expected boring case
2, 0, 2, 1 1 <0.01% Acceptable Expected boring case
2, 0, 2, 2 272 <0.01% Acceptable Expected boring case
2, 1, 0, 0 29 <0.01% Acceptable Expected boring case
2, 1, 0, 2 2 <0.01% Acceptable Expected boring case
2, 1, 1, 0 1 <0.01% Acceptable Expected boring case
2, 1, 1, 1 202 <0.01% Acceptable Expected boring case
----> 2, 1, 1, 2 11 <0.01% Interesting Violation of coherence
2, 1, 2, 0 4 <0.01% Acceptable Expected boring case
2, 1, 2, 1 9 <0.01% Acceptable Expected boring case
2, 1, 2, 2 120 <0.01% Acceptable Expected boring case
2, 2, 0, 0 43,568 0.09% Acceptable Expected boring case
2, 2, 0, 1 41 <0.01% Acceptable Expected boring case
2, 2, 0, 2 91 <0.01% Acceptable Expected boring case
2, 2, 1, 0 684 <0.01% Acceptable Expected boring case
2, 2, 1, 1 123,134 0.24% Acceptable Expected boring case
2, 2, 1, 2 388 <0.01% Acceptable Expected boring case
2, 2, 2, 0 1,615 <0.01% Acceptable Expected boring case
2, 2, 2, 1 264 <0.01% Acceptable Expected boring case
2, 2, 2, 2 22,367,479 44.06% Acceptable Expected boring case
*/
private final Holder h1 = new Holder();
private final Holder h2 = h1;
@Actor
public void actorW0() {
h1.x = 1;
}
@Actor
public void actorW1() {
h2.x = 2;
}
@Actor
public void actorR2(IIII_Result r) {
Holder ref1 = this.h1;
Holder ref2 = this.h2;
ref1.trap = 0;
ref2.trap = 0;
r.r1 = ref1.x;
r.r2 = ref2.x;
}
@Actor
public void actorR3(IIII_Result r) {
Holder ref2 = this.h2;
Holder ref1 = this.h1;
ref2.trap = 0;
ref1.trap = 0;
r.r3 = ref1.x;
r.r4 = ref2.x;
}
private static class Holder {
int x;
int trap;
}
}