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make desugar dependencies deterministic
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Desugar dependencies are added to the result jar file as metadata, this desugar dependency object contains a few lists that we found out the order of this list can be different in different builds with the same inputs, therefore the final result will have a different hash and it cause cache miss in the builds solution is to make the lists in this object sorted. So for the same input, we always get the same output

Closes bazelbuild#16859.

PiperOrigin-RevId: 500842557
Change-Id: I051e74e7147d590fcfe5cda9731b8e012396bb65
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@mohamadk
mohamadk authored and Copybara-Service committed Jan 10, 2023
1 parent 88c426e commit a306f4f
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Showing 2 changed files with 100 additions and 46 deletions.
83 changes: 48 additions & 35 deletions ...st/java/com/google/devtools/build/android/desugar/dependencies/MetadataCollectorTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,14 +13,13 @@
// limitations under the License.
package com.google.devtools.build.android.desugar.dependencies;

import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableList;
import com.google.devtools.build.android.desugar.proto.DesugarDeps;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.Dependency;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.DesugarDepsInfo;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.InterfaceDetails;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.InterfaceWithCompanion;
import java.util.Arrays;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
Expand All @@ -42,65 +41,79 @@ public void testAssumeCompanionClass() throws Exception {
collector.assumeCompanionClass("a", "a$$CC");

DesugarDepsInfo info = extractProto(collector);

assertThat(info.getAssumePresentList())
.containsExactly(
Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("b$$CC")).build(),
Dependency.newBuilder().setOrigin(wrapType("b")).setTarget(wrapType("b$$CC")).build(),
Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("a$$CC")).build());
dependency("a", "a$$CC"), dependency("a", "b$$CC"), dependency("b", "b$$CC"));
}

@Test
public void testMissingImplementedInterface() throws Exception {
MetadataCollector collector = new MetadataCollector(true);
collector.missingImplementedInterface("a", "b");
collector.missingImplementedInterface("a", "c");
collector.missingImplementedInterface("c", "b");
collector.missingImplementedInterface("a", "c");

DesugarDepsInfo info = extractProto(collector);
assertThat(info.getMissingInterfaceList())
.containsExactly(
Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("b")).build(),
Dependency.newBuilder().setOrigin(wrapType("a")).setTarget(wrapType("c")).build(),
Dependency.newBuilder().setOrigin(wrapType("c")).setTarget(wrapType("b")).build());
assertThat(info.getMissingInterfaceList().get(0)).isEqualTo(dependency("a", "b"));
assertThat(info.getMissingInterfaceList().get(1)).isEqualTo(dependency("a", "c"));
assertThat(info.getMissingInterfaceList().get(2)).isEqualTo(dependency("c", "b"));
}

@Test
public void testRecordExtendedInterfaces() throws Exception {
MetadataCollector collector = new MetadataCollector(false);
collector.recordExtendedInterfaces("a", "b", "c");
collector.recordExtendedInterfaces("b");
collector.recordExtendedInterfaces("c", "d");
collector.recordExtendedInterfaces("a", "c", "b");
collector.recordExtendedInterfaces("b");

DesugarDepsInfo info = extractProto(collector);
assertThat(info.getInterfaceWithSupertypesList())
.containsExactly(
InterfaceDetails.newBuilder()
.setOrigin(wrapType("a"))
.addAllExtendedInterface(ImmutableList.of(wrapType("b"), wrapType("c")))
.build(),
InterfaceDetails.newBuilder()
.setOrigin(wrapType("c"))
.addAllExtendedInterface(ImmutableList.of(wrapType("d")))
.build());

assertThat(info.getInterfaceWithSupertypesList().get(0))
.isEqualTo(interfaceDetails("a", "b", "c"));
assertThat(info.getInterfaceWithSupertypesList().get(0).getExtendedInterfaceList().get(0))
.isEqualTo(wrapType("b"));
assertThat(info.getInterfaceWithSupertypesList().get(0).getExtendedInterfaceList().get(1))
.isEqualTo(wrapType("c"));

assertThat(info.getInterfaceWithSupertypesList().get(1)).isEqualTo(interfaceDetails("c", "d"));
}

@Test
public void testRecordDefaultMethods() throws Exception {
MetadataCollector collector = new MetadataCollector(false);
collector.recordDefaultMethods("a", 0);
collector.recordDefaultMethods("b", 1);
collector.recordDefaultMethods("a", 0);

DesugarDepsInfo info = extractProto(collector);
assertThat(info.getInterfaceWithCompanionList())
.containsExactly(
InterfaceWithCompanion.newBuilder()
.setOrigin(wrapType("a"))
.setNumDefaultMethods(0)
.build(),
InterfaceWithCompanion.newBuilder()
.setOrigin(wrapType("b"))
.setNumDefaultMethods(1)
.build());
assertThat(info.getInterfaceWithCompanionList().get(0))
.isEqualTo(interfaceWithCompanion("a", 0));
assertThat(info.getInterfaceWithCompanionList().get(1))
.isEqualTo(interfaceWithCompanion("b", 1));
}

private DesugarDeps.InterfaceWithCompanion interfaceWithCompanion(String origin, int count) {
return DesugarDeps.InterfaceWithCompanion.newBuilder()
.setOrigin(wrapType(origin))
.setNumDefaultMethods(count)
.build();
}

private DesugarDeps.InterfaceDetails interfaceDetails(String originName, String... interfaces) {
return InterfaceDetails.newBuilder()
.setOrigin(wrapType(originName))
.addAllExtendedInterface(
Arrays.stream(interfaces)
.map(MetadataCollectorTest::wrapType)
.collect(toImmutableList()))
.build();
}

private DesugarDeps.Dependency dependency(String origin, String target) {
return DesugarDeps.Dependency.newBuilder()
.setOrigin(wrapType(origin))
.setTarget(wrapType(target))
.build();
}

private static DesugarDeps.Type wrapType(String name) {
Expand Down
63 changes: 52 additions & 11 deletions ...ndroid/java/com/google/devtools/build/android/desugar/dependencies/MetadataCollector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,13 +22,21 @@
import com.google.devtools.build.android.desugar.proto.DesugarDeps.InterfaceDetails;
import com.google.devtools.build.android.desugar.proto.DesugarDeps.InterfaceWithCompanion;
import com.google.devtools.build.android.r8.DependencyCollector;
import java.util.ArrayList;
import java.util.Comparator;
import javax.annotation.Nullable;

/** Dependency collector that emits collected metadata as a {@link DesugarDepsInfo} proto. */
public final class MetadataCollector implements DependencyCollector {

private final boolean tolerateMissingDeps;
private final DesugarDepsInfo.Builder info = DesugarDeps.DesugarDepsInfo.newBuilder();

private final ArrayList<DesugarDeps.Dependency> assumePresents = new ArrayList<>();
private final ArrayList<DesugarDeps.Dependency> missingInterfaces = new ArrayList<>();
private final ArrayList<DesugarDeps.InterfaceDetails> interfacesWithSupertypes =
new ArrayList<>();
private final ArrayList<DesugarDeps.InterfaceWithCompanion> interfacesWithCompanion =
new ArrayList<>();

public MetadataCollector(boolean tolerateMissingDeps) {
this.tolerateMissingDeps = tolerateMissingDeps;
Expand All @@ -43,8 +51,8 @@ private static boolean isInterfaceCompanionClass(String name) {
public void assumeCompanionClass(String origin, String target) {
checkArgument(
isInterfaceCompanionClass(target), "target not a companion: %s -> %s", origin, target);
info.addAssumePresent(
Dependency.newBuilder().setOrigin(wrapType(origin)).setTarget(wrapType(target)));
assumePresents.add(
Dependency.newBuilder().setOrigin(wrapType(origin)).setTarget(wrapType(target)).build());
}

@Override
Expand All @@ -59,37 +67,70 @@ public void missingImplementedInterface(String origin, String target) {
"Couldn't find interface %s on the classpath for desugaring %s",
target,
origin);
info.addMissingInterface(
Dependency.newBuilder().setOrigin(wrapType(origin)).setTarget(wrapType(target)));
missingInterfaces.add(
Dependency.newBuilder().setOrigin(wrapType(origin)).setTarget(wrapType(target)).build());
}

@Override
public void recordExtendedInterfaces(String origin, String... targets) {
if (targets.length > 0) {
InterfaceDetails.Builder details = InterfaceDetails.newBuilder().setOrigin(wrapType(origin));
ArrayList<DesugarDeps.Type> types = new ArrayList<>();
for (String target : targets) {
details.addExtendedInterface(wrapType(target));
types.add(wrapType(target));
}
info.addInterfaceWithSupertypes(details);
types.sort(Comparator.comparing(DesugarDeps.Type::getBinaryName));
details.addAllExtendedInterface(types);
interfacesWithSupertypes.add(details.build());
}
}

@Override
public void recordDefaultMethods(String origin, int count) {
checkArgument(!isInterfaceCompanionClass(origin), "seems to be a companion: %s", origin);
info.addInterfaceWithCompanion(
interfacesWithCompanion.add(
InterfaceWithCompanion.newBuilder()
.setOrigin(wrapType(origin))
.setNumDefaultMethods(count));
.setNumDefaultMethods(count)
.build());
}

@Override
@Nullable
public byte[] toByteArray() {
DesugarDepsInfo result = info.build();
return DesugarDepsInfo.getDefaultInstance().equals(result) ? null : result.toByteArray();
DesugarDeps.DesugarDepsInfo result = buildInfo();
return DesugarDeps.DesugarDepsInfo.getDefaultInstance().equals(result)
? null
: result.toByteArray();
}

private DesugarDeps.DesugarDepsInfo buildInfo() {

// Sort these for determinism.
assumePresents.sort(dependencyComparator);
missingInterfaces.sort(dependencyComparator);
interfacesWithSupertypes.sort(interfaceDetailComparator);
interfacesWithCompanion.sort(interFaceWithCompanionComparator);

DesugarDeps.DesugarDepsInfo.Builder info = DesugarDeps.DesugarDepsInfo.newBuilder();
info.addAllAssumePresent(assumePresents);
info.addAllMissingInterface(missingInterfaces);
info.addAllInterfaceWithSupertypes(interfacesWithSupertypes);
info.addAllInterfaceWithCompanion(interfacesWithCompanion);

return info.build();
}

private static final Comparator<? super DesugarDeps.Dependency> dependencyComparator =
Comparator.comparing((DesugarDeps.Dependency o) -> o.getOrigin().getBinaryName())
.thenComparing((DesugarDeps.Dependency o) -> o.getTarget().getBinaryName());

private static final Comparator<? super DesugarDeps.InterfaceDetails> interfaceDetailComparator =
Comparator.comparing((DesugarDeps.InterfaceDetails o) -> o.getOrigin().getBinaryName());

private static final Comparator<? super DesugarDeps.InterfaceWithCompanion>
interFaceWithCompanionComparator = Comparator.comparing(o -> o.getOrigin().getBinaryName());

private static DesugarDeps.Type wrapType(String internalName) {
return DesugarDeps.Type.newBuilder().setBinaryName(internalName).build();
}
Expand Down

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