BuildInvocationScopeId buildInvocationScopeId = new BuildInvocationScopeId(UniqueId.generate());
        BuildTreeState buildTreeState = new BuildTreeState(buildInvocationScopeId, buildSessionState.getServices(), modelServices);
        TestRootBuild build = new TestRootBuild(projectDir, startParameter, buildTreeState);

        BuildScopeServices buildServices = build.getBuildServices();

import org.gradle.initialization.IncludedBuildSpec;
import org.gradle.internal.Describables;
import org.gradle.internal.DisplayName;
import org.gradle.internal.buildtree.BuildTreeState;
import org.gradle.internal.lazy.Lazy;
import org.gradle.internal.service.scopes.BuildScopeServices;

import javax.annotation.Nullable;
import java.io.Closeable;
import java.io.IOException;

            state is RootBuildState -> {
                writeEnum(BuildType.RootBuild)
                writeBuildContent(build.build, buildTreeState)
            }

            state is IncludedBuildState -> {
                writeEnum(BuildType.IncludedBuild)
                writeIncludedBuild(state, buildTreeState)
            }

            state is StandAloneNestedBuild -> {
                writeEnum(BuildType.BuildSrcBuild)

            BuildInvocationScopeId buildInvocationScopeId = new BuildInvocationScopeId(UniqueId.generate());
            BuildTreeState buildTree = new BuildTreeState(buildInvocationScopeId, buildSession.getServices(), modelServices);
            try {
                result = buildTree.run(context -> context.execute(action));
            } finally {

    private final BuildInvocationScopeId buildInvocationScopeId;
    private final BuildTreeState buildTree;
    private final BuildTreeModelControllerServices.Supplier modelServices;

    public BuildTreeScopeServices(BuildInvocationScopeId buildInvocationScopeId, BuildTreeState buildTree, BuildTreeModelControllerServices.Supplier modelServices) {
        this.buildInvocationScopeId = buildInvocationScopeId;

        }
    }

    internal
    fun writeIncludedBuildStateTo(stateFile: ConfigurationCacheStateFile, buildTreeState: StoredBuildTreeState) {
        writeConfigurationCacheState(stateFile) { cacheState ->
            cacheState.run {
                writeBuildContent(host.currentBuild, buildTreeState)
            }
        }
    }

    internal

"Build tree" is another name for the build definition.
The "build tree state" holds the state for the entire build definition for a single build execution within a session.

The build tree state is managed by the `BuildTreeState` class.
An instance is created at the start of a build execution and discarded at the end of the execution.

### Build state