[Plugins] Provide plugin invocation and serialization with underlying modules graph

Author: xedin

Sources/Commands/PackageCommands/PluginCommand.swift

@@ -371,6 +371,7 @@ struct PluginCommand: SwiftCommand {
             pkgConfigDirectories: swiftCommandState.options.locations.pkgConfigDirectories,
             sdkRootPath: buildParameters.toolchain.sdkRootPath,
             fileSystem: swiftCommandState.fileSystem,
+            modulesGraph: packageGraph,
             observabilityScope: swiftCommandState.observabilityScope,
             callbackQueue: delegateQueue,
             delegate: pluginDelegate,

Sources/SPMBuildCore/Plugins/PluginContextSerializer.swift

@@ -22,6 +22,7 @@ typealias WireInput = HostToPluginMessage.InputContext
 /// the input information to a plugin.
 internal struct PluginContextSerializer {
     let fileSystem: FileSystem
+    let modulesGraph: ModulesGraph
     let buildEnvironment: BuildEnvironment
     let pkgConfigDirectories: [AbsolutePath]
     let sdkRootPath: AbsolutePath?

Sources/SPMBuildCore/Plugins/PluginInvocation.swift

@@ -43,6 +43,7 @@ extension PluginTarget {
         pkgConfigDirectories: [AbsolutePath],
         sdkRootPath: AbsolutePath?,
         fileSystem: FileSystem,
+        modulesGraph: ModulesGraph,
         observabilityScope: ObservabilityScope,
         callbackQueue: DispatchQueue,
         delegate: PluginInvocationDelegate
@@ -62,6 +63,7 @@ extension PluginTarget {
                 pkgConfigDirectories: pkgConfigDirectories,
                 sdkRootPath: sdkRootPath,
                 fileSystem: fileSystem,
+                modulesGraph: modulesGraph,
                 observabilityScope: observabilityScope,
                 callbackQueue: callbackQueue,
                 delegate: delegate,
@@ -107,6 +109,7 @@ extension PluginTarget {
         pkgConfigDirectories: [AbsolutePath],
         sdkRootPath: AbsolutePath?,
         fileSystem: FileSystem,
+        modulesGraph: ModulesGraph,
         observabilityScope: ObservabilityScope,
         callbackQueue: DispatchQueue,
         delegate: PluginInvocationDelegate,
@@ -125,6 +128,7 @@ extension PluginTarget {
         do {
             var serializer = PluginContextSerializer(
                 fileSystem: fileSystem,
+                modulesGraph: modulesGraph,
                 buildEnvironment: buildEnvironment,
                 pkgConfigDirectories: pkgConfigDirectories,
                 sdkRootPath: sdkRootPath
@@ -571,6 +575,7 @@ extension ModulesGraph {
                     pkgConfigDirectories: pkgConfigDirectories,
                     sdkRootPath: buildParameters.toolchain.sdkRootPath,
                     fileSystem: fileSystem,
+                    modulesGraph: self,
                     observabilityScope: observabilityScope,
                     callbackQueue: delegateQueue,
                     delegate: delegate,

Tests/FunctionalTests/PluginTests.swift

@@ -548,6 +548,7 @@ final class PluginTests: XCTestCase {
                         pkgConfigDirectories: [],
                         sdkRootPath: nil,
                         fileSystem: localFileSystem,
+                        modulesGraph: packageGraph,
                         observabilityScope: observability.topScope,
                         callbackQueue: delegateQueue,
                         delegate: delegate,
@@ -825,6 +826,7 @@ final class PluginTests: XCTestCase {
                             pkgConfigDirectories: [],
                             sdkRootPath: try UserToolchain.default.sdkRootPath,
                             fileSystem: localFileSystem,
+                            modulesGraph: packageGraph,
                             observabilityScope: observability.topScope,
                             callbackQueue: delegateQueue,
                             delegate: delegate