sdk_version: "module_current" is supported

module_* is a new API surface for OS modules (e.g. APEXes). It has
slightly bigger API surface than the system_* SDK. Specifically, APIs
with @SystemApi(client=MODULE_LIBRARIES) are added there.

Bug: 146757305
Test: m

Change-Id: I8980e50c0e3a4cd843048e0de1f638e854384f46

java/java.go

@@ -757,9 +757,12 @@ func checkProducesJars(ctx android.ModuleContext, dep android.SourceFileProducer
 type linkType int
 
 const (
+	// TODO(jiyong) rename these for better readability. Make the allowed
+	// and disallowed link types explicit
 	javaCore linkType = iota
 	javaSdk
 	javaSystem
+	javaModule
 	javaPlatform
 )
 
@@ -789,6 +792,10 @@ func (m *Module) getLinkType(name string) (ret linkType, stubs bool) {
 		return javaSdk, true
 	case ver.kind == sdkPublic:
 		return javaSdk, false
+	case name == "android_module_lib_stubs_current":
+		return javaModule, true
+	case ver.kind == sdkModule:
+		return javaModule, false
 	case ver.kind == sdkPrivate || ver.kind == sdkNone || ver.kind == sdkCorePlatform:
 		return javaPlatform, false
 	case !ver.valid():
@@ -824,11 +831,17 @@ func checkLinkType(ctx android.ModuleContext, from *Module, to linkTypeContext,
 		}
 		break
 	case javaSystem:
-		if otherLinkType == javaPlatform {
+		if otherLinkType == javaPlatform || otherLinkType == javaModule {
 			ctx.ModuleErrorf("compiles against system API, but dependency %q is compiling against private API."+commonMessage,
 				ctx.OtherModuleName(to))
 		}
 		break
+	case javaModule:
+		if otherLinkType == javaPlatform {
+			ctx.ModuleErrorf("compiles against module API, but dependency %q is compiling against private API."+commonMessage,
+				ctx.OtherModuleName(to))
+		}
+		break
 	case javaPlatform:
 		// no restriction on link-type
 		break

java/sdk.go

@@ -71,6 +71,7 @@ const (
 	sdkPublic
 	sdkSystem
 	sdkTest
+	sdkModule
 	sdkPrivate
 )
 
@@ -91,6 +92,8 @@ func (k sdkKind) String() string {
 		return "core"
 	case sdkCorePlatform:
 		return "core_platform"
+	case sdkModule:
+		return "module"
 	default:
 		return "invalid"
 	}
@@ -256,6 +259,8 @@ func sdkSpecFrom(str string) sdkSpec {
 			kind = sdkSystem
 		case "test":
 			kind = sdkTest
+		case "module":
+			kind = sdkModule
 		default:
 			return sdkSpec{sdkInvalid, sdkVersionNone, str}
 		}
@@ -382,6 +387,9 @@ func decodeSdkDep(ctx android.EarlyModuleContext, sdkContext sdkContext) sdkDep
 		return toModule("android_test_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
 	case sdkCore:
 		return toModule("core.current.stubs", "", nil)
+	case sdkModule:
+		// TODO(146757305): provide .apk and .aidl that have more APIs for modules
+		return toModule("android_module_lib_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
 	default:
 		panic(fmt.Errorf("invalid sdk %q", sdkVersion.raw))
 	}

java/sdk_test.go

@@ -211,6 +211,15 @@ func TestClasspath(t *testing.T) {
 			java8classpath: []string{"prebuilts/sdk/29/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
 			aidl:           "-pprebuilts/sdk/29/public/framework.aidl",
 		},
+		{
+
+			name:           "module_current",
+			properties:     `sdk_version: "module_current",`,
+			bootclasspath:  []string{"android_module_lib_stubs_current", "core-lambda-stubs"},
+			system:         "core-current-stubs-system-modules",
+			java9classpath: []string{"android_module_lib_stubs_current"},
+			aidl:           "-p" + buildDir + "/framework.aidl",
+		},
 	}
 
 	for _, testcase := range classpathTestcases {

java/testing.go

@@ -142,6 +142,7 @@ func GatherRequiredDepsForTest() string {
 		"android_stubs_current",
 		"android_system_stubs_current",
 		"android_test_stubs_current",
+		"android_module_lib_stubs_current",
 		"core.current.stubs",
 		"core.platform.api.stubs",
 		"kotlin-stdlib",