android/sdk_version.go - LeafOS-Project/android_build_soong - Gitiles

 // Copyright 2021 Google Inc. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package android

 import (
 	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
 )

 type SdkContext interface {
 	// SdkVersion returns SdkSpec that corresponds to the sdk_version property of the current module
 	SdkVersion(ctx EarlyModuleContext) SdkSpec
 	// SystemModules returns the system_modules property of the current module, or an empty string if it is not set.
 	SystemModules() string
 	// MinSdkVersion returns ApiLevel that corresponds to the min_sdk_version property of the current module,
 	// or from sdk_version if it is not set.
 	MinSdkVersion(ctx EarlyModuleContext) ApiLevel
 	// ReplaceMaxSdkVersionPlaceholder returns Apilevel to replace the maxSdkVersion property of permission and
 	// uses-permission tags if it is set.
 	ReplaceMaxSdkVersionPlaceholder(ctx EarlyModuleContext) ApiLevel
 	// TargetSdkVersion returns the ApiLevel that corresponds to the target_sdk_version property of the current module,
 	// or from sdk_version if it is not set.
 	TargetSdkVersion(ctx EarlyModuleContext) ApiLevel
 }

 // SdkKind represents a particular category of an SDK spec like public, system, test, etc.
 type SdkKind int

 const (
 	SdkInvalid SdkKind = iota
 	SdkNone
 	SdkCore
 	SdkCorePlatform
 	SdkIntraCore // API surface provided by one core module to another
 	SdkPublic
 	SdkSystem
 	SdkTest
 	SdkTestFrameworksCore
 	SdkModule
 	SdkSystemServer
 	SdkPrivate
 	SdkToolchain // API surface provided by ART to compile other API domains
 )

 // String returns the string representation of this SdkKind
 func (k SdkKind) String() string {
 	switch k {
 	case SdkPrivate:
 		return "private"
 	case SdkNone:
 		return "none"
 	case SdkPublic:
 		return "public"
 	case SdkSystem:
 		return "system"
 	case SdkTest:
 		return "test"
 	case SdkTestFrameworksCore:
 		return "test_frameworks_core"
 	case SdkCore:
 		return "core"
 	case SdkCorePlatform:
 		return "core_platform"
 	case SdkIntraCore:
 		return "intracore"
 	case SdkModule:
 		return "module-lib"
 	case SdkSystemServer:
 		return "system-server"
 	case SdkToolchain:
 		return "toolchain"
 	default:
 		return "invalid"
 	}
 }

 func (k SdkKind) DefaultJavaLibraryName() string {
 	switch k {
 	case SdkPublic:
 		return "android_stubs_current"
 	case SdkSystem:
 		return "android_system_stubs_current"
 	case SdkTest:
 		return "android_test_stubs_current"
 	case SdkTestFrameworksCore:
 		return "android_test_frameworks_core_stubs_current"
 	case SdkCore:
 		return "core.current.stubs"
 	case SdkModule:
 		return "android_module_lib_stubs_current"
 	case SdkSystemServer:
 		return "android_system_server_stubs_current"
 	default:
 		panic(fmt.Errorf("APIs of API surface %v cannot be provided by a single Soong module\n", k))
 	}
 }

 func (k SdkKind) DefaultExportableJavaLibraryName() string {
 	switch k {
 	case SdkPublic, SdkSystem, SdkTest, SdkModule, SdkSystemServer:
 		return k.DefaultJavaLibraryName() + "_exportable"
 	case SdkCore:
 		return k.DefaultJavaLibraryName() + ".exportable"
 	default:
 		panic(fmt.Errorf("API surface %v does not provide exportable stubs", k))
 	}
 }

 // SdkSpec represents the kind and the version of an SDK for a module to build against
 type SdkSpec struct {
 	Kind     SdkKind
 	ApiLevel ApiLevel
 	Raw      string
 }

 func (s SdkSpec) String() string {
 	return fmt.Sprintf("%s_%s", s.Kind, s.ApiLevel)
 }

 // Valid checks if this SdkSpec is well-formed. Note however that true doesn't mean that the
 // specified SDK actually exists.
 func (s SdkSpec) Valid() bool {
 	return s.Kind != SdkInvalid
 }

 // Specified checks if this SdkSpec is well-formed and is not "".
 func (s SdkSpec) Specified() bool {
 	return s.Valid() && s.Kind != SdkPrivate
 }

 // whether the API surface is managed and versioned, i.e. has .txt file that
 // get frozen on SDK freeze and changes get reviewed by API council.
 func (s SdkSpec) Stable() bool {
 	if !s.Specified() {
 		return false
 	}
 	switch s.Kind {
 	case SdkNone:
 		// there is nothing to manage and version in this case; de facto stable API.
 		return true
 	case SdkCore, SdkPublic, SdkSystem, SdkModule, SdkSystemServer:
 		return true
 	case SdkCorePlatform, SdkTest, SdkTestFrameworksCore, SdkPrivate:
 		return false
 	default:
 		panic(fmt.Errorf("unknown SdkKind=%v", s.Kind))
 	}
 	return false
 }

 // PrebuiltSdkAvailableForUnbundledBuild tells whether this SdkSpec can have a prebuilt SDK
 // that can be used for unbundled builds.
 func (s SdkSpec) PrebuiltSdkAvailableForUnbundledBuild() bool {
 	// "", "none", and "core_platform" are not available for unbundled build
 	// as we don't/can't have prebuilt stub for the versions
 	return s.Kind != SdkPrivate && s.Kind != SdkNone && s.Kind != SdkCorePlatform
 }

 func (s SdkSpec) ForVendorPartition(ctx EarlyModuleContext) SdkSpec {
 	// If BOARD_CURRENT_API_LEVEL_FOR_VENDOR_MODULES has a numeric value,
 	// use it instead of "current" for the vendor partition.
 	currentSdkVersion := ctx.DeviceConfig().CurrentApiLevelForVendorModules()
 	// b/314011075: special case for Java modules in vendor partition. They can no longer use
 	// SDK 35 or later. Their maximum API level is limited to 34 (Android U). This is to
 	// discourage the use of Java APIs in the vendor partition which hasn't been officially
 	// supported since the Project Treble back in Android 10. We would like to eventually
 	// evacuate all Java modules from the partition, but that shall be done progressively.
 	// Note that the check for the availability of SDK 34 is to not break existing tests where
 	// any of the frozen SDK version is unavailable.
 	if isJava(ctx.Module()) && isSdkVersion34AvailableIn(ctx.Config()) {
 		currentSdkVersion = "34"
 	}

 	if currentSdkVersion == "current" {
 		return s
 	}

 	if s.Kind == SdkPublic || s.Kind == SdkSystem {
 		if s.ApiLevel.IsCurrent() {
 			if i, err := strconv.Atoi(currentSdkVersion); err == nil {
 				apiLevel := uncheckedFinalApiLevel(i)
 				return SdkSpec{s.Kind, apiLevel, s.Raw}
 			}
 			panic(fmt.Errorf("BOARD_CURRENT_API_LEVEL_FOR_VENDOR_MODULES must be either \"current\" or a number, but was %q", currentSdkVersion))
 		}
 	}
 	return s
 }

 // UsePrebuilt determines whether prebuilt SDK should be used for this SdkSpec with the given context.
 func (s SdkSpec) UsePrebuilt(ctx EarlyModuleContext) bool {
 	switch s {
 	case SdkSpecNone, SdkSpecCorePlatform, SdkSpecPrivate:
 		return false
 	}

 	if s.ApiLevel.IsCurrent() {
 		// "current" can be built from source and be from prebuilt SDK
 		return ctx.Config().AlwaysUsePrebuiltSdks()
 	} else if !s.ApiLevel.IsPreview() {
 		// validation check
 		if s.Kind != SdkPublic && s.Kind != SdkSystem && s.Kind != SdkTest &&
 			s.Kind != SdkTestFrameworksCore && s.Kind != SdkModule && s.Kind != SdkSystemServer {
 			panic(fmt.Errorf("prebuilt SDK is not not available for SdkKind=%q", s.Kind))
 			return false
 		}
 		// numbered SDKs are always from prebuilt
 		return true
 	}
 	return false
 }

 // EffectiveVersion converts an SdkSpec into the concrete ApiLevel that the module should use. For
 // modules targeting an unreleased SDK (meaning it does not yet have a number) it returns
 // FutureApiLevel(10000).
 func (s SdkSpec) EffectiveVersion(ctx EarlyModuleContext) (ApiLevel, error) {
 	if !s.Valid() {
 		return s.ApiLevel, fmt.Errorf("invalid sdk version %q", s.Raw)
 	}

 	if ctx.DeviceSpecific() || ctx.SocSpecific() {
 		s = s.ForVendorPartition(ctx)
 	}
 	return s.ApiLevel.EffectiveVersion(ctx)
 }

 // EffectiveVersionString converts an SdkSpec into the concrete version string that the module
 // should use. For modules targeting an unreleased SDK (meaning it does not yet have a number)
 // it returns the codename (P, Q, R, etc.)
 func (s SdkSpec) EffectiveVersionString(ctx EarlyModuleContext) (string, error) {
 	if !s.Valid() {
 		return s.ApiLevel.String(), fmt.Errorf("invalid sdk version %q", s.Raw)
 	}

 	if ctx.DeviceSpecific() || ctx.SocSpecific() {
 		s = s.ForVendorPartition(ctx)
 	}
 	return s.ApiLevel.EffectiveVersionString(ctx)
 }

 var (
 	SdkSpecNone         = SdkSpec{SdkNone, NoneApiLevel, "(no version)"}
 	SdkSpecPrivate      = SdkSpec{SdkPrivate, PrivateApiLevel, ""}
 	SdkSpecCorePlatform = SdkSpec{SdkCorePlatform, FutureApiLevel, "core_platform"}
 )

 func SdkSpecFrom(ctx EarlyModuleContext, str string) SdkSpec {
 	return SdkSpecFromWithConfig(ctx.Config(), str)
 }

 func SdkSpecFromWithConfig(config Config, str string) SdkSpec {
 	switch str {
 	// special cases first
 	case "":
 		return SdkSpecPrivate
 	case "none":
 		return SdkSpecNone
 	case "core_platform":
 		return SdkSpecCorePlatform
 	default:
 		// the syntax is [kind_]version
 		sep := strings.LastIndex(str, "_")

 		var kindString string
 		if sep == 0 {
 			return SdkSpec{SdkInvalid, NewInvalidApiLevel(str), str}
 		} else if sep == -1 {
 			kindString = ""
 		} else {
 			kindString = str[0:sep]
 		}
 		versionString := str[sep+1 : len(str)]

 		var kind SdkKind
 		switch kindString {
 		case "":
 			kind = SdkPublic
 		case "core":
 			kind = SdkCore
 		case "system":
 			kind = SdkSystem
 		case "test":
 			kind = SdkTest
 		case "test_frameworks_core":
 			kind = SdkTestFrameworksCore
 		case "module":
 			kind = SdkModule
 		case "system_server":
 			kind = SdkSystemServer
 		default:
 			return SdkSpec{SdkInvalid, NoneApiLevel, str}
 		}

 		apiLevel, err := ApiLevelFromUserWithConfig(config, versionString)
 		if err != nil {
 			return SdkSpec{SdkInvalid, NewInvalidApiLevel(versionString), str}
 		}
 		return SdkSpec{kind, apiLevel, str}
 	}
 }

 // Checks if the use of this SDK `s` is valid for the given module context `ctx`.
 func (s SdkSpec) ValidateSystemSdk(ctx EarlyModuleContext) bool {
 	// Do some early checks. This check is currently only for Java modules. And our only concern
 	// is the use of "system" SDKs.
 	if !isJava(ctx.Module()) || s.Kind != SdkSystem || ctx.DeviceConfig().BuildBrokenDontCheckSystemSdk() {
 		return true
 	}

 	inVendor := ctx.DeviceSpecific() || ctx.SocSpecific()
 	inProduct := ctx.ProductSpecific()
 	isProductUnbundled := ctx.Config().EnforceProductPartitionInterface()
 	inApex := false
 	if am, ok := ctx.Module().(ApexModule); ok {
 		inApex = am.InAnyApex()
 	}
 	isUnbundled := inVendor || (inProduct && isProductUnbundled) || inApex

 	// Bundled modules can use any SDK
 	if !isUnbundled {
 		return true
 	}

 	// Unbundled modules are allowed to use BOARD_SYSTEMSDK_VERSIONS
 	supportedVersions := ctx.DeviceConfig().SystemSdkVersions()

 	// b/314011075: special case for vendor modules. Java modules in the vendor partition can
 	// not use SDK 35 or later. This is to discourage the use of Java APIs in the vendor
 	// partition which hasn't been officially supported since the Project Treble back in Android
 	// 10. We would like to eventually evacuate all Java modules from the partition, but that
 	// shall be done progressively.
 	if inVendor {
 		// 28 was the API when BOARD_SYSTEMSDK_VERSIONS was introduced, so that's the oldest
 		// we should allow.
 		supportedVersions = []string{}
 		for v := 28; v <= 34; v++ {
 			supportedVersions = append(supportedVersions, strconv.Itoa(v))
 		}
 	}

 	// APEXes in the system partition are still considered as part of the platform, thus can use
 	// more SDKs from PLATFORM_SYSTEMSDK_VERSIONS
 	if inApex && !inVendor {
 		supportedVersions = ctx.DeviceConfig().PlatformSystemSdkVersions()
 	}

 	thisVer, err := s.EffectiveVersion(ctx)
 	if err != nil {
 		ctx.PropertyErrorf("sdk_version", "invalid sdk version %q", s.Raw)
 		return false
 	}

 	thisVerString := strconv.Itoa(thisVer.FinalOrPreviewInt())
 	if thisVer.IsPreview() {
 		thisVerString = *ctx.Config().productVariables.Platform_sdk_version_or_codename
 	}

 	if !InList(thisVerString, supportedVersions) {
 		ctx.PropertyErrorf("sdk_version", "incompatible sdk version %q. System SDK version should be one of %q",
 			s.Raw, supportedVersions)
 		return false
 	}
 	return true
 }

 func isJava(m Module) bool {
 	moduleType := reflect.TypeOf(m).String()
 	return strings.HasPrefix(moduleType, "*java.")
 }

 func isSdkVersion34AvailableIn(c Config) bool {
 	return c.PlatformSdkVersion().FinalInt() >= 34
 }

 func init() {
 	RegisterMakeVarsProvider(pctx, javaSdkMakeVars)
 }

 // Export the name of the soong modules representing the various Java API surfaces.
 func javaSdkMakeVars(ctx MakeVarsContext) {
 	ctx.Strict("ANDROID_PUBLIC_STUBS", SdkPublic.DefaultJavaLibraryName())
 	ctx.Strict("ANDROID_PUBLIC_EXPORTABLE_STUBS", SdkPublic.DefaultExportableJavaLibraryName())
 	ctx.Strict("ANDROID_SYSTEM_STUBS", SdkSystem.DefaultJavaLibraryName())
 	ctx.Strict("ANDROID_TEST_STUBS", SdkTest.DefaultJavaLibraryName())
 	ctx.Strict("ANDROID_MODULE_LIB_STUBS", SdkModule.DefaultJavaLibraryName())
 	ctx.Strict("ANDROID_SYSTEM_SERVER_STUBS", SdkSystemServer.DefaultJavaLibraryName())
 	ctx.Strict("ANDROID_CORE_STUBS", SdkCore.DefaultJavaLibraryName())
 }
	// Copyright 2021 Google Inc. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package android

	import (
	"fmt"
	"reflect"
	"strconv"
	"strings"
	)

	type SdkContext interface {
	// SdkVersion returns SdkSpec that corresponds to the sdk_version property of the current module
	SdkVersion(ctx EarlyModuleContext) SdkSpec
	// SystemModules returns the system_modules property of the current module, or an empty string if it is not set.
	SystemModules() string
	// MinSdkVersion returns ApiLevel that corresponds to the min_sdk_version property of the current module,
	// or from sdk_version if it is not set.
	MinSdkVersion(ctx EarlyModuleContext) ApiLevel
	// ReplaceMaxSdkVersionPlaceholder returns Apilevel to replace the maxSdkVersion property of permission and
	// uses-permission tags if it is set.
	ReplaceMaxSdkVersionPlaceholder(ctx EarlyModuleContext) ApiLevel
	// TargetSdkVersion returns the ApiLevel that corresponds to the target_sdk_version property of the current module,
	// or from sdk_version if it is not set.
	TargetSdkVersion(ctx EarlyModuleContext) ApiLevel
	}

	// SdkKind represents a particular category of an SDK spec like public, system, test, etc.
	type SdkKind int

	const (
	SdkInvalid SdkKind = iota
	SdkNone
	SdkCore
	SdkCorePlatform
	SdkIntraCore // API surface provided by one core module to another
	SdkPublic
	SdkSystem
	SdkTest
	SdkTestFrameworksCore
	SdkModule
	SdkSystemServer
	SdkPrivate
	SdkToolchain // API surface provided by ART to compile other API domains
	)

	// String returns the string representation of this SdkKind
	func (k SdkKind) String() string {
	switch k {
	case SdkPrivate:
	return "private"
	case SdkNone:
	return "none"
	case SdkPublic:
	return "public"
	case SdkSystem:
	return "system"
	case SdkTest:
	return "test"
	case SdkTestFrameworksCore:
	return "test_frameworks_core"
	case SdkCore:
	return "core"
	case SdkCorePlatform:
	return "core_platform"
	case SdkIntraCore:
	return "intracore"
	case SdkModule:
	return "module-lib"
	case SdkSystemServer:
	return "system-server"
	case SdkToolchain:
	return "toolchain"
	default:
	return "invalid"
	}
	}

	func (k SdkKind) DefaultJavaLibraryName() string {
	switch k {
	case SdkPublic:
	return "android_stubs_current"
	case SdkSystem:
	return "android_system_stubs_current"
	case SdkTest:
	return "android_test_stubs_current"
	case SdkTestFrameworksCore:
	return "android_test_frameworks_core_stubs_current"
	case SdkCore:
	return "core.current.stubs"
	case SdkModule:
	return "android_module_lib_stubs_current"
	case SdkSystemServer:
	return "android_system_server_stubs_current"
	default:
	panic(fmt.Errorf("APIs of API surface %v cannot be provided by a single Soong module\n", k))
	}
	}

	func (k SdkKind) DefaultExportableJavaLibraryName() string {
	switch k {
	case SdkPublic, SdkSystem, SdkTest, SdkModule, SdkSystemServer:
	return k.DefaultJavaLibraryName() + "_exportable"
	case SdkCore:
	return k.DefaultJavaLibraryName() + ".exportable"
	default:
	panic(fmt.Errorf("API surface %v does not provide exportable stubs", k))
	}
	}

	// SdkSpec represents the kind and the version of an SDK for a module to build against
	type SdkSpec struct {
	Kind SdkKind
	ApiLevel ApiLevel
	Raw string
	}

	func (s SdkSpec) String() string {
	return fmt.Sprintf("%s_%s", s.Kind, s.ApiLevel)
	}

	// Valid checks if this SdkSpec is well-formed. Note however that true doesn't mean that the
	// specified SDK actually exists.
	func (s SdkSpec) Valid() bool {
	return s.Kind != SdkInvalid
	}

	// Specified checks if this SdkSpec is well-formed and is not "".
	func (s SdkSpec) Specified() bool {
	return s.Valid() && s.Kind != SdkPrivate
	}

	// whether the API surface is managed and versioned, i.e. has .txt file that
	// get frozen on SDK freeze and changes get reviewed by API council.
	func (s SdkSpec) Stable() bool {
	if !s.Specified() {
	return false
	}
	switch s.Kind {
	case SdkNone:
	// there is nothing to manage and version in this case; de facto stable API.
	return true
	case SdkCore, SdkPublic, SdkSystem, SdkModule, SdkSystemServer:
	return true
	case SdkCorePlatform, SdkTest, SdkTestFrameworksCore, SdkPrivate:
	return false
	default:
	panic(fmt.Errorf("unknown SdkKind=%v", s.Kind))
	}
	return false
	}

	// PrebuiltSdkAvailableForUnbundledBuild tells whether this SdkSpec can have a prebuilt SDK
	// that can be used for unbundled builds.
	func (s SdkSpec) PrebuiltSdkAvailableForUnbundledBuild() bool {
	// "", "none", and "core_platform" are not available for unbundled build
	// as we don't/can't have prebuilt stub for the versions
	return s.Kind != SdkPrivate && s.Kind != SdkNone && s.Kind != SdkCorePlatform
	}

	func (s SdkSpec) ForVendorPartition(ctx EarlyModuleContext) SdkSpec {
	// If BOARD_CURRENT_API_LEVEL_FOR_VENDOR_MODULES has a numeric value,
	// use it instead of "current" for the vendor partition.
	currentSdkVersion := ctx.DeviceConfig().CurrentApiLevelForVendorModules()
	// b/314011075: special case for Java modules in vendor partition. They can no longer use
	// SDK 35 or later. Their maximum API level is limited to 34 (Android U). This is to
	// discourage the use of Java APIs in the vendor partition which hasn't been officially
	// supported since the Project Treble back in Android 10. We would like to eventually
	// evacuate all Java modules from the partition, but that shall be done progressively.
	// Note that the check for the availability of SDK 34 is to not break existing tests where
	// any of the frozen SDK version is unavailable.
	if isJava(ctx.Module()) && isSdkVersion34AvailableIn(ctx.Config()) {
	currentSdkVersion = "34"
	}

	if currentSdkVersion == "current" {
	return s
	}

	if s.Kind == SdkPublic \|\| s.Kind == SdkSystem {
	if s.ApiLevel.IsCurrent() {
	if i, err := strconv.Atoi(currentSdkVersion); err == nil {
	apiLevel := uncheckedFinalApiLevel(i)
	return SdkSpec{s.Kind, apiLevel, s.Raw}
	}
	panic(fmt.Errorf("BOARD_CURRENT_API_LEVEL_FOR_VENDOR_MODULES must be either \"current\" or a number, but was %q", currentSdkVersion))
	}
	}
	return s
	}

	// UsePrebuilt determines whether prebuilt SDK should be used for this SdkSpec with the given context.
	func (s SdkSpec) UsePrebuilt(ctx EarlyModuleContext) bool {
	switch s {
	case SdkSpecNone, SdkSpecCorePlatform, SdkSpecPrivate:
	return false
	}

	if s.ApiLevel.IsCurrent() {
	// "current" can be built from source and be from prebuilt SDK
	return ctx.Config().AlwaysUsePrebuiltSdks()
	} else if !s.ApiLevel.IsPreview() {
	// validation check
	if s.Kind != SdkPublic && s.Kind != SdkSystem && s.Kind != SdkTest &&
	s.Kind != SdkTestFrameworksCore && s.Kind != SdkModule && s.Kind != SdkSystemServer {
	panic(fmt.Errorf("prebuilt SDK is not not available for SdkKind=%q", s.Kind))
	return false
	}
	// numbered SDKs are always from prebuilt
	return true
	}
	return false
	}

	// EffectiveVersion converts an SdkSpec into the concrete ApiLevel that the module should use. For
	// modules targeting an unreleased SDK (meaning it does not yet have a number) it returns
	// FutureApiLevel(10000).
	func (s SdkSpec) EffectiveVersion(ctx EarlyModuleContext) (ApiLevel, error) {
	if !s.Valid() {
	return s.ApiLevel, fmt.Errorf("invalid sdk version %q", s.Raw)
	}

	if ctx.DeviceSpecific() \|\| ctx.SocSpecific() {
	s = s.ForVendorPartition(ctx)
	}
	return s.ApiLevel.EffectiveVersion(ctx)
	}

	// EffectiveVersionString converts an SdkSpec into the concrete version string that the module
	// should use. For modules targeting an unreleased SDK (meaning it does not yet have a number)
	// it returns the codename (P, Q, R, etc.)
	func (s SdkSpec) EffectiveVersionString(ctx EarlyModuleContext) (string, error) {
	if !s.Valid() {
	return s.ApiLevel.String(), fmt.Errorf("invalid sdk version %q", s.Raw)
	}

	if ctx.DeviceSpecific() \|\| ctx.SocSpecific() {
	s = s.ForVendorPartition(ctx)
	}
	return s.ApiLevel.EffectiveVersionString(ctx)
	}

	var (
	SdkSpecNone = SdkSpec{SdkNone, NoneApiLevel, "(no version)"}
	SdkSpecPrivate = SdkSpec{SdkPrivate, PrivateApiLevel, ""}
	SdkSpecCorePlatform = SdkSpec{SdkCorePlatform, FutureApiLevel, "core_platform"}
	)

	func SdkSpecFrom(ctx EarlyModuleContext, str string) SdkSpec {
	return SdkSpecFromWithConfig(ctx.Config(), str)
	}

	func SdkSpecFromWithConfig(config Config, str string) SdkSpec {
	switch str {
	// special cases first
	case "":
	return SdkSpecPrivate
	case "none":
	return SdkSpecNone
	case "core_platform":
	return SdkSpecCorePlatform
	default:
	// the syntax is [kind_]version
	sep := strings.LastIndex(str, "_")

	var kindString string
	if sep == 0 {
	return SdkSpec{SdkInvalid, NewInvalidApiLevel(str), str}
	} else if sep == -1 {
	kindString = ""
	} else {
	kindString = str[0:sep]
	}
	versionString := str[sep+1 : len(str)]

	var kind SdkKind
	switch kindString {
	case "":
	kind = SdkPublic
	case "core":
	kind = SdkCore
	case "system":
	kind = SdkSystem
	case "test":
	kind = SdkTest
	case "test_frameworks_core":
	kind = SdkTestFrameworksCore
	case "module":
	kind = SdkModule
	case "system_server":
	kind = SdkSystemServer
	default:
	return SdkSpec{SdkInvalid, NoneApiLevel, str}
	}

	apiLevel, err := ApiLevelFromUserWithConfig(config, versionString)
	if err != nil {
	return SdkSpec{SdkInvalid, NewInvalidApiLevel(versionString), str}
	}
	return SdkSpec{kind, apiLevel, str}
	}
	}

	// Checks if the use of this SDK `s` is valid for the given module context `ctx`.
	func (s SdkSpec) ValidateSystemSdk(ctx EarlyModuleContext) bool {
	// Do some early checks. This check is currently only for Java modules. And our only concern
	// is the use of "system" SDKs.
	if !isJava(ctx.Module()) \|\| s.Kind != SdkSystem \|\| ctx.DeviceConfig().BuildBrokenDontCheckSystemSdk() {
	return true
	}

	inVendor := ctx.DeviceSpecific() \|\| ctx.SocSpecific()
	inProduct := ctx.ProductSpecific()
	isProductUnbundled := ctx.Config().EnforceProductPartitionInterface()
	inApex := false
	if am, ok := ctx.Module().(ApexModule); ok {
	inApex = am.InAnyApex()
	}
	isUnbundled := inVendor \|\| (inProduct && isProductUnbundled) \|\| inApex

	// Bundled modules can use any SDK
	if !isUnbundled {
	return true
	}

	// Unbundled modules are allowed to use BOARD_SYSTEMSDK_VERSIONS
	supportedVersions := ctx.DeviceConfig().SystemSdkVersions()

	// b/314011075: special case for vendor modules. Java modules in the vendor partition can
	// not use SDK 35 or later. This is to discourage the use of Java APIs in the vendor
	// partition which hasn't been officially supported since the Project Treble back in Android
	// 10. We would like to eventually evacuate all Java modules from the partition, but that
	// shall be done progressively.
	if inVendor {
	// 28 was the API when BOARD_SYSTEMSDK_VERSIONS was introduced, so that's the oldest
	// we should allow.
	supportedVersions = []string{}
	for v := 28; v <= 34; v++ {
	supportedVersions = append(supportedVersions, strconv.Itoa(v))
	}
	}

	// APEXes in the system partition are still considered as part of the platform, thus can use
	// more SDKs from PLATFORM_SYSTEMSDK_VERSIONS
	if inApex && !inVendor {
	supportedVersions = ctx.DeviceConfig().PlatformSystemSdkVersions()
	}

	thisVer, err := s.EffectiveVersion(ctx)
	if err != nil {
	ctx.PropertyErrorf("sdk_version", "invalid sdk version %q", s.Raw)
	return false
	}

	thisVerString := strconv.Itoa(thisVer.FinalOrPreviewInt())
	if thisVer.IsPreview() {
	thisVerString = *ctx.Config().productVariables.Platform_sdk_version_or_codename
	}

	if !InList(thisVerString, supportedVersions) {
	ctx.PropertyErrorf("sdk_version", "incompatible sdk version %q. System SDK version should be one of %q",
	s.Raw, supportedVersions)
	return false
	}
	return true
	}

	func isJava(m Module) bool {
	moduleType := reflect.TypeOf(m).String()
	return strings.HasPrefix(moduleType, "*java.")
	}

	func isSdkVersion34AvailableIn(c Config) bool {
	return c.PlatformSdkVersion().FinalInt() >= 34
	}

	func init() {
	RegisterMakeVarsProvider(pctx, javaSdkMakeVars)
	}

	// Export the name of the soong modules representing the various Java API surfaces.
	func javaSdkMakeVars(ctx MakeVarsContext) {
	ctx.Strict("ANDROID_PUBLIC_STUBS", SdkPublic.DefaultJavaLibraryName())
	ctx.Strict("ANDROID_PUBLIC_EXPORTABLE_STUBS", SdkPublic.DefaultExportableJavaLibraryName())
	ctx.Strict("ANDROID_SYSTEM_STUBS", SdkSystem.DefaultJavaLibraryName())
	ctx.Strict("ANDROID_TEST_STUBS", SdkTest.DefaultJavaLibraryName())
	ctx.Strict("ANDROID_MODULE_LIB_STUBS", SdkModule.DefaultJavaLibraryName())
	ctx.Strict("ANDROID_SYSTEM_SERVER_STUBS", SdkSystemServer.DefaultJavaLibraryName())
	ctx.Strict("ANDROID_CORE_STUBS", SdkCore.DefaultJavaLibraryName())
	}