android/bazel.go - SHIFTPHONES/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"
 	"io/ioutil"
 	"path/filepath"
 	"strings"

 	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
 )

 type bazelModuleProperties struct {
 	// The label of the Bazel target replacing this Soong module. When run in conversion mode, this
 	// will import the handcrafted build target into the autogenerated file. Note: this may result in
 	// a conflict due to duplicate targets if bp2build_available is also set.
 	Label *string

 	// If true, bp2build will generate the converted Bazel target for this module. Note: this may
 	// cause a conflict due to the duplicate targets if label is also set.
 	//
 	// This is a bool pointer to support tristates: true, false, not set.
 	//
 	// To opt-in a module, set bazel_module: { bp2build_available: true }
 	// To opt-out a module, set bazel_module: { bp2build_available: false }
 	// To defer the default setting for the directory, do not set the value.
 	Bp2build_available *bool
 }

 // Properties contains common module properties for Bazel migration purposes.
 type properties struct {
 	// In USE_BAZEL_ANALYSIS=1 mode, this represents the Bazel target replacing
 	// this Soong module.
 	Bazel_module bazelModuleProperties
 }

 // BazelModuleBase contains the property structs with metadata for modules which can be converted to
 // Bazel.
 type BazelModuleBase struct {
 	bazelProperties properties
 }

 // Bazelable is specifies the interface for modules that can be converted to Bazel.
 type Bazelable interface {
 	bazelProps() *properties
 	HasHandcraftedLabel() bool
 	HandcraftedLabel() string
 	GetBazelLabel(ctx BazelConversionPathContext, module blueprint.Module) string
 	ConvertWithBp2build(ctx BazelConversionPathContext) bool
 	GetBazelBuildFileContents(c Config, path, name string) (string, error)
 	ConvertedToBazel(ctx BazelConversionPathContext) bool
 }

 // BazelModule is a lightweight wrapper interface around Module for Bazel-convertible modules.
 type BazelModule interface {
 	Module
 	Bazelable
 }

 // InitBazelModule is a wrapper function that decorates a BazelModule with Bazel-conversion
 // properties.
 func InitBazelModule(module BazelModule) {
 	module.AddProperties(module.bazelProps())
 }

 // bazelProps returns the Bazel properties for the given BazelModuleBase.
 func (b *BazelModuleBase) bazelProps() *properties {
 	return &b.bazelProperties
 }

 // HasHandcraftedLabel returns whether this module has a handcrafted Bazel label.
 func (b *BazelModuleBase) HasHandcraftedLabel() bool {
 	return b.bazelProperties.Bazel_module.Label != nil
 }

 // HandcraftedLabel returns the handcrafted label for this module, or empty string if there is none
 func (b *BazelModuleBase) HandcraftedLabel() string {
 	return proptools.String(b.bazelProperties.Bazel_module.Label)
 }

 // GetBazelLabel returns the Bazel label for the given BazelModuleBase.
 func (b *BazelModuleBase) GetBazelLabel(ctx BazelConversionPathContext, module blueprint.Module) string {
 	if b.HasHandcraftedLabel() {
 		return b.HandcraftedLabel()
 	}
 	if b.ConvertWithBp2build(ctx) {
 		return bp2buildModuleLabel(ctx, module)
 	}
 	return "" // no label for unconverted module
 }

 // Configuration to decide if modules in a directory should default to true/false for bp2build_available
 type Bp2BuildConfig map[string]BazelConversionConfigEntry
 type BazelConversionConfigEntry int

 const (
 	// A sentinel value to be used as a key in Bp2BuildConfig for modules with
 	// no package path. This is also the module dir for top level Android.bp
 	// modules.
 	BP2BUILD_TOPLEVEL = "."

 	// iota + 1 ensures that the int value is not 0 when used in the Bp2buildAllowlist map,
 	// which can also mean that the key doesn't exist in a lookup.

 	// all modules in this package and subpackages default to bp2build_available: true.
 	// allows modules to opt-out.
 	Bp2BuildDefaultTrueRecursively BazelConversionConfigEntry = iota + 1

 	// all modules in this package (not recursively) default to bp2build_available: false.
 	// allows modules to opt-in.
 	Bp2BuildDefaultFalse
 )

 var (
 	// Keep any existing BUILD files (and do not generate new BUILD files) for these directories
 	// in the synthetic Bazel workspace.
 	bp2buildKeepExistingBuildFile = map[string]bool{
 		// This is actually build/bazel/build.BAZEL symlinked to ./BUILD
 		".":/*recursive = */ false,

 		// build/bazel/examples/apex/... BUILD files should be generated, so
 		// build/bazel is not recursive. Instead list each subdirectory under
 		// build/bazel explicitly.
 		"build/bazel":/* recursive = */ false,
 		"build/bazel/examples/android_app":/* recursive = */ true,
 		"build/bazel/bazel_skylib":/* recursive = */ true,
 		"build/bazel/rules":/* recursive = */ true,
 		"build/bazel/rules_cc":/* recursive = */ true,
 		"build/bazel/tests":/* recursive = */ true,
 		"build/bazel/platforms":/* recursive = */ true,
 		"build/bazel/product_variables":/* recursive = */ true,
 		"build/pesto":/* recursive = */ true,

 		// external/bazelbuild-rules_android/... is needed by mixed builds, otherwise mixed builds analysis fails
 		// e.g. ERROR: Analysis of target '@soong_injection//mixed_builds:buildroot' failed
 		"external/bazelbuild-rules_android":/* recursive = */ true,
 		"external/bazel-skylib":/* recursive = */ true,

 		"prebuilts/sdk":/* recursive = */ false,
 		"prebuilts/sdk/tools":/* recursive = */ false,
 		"prebuilts/r8":/* recursive = */ false,
 		"packages/apps/Music":/* recursive = */ true,
 	}

 	// Configure modules in these directories to enable bp2build_available: true or false by default.
 	bp2buildDefaultConfig = Bp2BuildConfig{
 		"bionic":                            Bp2BuildDefaultTrueRecursively,
 		"build/bazel/examples/apex/minimal": Bp2BuildDefaultTrueRecursively,
 		"external/gwp_asan":                 Bp2BuildDefaultTrueRecursively,
 		"system/core/libcutils":             Bp2BuildDefaultTrueRecursively,
 		"system/core/property_service/libpropertyinfoparser": Bp2BuildDefaultTrueRecursively,
 		"system/libbase":                  Bp2BuildDefaultTrueRecursively,
 		"system/logging/liblog":           Bp2BuildDefaultTrueRecursively,
 		"system/timezone/apex":            Bp2BuildDefaultTrueRecursively,
 		"system/timezone/output_data":     Bp2BuildDefaultTrueRecursively,
 		"external/arm-optimized-routines": Bp2BuildDefaultTrueRecursively,
 		"external/fmtlib":                 Bp2BuildDefaultTrueRecursively,
 		"external/jemalloc_new":           Bp2BuildDefaultTrueRecursively,
 		"external/libcxxabi":              Bp2BuildDefaultTrueRecursively,
 		"external/scudo":                  Bp2BuildDefaultTrueRecursively,
 		"prebuilts/clang/host/linux-x86":  Bp2BuildDefaultTrueRecursively,
 	}

 	// Per-module denylist to always opt modules out of both bp2build and mixed builds.
 	bp2buildModuleDoNotConvertList = []string{
 		// Things that transitively depend on unconverted libc_* modules.
 		"libbionic_spawn_benchmark", // http://b/186824595, cc_library_static, depends on //external/google-benchmark (http://b/186822740)
 		//                                                                also depends on //system/logging/liblog:liblog (http://b/186822772)

 		"libc_malloc_debug",           // http://b/186824339, cc_library_static, depends on //system/libbase:libbase (http://b/186823646)
 		"libc_malloc_debug_backtrace", // http://b/186824112, cc_library_static, depends on //external/libcxxabi:libc++demangle (http://b/186823773)

 		"libcutils",         // http://b/186827426, cc_library, depends on //system/core/libprocessgroup:libprocessgroup_headers (http://b/186826841)
 		"libcutils_sockets", // http://b/186826853, cc_library, depends on //system/libbase:libbase (http://b/186826479)

 		"liblinker_debuggerd_stub", // http://b/186824327, cc_library_static, depends on //external/zlib:libz (http://b/186823782)
 		//                                                               also depends on //system/libziparchive:libziparchive (http://b/186823656)
 		//                                                               also depends on //system/logging/liblog:liblog (http://b/186822772)
 		"liblinker_main", // http://b/186825989, cc_library_static, depends on //external/zlib:libz (http://b/186823782)
 		//                                                     also depends on //system/libziparchive:libziparchive (http://b/186823656)
 		//                                                     also depends on//system/logging/liblog:liblog (http://b/186822772)
 		"liblinker_malloc", // http://b/186826466, cc_library_static, depends on //external/zlib:libz (http://b/186823782)
 		//                                                       also depends on //system/libziparchive:libziparchive (http://b/186823656)
 		//                                                       also depends on //system/logging/liblog:liblog (http://b/186822772)
 		"libc_ndk",          // http://b/187013218, cc_library_static, depends on //bionic/libm:libm (http://b/183064661)
 		"libc_malloc_hooks", // http://b/187016307, cc_library, ld.lld: error: undefined symbol: __malloc_hook

 		// http://b/186823769: Needs C++ STL support, includes from unconverted standard libraries in //external/libcxx
 		// c++_static
 		"libbase_ndk", // http://b/186826477, cc_library, no such target '//build/bazel/platforms/os:darwin' when --platforms //build/bazel/platforms:android_x86 is added
 		// libcxx
 		"libBionicBenchmarksUtils", // cc_library_static, fatal error: 'map' file not found, from libcxx
 		"fmtlib",                   // cc_library_static, fatal error: 'cassert' file not found, from libcxx
 		"fmtlib_ndk",               // cc_library_static, fatal error: 'cassert' file not found
 		"liblog",                   // http://b/186822772: cc_library, 'sys/cdefs.h' file not found
 		"libbase",                  // Requires liblog. http://b/186826479, cc_library, fatal error: 'memory' file not found, from libcxx.
 		// Also depends on fmtlib.

 		"libseccomp_policy", // depends on libbase

 		"gwp_asan_crash_handler", // cc_library, ld.lld: error: undefined symbol: memset

 		// Tests. Handle later.
 		"libbionic_tests_headers_posix", // http://b/186024507, cc_library_static, sched.h, time.h not found
 		"libjemalloc5_integrationtest",
 		"libjemalloc5_stresstestlib",
 		"libjemalloc5_unittest",

 		// APEX support
 		"com.android.runtime", // http://b/194746715, apex, depends on 'libc_malloc_debug' and 'libc_malloc_hooks'
 	}

 	// Per-module denylist of cc_library modules to only generate the static
 	// variant if their shared variant isn't ready or buildable by Bazel.
 	bp2buildCcLibraryStaticOnlyList = []string{
 		"libstdc++",    // http://b/186822597, cc_library, ld.lld: error: undefined symbol: __errno
 		"libjemalloc5", // http://b/188503688, cc_library, `target: { android: { enabled: false } }` for android targets.
 	}

 	// Per-module denylist to opt modules out of mixed builds. Such modules will
 	// still be generated via bp2build.
 	mixedBuildsDisabledList = []string{
 		"libc++abi",      // http://b/195970501, cc_library_static, duplicate symbols because it propagates libc objects.
 		"libc++demangle", // http://b/195970501, cc_library_static, duplicate symbols because it propagates libc objects.
 	}

 	// Used for quicker lookups
 	bp2buildModuleDoNotConvert  = map[string]bool{}
 	bp2buildCcLibraryStaticOnly = map[string]bool{}
 	mixedBuildsDisabled         = map[string]bool{}
 )

 func init() {
 	for _, moduleName := range bp2buildModuleDoNotConvertList {
 		bp2buildModuleDoNotConvert[moduleName] = true
 	}

 	for _, moduleName := range bp2buildCcLibraryStaticOnlyList {
 		bp2buildCcLibraryStaticOnly[moduleName] = true
 	}

 	for _, moduleName := range mixedBuildsDisabledList {
 		mixedBuildsDisabled[moduleName] = true
 	}
 }

 func GenerateCcLibraryStaticOnly(ctx BazelConversionPathContext) bool {
 	return bp2buildCcLibraryStaticOnly[ctx.Module().Name()]
 }

 func ShouldKeepExistingBuildFileForDir(dir string) bool {
 	if _, ok := bp2buildKeepExistingBuildFile[dir]; ok {
 		// Exact dir match
 		return true
 	}
 	// Check if subtree match
 	for prefix, recursive := range bp2buildKeepExistingBuildFile {
 		if recursive {
 			if strings.HasPrefix(dir, prefix+"/") {
 				return true
 			}
 		}
 	}
 	// Default
 	return false
 }

 // MixedBuildsEnabled checks that a module is ready to be replaced by a
 // converted or handcrafted Bazel target.
 func (b *BazelModuleBase) MixedBuildsEnabled(ctx BazelConversionPathContext) bool {
 	if !ctx.Config().BazelContext.BazelEnabled() {
 		return false
 	}
 	if len(b.GetBazelLabel(ctx, ctx.Module())) == 0 {
 		return false
 	}
 	if GenerateCcLibraryStaticOnly(ctx) {
 		// Don't use partially-converted cc_library targets in mixed builds,
 		// since mixed builds would generally rely on both static and shared
 		// variants of a cc_library.
 		return false
 	}
 	return !mixedBuildsDisabled[ctx.Module().Name()]
 }

 // ConvertWithBp2build returns whether the given BazelModuleBase should be converted with bp2build.
 func (b *BazelModuleBase) ConvertWithBp2build(ctx BazelConversionPathContext) bool {
 	if bp2buildModuleDoNotConvert[ctx.Module().Name()] {
 		return false
 	}

 	// Ensure that the module type of this module has a bp2build converter. This
 	// prevents mixed builds from using auto-converted modules just by matching
 	// the package dir; it also has to have a bp2build mutator as well.
 	if ctx.Config().bp2buildModuleTypeConfig[ctx.ModuleType()] == false {
 		return false
 	}

 	packagePath := ctx.ModuleDir()
 	config := ctx.Config().bp2buildPackageConfig

 	// This is a tristate value: true, false, or unset.
 	propValue := b.bazelProperties.Bazel_module.Bp2build_available
 	if bp2buildDefaultTrueRecursively(packagePath, config) {
 		// Allow modules to explicitly opt-out.
 		return proptools.BoolDefault(propValue, true)
 	}

 	// Allow modules to explicitly opt-in.
 	return proptools.BoolDefault(propValue, false)
 }

 // bp2buildDefaultTrueRecursively checks that the package contains a prefix from the
 // set of package prefixes where all modules must be converted. That is, if the
 // package is x/y/z, and the list contains either x, x/y, or x/y/z, this function will
 // return true.
 //
 // However, if the package is x/y, and it matches a Bp2BuildDefaultFalse "x/y" entry
 // exactly, this module will return false early.
 //
 // This function will also return false if the package doesn't match anything in
 // the config.
 func bp2buildDefaultTrueRecursively(packagePath string, config Bp2BuildConfig) bool {
 	ret := false

 	// Return exact matches in the config.
 	if config[packagePath] == Bp2BuildDefaultTrueRecursively {
 		return true
 	}
 	if config[packagePath] == Bp2BuildDefaultFalse {
 		return false
 	}

 	// If not, check for the config recursively.
 	packagePrefix := ""
 	// e.g. for x/y/z, iterate over x, x/y, then x/y/z, taking the final value from the allowlist.
 	for _, part := range strings.Split(packagePath, "/") {
 		packagePrefix += part
 		if config[packagePrefix] == Bp2BuildDefaultTrueRecursively {
 			// package contains this prefix and this prefix should convert all modules
 			return true
 		}
 		// Continue to the next part of the package dir.
 		packagePrefix += "/"
 	}

 	return ret
 }

 // GetBazelBuildFileContents returns the file contents of a hand-crafted BUILD file if available or
 // an error if there are errors reading the file.
 // TODO(b/181575318): currently we append the whole BUILD file, let's change that to do
 // something more targeted based on the rule type and target.
 func (b *BazelModuleBase) GetBazelBuildFileContents(c Config, path, name string) (string, error) {
 	if !strings.Contains(b.HandcraftedLabel(), path) {
 		return "", fmt.Errorf("%q not found in bazel_module.label %q", path, b.HandcraftedLabel())
 	}
 	name = filepath.Join(path, name)
 	f, err := c.fs.Open(name)
 	if err != nil {
 		return "", err
 	}
 	defer f.Close()

 	data, err := ioutil.ReadAll(f)
 	if err != nil {
 		return "", err
 	}
 	return string(data[:]), nil
 }

 // ConvertedToBazel returns whether this module has been converted to Bazel, whether automatically
 // or manually
 func (b *BazelModuleBase) ConvertedToBazel(ctx BazelConversionPathContext) bool {
 	return b.ConvertWithBp2build(ctx) || b.HasHandcraftedLabel()
 }
	// 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"
	"io/ioutil"
	"path/filepath"
	"strings"

	"github.com/google/blueprint"
	"github.com/google/blueprint/proptools"
	)

	type bazelModuleProperties struct {
	// The label of the Bazel target replacing this Soong module. When run in conversion mode, this
	// will import the handcrafted build target into the autogenerated file. Note: this may result in
	// a conflict due to duplicate targets if bp2build_available is also set.
	Label *string

	// If true, bp2build will generate the converted Bazel target for this module. Note: this may
	// cause a conflict due to the duplicate targets if label is also set.
	//
	// This is a bool pointer to support tristates: true, false, not set.
	//
	// To opt-in a module, set bazel_module: { bp2build_available: true }
	// To opt-out a module, set bazel_module: { bp2build_available: false }
	// To defer the default setting for the directory, do not set the value.
	Bp2build_available *bool
	}

	// Properties contains common module properties for Bazel migration purposes.
	type properties struct {
	// In USE_BAZEL_ANALYSIS=1 mode, this represents the Bazel target replacing
	// this Soong module.
	Bazel_module bazelModuleProperties
	}

	// BazelModuleBase contains the property structs with metadata for modules which can be converted to
	// Bazel.
	type BazelModuleBase struct {
	bazelProperties properties
	}

	// Bazelable is specifies the interface for modules that can be converted to Bazel.
	type Bazelable interface {
	bazelProps() *properties
	HasHandcraftedLabel() bool
	HandcraftedLabel() string
	GetBazelLabel(ctx BazelConversionPathContext, module blueprint.Module) string
	ConvertWithBp2build(ctx BazelConversionPathContext) bool
	GetBazelBuildFileContents(c Config, path, name string) (string, error)
	ConvertedToBazel(ctx BazelConversionPathContext) bool
	}

	// BazelModule is a lightweight wrapper interface around Module for Bazel-convertible modules.
	type BazelModule interface {
	Module
	Bazelable
	}

	// InitBazelModule is a wrapper function that decorates a BazelModule with Bazel-conversion
	// properties.
	func InitBazelModule(module BazelModule) {
	module.AddProperties(module.bazelProps())
	}

	// bazelProps returns the Bazel properties for the given BazelModuleBase.
	func (b BazelModuleBase) bazelProps() properties {
	return &b.bazelProperties
	}

	// HasHandcraftedLabel returns whether this module has a handcrafted Bazel label.
	func (b *BazelModuleBase) HasHandcraftedLabel() bool {
	return b.bazelProperties.Bazel_module.Label != nil
	}

	// HandcraftedLabel returns the handcrafted label for this module, or empty string if there is none
	func (b *BazelModuleBase) HandcraftedLabel() string {
	return proptools.String(b.bazelProperties.Bazel_module.Label)
	}

	// GetBazelLabel returns the Bazel label for the given BazelModuleBase.
	func (b *BazelModuleBase) GetBazelLabel(ctx BazelConversionPathContext, module blueprint.Module) string {
	if b.HasHandcraftedLabel() {
	return b.HandcraftedLabel()
	}
	if b.ConvertWithBp2build(ctx) {
	return bp2buildModuleLabel(ctx, module)
	}
	return "" // no label for unconverted module
	}

	// Configuration to decide if modules in a directory should default to true/false for bp2build_available
	type Bp2BuildConfig map[string]BazelConversionConfigEntry
	type BazelConversionConfigEntry int

	const (
	// A sentinel value to be used as a key in Bp2BuildConfig for modules with
	// no package path. This is also the module dir for top level Android.bp
	// modules.
	BP2BUILD_TOPLEVEL = "."

	// iota + 1 ensures that the int value is not 0 when used in the Bp2buildAllowlist map,
	// which can also mean that the key doesn't exist in a lookup.

	// all modules in this package and subpackages default to bp2build_available: true.
	// allows modules to opt-out.
	Bp2BuildDefaultTrueRecursively BazelConversionConfigEntry = iota + 1

	// all modules in this package (not recursively) default to bp2build_available: false.
	// allows modules to opt-in.
	Bp2BuildDefaultFalse
	)

	var (
	// Keep any existing BUILD files (and do not generate new BUILD files) for these directories
	// in the synthetic Bazel workspace.
	bp2buildKeepExistingBuildFile = map[string]bool{
	// This is actually build/bazel/build.BAZEL symlinked to ./BUILD
	".":/recursive = / false,

	// build/bazel/examples/apex/... BUILD files should be generated, so
	// build/bazel is not recursive. Instead list each subdirectory under
	// build/bazel explicitly.
	"build/bazel":/* recursive = */ false,
	"build/bazel/examples/android_app":/* recursive = */ true,
	"build/bazel/bazel_skylib":/* recursive = */ true,
	"build/bazel/rules":/* recursive = */ true,
	"build/bazel/rules_cc":/* recursive = */ true,
	"build/bazel/tests":/* recursive = */ true,
	"build/bazel/platforms":/* recursive = */ true,
	"build/bazel/product_variables":/* recursive = */ true,
	"build/pesto":/* recursive = */ true,

	// external/bazelbuild-rules_android/... is needed by mixed builds, otherwise mixed builds analysis fails
	// e.g. ERROR: Analysis of target '@soong_injection//mixed_builds:buildroot' failed
	"external/bazelbuild-rules_android":/* recursive = */ true,
	"external/bazel-skylib":/* recursive = */ true,

	"prebuilts/sdk":/* recursive = */ false,
	"prebuilts/sdk/tools":/* recursive = */ false,
	"prebuilts/r8":/* recursive = */ false,
	"packages/apps/Music":/* recursive = */ true,
	}

	// Configure modules in these directories to enable bp2build_available: true or false by default.
	bp2buildDefaultConfig = Bp2BuildConfig{
	"bionic": Bp2BuildDefaultTrueRecursively,
	"build/bazel/examples/apex/minimal": Bp2BuildDefaultTrueRecursively,
	"external/gwp_asan": Bp2BuildDefaultTrueRecursively,
	"system/core/libcutils": Bp2BuildDefaultTrueRecursively,
	"system/core/property_service/libpropertyinfoparser": Bp2BuildDefaultTrueRecursively,
	"system/libbase": Bp2BuildDefaultTrueRecursively,
	"system/logging/liblog": Bp2BuildDefaultTrueRecursively,
	"system/timezone/apex": Bp2BuildDefaultTrueRecursively,
	"system/timezone/output_data": Bp2BuildDefaultTrueRecursively,
	"external/arm-optimized-routines": Bp2BuildDefaultTrueRecursively,
	"external/fmtlib": Bp2BuildDefaultTrueRecursively,
	"external/jemalloc_new": Bp2BuildDefaultTrueRecursively,
	"external/libcxxabi": Bp2BuildDefaultTrueRecursively,
	"external/scudo": Bp2BuildDefaultTrueRecursively,
	"prebuilts/clang/host/linux-x86": Bp2BuildDefaultTrueRecursively,
	}

	// Per-module denylist to always opt modules out of both bp2build and mixed builds.
	bp2buildModuleDoNotConvertList = []string{
	// Things that transitively depend on unconverted libc_* modules.
	"libbionic_spawn_benchmark", // http://b/186824595, cc_library_static, depends on //external/google-benchmark (http://b/186822740)
	// also depends on //system/logging/liblog:liblog (http://b/186822772)

	"libc_malloc_debug", // http://b/186824339, cc_library_static, depends on //system/libbase:libbase (http://b/186823646)
	"libc_malloc_debug_backtrace", // http://b/186824112, cc_library_static, depends on //external/libcxxabi:libc++demangle (http://b/186823773)

	"libcutils", // http://b/186827426, cc_library, depends on //system/core/libprocessgroup:libprocessgroup_headers (http://b/186826841)
	"libcutils_sockets", // http://b/186826853, cc_library, depends on //system/libbase:libbase (http://b/186826479)

	"liblinker_debuggerd_stub", // http://b/186824327, cc_library_static, depends on //external/zlib:libz (http://b/186823782)
	// also depends on //system/libziparchive:libziparchive (http://b/186823656)
	// also depends on //system/logging/liblog:liblog (http://b/186822772)
	"liblinker_main", // http://b/186825989, cc_library_static, depends on //external/zlib:libz (http://b/186823782)
	// also depends on //system/libziparchive:libziparchive (http://b/186823656)
	// also depends on//system/logging/liblog:liblog (http://b/186822772)
	"liblinker_malloc", // http://b/186826466, cc_library_static, depends on //external/zlib:libz (http://b/186823782)
	// also depends on //system/libziparchive:libziparchive (http://b/186823656)
	// also depends on //system/logging/liblog:liblog (http://b/186822772)
	"libc_ndk", // http://b/187013218, cc_library_static, depends on //bionic/libm:libm (http://b/183064661)
	"libc_malloc_hooks", // http://b/187016307, cc_library, ld.lld: error: undefined symbol: __malloc_hook

	// http://b/186823769: Needs C++ STL support, includes from unconverted standard libraries in //external/libcxx
	// c++_static
	"libbase_ndk", // http://b/186826477, cc_library, no such target '//build/bazel/platforms/os:darwin' when --platforms //build/bazel/platforms:android_x86 is added
	// libcxx
	"libBionicBenchmarksUtils", // cc_library_static, fatal error: 'map' file not found, from libcxx
	"fmtlib", // cc_library_static, fatal error: 'cassert' file not found, from libcxx
	"fmtlib_ndk", // cc_library_static, fatal error: 'cassert' file not found
	"liblog", // http://b/186822772: cc_library, 'sys/cdefs.h' file not found
	"libbase", // Requires liblog. http://b/186826479, cc_library, fatal error: 'memory' file not found, from libcxx.
	// Also depends on fmtlib.

	"libseccomp_policy", // depends on libbase

	"gwp_asan_crash_handler", // cc_library, ld.lld: error: undefined symbol: memset

	// Tests. Handle later.
	"libbionic_tests_headers_posix", // http://b/186024507, cc_library_static, sched.h, time.h not found
	"libjemalloc5_integrationtest",
	"libjemalloc5_stresstestlib",
	"libjemalloc5_unittest",

	// APEX support
	"com.android.runtime", // http://b/194746715, apex, depends on 'libc_malloc_debug' and 'libc_malloc_hooks'
	}

	// Per-module denylist of cc_library modules to only generate the static
	// variant if their shared variant isn't ready or buildable by Bazel.
	bp2buildCcLibraryStaticOnlyList = []string{
	"libstdc++", // http://b/186822597, cc_library, ld.lld: error: undefined symbol: __errno
	"libjemalloc5", // http://b/188503688, cc_library, `target: { android: { enabled: false } }` for android targets.
	}

	// Per-module denylist to opt modules out of mixed builds. Such modules will
	// still be generated via bp2build.
	mixedBuildsDisabledList = []string{
	"libc++abi", // http://b/195970501, cc_library_static, duplicate symbols because it propagates libc objects.
	"libc++demangle", // http://b/195970501, cc_library_static, duplicate symbols because it propagates libc objects.
	}

	// Used for quicker lookups
	bp2buildModuleDoNotConvert = map[string]bool{}
	bp2buildCcLibraryStaticOnly = map[string]bool{}
	mixedBuildsDisabled = map[string]bool{}
	)

	func init() {
	for _, moduleName := range bp2buildModuleDoNotConvertList {
	bp2buildModuleDoNotConvert[moduleName] = true
	}

	for _, moduleName := range bp2buildCcLibraryStaticOnlyList {
	bp2buildCcLibraryStaticOnly[moduleName] = true
	}

	for _, moduleName := range mixedBuildsDisabledList {
	mixedBuildsDisabled[moduleName] = true
	}
	}

	func GenerateCcLibraryStaticOnly(ctx BazelConversionPathContext) bool {
	return bp2buildCcLibraryStaticOnly[ctx.Module().Name()]
	}

	func ShouldKeepExistingBuildFileForDir(dir string) bool {
	if _, ok := bp2buildKeepExistingBuildFile[dir]; ok {
	// Exact dir match
	return true
	}
	// Check if subtree match
	for prefix, recursive := range bp2buildKeepExistingBuildFile {
	if recursive {
	if strings.HasPrefix(dir, prefix+"/") {
	return true
	}
	}
	}
	// Default
	return false
	}

	// MixedBuildsEnabled checks that a module is ready to be replaced by a
	// converted or handcrafted Bazel target.
	func (b *BazelModuleBase) MixedBuildsEnabled(ctx BazelConversionPathContext) bool {
	if !ctx.Config().BazelContext.BazelEnabled() {
	return false
	}
	if len(b.GetBazelLabel(ctx, ctx.Module())) == 0 {
	return false
	}
	if GenerateCcLibraryStaticOnly(ctx) {
	// Don't use partially-converted cc_library targets in mixed builds,
	// since mixed builds would generally rely on both static and shared
	// variants of a cc_library.
	return false
	}
	return !mixedBuildsDisabled[ctx.Module().Name()]
	}

	// ConvertWithBp2build returns whether the given BazelModuleBase should be converted with bp2build.
	func (b *BazelModuleBase) ConvertWithBp2build(ctx BazelConversionPathContext) bool {
	if bp2buildModuleDoNotConvert[ctx.Module().Name()] {
	return false
	}

	// Ensure that the module type of this module has a bp2build converter. This
	// prevents mixed builds from using auto-converted modules just by matching
	// the package dir; it also has to have a bp2build mutator as well.
	if ctx.Config().bp2buildModuleTypeConfig[ctx.ModuleType()] == false {
	return false
	}

	packagePath := ctx.ModuleDir()
	config := ctx.Config().bp2buildPackageConfig

	// This is a tristate value: true, false, or unset.
	propValue := b.bazelProperties.Bazel_module.Bp2build_available
	if bp2buildDefaultTrueRecursively(packagePath, config) {
	// Allow modules to explicitly opt-out.
	return proptools.BoolDefault(propValue, true)
	}

	// Allow modules to explicitly opt-in.
	return proptools.BoolDefault(propValue, false)
	}

	// bp2buildDefaultTrueRecursively checks that the package contains a prefix from the
	// set of package prefixes where all modules must be converted. That is, if the
	// package is x/y/z, and the list contains either x, x/y, or x/y/z, this function will
	// return true.
	//
	// However, if the package is x/y, and it matches a Bp2BuildDefaultFalse "x/y" entry
	// exactly, this module will return false early.
	//
	// This function will also return false if the package doesn't match anything in
	// the config.
	func bp2buildDefaultTrueRecursively(packagePath string, config Bp2BuildConfig) bool {
	ret := false

	// Return exact matches in the config.
	if config[packagePath] == Bp2BuildDefaultTrueRecursively {
	return true
	}
	if config[packagePath] == Bp2BuildDefaultFalse {
	return false
	}

	// If not, check for the config recursively.
	packagePrefix := ""
	// e.g. for x/y/z, iterate over x, x/y, then x/y/z, taking the final value from the allowlist.
	for _, part := range strings.Split(packagePath, "/") {
	packagePrefix += part
	if config[packagePrefix] == Bp2BuildDefaultTrueRecursively {
	// package contains this prefix and this prefix should convert all modules
	return true
	}
	// Continue to the next part of the package dir.
	packagePrefix += "/"
	}

	return ret
	}

	// GetBazelBuildFileContents returns the file contents of a hand-crafted BUILD file if available or
	// an error if there are errors reading the file.
	// TODO(b/181575318): currently we append the whole BUILD file, let's change that to do
	// something more targeted based on the rule type and target.
	func (b *BazelModuleBase) GetBazelBuildFileContents(c Config, path, name string) (string, error) {
	if !strings.Contains(b.HandcraftedLabel(), path) {
	return "", fmt.Errorf("%q not found in bazel_module.label %q", path, b.HandcraftedLabel())
	}
	name = filepath.Join(path, name)
	f, err := c.fs.Open(name)
	if err != nil {
	return "", err
	}
	defer f.Close()

	data, err := ioutil.ReadAll(f)
	if err != nil {
	return "", err
	}
	return string(data[:]), nil
	}

	// ConvertedToBazel returns whether this module has been converted to Bazel, whether automatically
	// or manually
	func (b *BazelModuleBase) ConvertedToBazel(ctx BazelConversionPathContext) bool {
	return b.ConvertWithBp2build(ctx) \|\| b.HasHandcraftedLabel()
	}