android/bazel.go - platform/build/soong - Git at Google

 // 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 (
 	// Do not write BUILD files for these directories
 	// NOTE: this is not recursive
 	bp2buildDoNotWriteBuildFileList = []string{
 		// Don't generate these BUILD files - because external BUILD files already exist
 		"external/boringssl",
 		"external/brotli",
 		"external/dagger2",
 		"external/flatbuffers",
 		"external/gflags",
 		"external/google-fruit",
 		"external/grpc-grpc",
 		"external/grpc-grpc/test/core/util",
 		"external/grpc-grpc/test/cpp/common",
 		"external/grpc-grpc/third_party/address_sorting",
 		"external/nanopb-c",
 		"external/nos/host/generic",
 		"external/nos/host/generic/libnos",
 		"external/nos/host/generic/libnos/generator",
 		"external/nos/host/generic/libnos_datagram",
 		"external/nos/host/generic/libnos_transport",
 		"external/nos/host/generic/nugget/proto",
 		"external/perfetto",
 		"external/protobuf",
 		"external/rust/cxx",
 		"external/rust/cxx/demo",
 		"external/ruy",
 		"external/tensorflow",
 		"external/tensorflow/tensorflow/lite",
 		"external/tensorflow/tensorflow/lite/java",
 		"external/tensorflow/tensorflow/lite/kernels",
 		"external/tflite-support",
 		"external/tinyalsa_new",
 		"external/wycheproof",
 		"external/libyuv",
 	}

 	// Configure modules in these directories to enable bp2build_available: true or false by default.
 	bp2buildDefaultConfig = Bp2BuildConfig{
 		"bionic":                Bp2BuildDefaultTrueRecursively,
 		"external/gwp_asan":     Bp2BuildDefaultTrueRecursively,
 		"system/core/libcutils": Bp2BuildDefaultTrueRecursively,
 		"system/logging/liblog": Bp2BuildDefaultTrueRecursively,
 	}

 	// Per-module denylist to always opt modules out of both bp2build and mixed builds.
 	bp2buildModuleDoNotConvertList = []string{
 		"libBionicBenchmarksUtils",      // ruperts@, cc_library_static, 'map' file not found
 		"libbionic_spawn_benchmark",     // ruperts@, cc_library_static, depends on //system/libbase
 		"libc_jemalloc_wrapper",         // ruperts@, cc_library_static, depends on //external/jemalloc_new
 		"libc_bootstrap",                // ruperts@, cc_library_static, 'private/bionic_auxv.h' file not found
 		"libc_init_static",              // ruperts@, cc_library_static, 'private/bionic_elf_tls.h' file not found
 		"libc_init_dynamic",             // ruperts@, cc_library_static, 'private/bionic_defs.h' file not found
 		"libc_tzcode",                   // ruperts@, cc_library_static, error: expected expression
 		"libc_netbsd",                   // ruperts@, cc_library_static, 'engine.c' file not found
 		"libc_fortify",                  // ruperts@, cc_library_static, 'private/bionic_fortify.h' file not found
 		"libc_bionic",                   // ruperts@, cc_library_static, 'private/bionic_asm.h' file not found
 		"libc_bionic_ndk",               // ruperts@, cc_library_static, depends on //bionic/libc/system_properties
 		"libc_bionic_systrace",          // ruperts@, cc_library_static, 'private/bionic_systrace.h' file not found
 		"libc_pthread",                  // ruperts@, cc_library_static, 'private/bionic_defs.h' file not found
 		"libc_syscalls",                 // eakammer@, cc_library_static,  'private/bionic_asm.h' file not found
 		"libc_ndk",                      // ruperts@, cc_library_static, depends on //bionic/libm:libm
 		"libc_nopthread",                // ruperts@, cc_library_static, depends on //external/arm-optimized-routines
 		"libc_common",                   // ruperts@, cc_library_static, depends on //bionic/libc:libc_nopthread
 		"libc_common_static",            // ruperts@, cc_library_static, depends on //bionic/libc:libc_common
 		"libc_common_shared",            // ruperts@, cc_library_static, depends on //bionic/libc:libc_common
 		"libc_unwind_static",            // ruperts@, cc_library_static, 'private/bionic_elf_tls.h' file not found
 		"libc_nomalloc",                 // ruperts@, cc_library_static, depends on //bionic/libc:libc_common
 		"libasync_safe",                 // ruperts@, cc_library_static, 'private/CachedProperty.h' file not found
 		"libc_malloc_debug_backtrace",   // ruperts@, cc_library_static, depends on //system/libbase
 		"libsystemproperties",           // ruperts@, cc_library_static, depends on //system/core/property_service/libpropertyinfoparser
 		"libdl_static",                  // ruperts@, cc_library_static, 'private/CFIShadow.h' file not found
 		"liblinker_main",                // ruperts@, cc_library_static, depends on //system/libbase
 		"liblinker_malloc",              // ruperts@, cc_library_static, depends on //system/logging/liblog:liblog
 		"liblinker_debuggerd_stub",      // ruperts@, cc_library_static, depends on //system/libbase
 		"libbionic_tests_headers_posix", // ruperts@, cc_library_static, 'complex.h' file not found
 		"libc_dns",                      // ruperts@, cc_library_static, 'private/android_filesystem_config.h' file not found
 		"libc_static_dispatch",          // eakammer@, cc_library_static, 'private/bionic_asm.h' file not found
 		"libc_dynamic_dispatch",         // eakammer@, cc_library_static, 'private/bionic_ifuncs.h' file not found
 		"note_memtag_heap_async",        // jingwen@, cc_library_static, 'private/bionic_asm.h' file not found (arm64)
 		"note_memtag_heap_sync",         // jingwen@, cc_library_static, 'private/bionic_asm.h' file not found (arm64)

 		// List of all full_cc_libraries in //bionic, with their immediate failures
 		"libc",              // jingwen@, cc_library, depends on //external/gwp_asan
 		"libc_malloc_debug", // jingwen@, cc_library, fatal error: 'assert.h' file not found
 		"libc_malloc_hooks", // jingwen@, cc_library, fatal error: 'errno.h' file not found
 		"libdl",             // jingwen@, cc_library, ld.lld: error: no input files
 		"libm",              // lberki@, cc_library, compiler error: "Unexpected token in argument list"
 		"libseccomp_policy", // lberki@, cc_library, 'linux/filter.h' not found, caused by missing -isystem bionic/libc/kernel/uapi, dunno where it comes from in Soong
 		"libstdc++",         // jingwen@, cc_library, depends on //external/gwp_asan
 	}

 	// Per-module denylist to opt modules out of mixed builds. Such modules will
 	// still be generated via bp2build.
 	mixedBuildsDisabledList = []string{
 		"libc_gdtoa",   // ruperts@, cc_library_static, OK for bp2build but undefined symbol: __strtorQ for mixed builds
 		"libc_openbsd", // ruperts@, cc_library_static, OK for bp2build but error: duplicate symbol: strcpy for mixed builds
 	}

 	// Used for quicker lookups
 	bp2buildDoNotWriteBuildFile = map[string]bool{}
 	bp2buildModuleDoNotConvert  = map[string]bool{}
 	mixedBuildsDisabled         = map[string]bool{}
 )

 func init() {
 	for _, moduleName := range bp2buildDoNotWriteBuildFileList {
 		bp2buildDoNotWriteBuildFile[moduleName] = true
 	}

 	for _, moduleName := range bp2buildModuleDoNotConvertList {
 		bp2buildModuleDoNotConvert[moduleName] = true
 	}

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

 func ShouldWriteBuildFileForDir(dir string) bool {
 	if _, ok := bp2buildDoNotWriteBuildFile[dir]; ok {
 		return false
 	} else {
 		return true
 	}
 }

 // 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
 	}
 	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 (
	// Do not write BUILD files for these directories
	// NOTE: this is not recursive
	bp2buildDoNotWriteBuildFileList = []string{
	// Don't generate these BUILD files - because external BUILD files already exist
	"external/boringssl",
	"external/brotli",
	"external/dagger2",
	"external/flatbuffers",
	"external/gflags",
	"external/google-fruit",
	"external/grpc-grpc",
	"external/grpc-grpc/test/core/util",
	"external/grpc-grpc/test/cpp/common",
	"external/grpc-grpc/third_party/address_sorting",
	"external/nanopb-c",
	"external/nos/host/generic",
	"external/nos/host/generic/libnos",
	"external/nos/host/generic/libnos/generator",
	"external/nos/host/generic/libnos_datagram",
	"external/nos/host/generic/libnos_transport",
	"external/nos/host/generic/nugget/proto",
	"external/perfetto",
	"external/protobuf",
	"external/rust/cxx",
	"external/rust/cxx/demo",
	"external/ruy",
	"external/tensorflow",
	"external/tensorflow/tensorflow/lite",
	"external/tensorflow/tensorflow/lite/java",
	"external/tensorflow/tensorflow/lite/kernels",
	"external/tflite-support",
	"external/tinyalsa_new",
	"external/wycheproof",
	"external/libyuv",
	}

	// Configure modules in these directories to enable bp2build_available: true or false by default.
	bp2buildDefaultConfig = Bp2BuildConfig{
	"bionic": Bp2BuildDefaultTrueRecursively,
	"external/gwp_asan": Bp2BuildDefaultTrueRecursively,
	"system/core/libcutils": Bp2BuildDefaultTrueRecursively,
	"system/logging/liblog": Bp2BuildDefaultTrueRecursively,
	}

	// Per-module denylist to always opt modules out of both bp2build and mixed builds.
	bp2buildModuleDoNotConvertList = []string{
	"libBionicBenchmarksUtils", // ruperts@, cc_library_static, 'map' file not found
	"libbionic_spawn_benchmark", // ruperts@, cc_library_static, depends on //system/libbase
	"libc_jemalloc_wrapper", // ruperts@, cc_library_static, depends on //external/jemalloc_new
	"libc_bootstrap", // ruperts@, cc_library_static, 'private/bionic_auxv.h' file not found
	"libc_init_static", // ruperts@, cc_library_static, 'private/bionic_elf_tls.h' file not found
	"libc_init_dynamic", // ruperts@, cc_library_static, 'private/bionic_defs.h' file not found
	"libc_tzcode", // ruperts@, cc_library_static, error: expected expression
	"libc_netbsd", // ruperts@, cc_library_static, 'engine.c' file not found
	"libc_fortify", // ruperts@, cc_library_static, 'private/bionic_fortify.h' file not found
	"libc_bionic", // ruperts@, cc_library_static, 'private/bionic_asm.h' file not found
	"libc_bionic_ndk", // ruperts@, cc_library_static, depends on //bionic/libc/system_properties
	"libc_bionic_systrace", // ruperts@, cc_library_static, 'private/bionic_systrace.h' file not found
	"libc_pthread", // ruperts@, cc_library_static, 'private/bionic_defs.h' file not found
	"libc_syscalls", // eakammer@, cc_library_static, 'private/bionic_asm.h' file not found
	"libc_ndk", // ruperts@, cc_library_static, depends on //bionic/libm:libm
	"libc_nopthread", // ruperts@, cc_library_static, depends on //external/arm-optimized-routines
	"libc_common", // ruperts@, cc_library_static, depends on //bionic/libc:libc_nopthread
	"libc_common_static", // ruperts@, cc_library_static, depends on //bionic/libc:libc_common
	"libc_common_shared", // ruperts@, cc_library_static, depends on //bionic/libc:libc_common
	"libc_unwind_static", // ruperts@, cc_library_static, 'private/bionic_elf_tls.h' file not found
	"libc_nomalloc", // ruperts@, cc_library_static, depends on //bionic/libc:libc_common
	"libasync_safe", // ruperts@, cc_library_static, 'private/CachedProperty.h' file not found
	"libc_malloc_debug_backtrace", // ruperts@, cc_library_static, depends on //system/libbase
	"libsystemproperties", // ruperts@, cc_library_static, depends on //system/core/property_service/libpropertyinfoparser
	"libdl_static", // ruperts@, cc_library_static, 'private/CFIShadow.h' file not found
	"liblinker_main", // ruperts@, cc_library_static, depends on //system/libbase
	"liblinker_malloc", // ruperts@, cc_library_static, depends on //system/logging/liblog:liblog
	"liblinker_debuggerd_stub", // ruperts@, cc_library_static, depends on //system/libbase
	"libbionic_tests_headers_posix", // ruperts@, cc_library_static, 'complex.h' file not found
	"libc_dns", // ruperts@, cc_library_static, 'private/android_filesystem_config.h' file not found
	"libc_static_dispatch", // eakammer@, cc_library_static, 'private/bionic_asm.h' file not found
	"libc_dynamic_dispatch", // eakammer@, cc_library_static, 'private/bionic_ifuncs.h' file not found
	"note_memtag_heap_async", // jingwen@, cc_library_static, 'private/bionic_asm.h' file not found (arm64)
	"note_memtag_heap_sync", // jingwen@, cc_library_static, 'private/bionic_asm.h' file not found (arm64)

	// List of all full_cc_libraries in //bionic, with their immediate failures
	"libc", // jingwen@, cc_library, depends on //external/gwp_asan
	"libc_malloc_debug", // jingwen@, cc_library, fatal error: 'assert.h' file not found
	"libc_malloc_hooks", // jingwen@, cc_library, fatal error: 'errno.h' file not found
	"libdl", // jingwen@, cc_library, ld.lld: error: no input files
	"libm", // lberki@, cc_library, compiler error: "Unexpected token in argument list"
	"libseccomp_policy", // lberki@, cc_library, 'linux/filter.h' not found, caused by missing -isystem bionic/libc/kernel/uapi, dunno where it comes from in Soong
	"libstdc++", // jingwen@, cc_library, depends on //external/gwp_asan
	}

	// Per-module denylist to opt modules out of mixed builds. Such modules will
	// still be generated via bp2build.
	mixedBuildsDisabledList = []string{
	"libc_gdtoa", // ruperts@, cc_library_static, OK for bp2build but undefined symbol: __strtorQ for mixed builds
	"libc_openbsd", // ruperts@, cc_library_static, OK for bp2build but error: duplicate symbol: strcpy for mixed builds
	}

	// Used for quicker lookups
	bp2buildDoNotWriteBuildFile = map[string]bool{}
	bp2buildModuleDoNotConvert = map[string]bool{}
	mixedBuildsDisabled = map[string]bool{}
	)

	func init() {
	for _, moduleName := range bp2buildDoNotWriteBuildFileList {
	bp2buildDoNotWriteBuildFile[moduleName] = true
	}

	for _, moduleName := range bp2buildModuleDoNotConvertList {
	bp2buildModuleDoNotConvert[moduleName] = true
	}

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

	func ShouldWriteBuildFileForDir(dir string) bool {
	if _, ok := bp2buildDoNotWriteBuildFile[dir]; ok {
	return false
	} else {
	return true
	}
	}

	// 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
	}
	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()
	}