// Copyright 2016 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 cc import ( "path/filepath" "android/soong/bazel/cquery" "github.com/google/blueprint" "github.com/google/blueprint/proptools" "android/soong/android" "android/soong/bazel" ) type BinaryLinkerProperties struct { // compile executable with -static Static_executable *bool `android:"arch_variant"` // set the name of the output Stem *string `android:"arch_variant"` // append to the name of the output Suffix *string `android:"arch_variant"` // if set, add an extra objcopy --prefix-symbols= step Prefix_symbols *string // if set, install a symlink to the preferred architecture Symlink_preferred_arch *bool `android:"arch_variant"` // install symlinks to the binary. Symlink names will have the suffix and the binary // extension (if any) appended Symlinks []string `android:"arch_variant"` // override the dynamic linker DynamicLinker string `blueprint:"mutated"` // Names of modules to be overridden. Listed modules can only be other binaries // (in Make or Soong). // This does not completely prevent installation of the overridden binaries, but if both // binaries would be installed by default (in PRODUCT_PACKAGES) the other binary will be removed // from PRODUCT_PACKAGES. Overrides []string // Inject boringssl hash into the shared library. This is only intended for use by external/boringssl. Inject_bssl_hash *bool `android:"arch_variant"` } func init() { RegisterBinaryBuildComponents(android.InitRegistrationContext) } func RegisterBinaryBuildComponents(ctx android.RegistrationContext) { ctx.RegisterModuleType("cc_binary", BinaryFactory) ctx.RegisterModuleType("cc_binary_host", BinaryHostFactory) } // cc_binary produces a binary that is runnable on a device. func BinaryFactory() android.Module { module, _ := newBinary(android.HostAndDeviceSupported, true) module.bazelHandler = &ccBinaryBazelHandler{module: module} return module.Init() } // cc_binary_host produces a binary that is runnable on a host. func BinaryHostFactory() android.Module { module, _ := newBinary(android.HostSupported, true) return module.Init() } // // Executables // // binaryDecorator is a decorator containing information for C++ binary modules. type binaryDecorator struct { *baseLinker *baseInstaller stripper Stripper Properties BinaryLinkerProperties toolPath android.OptionalPath // Location of the linked, unstripped binary unstrippedOutputFile android.Path // Names of symlinks to be installed for use in LOCAL_MODULE_SYMLINKS symlinks []string // If the module has symlink_preferred_arch set, the name of the symlink to the // binary for the preferred arch. preferredArchSymlink string // Output archive of gcno coverage information coverageOutputFile android.OptionalPath // Location of the files that should be copied to dist dir when requested distFiles android.TaggedDistFiles // Action command lines to run directly after the binary is installed. For example, // may be used to symlink runtime dependencies (such as bionic) alongside installation. postInstallCmds []string } var _ linker = (*binaryDecorator)(nil) // linkerProps returns the list of individual properties objects relevant // for this binary. func (binary *binaryDecorator) linkerProps() []interface{} { return append(binary.baseLinker.linkerProps(), &binary.Properties, &binary.stripper.StripProperties) } // getStemWithoutSuffix returns the main section of the name to use for the symlink of // the main output file of this binary module. This may be derived from the module name // or other property overrides. // For the full symlink name, the `Suffix` property of a binary module must be appended. func (binary *binaryDecorator) getStemWithoutSuffix(ctx BaseModuleContext) string { stem := ctx.baseModuleName() if String(binary.Properties.Stem) != "" { stem = String(binary.Properties.Stem) } return stem } // getStem returns the full name to use for the symlink of the main output file of this binary // module. This may be derived from the module name and/or other property overrides. func (binary *binaryDecorator) getStem(ctx BaseModuleContext) string { return binary.getStemWithoutSuffix(ctx) + String(binary.Properties.Suffix) } // linkerDeps augments and returns the given `deps` to contain dependencies on // modules common to most binaries, such as bionic libraries. func (binary *binaryDecorator) linkerDeps(ctx DepsContext, deps Deps) Deps { deps = binary.baseLinker.linkerDeps(ctx, deps) if binary.baseLinker.Properties.crt() { if binary.static() { deps.CrtBegin = ctx.toolchain().CrtBeginStaticBinary() deps.CrtEnd = ctx.toolchain().CrtEndStaticBinary() } else { deps.CrtBegin = ctx.toolchain().CrtBeginSharedBinary() deps.CrtEnd = ctx.toolchain().CrtEndSharedBinary() } } if binary.static() { deps.StaticLibs = append(deps.StaticLibs, deps.SystemSharedLibs...) } if ctx.toolchain().Bionic() { if binary.static() { if ctx.selectedStl() == "libc++_static" { deps.StaticLibs = append(deps.StaticLibs, "libm", "libc") } // static libraries libcompiler_rt, libc and libc_nomalloc need to be linked with // --start-group/--end-group along with libgcc. If they are in deps.StaticLibs, // move them to the beginning of deps.LateStaticLibs var groupLibs []string deps.StaticLibs, groupLibs = filterList(deps.StaticLibs, []string{"libc", "libc_nomalloc", "libcompiler_rt"}) deps.LateStaticLibs = append(groupLibs, deps.LateStaticLibs...) } if ctx.Os() == android.LinuxBionic && !binary.static() { deps.DynamicLinker = "linker" } } if !binary.static() && inList("libc", deps.StaticLibs) { ctx.ModuleErrorf("statically linking libc to dynamic executable, please remove libc\n" + "from static libs or set static_executable: true") } return deps } // NewBinary builds and returns a new Module corresponding to a C++ binary. // Individual module implementations which comprise a C++ binary should call this function, // set some fields on the result, and then call the Init function. func NewBinary(hod android.HostOrDeviceSupported) (*Module, *binaryDecorator) { return newBinary(hod, true) } func newBinary(hod android.HostOrDeviceSupported, bazelable bool) (*Module, *binaryDecorator) { module := newModule(hod, android.MultilibFirst) binary := &binaryDecorator{ baseLinker: NewBaseLinker(module.sanitize), baseInstaller: NewBaseInstaller("bin", "", InstallInSystem), } module.compiler = NewBaseCompiler() module.linker = binary module.installer = binary module.bazelable = bazelable // Allow module to be added as member of an sdk/module_exports. module.sdkMemberTypes = []android.SdkMemberType{ ccBinarySdkMemberType, } return module, binary } // linkerInit initializes dynamic properties of the linker (such as runpath) based // on properties of this binary. func (binary *binaryDecorator) linkerInit(ctx BaseModuleContext) { binary.baseLinker.linkerInit(ctx) if ctx.Os().Linux() && ctx.Host() { // Unless explicitly specified otherwise, host static binaries are built with -static // if HostStaticBinaries is true for the product configuration. if binary.Properties.Static_executable == nil && ctx.Config().HostStaticBinaries() { binary.Properties.Static_executable = BoolPtr(true) } } if ctx.Darwin() || ctx.Windows() { // Static executables are not supported on Darwin or Windows binary.Properties.Static_executable = nil } } func (binary *binaryDecorator) static() bool { return Bool(binary.Properties.Static_executable) } func (binary *binaryDecorator) staticBinary() bool { return binary.static() } func (binary *binaryDecorator) binary() bool { return true } // linkerFlags returns a Flags object containing linker flags that are defined // by this binary, or that are implied by attributes of this binary. These flags are // combined with the given flags. func (binary *binaryDecorator) linkerFlags(ctx ModuleContext, flags Flags) Flags { flags = binary.baseLinker.linkerFlags(ctx, flags) // Passing -pie to clang for Windows binaries causes a warning that -pie is unused. if ctx.Host() && !ctx.Windows() && !binary.static() { if !ctx.Config().IsEnvTrue("DISABLE_HOST_PIE") { flags.Global.LdFlags = append(flags.Global.LdFlags, "-pie") } } // MinGW spits out warnings about -fPIC even for -fpie?!) being ignored because // all code is position independent, and then those warnings get promoted to // errors. if !ctx.Windows() { flags.Global.CFlags = append(flags.Global.CFlags, "-fPIE") } if ctx.toolchain().Bionic() { if binary.static() { // Clang driver needs -static to create static executable. // However, bionic/linker uses -shared to overwrite. // Linker for x86 targets does not allow coexistance of -static and -shared, // so we add -static only if -shared is not used. if !inList("-shared", flags.Local.LdFlags) { flags.Global.LdFlags = append(flags.Global.LdFlags, "-static") } flags.Global.LdFlags = append(flags.Global.LdFlags, "-nostdlib", "-Bstatic", "-Wl,--gc-sections", ) } else { // not static if flags.DynamicLinker == "" { if binary.Properties.DynamicLinker != "" { flags.DynamicLinker = binary.Properties.DynamicLinker } else { switch ctx.Os() { case android.Android: if ctx.bootstrap() && !ctx.inRecovery() && !ctx.inRamdisk() && !ctx.inVendorRamdisk() { flags.DynamicLinker = "/system/bin/bootstrap/linker" } else { flags.DynamicLinker = "/system/bin/linker" } if flags.Toolchain.Is64Bit() { flags.DynamicLinker += "64" } case android.LinuxBionic: flags.DynamicLinker = "" default: ctx.ModuleErrorf("unknown dynamic linker") } } if ctx.Os() == android.LinuxBionic { // Use the dlwrap entry point, but keep _start around so // that it can be used by host_bionic_inject flags.Global.LdFlags = append(flags.Global.LdFlags, "-Wl,--entry=__dlwrap__start", "-Wl,--undefined=_start", ) } } flags.Global.LdFlags = append(flags.Global.LdFlags, "-pie", "-nostdlib", "-Bdynamic", "-Wl,--gc-sections", "-Wl,-z,nocopyreloc", ) } } else { // not bionic if binary.static() { flags.Global.LdFlags = append(flags.Global.LdFlags, "-static") } if ctx.Darwin() { flags.Global.LdFlags = append(flags.Global.LdFlags, "-Wl,-headerpad_max_install_names") } } return flags } // link registers actions to link this binary, and sets various fields // on this binary to reflect information that should be exported up the build // tree (for example, exported flags and include paths). func (binary *binaryDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path { fileName := binary.getStem(ctx) + flags.Toolchain.ExecutableSuffix() outputFile := android.PathForModuleOut(ctx, fileName) ret := outputFile var linkerDeps android.Paths if flags.DynamicLinker != "" { flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-dynamic-linker,"+flags.DynamicLinker) } else if (ctx.toolchain().Bionic() || ctx.toolchain().Musl()) && !binary.static() { flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,--no-dynamic-linker") } if ctx.Darwin() && deps.DarwinSecondArchOutput.Valid() { fatOutputFile := outputFile outputFile = android.PathForModuleOut(ctx, "pre-fat", fileName) transformDarwinUniversalBinary(ctx, fatOutputFile, outputFile, deps.DarwinSecondArchOutput.Path()) } builderFlags := flagsToBuilderFlags(flags) stripFlags := flagsToStripFlags(flags) if binary.stripper.NeedsStrip(ctx) { if ctx.Darwin() { stripFlags.StripUseGnuStrip = true } strippedOutputFile := outputFile outputFile = android.PathForModuleOut(ctx, "unstripped", fileName) binary.stripper.StripExecutableOrSharedLib(ctx, outputFile, strippedOutputFile, stripFlags) } binary.unstrippedOutputFile = outputFile if String(binary.Properties.Prefix_symbols) != "" { afterPrefixSymbols := outputFile outputFile = android.PathForModuleOut(ctx, "unprefixed", fileName) transformBinaryPrefixSymbols(ctx, String(binary.Properties.Prefix_symbols), outputFile, builderFlags, afterPrefixSymbols) } outputFile = maybeInjectBoringSSLHash(ctx, outputFile, binary.Properties.Inject_bssl_hash, fileName) // If use_version_lib is true, make an android::build::GetBuildNumber() function available. if Bool(binary.baseLinker.Properties.Use_version_lib) { if ctx.Host() { versionedOutputFile := outputFile outputFile = android.PathForModuleOut(ctx, "unversioned", fileName) binary.injectVersionSymbol(ctx, outputFile, versionedOutputFile) } else { // When dist'ing a library or binary that has use_version_lib set, always // distribute the stamped version, even for the device. versionedOutputFile := android.PathForModuleOut(ctx, "versioned", fileName) binary.distFiles = android.MakeDefaultDistFiles(versionedOutputFile) if binary.stripper.NeedsStrip(ctx) { out := android.PathForModuleOut(ctx, "versioned-stripped", fileName) binary.distFiles = android.MakeDefaultDistFiles(out) binary.stripper.StripExecutableOrSharedLib(ctx, versionedOutputFile, out, stripFlags) } binary.injectVersionSymbol(ctx, outputFile, versionedOutputFile) } } var validations android.Paths // Handle host bionic linker symbols. if ctx.Os() == android.LinuxBionic && !binary.static() { verifyFile := android.PathForModuleOut(ctx, "host_bionic_verify.stamp") if !deps.DynamicLinker.Valid() { panic("Non-static host bionic modules must have a dynamic linker") } binary.verifyHostBionicLinker(ctx, outputFile, deps.DynamicLinker.Path(), verifyFile) validations = append(validations, verifyFile) } var sharedLibs android.Paths // Ignore shared libs for static executables. if !binary.static() { sharedLibs = deps.EarlySharedLibs sharedLibs = append(sharedLibs, deps.SharedLibs...) sharedLibs = append(sharedLibs, deps.LateSharedLibs...) linkerDeps = append(linkerDeps, deps.EarlySharedLibsDeps...) linkerDeps = append(linkerDeps, deps.SharedLibsDeps...) linkerDeps = append(linkerDeps, deps.LateSharedLibsDeps...) linkerDeps = append(linkerDeps, ndkSharedLibDeps(ctx)...) } validations = append(validations, objs.tidyDepFiles...) linkerDeps = append(linkerDeps, flags.LdFlagsDeps...) // Register link action. transformObjToDynamicBinary(ctx, objs.objFiles, sharedLibs, deps.StaticLibs, deps.LateStaticLibs, deps.WholeStaticLibs, linkerDeps, deps.CrtBegin, deps.CrtEnd, true, builderFlags, outputFile, nil, validations) objs.coverageFiles = append(objs.coverageFiles, deps.StaticLibObjs.coverageFiles...) objs.coverageFiles = append(objs.coverageFiles, deps.WholeStaticLibObjs.coverageFiles...) binary.coverageOutputFile = transformCoverageFilesToZip(ctx, objs, binary.getStem(ctx)) // Need to determine symlinks early since some targets (ie APEX) need this // information but will not call 'install' binary.setSymlinkList(ctx) return ret } func (binary *binaryDecorator) unstrippedOutputFilePath() android.Path { return binary.unstrippedOutputFile } func (binary *binaryDecorator) setSymlinkList(ctx ModuleContext) { for _, symlink := range binary.Properties.Symlinks { binary.symlinks = append(binary.symlinks, symlink+String(binary.Properties.Suffix)+ctx.toolchain().ExecutableSuffix()) } if Bool(binary.Properties.Symlink_preferred_arch) { if String(binary.Properties.Suffix) == "" { ctx.PropertyErrorf("symlink_preferred_arch", "must also specify suffix") } if ctx.TargetPrimary() { // Install a symlink to the preferred architecture symlinkName := binary.getStemWithoutSuffix(ctx) binary.symlinks = append(binary.symlinks, symlinkName) binary.preferredArchSymlink = symlinkName } } } func (binary *binaryDecorator) symlinkList() []string { return binary.symlinks } func (binary *binaryDecorator) nativeCoverage() bool { return true } func (binary *binaryDecorator) coverageOutputFilePath() android.OptionalPath { return binary.coverageOutputFile } // /system/bin/linker -> /apex/com.android.runtime/bin/linker func (binary *binaryDecorator) installSymlinkToRuntimeApex(ctx ModuleContext, file android.Path) { dir := binary.baseInstaller.installDir(ctx) dirOnDevice := android.InstallPathToOnDevicePath(ctx, dir) target := "/" + filepath.Join("apex", "com.android.runtime", dir.Base(), file.Base()) ctx.InstallAbsoluteSymlink(dir, file.Base(), target) binary.postInstallCmds = append(binary.postInstallCmds, makeSymlinkCmd(dirOnDevice, file.Base(), target)) for _, symlink := range binary.symlinks { ctx.InstallAbsoluteSymlink(dir, symlink, target) binary.postInstallCmds = append(binary.postInstallCmds, makeSymlinkCmd(dirOnDevice, symlink, target)) } } func (binary *binaryDecorator) install(ctx ModuleContext, file android.Path) { // Bionic binaries (e.g. linker) is installed to the bootstrap subdirectory. // The original path becomes a symlink to the corresponding file in the // runtime APEX. translatedArch := ctx.Target().NativeBridge == android.NativeBridgeEnabled if InstallToBootstrap(ctx.baseModuleName(), ctx.Config()) && !ctx.Host() && ctx.directlyInAnyApex() && !translatedArch && ctx.apexVariationName() == "" && !ctx.inRamdisk() && !ctx.inRecovery() && !ctx.inVendorRamdisk() { if ctx.Device() && isBionic(ctx.baseModuleName()) { binary.installSymlinkToRuntimeApex(ctx, file) } binary.baseInstaller.subDir = "bootstrap" } binary.baseInstaller.installExecutable(ctx, file) var preferredArchSymlinkPath android.OptionalPath for _, symlink := range binary.symlinks { installedSymlink := ctx.InstallSymlink(binary.baseInstaller.installDir(ctx), symlink, binary.baseInstaller.path) if symlink == binary.preferredArchSymlink { // If this is the preferred arch symlink, save the installed path for use as the // tool path. preferredArchSymlinkPath = android.OptionalPathForPath(installedSymlink) } } if ctx.Os().Class == android.Host { // If the binary is multilib with a symlink to the preferred architecture, use the // symlink instead of the binary because that's the more "canonical" name. if preferredArchSymlinkPath.Valid() { binary.toolPath = preferredArchSymlinkPath } else { binary.toolPath = android.OptionalPathForPath(binary.baseInstaller.path) } } } func (binary *binaryDecorator) hostToolPath() android.OptionalPath { return binary.toolPath } func (binary *binaryDecorator) overriddenModules() []string { return binary.Properties.Overrides } var _ overridable = (*binaryDecorator)(nil) func init() { pctx.HostBinToolVariable("verifyHostBionicCmd", "host_bionic_verify") } var verifyHostBionic = pctx.AndroidStaticRule("verifyHostBionic", blueprint.RuleParams{ Command: "$verifyHostBionicCmd -i $in -l $linker && touch $out", CommandDeps: []string{"$verifyHostBionicCmd"}, }, "linker") func (binary *binaryDecorator) verifyHostBionicLinker(ctx ModuleContext, in, linker android.Path, out android.WritablePath) { ctx.Build(pctx, android.BuildParams{ Rule: verifyHostBionic, Description: "verify host bionic", Input: in, Implicit: linker, Output: out, Args: map[string]string{ "linker": linker.String(), }, }) } type ccBinaryBazelHandler struct { module *Module } var _ BazelHandler = (*ccBinaryBazelHandler)(nil) func (handler *ccBinaryBazelHandler) QueueBazelCall(ctx android.BaseModuleContext, label string) { bazelCtx := ctx.Config().BazelContext bazelCtx.QueueBazelRequest(label, cquery.GetCcUnstrippedInfo, android.GetConfigKeyApexVariant(ctx, GetApexConfigKey(ctx))) } func (handler *ccBinaryBazelHandler) ProcessBazelQueryResponse(ctx android.ModuleContext, label string) { bazelCtx := ctx.Config().BazelContext info, err := bazelCtx.GetCcUnstrippedInfo(label, android.GetConfigKeyApexVariant(ctx, GetApexConfigKey(ctx))) if err != nil { ctx.ModuleErrorf(err.Error()) return } var outputFilePath android.Path = android.PathForBazelOut(ctx, info.OutputFile) if len(info.TidyFiles) > 0 { handler.module.tidyFiles = android.PathsForBazelOut(ctx, info.TidyFiles) outputFilePath = android.AttachValidationActions(ctx, outputFilePath, handler.module.tidyFiles) } handler.module.outputFile = android.OptionalPathForPath(outputFilePath) handler.module.linker.(*binaryDecorator).unstrippedOutputFile = android.PathForBazelOut(ctx, info.UnstrippedOutput) handler.module.setAndroidMkVariablesFromCquery(info.CcAndroidMkInfo) } func binaryBp2buildAttrs(ctx android.TopDownMutatorContext, m *Module) binaryAttributes { baseAttrs := bp2BuildParseBaseProps(ctx, m) binaryLinkerAttrs := bp2buildBinaryLinkerProps(ctx, m) if proptools.BoolDefault(binaryLinkerAttrs.Linkshared, true) { baseAttrs.implementationDynamicDeps.Add(baseAttrs.protoDependency) } else { baseAttrs.implementationDeps.Add(baseAttrs.protoDependency) } attrs := binaryAttributes{ binaryLinkerAttrs: binaryLinkerAttrs, Srcs: baseAttrs.srcs, Srcs_c: baseAttrs.cSrcs, Srcs_as: baseAttrs.asSrcs, Copts: baseAttrs.copts, Cppflags: baseAttrs.cppFlags, Conlyflags: baseAttrs.conlyFlags, Asflags: baseAttrs.asFlags, Deps: baseAttrs.implementationDeps, Dynamic_deps: baseAttrs.implementationDynamicDeps, Whole_archive_deps: baseAttrs.wholeArchiveDeps, System_deps: baseAttrs.systemDynamicDeps, Runtime_deps: baseAttrs.runtimeDeps, Local_includes: baseAttrs.localIncludes, Absolute_includes: baseAttrs.absoluteIncludes, Linkopts: baseAttrs.linkopts, Use_version_lib: baseAttrs.useVersionLib, Rtti: baseAttrs.rtti, Stl: baseAttrs.stl, Cpp_std: baseAttrs.cppStd, Additional_linker_inputs: baseAttrs.additionalLinkerInputs, Strip: stripAttributes{ Keep_symbols: baseAttrs.stripKeepSymbols, Keep_symbols_and_debug_frame: baseAttrs.stripKeepSymbolsAndDebugFrame, Keep_symbols_list: baseAttrs.stripKeepSymbolsList, All: baseAttrs.stripAll, None: baseAttrs.stripNone, }, Features: baseAttrs.features, sdkAttributes: bp2BuildParseSdkAttributes(m), Native_coverage: baseAttrs.Native_coverage, } m.convertTidyAttributes(ctx, &attrs.tidyAttributes) return attrs } func binaryBp2build(ctx android.TopDownMutatorContext, m *Module) { // shared with cc_test binaryAttrs := binaryBp2buildAttrs(ctx, m) tags := android.ApexAvailableTagsWithoutTestApexes(ctx, m) ctx.CreateBazelTargetModule(bazel.BazelTargetModuleProperties{ Rule_class: "cc_binary", Bzl_load_location: "//build/bazel/rules/cc:cc_binary.bzl", }, android.CommonAttributes{Name: m.Name(), Tags: tags}, &binaryAttrs) } // binaryAttributes contains Bazel attributes corresponding to a cc binary type binaryAttributes struct { binaryLinkerAttrs Srcs bazel.LabelListAttribute Srcs_c bazel.LabelListAttribute Srcs_as bazel.LabelListAttribute Copts bazel.StringListAttribute Cppflags bazel.StringListAttribute Conlyflags bazel.StringListAttribute Asflags bazel.StringListAttribute Deps bazel.LabelListAttribute Dynamic_deps bazel.LabelListAttribute Whole_archive_deps bazel.LabelListAttribute System_deps bazel.LabelListAttribute Runtime_deps bazel.LabelListAttribute Local_includes bazel.StringListAttribute Absolute_includes bazel.StringListAttribute Linkopts bazel.StringListAttribute Additional_linker_inputs bazel.LabelListAttribute Use_version_lib bazel.BoolAttribute Rtti bazel.BoolAttribute Stl *string Cpp_std *string Strip stripAttributes Features bazel.StringListAttribute sdkAttributes tidyAttributes Native_coverage *bool }