308 lines
10 KiB
Go
308 lines
10 KiB
Go
// Copyright 2016 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cc
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import (
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"fmt"
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"android/soong/android"
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"android/soong/bazel"
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)
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//
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// Objects (for crt*.o)
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//
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func init() {
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android.RegisterModuleType("cc_object", ObjectFactory)
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android.RegisterSdkMemberType(ccObjectSdkMemberType)
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}
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var ccObjectSdkMemberType = &librarySdkMemberType{
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SdkMemberTypeBase: android.SdkMemberTypeBase{
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PropertyName: "native_objects",
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SupportsSdk: true,
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},
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prebuiltModuleType: "cc_prebuilt_object",
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linkTypes: nil,
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}
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type objectLinker struct {
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*baseLinker
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Properties ObjectLinkerProperties
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}
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type objectBazelHandler struct {
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android.BazelHandler
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module *Module
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}
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func (handler *objectBazelHandler) GenerateBazelBuildActions(ctx android.ModuleContext, label string) bool {
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bazelCtx := ctx.Config().BazelContext
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objPaths, ok := bazelCtx.GetOutputFiles(label, android.GetConfigKey(ctx))
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if ok {
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if len(objPaths) != 1 {
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ctx.ModuleErrorf("expected exactly one object file for '%s', but got %s", label, objPaths)
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return false
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}
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handler.module.outputFile = android.OptionalPathForPath(android.PathForBazelOut(ctx, objPaths[0]))
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}
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return ok
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}
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type ObjectLinkerProperties struct {
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// list of static library modules that should only provide headers for this module.
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Static_libs []string `android:"arch_variant,variant_prepend"`
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// list of shared library modules should only provide headers for this module.
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Shared_libs []string `android:"arch_variant"`
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// list of modules that should only provide headers for this module.
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Header_libs []string `android:"arch_variant,variant_prepend"`
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// list of default libraries that will provide headers for this module. If unset, generally
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// defaults to libc, libm, and libdl. Set to [] to prevent using headers from the defaults.
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System_shared_libs []string `android:"arch_variant"`
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// names of other cc_object modules to link into this module using partial linking
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Objs []string `android:"arch_variant"`
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// if set, add an extra objcopy --prefix-symbols= step
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Prefix_symbols *string
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// if set, the path to a linker script to pass to ld -r when combining multiple object files.
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Linker_script *string `android:"path,arch_variant"`
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// Indicates that this module is a CRT object. CRT objects will be split
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// into a variant per-API level between min_sdk_version and current.
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Crt *bool
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}
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func newObject(hod android.HostOrDeviceSupported) *Module {
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module := newBaseModule(hod, android.MultilibBoth)
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module.sanitize = &sanitize{}
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module.stl = &stl{}
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return module
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}
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// cc_object runs the compiler without running the linker. It is rarely
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// necessary, but sometimes used to generate .s files from .c files to use as
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// input to a cc_genrule module.
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func ObjectFactory() android.Module {
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module := newObject(android.HostAndDeviceSupported)
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module.linker = &objectLinker{
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baseLinker: NewBaseLinker(module.sanitize),
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}
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module.compiler = NewBaseCompiler()
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module.bazelHandler = &objectBazelHandler{module: module}
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// Clang's address-significance tables are incompatible with ld -r.
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module.compiler.appendCflags([]string{"-fno-addrsig"})
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module.sdkMemberTypes = []android.SdkMemberType{ccObjectSdkMemberType}
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module.bazelable = true
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return module.Init()
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}
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// For bp2build conversion.
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type bazelObjectAttributes struct {
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Srcs bazel.LabelListAttribute
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Srcs_as bazel.LabelListAttribute
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Hdrs bazel.LabelListAttribute
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Deps bazel.LabelListAttribute
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System_dynamic_deps bazel.LabelListAttribute
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Copts bazel.StringListAttribute
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Asflags bazel.StringListAttribute
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Local_includes bazel.StringListAttribute
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Absolute_includes bazel.StringListAttribute
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Stl *string
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Linker_script bazel.LabelAttribute
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}
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// objectBp2Build is the bp2build converter from cc_object modules to the
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// Bazel equivalent target, plus any necessary include deps for the cc_object.
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func objectBp2Build(ctx android.TopDownMutatorContext, m *Module) {
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if m.compiler == nil {
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// a cc_object must have access to the compiler decorator for its props.
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ctx.ModuleErrorf("compiler must not be nil for a cc_object module")
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}
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// Set arch-specific configurable attributes
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baseAttributes := bp2BuildParseBaseProps(ctx, m)
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compilerAttrs := baseAttributes.compilerAttributes
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var deps bazel.LabelListAttribute
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systemDynamicDeps := bazel.LabelListAttribute{ForceSpecifyEmptyList: true}
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var linkerScript bazel.LabelAttribute
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for axis, configToProps := range m.GetArchVariantProperties(ctx, &ObjectLinkerProperties{}) {
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for config, props := range configToProps {
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if objectLinkerProps, ok := props.(*ObjectLinkerProperties); ok {
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if objectLinkerProps.Linker_script != nil {
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label := android.BazelLabelForModuleSrcSingle(ctx, *objectLinkerProps.Linker_script)
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linkerScript.SetSelectValue(axis, config, label)
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}
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deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Objs))
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systemSharedLibs := objectLinkerProps.System_shared_libs
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if len(systemSharedLibs) > 0 {
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systemSharedLibs = android.FirstUniqueStrings(systemSharedLibs)
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}
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systemDynamicDeps.SetSelectValue(axis, config, bazelLabelForSharedDeps(ctx, systemSharedLibs))
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}
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}
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}
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deps.ResolveExcludes()
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// Don't split cc_object srcs across languages. Doing so would add complexity,
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// and this isn't typically done for cc_object.
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srcs := compilerAttrs.srcs
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srcs.Append(compilerAttrs.cSrcs)
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asFlags := compilerAttrs.asFlags
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if compilerAttrs.asSrcs.IsEmpty() {
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// Skip asflags for BUILD file simplicity if there are no assembly sources.
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asFlags = bazel.MakeStringListAttribute(nil)
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}
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attrs := &bazelObjectAttributes{
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Srcs: srcs,
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Srcs_as: compilerAttrs.asSrcs,
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Deps: deps,
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System_dynamic_deps: systemDynamicDeps,
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Copts: compilerAttrs.copts,
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Asflags: asFlags,
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Local_includes: compilerAttrs.localIncludes,
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Absolute_includes: compilerAttrs.absoluteIncludes,
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Stl: compilerAttrs.stl,
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Linker_script: linkerScript,
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}
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props := bazel.BazelTargetModuleProperties{
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Rule_class: "cc_object",
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Bzl_load_location: "//build/bazel/rules/cc:cc_object.bzl",
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}
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ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: m.Name()}, attrs)
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}
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func (object *objectLinker) appendLdflags(flags []string) {
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panic(fmt.Errorf("appendLdflags on objectLinker not supported"))
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}
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func (object *objectLinker) linkerProps() []interface{} {
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return []interface{}{&object.Properties}
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}
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func (*objectLinker) linkerInit(ctx BaseModuleContext) {}
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func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
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deps.HeaderLibs = append(deps.HeaderLibs, object.Properties.Header_libs...)
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deps.SharedLibs = append(deps.SharedLibs, object.Properties.Shared_libs...)
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deps.StaticLibs = append(deps.StaticLibs, object.Properties.Static_libs...)
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deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)
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deps.SystemSharedLibs = object.Properties.System_shared_libs
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if deps.SystemSharedLibs == nil {
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// Provide a default set of shared libraries if system_shared_libs is unspecified.
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// Note: If an empty list [] is specified, it implies that the module declines the
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// default shared libraries.
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deps.SystemSharedLibs = append(deps.SystemSharedLibs, ctx.toolchain().DefaultSharedLibraries()...)
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}
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deps.LateSharedLibs = append(deps.LateSharedLibs, deps.SystemSharedLibs...)
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return deps
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}
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func (object *objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
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flags.Global.LdFlags = append(flags.Global.LdFlags, ctx.toolchain().ToolchainLdflags())
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if lds := android.OptionalPathForModuleSrc(ctx, object.Properties.Linker_script); lds.Valid() {
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flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-T,"+lds.String())
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flags.LdFlagsDeps = append(flags.LdFlagsDeps, lds.Path())
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}
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return flags
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}
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func (object *objectLinker) link(ctx ModuleContext,
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flags Flags, deps PathDeps, objs Objects) android.Path {
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objs = objs.Append(deps.Objs)
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var outputFile android.Path
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builderFlags := flagsToBuilderFlags(flags)
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if len(objs.objFiles) == 1 && String(object.Properties.Linker_script) == "" {
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outputFile = objs.objFiles[0]
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if String(object.Properties.Prefix_symbols) != "" {
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output := android.PathForModuleOut(ctx, ctx.ModuleName()+objectExtension)
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transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), outputFile,
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builderFlags, output)
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outputFile = output
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}
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} else {
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output := android.PathForModuleOut(ctx, ctx.ModuleName()+objectExtension)
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outputFile = output
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if String(object.Properties.Prefix_symbols) != "" {
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input := android.PathForModuleOut(ctx, "unprefixed", ctx.ModuleName()+objectExtension)
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transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), input,
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builderFlags, output)
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output = input
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}
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transformObjsToObj(ctx, objs.objFiles, builderFlags, output, flags.LdFlagsDeps)
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}
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ctx.CheckbuildFile(outputFile)
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return outputFile
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}
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func (object *objectLinker) linkerSpecifiedDeps(specifiedDeps specifiedDeps) specifiedDeps {
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specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, object.Properties.Shared_libs...)
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// Must distinguish nil and [] in system_shared_libs - ensure that [] in
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// either input list doesn't come out as nil.
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if specifiedDeps.systemSharedLibs == nil {
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specifiedDeps.systemSharedLibs = object.Properties.System_shared_libs
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} else {
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specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, object.Properties.System_shared_libs...)
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}
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return specifiedDeps
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}
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func (object *objectLinker) unstrippedOutputFilePath() android.Path {
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return nil
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}
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func (object *objectLinker) nativeCoverage() bool {
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return true
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}
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func (object *objectLinker) coverageOutputFilePath() android.OptionalPath {
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return android.OptionalPath{}
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}
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func (object *objectLinker) object() bool {
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return true
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}
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func (object *objectLinker) isCrt() bool {
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return Bool(object.Properties.Crt)
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}
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