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// 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 (
"fmt"
"android/soong/android"
"android/soong/bazel"
)
//
// Objects (for crt*.o)
//
func init() {
android.RegisterModuleType("cc_object", ObjectFactory)
android.RegisterSdkMemberType(ccObjectSdkMemberType)
}
var ccObjectSdkMemberType = &librarySdkMemberType{
SdkMemberTypeBase: android.SdkMemberTypeBase{
PropertyName: "native_objects",
SupportsSdk: true,
},
prebuiltModuleType: "cc_prebuilt_object",
linkTypes: nil,
}
type objectLinker struct {
*baseLinker
Properties ObjectLinkerProperties
}
type objectBazelHandler struct {
android.BazelHandler
module *Module
}
func (handler *objectBazelHandler) GenerateBazelBuildActions(ctx android.ModuleContext, label string) bool {
bazelCtx := ctx.Config().BazelContext
objPaths, ok := bazelCtx.GetOutputFiles(label, android.GetConfigKey(ctx))
if ok {
if len(objPaths) != 1 {
ctx.ModuleErrorf("expected exactly one object file for '%s', but got %s", label, objPaths)
return false
}
handler.module.outputFile = android.OptionalPathForPath(android.PathForBazelOut(ctx, objPaths[0]))
}
return ok
}
type ObjectLinkerProperties struct {
// list of static library modules that should only provide headers for this module.
Static_libs []string `android:"arch_variant,variant_prepend"`
// list of shared library modules should only provide headers for this module.
Shared_libs []string `android:"arch_variant"`
// list of modules that should only provide headers for this module.
Header_libs []string `android:"arch_variant,variant_prepend"`
// list of default libraries that will provide headers for this module. If unset, generally
// defaults to libc, libm, and libdl. Set to [] to prevent using headers from the defaults.
System_shared_libs []string `android:"arch_variant"`
// names of other cc_object modules to link into this module using partial linking
Objs []string `android:"arch_variant"`
// if set, add an extra objcopy --prefix-symbols= step
Prefix_symbols *string
// if set, the path to a linker script to pass to ld -r when combining multiple object files.
Linker_script *string `android:"path,arch_variant"`
// Indicates that this module is a CRT object. CRT objects will be split
// into a variant per-API level between min_sdk_version and current.
Crt *bool
}
func newObject(hod android.HostOrDeviceSupported) *Module {
module := newBaseModule(hod, android.MultilibBoth)
module.sanitize = &sanitize{}
module.stl = &stl{}
return module
}
// cc_object runs the compiler without running the linker. It is rarely
// necessary, but sometimes used to generate .s files from .c files to use as
// input to a cc_genrule module.
func ObjectFactory() android.Module {
module := newObject(android.HostAndDeviceSupported)
module.linker = &objectLinker{
baseLinker: NewBaseLinker(module.sanitize),
}
module.compiler = NewBaseCompiler()
module.bazelHandler = &objectBazelHandler{module: module}
// Clang's address-significance tables are incompatible with ld -r.
module.compiler.appendCflags([]string{"-fno-addrsig"})
module.sdkMemberTypes = []android.SdkMemberType{ccObjectSdkMemberType}
module.bazelable = true
return module.Init()
}
// For bp2build conversion.
type bazelObjectAttributes struct {
Srcs bazel.LabelListAttribute
Srcs_as bazel.LabelListAttribute
Hdrs bazel.LabelListAttribute
Deps bazel.LabelListAttribute
System_dynamic_deps bazel.LabelListAttribute
Copts bazel.StringListAttribute
Asflags bazel.StringListAttribute
Local_includes bazel.StringListAttribute
Absolute_includes bazel.StringListAttribute
Stl *string
Linker_script bazel.LabelAttribute
sdkAttributes
}
// objectBp2Build is the bp2build converter from cc_object modules to the
// Bazel equivalent target, plus any necessary include deps for the cc_object.
func objectBp2Build(ctx android.TopDownMutatorContext, m *Module) {
if m.compiler == nil {
// a cc_object must have access to the compiler decorator for its props.
ctx.ModuleErrorf("compiler must not be nil for a cc_object module")
}
// Set arch-specific configurable attributes
baseAttributes := bp2BuildParseBaseProps(ctx, m)
compilerAttrs := baseAttributes.compilerAttributes
var deps bazel.LabelListAttribute
systemDynamicDeps := bazel.LabelListAttribute{ForceSpecifyEmptyList: true}
var linkerScript bazel.LabelAttribute
for axis, configToProps := range m.GetArchVariantProperties(ctx, &ObjectLinkerProperties{}) {
for config, props := range configToProps {
if objectLinkerProps, ok := props.(*ObjectLinkerProperties); ok {
if objectLinkerProps.Linker_script != nil {
label := android.BazelLabelForModuleSrcSingle(ctx, *objectLinkerProps.Linker_script)
linkerScript.SetSelectValue(axis, config, label)
}
deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Objs))
systemSharedLibs := objectLinkerProps.System_shared_libs
if len(systemSharedLibs) > 0 {
systemSharedLibs = android.FirstUniqueStrings(systemSharedLibs)
}
systemDynamicDeps.SetSelectValue(axis, config, bazelLabelForSharedDeps(ctx, systemSharedLibs))
}
}
}
deps.ResolveExcludes()
// Don't split cc_object srcs across languages. Doing so would add complexity,
// and this isn't typically done for cc_object.
srcs := compilerAttrs.srcs
srcs.Append(compilerAttrs.cSrcs)
asFlags := compilerAttrs.asFlags
if compilerAttrs.asSrcs.IsEmpty() {
// Skip asflags for BUILD file simplicity if there are no assembly sources.
asFlags = bazel.MakeStringListAttribute(nil)
}
attrs := &bazelObjectAttributes{
Srcs: srcs,
Srcs_as: compilerAttrs.asSrcs,
Deps: deps,
System_dynamic_deps: systemDynamicDeps,
Copts: compilerAttrs.copts,
Asflags: asFlags,
Local_includes: compilerAttrs.localIncludes,
Absolute_includes: compilerAttrs.absoluteIncludes,
Stl: compilerAttrs.stl,
Linker_script: linkerScript,
sdkAttributes: bp2BuildParseSdkAttributes(m),
}
props := bazel.BazelTargetModuleProperties{
Rule_class: "cc_object",
Bzl_load_location: "//build/bazel/rules/cc:cc_object.bzl",
}
ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: m.Name()}, attrs)
}
func (object *objectLinker) appendLdflags(flags []string) {
panic(fmt.Errorf("appendLdflags on objectLinker not supported"))
}
func (object *objectLinker) linkerProps() []interface{} {
return []interface{}{&object.Properties}
}
func (*objectLinker) linkerInit(ctx BaseModuleContext) {}
func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
deps.HeaderLibs = append(deps.HeaderLibs, object.Properties.Header_libs...)
deps.SharedLibs = append(deps.SharedLibs, object.Properties.Shared_libs...)
deps.StaticLibs = append(deps.StaticLibs, object.Properties.Static_libs...)
deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)
deps.SystemSharedLibs = object.Properties.System_shared_libs
if deps.SystemSharedLibs == nil {
// Provide a default set of shared libraries if system_shared_libs is unspecified.
// Note: If an empty list [] is specified, it implies that the module declines the
// default shared libraries.
deps.SystemSharedLibs = append(deps.SystemSharedLibs, ctx.toolchain().DefaultSharedLibraries()...)
}
deps.LateSharedLibs = append(deps.LateSharedLibs, deps.SystemSharedLibs...)
return deps
}
func (object *objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
flags.Global.LdFlags = append(flags.Global.LdFlags, ctx.toolchain().ToolchainLdflags())
if lds := android.OptionalPathForModuleSrc(ctx, object.Properties.Linker_script); lds.Valid() {
flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-T,"+lds.String())
flags.LdFlagsDeps = append(flags.LdFlagsDeps, lds.Path())
}
return flags
}
func (object *objectLinker) link(ctx ModuleContext,
flags Flags, deps PathDeps, objs Objects) android.Path {
objs = objs.Append(deps.Objs)
var outputFile android.Path
builderFlags := flagsToBuilderFlags(flags)
if len(objs.objFiles) == 1 && String(object.Properties.Linker_script) == "" {
outputFile = objs.objFiles[0]
if String(object.Properties.Prefix_symbols) != "" {
output := android.PathForModuleOut(ctx, ctx.ModuleName()+objectExtension)
transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), outputFile,
builderFlags, output)
outputFile = output
}
} else {
output := android.PathForModuleOut(ctx, ctx.ModuleName()+objectExtension)
outputFile = output
if String(object.Properties.Prefix_symbols) != "" {
input := android.PathForModuleOut(ctx, "unprefixed", ctx.ModuleName()+objectExtension)
transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), input,
builderFlags, output)
output = input
}
transformObjsToObj(ctx, objs.objFiles, builderFlags, output, flags.LdFlagsDeps)
}
ctx.CheckbuildFile(outputFile)
return outputFile
}
func (object *objectLinker) linkerSpecifiedDeps(specifiedDeps specifiedDeps) specifiedDeps {
specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, object.Properties.Shared_libs...)
// Must distinguish nil and [] in system_shared_libs - ensure that [] in
// either input list doesn't come out as nil.
if specifiedDeps.systemSharedLibs == nil {
specifiedDeps.systemSharedLibs = object.Properties.System_shared_libs
} else {
specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, object.Properties.System_shared_libs...)
}
return specifiedDeps
}
func (object *objectLinker) unstrippedOutputFilePath() android.Path {
return nil
}
func (object *objectLinker) nativeCoverage() bool {
return true
}
func (object *objectLinker) coverageOutputFilePath() android.OptionalPath {
return android.OptionalPath{}
}
func (object *objectLinker) object() bool {
return true
}
func (object *objectLinker) isCrt() bool {
return Bool(object.Properties.Crt)
}