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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 (
"github.com/google/blueprint"
"github.com/google/blueprint/proptools"
"android/soong/android"
)
func init() {
pctx.HostBinToolVariable("protocCmd", "aprotoc")
}
var (
proto = pctx.AndroidStaticRule("protoc",
blueprint.RuleParams{
Command: "$protocCmd --cpp_out=$outDir $protoFlags $in",
CommandDeps: []string{"$protocCmd"},
}, "protoFlags", "outDir")
)
// TODO(ccross): protos are often used to communicate between multiple modules. If the only
// way to convert a proto to source is to reference it as a source file, and external modules cannot
// reference source files in other modules, then every module that owns a proto file will need to
// export a library for every type of external user (lite vs. full, c vs. c++ vs. java). It would
// be better to support a proto module type that exported a proto file along with some include dirs,
// and then external modules could depend on the proto module but use their own settings to
// generate the source.
func genProto(ctx android.ModuleContext, protoFile android.Path,
protoFlags string) (android.ModuleGenPath, android.ModuleGenPath) {
outFile := android.GenPathWithExt(ctx, "proto", protoFile, "pb.cc")
headerFile := android.GenPathWithExt(ctx, "proto", protoFile, "pb.h")
ctx.ModuleBuild(pctx, android.ModuleBuildParams{
Rule: proto,
Description: "protoc " + protoFile.Rel(),
Outputs: android.WritablePaths{outFile, headerFile},
Input: protoFile,
Args: map[string]string{
"outDir": protoDir(ctx).String(),
"protoFlags": protoFlags,
},
})
return outFile, headerFile
}
// protoDir returns the module's "gen/proto" directory
func protoDir(ctx android.ModuleContext) android.ModuleGenPath {
return android.PathForModuleGen(ctx, "proto")
}
// protoSubDir returns the module's "gen/proto/path/to/module" directory
func protoSubDir(ctx android.ModuleContext) android.ModuleGenPath {
return android.PathForModuleGen(ctx, "proto", ctx.ModuleDir())
}
type ProtoProperties struct {
Proto struct {
// Proto generator type (full, lite)
Type *string `android:"arch_variant"`
// Link statically against the protobuf runtime
Static bool `android:"arch_variant"`
// list of directories that will be added to the protoc include paths.
Include_dirs []string
// list of directories relative to the Android.bp file that will
// be added to the protoc include paths.
Local_include_dirs []string
} `android:"arch_variant"`
}
func protoDeps(ctx BaseModuleContext, deps Deps, p *ProtoProperties) Deps {
var lib string
var static bool
switch proptools.String(p.Proto.Type) {
case "full":
if ctx.sdk() {
lib = "libprotobuf-cpp-full-ndk"
static = true
} else {
lib = "libprotobuf-cpp-full"
}
case "lite", "":
if ctx.sdk() {
lib = "libprotobuf-cpp-lite-ndk"
static = true
} else {
lib = "libprotobuf-cpp-lite"
if p.Proto.Static {
static = true
}
}
default:
ctx.PropertyErrorf("proto.type", "unknown proto type %q",
proptools.String(p.Proto.Type))
}
if static {
deps.StaticLibs = append(deps.StaticLibs, lib)
deps.ReexportStaticLibHeaders = append(deps.ReexportStaticLibHeaders, lib)
} else {
deps.SharedLibs = append(deps.SharedLibs, lib)
deps.ReexportSharedLibHeaders = append(deps.ReexportSharedLibHeaders, lib)
}
return deps
}
func protoFlags(ctx ModuleContext, flags Flags, p *ProtoProperties) Flags {
flags.CFlags = append(flags.CFlags, "-DGOOGLE_PROTOBUF_NO_RTTI")
flags.GlobalFlags = append(flags.GlobalFlags,
"-I"+protoSubDir(ctx).String(),
"-I"+protoDir(ctx).String(),
)
if len(p.Proto.Local_include_dirs) > 0 {
localProtoIncludeDirs := android.PathsForModuleSrc(ctx, p.Proto.Local_include_dirs)
flags.protoFlags = append(flags.protoFlags, includeDirsToFlags(localProtoIncludeDirs))
}
if len(p.Proto.Include_dirs) > 0 {
rootProtoIncludeDirs := android.PathsForSource(ctx, p.Proto.Include_dirs)
flags.protoFlags = append(flags.protoFlags, includeDirsToFlags(rootProtoIncludeDirs))
}
flags.protoFlags = append(flags.protoFlags, "-I .")
return flags
}
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