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// Copyright 2015 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 genrule
import (
"path/filepath"
"github.com/google/blueprint"
"github.com/google/blueprint/pathtools"
"android/soong"
"android/soong/common"
)
func init() {
soong.RegisterModuleType("gensrcs", GenSrcsFactory)
soong.RegisterModuleType("genrule", GenRuleFactory)
}
var (
pctx = blueprint.NewPackageContext("android/soong/genrule")
)
func init() {
pctx.VariableConfigMethod("srcDir", common.Config.SrcDir)
pctx.VariableConfigMethod("hostBin", common.Config.HostBin)
}
type SourceFileGenerator interface {
GeneratedSourceFiles() []string
}
type HostToolProvider interface {
HostToolPath() string
}
type generatorProperties struct {
// command to run on one or more input files. Available variables for substitution:
// $in: one or more input files
// $out: a single output file
// $srcDir: the root directory of the source tree
// The host bin directory will be in the path
Cmd string
// name of the module (if any) that produces the host executable. Leave empty for
// prebuilts or scripts that do not need a module to build them.
Tool string
}
type generator struct {
common.AndroidModuleBase
properties generatorProperties
tasks taskFunc
deps []string
rule blueprint.Rule
outputFiles []string
}
type taskFunc func(ctx common.AndroidModuleContext) []generateTask
type generateTask struct {
in []string
out string
}
func (g *generator) GeneratedSourceFiles() []string {
return g.outputFiles
}
func (g *generator) AndroidDynamicDependencies(ctx common.AndroidDynamicDependerModuleContext) []string {
if g.properties.Tool != "" {
ctx.AddFarVariationDependencies([]blueprint.Variation{{"hostordevice", common.Host.String()}},
g.properties.Tool)
}
return nil
}
func (g *generator) GenerateAndroidBuildActions(ctx common.AndroidModuleContext) {
g.rule = ctx.Rule(pctx, "generator", blueprint.RuleParams{
Command: "PATH=$$PATH:$hostBin " + g.properties.Cmd,
})
ctx.VisitDirectDeps(func(module blueprint.Module) {
if t, ok := module.(HostToolProvider); ok {
p := t.HostToolPath()
if p != "" {
g.deps = append(g.deps, p)
} else {
ctx.ModuleErrorf("host tool %q missing output file", ctx.OtherModuleName(module))
}
} else {
ctx.ModuleErrorf("unknown dependency %q", ctx.OtherModuleName(module))
}
})
for _, task := range g.tasks(ctx) {
g.generateSourceFile(ctx, task)
}
}
func (g *generator) generateSourceFile(ctx common.AndroidModuleContext, task generateTask) {
ctx.Build(pctx, blueprint.BuildParams{
Rule: g.rule,
Inputs: task.in,
Implicits: g.deps,
Outputs: []string{task.out},
})
g.outputFiles = append(g.outputFiles, task.out)
}
func generatorFactory(tasks taskFunc, props ...interface{}) (blueprint.Module, []interface{}) {
module := &generator{
tasks: tasks,
}
props = append(props, &module.properties)
return common.InitAndroidModule(module, props...)
}
func GenSrcsFactory() (blueprint.Module, []interface{}) {
properties := &genSrcsProperties{}
tasks := func(ctx common.AndroidModuleContext) []generateTask {
srcFiles := ctx.ExpandSources(properties.Srcs, nil)
tasks := make([]generateTask, 0, len(srcFiles))
for _, in := range srcFiles {
out := pathtools.ReplaceExtension(in, properties.Output_extension)
out = filepath.Join(common.ModuleGenDir(ctx), out)
tasks = append(tasks, generateTask{[]string{in}, out})
}
return tasks
}
return generatorFactory(tasks, properties)
}
type genSrcsProperties struct {
// list of input files
Srcs []string
// extension that will be substituted for each output file
Output_extension string
}
func GenRuleFactory() (blueprint.Module, []interface{}) {
properties := &genRuleProperties{}
tasks := func(ctx common.AndroidModuleContext) []generateTask {
return []generateTask{
{
in: ctx.ExpandSources(properties.Srcs, nil),
out: filepath.Join(common.ModuleGenDir(ctx), properties.Out),
},
}
}
return generatorFactory(tasks, properties)
}
type genRuleProperties struct {
// list of input files
Srcs []string
// name of the output file that will be generated
Out string
}
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