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// Copyright 2019 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 android
import (
"fmt"
"reflect"
"github.com/google/blueprint/proptools"
)
func registerPathDepsMutator(ctx RegisterMutatorsContext) {
ctx.BottomUp("pathdeps", pathDepsMutator).Parallel()
}
// The pathDepsMutator automatically adds dependencies on any module that is listed with ":module" syntax in a
// property that is tagged with android:"path".
func pathDepsMutator(ctx BottomUpMutatorContext) {
m := ctx.Module().(Module)
if m == nil {
return
}
props := m.base().generalProperties
var pathProperties []string
for _, ps := range props {
pathProperties = append(pathProperties, pathPropertiesForPropertyStruct(ctx, ps)...)
}
pathProperties = FirstUniqueStrings(pathProperties)
for _, s := range pathProperties {
if m, t := SrcIsModuleWithTag(s); m != "" {
ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
}
}
}
// pathPropertiesForPropertyStruct uses the indexes of properties that are tagged with android:"path" to extract
// all their values from a property struct, returning them as a single slice of strings..
func pathPropertiesForPropertyStruct(ctx BottomUpMutatorContext, ps interface{}) []string {
v := reflect.ValueOf(ps)
if v.Kind() != reflect.Ptr || v.Elem().Kind() != reflect.Struct {
panic(fmt.Errorf("type %s is not a pointer to a struct", v.Type()))
}
if v.IsNil() {
return nil
}
v = v.Elem()
pathPropertyIndexes := pathPropertyIndexesForPropertyStruct(ps)
var ret []string
for _, i := range pathPropertyIndexes {
sv := fieldByIndex(v, i)
if !sv.IsValid() {
continue
}
if sv.Kind() == reflect.Ptr {
if sv.IsNil() {
continue
}
sv = sv.Elem()
}
switch sv.Kind() {
case reflect.String:
ret = append(ret, sv.String())
case reflect.Slice:
ret = append(ret, sv.Interface().([]string)...)
default:
panic(fmt.Errorf(`field %s in type %s has tag android:"path" but is not a string or slice of strings, it is a %s`,
v.Type().FieldByIndex(i).Name, v.Type(), sv.Type()))
}
}
return ret
}
// fieldByIndex is like reflect.Value.FieldByIndex, but returns an invalid reflect.Value when traversing a nil pointer
// to a struct.
func fieldByIndex(v reflect.Value, index []int) reflect.Value {
if len(index) == 1 {
return v.Field(index[0])
}
for _, x := range index {
if v.Kind() == reflect.Ptr {
if v.IsNil() {
return reflect.Value{}
}
v = v.Elem()
}
v = v.Field(x)
}
return v
}
var pathPropertyIndexesCache OncePer
// pathPropertyIndexesForPropertyStruct returns a list of all of the indexes of properties in property struct type that
// are tagged with android:"path". Each index is a []int suitable for passing to reflect.Value.FieldByIndex. The value
// is cached in a global cache by type.
func pathPropertyIndexesForPropertyStruct(ps interface{}) [][]int {
key := NewCustomOnceKey(reflect.TypeOf(ps))
return pathPropertyIndexesCache.Once(key, func() interface{} {
return proptools.PropertyIndexesWithTag(ps, "android", "path")
}).([][]int)
}
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