main.shark.AndroidResourceIdNames.kt Maven / Gradle / Ivy
package shark
import shark.HprofRecord.HeapDumpRecord.ObjectRecord.PrimitiveArrayDumpRecord.IntArrayDump
class AndroidResourceIdNames private constructor(
private val resourceIds: IntArray,
private val names: Array
) {
operator fun get(id: Int): String? {
val indexOfId = resourceIds.binarySearch(id)
return if (indexOfId >= 0) {
names[indexOfId]
} else {
null
}
}
companion object {
internal const val FIRST_APP_RESOURCE_ID = 0x7F010000
internal const val RESOURCE_ID_TYPE_ITERATOR = 0x00010000
@Volatile
@JvmStatic
private var holderField: AndroidResourceIdNames? = null
/**
* @param getResourceTypeName a function that delegates to Android
* Resources.getResourceTypeName but returns null when the name isn't found instead of
* throwing an exception.
*
* @param getResourceEntryName a function that delegates to Android
* Resources.getResourceEntryName but returns null when the name isn't found instead of
* throwing an exception.
*/
@Synchronized fun saveToMemory(
getResourceTypeName: (Int) -> String?,
getResourceEntryName: (Int) -> String?
) {
if (holderField != null) {
return
}
// This is based on https://jebware.com/blog/?p=600 which itself is based on
// https://stackoverflow.com/a/6646113/703646
val idToNamePairs = mutableListOf>()
findIdTypeResourceIdStart(getResourceTypeName)?.let { idTypeResourceIdStart ->
var resourceId = idTypeResourceIdStart
while (true) {
val entry = getResourceEntryName(resourceId) ?: break
idToNamePairs += resourceId to entry
resourceId++
}
}
val resourceIds = idToNamePairs.map { it.first }
.toIntArray()
val names = idToNamePairs.map { it.second }
.toTypedArray()
holderField = AndroidResourceIdNames(resourceIds, names)
}
private fun findIdTypeResourceIdStart(getResourceTypeName: (Int) -> String?): Int? {
var resourceTypeId = FIRST_APP_RESOURCE_ID
while (true) {
when (getResourceTypeName(resourceTypeId)) {
null -> return null
"id" -> return resourceTypeId
else -> resourceTypeId += RESOURCE_ID_TYPE_ITERATOR
}
}
}
fun readFromHeap(graph: HeapGraph): AndroidResourceIdNames? {
return graph.context.getOrPut(AndroidResourceIdNames::class.java.name) {
val className = AndroidResourceIdNames::class.java.name
val holderClass = graph.findClassByName(className)
holderClass?.let {
val holderField = holderClass["holderField"]!!
holderField.valueAsInstance?.let { instance ->
val resourceIdsField = instance[className, "resourceIds"]!!
val resourceIdsArray = resourceIdsField.valueAsPrimitiveArray!!
val resourceIds =
(resourceIdsArray.readRecord() as IntArrayDump).array
val names = instance[className, "names"]!!.valueAsObjectArray!!.readElements()
.map { it.readAsJavaString()!! }
.toList()
.toTypedArray()
AndroidResourceIdNames(resourceIds, names)
}
}
}
}
internal fun resetForTests() {
holderField = null
}
}
}