| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * 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 androidx.compose |
| |
| internal val keyInfo = mutableMapOf<Int, String>() |
| |
| private fun findSourceKey(key: Any): Int? = |
| when (key) { |
| is Int -> key |
| is JoinedKey -> { |
| key.left?.let { findSourceKey(it) } ?: key.right?.let { findSourceKey(it) } |
| } |
| else -> null |
| } |
| |
| internal actual fun recordSourceKeyInfo(key: Any) { |
| val sk = findSourceKey(key) |
| sk?.let { |
| keyInfo.getOrPut(sk, { |
| val stack = Thread.currentThread().stackTrace |
| // On Android the frames looks like: |
| // 0: getThreadStackTrace() (native method) |
| // 1: getStackTrace() |
| // 2: recordSourceKeyInfo() |
| // 3: start() |
| // 4: start() |
| // 5: startRestartGroup() or startReplaceableGroup() or startNode() or startDefaults() |
| // 6: <calling method> |
| // On a desktop VM this looks like: |
| // 0: getStackTrace() |
| // 1: recordSourceKey() |
| // 2: start() |
| // 3: startRestartGroup() or startReplaceableGroup() or startNode() or startDefaults() |
| // 4: non-inline call/emit? |
| // 4 or 5: <calling method> |
| val frame = stack |
| .drop(3) // The first 3 elements are never interesting to us |
| .dropWhile { it.className.startsWith("androidx.compose.Composer") } // Drop all |
| // start* |
| .drop(1) // Drop non-inline call/emit |
| .dropWhile { it.lineNumber == -1 } // Drop if we do not have source info |
| .first() |
| "${frame.className}.${frame.methodName} (${frame.fileName}:${frame.lineNumber})" |
| }) |
| } |
| } |
| |
| @InternalComposeApi |
| actual fun keySourceInfoOf(key: Any): String? = keyInfo[key] |
| |
| @InternalComposeApi |
| actual fun resetSourceInfo() { keyInfo.clear() } |