StartupProfiles.kt
/*
* Copyright 2022 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.
*/
@file:RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
package androidx.benchmark.macro
import androidx.annotation.RestrictTo
private val PROFILE_RULE_REGEX = "(H?S?P?)L([^$;]*)(.*)".toRegex()
/**
* Builds a startup profile for a given baseline profile.
*
* This startup profile can be used for dex layout optimizations.
*/
fun startupProfile(profile: String, includeStartupOnly: Boolean = false): String {
val rules = profile.lines().mapNotNull { rule ->
when (val result = PROFILE_RULE_REGEX.find(rule)) {
null -> null
else -> {
val (flags, classPrefix, _) = result.destructured
// Empty flags are indicative that the class needs to be aggressively preloaded
// Therefore the class belongs in the primary dex.
val isStartup = flags.isEmpty() || flags.contains("S")
if (includeStartupOnly && !isStartup) {
null
} else {
"SL$classPrefix;"
}
}
}
}
val ruleSet = mutableSetOf<String>()
val startupRules = mutableListOf<String>()
// Try and keep the same order
rules.forEach { rule ->
if (!ruleSet.contains(rule)) {
ruleSet += rule
startupRules += rule
}
}
return startupRules.joinToString(separator = "\n")
}