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Scala 2 forwardport:
-Yprofile-trace (scala#19897)
* Scala 2 tracing profiler backport from scala/scala#7364 extended with more Scala 3 idiomatic syntax based on inlined methods * Fixes the `context.profiler` which could have been `null`, now it's initially a NoOp Profiler * Check dependencies of `-Yprofile-enabled` dependent tasks, now we get an error if `-Yprofile-trace` is set without `-Yprofile-enabled`
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190
compiler/src/dotty/tools/dotc/profile/ChromeTrace.scala
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| Original file line number | Diff line number | Diff line change |
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| // Scala 2 compiler backport of https://github.com/scala/scala/pull/7364 | ||
| /* | ||
| * Scala (https://www.scala-lang.org) | ||
| * | ||
| * Copyright EPFL and Lightbend, Inc. | ||
| * | ||
| * Licensed under Apache License 2.0 | ||
| * (http://www.apache.org/licenses/LICENSE-2.0). | ||
| * | ||
| * See the NOTICE file distributed with this work for | ||
| * additional information regarding copyright ownership. | ||
| */ | ||
|
|
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| package dotty.tools.dotc.profile | ||
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| import scala.language.unsafeNulls | ||
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| import java.io.Closeable | ||
| import java.lang.management.ManagementFactory | ||
| import java.nio.file.{Files, Path} | ||
| import java.util | ||
| import java.util.concurrent.TimeUnit | ||
|
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| import scala.collection.mutable | ||
|
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| object ChromeTrace { | ||
| private object EventType { | ||
| final val Start = "B" | ||
| final val Instant = "I" | ||
| final val End = "E" | ||
| final val Complete = "X" | ||
|
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| final val Counter = "C" | ||
|
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| final val AsyncStart = "b" | ||
| final val AsyncInstant = "n" | ||
| final val AsyncEnd = "e" | ||
| } | ||
| } | ||
|
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| /** Allows writing a subset of captrue traces based on https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview# | ||
| * Can be visualized using https://ui.perfetto.dev/, Chrome's about://tracing (outdated) or the tooling in https://www.google.com.au/search?q=catapult+tracing&oq=catapult+tracing+&aqs=chrome..69i57.3974j0j4&sourceid=chrome&ie=UTF-8 */ | ||
| final class ChromeTrace(f: Path) extends Closeable { | ||
| import ChromeTrace.EventType | ||
| private val traceWriter = FileUtils.newAsyncBufferedWriter(f) | ||
| private val context = mutable.Stack[JsonContext](TopContext) | ||
| private val tidCache = new ThreadLocal[String]() { | ||
| override def initialValue(): String = "%05d".format(Thread.currentThread().getId()) | ||
| } | ||
| objStart() | ||
| fld("traceEvents") | ||
| context.push(ValueContext) | ||
| arrStart() | ||
| traceWriter.newLine() | ||
|
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| private val pid = ManagementFactory.getRuntimeMXBean().getName().replaceAll("@.*", "") | ||
|
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| override def close(): Unit = { | ||
| arrEnd() | ||
| objEnd() | ||
| context.pop() | ||
| tidCache.remove() | ||
| traceWriter.close() | ||
| } | ||
|
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| def traceDurationEvent(name: String, startNanos: Long, durationNanos: Long, tid: String = this.tid(), pidSuffix: String = ""): Unit = { | ||
| val durationMicros = nanosToMicros(durationNanos) | ||
| val startMicros = nanosToMicros(startNanos) | ||
| objStart() | ||
| str("cat", "scalac") | ||
| str("name", name) | ||
| str("ph", EventType.Complete) | ||
| str("tid", tid) | ||
| writePid(pidSuffix) | ||
| lng("ts", startMicros) | ||
| lng("dur", durationMicros) | ||
| objEnd() | ||
| traceWriter.newLine() | ||
| } | ||
|
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| private def writePid(pidSuffix: String) = { | ||
| if (pidSuffix == "") | ||
| str("pid", pid) | ||
| else | ||
| str2("pid", pid, "-", pidSuffix) | ||
| } | ||
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| def traceCounterEvent(name: String, counterName: String, count: Long, processWide: Boolean): Unit = { | ||
| objStart() | ||
| str("cat", "scalac") | ||
| str("name", name) | ||
| str("ph", EventType.Counter) | ||
| str("tid", tid()) | ||
| writePid(pidSuffix = if (processWide) "" else tid()) | ||
| lng("ts", microTime()) | ||
| fld("args") | ||
| objStart() | ||
| lng(counterName, count) | ||
| objEnd() | ||
| objEnd() | ||
| traceWriter.newLine() | ||
| } | ||
|
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| def traceDurationEventStart(cat: String, name: String, colour: String = "", pidSuffix: String = tid()): Unit = traceDurationEventStartEnd(EventType.Start, cat, name, colour, pidSuffix) | ||
| def traceDurationEventEnd(cat: String, name: String, colour: String = "", pidSuffix: String = tid()): Unit = traceDurationEventStartEnd(EventType.End, cat, name, colour, pidSuffix) | ||
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| private def traceDurationEventStartEnd(eventType: String, cat: String, name: String, colour: String, pidSuffix: String = ""): Unit = { | ||
| objStart() | ||
| str("cat", cat) | ||
| str("name", name) | ||
| str("ph", eventType) | ||
| writePid(pidSuffix) | ||
| str("tid", tid()) | ||
| lng("ts", microTime()) | ||
| if (colour != "") { | ||
| str("cname", colour) | ||
| } | ||
| objEnd() | ||
| traceWriter.newLine() | ||
| } | ||
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| private def tid(): String = tidCache.get() | ||
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| private def nanosToMicros(t: Long): Long = TimeUnit.NANOSECONDS.toMicros(t) | ||
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| private def microTime(): Long = nanosToMicros(System.nanoTime()) | ||
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| private sealed abstract class JsonContext | ||
| private case class ArrayContext(var first: Boolean) extends JsonContext | ||
| private case class ObjectContext(var first: Boolean) extends JsonContext | ||
| private case object ValueContext extends JsonContext | ||
| private case object TopContext extends JsonContext | ||
|
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| private def str(name: String, value: String): Unit = { | ||
| fld(name) | ||
| traceWriter.write("\"") | ||
| traceWriter.write(value) // This assumes no escaping is needed | ||
| traceWriter.write("\"") | ||
| } | ||
| private def str2(name: String, value: String, valueContinued1: String, valueContinued2: String): Unit = { | ||
| fld(name) | ||
| traceWriter.write("\"") | ||
| traceWriter.write(value) // This assumes no escaping is needed | ||
| traceWriter.write(valueContinued1) // This assumes no escaping is needed | ||
| traceWriter.write(valueContinued2) // This assumes no escaping is needed | ||
| traceWriter.write("\"") | ||
| } | ||
| private def lng(name: String, value: Long): Unit = { | ||
| fld(name) | ||
| traceWriter.write(String.valueOf(value)) | ||
| traceWriter.write("") | ||
| } | ||
| private def objStart(): Unit = { | ||
| context.top match { | ||
| case ac @ ArrayContext(first) => | ||
| if (first) ac.first = false | ||
| else traceWriter.write(",") | ||
| case _ => | ||
| } | ||
| context.push(ObjectContext(true)) | ||
| traceWriter.write("{") | ||
| } | ||
| private def objEnd(): Unit = { | ||
| traceWriter.write("}") | ||
| context.pop() | ||
| } | ||
| private def arrStart(): Unit = { | ||
| traceWriter.write("[") | ||
| context.push(ArrayContext(true)) | ||
| } | ||
| private def arrEnd(): Unit = { | ||
| traceWriter.write("]") | ||
| context.pop() | ||
| } | ||
|
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| private def fld(name: String) = { | ||
| val topContext = context.top | ||
| topContext match { | ||
| case oc @ ObjectContext(first) => | ||
| if (first) oc.first = false | ||
| else traceWriter.write(",") | ||
| case context => | ||
| throw new IllegalStateException("Wrong context: " + context) | ||
| } | ||
| traceWriter.write("\"") | ||
| traceWriter.write(name) | ||
| traceWriter.write("\"") | ||
| traceWriter.write(":") | ||
| } | ||
| } |
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