From a5cb5d6f08b0023f1a9f3fcd43c8066e56dd7699 Mon Sep 17 00:00:00 2001
From: Jason Zaugg <jzaugg@gmail.com>
Date: Wed, 20 Feb 2019 17:15:18 +1000
Subject: [PATCH] Benchmark for Symbol.info

---
 .../reflect/internal/SymbolBenchmark.scala    | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 test/benchmarks/src/main/scala/reflect/internal/SymbolBenchmark.scala

diff --git a/test/benchmarks/src/main/scala/reflect/internal/SymbolBenchmark.scala b/test/benchmarks/src/main/scala/reflect/internal/SymbolBenchmark.scala
new file mode 100644
index 000000000000..1f5389ec0c9d
--- /dev/null
+++ b/test/benchmarks/src/main/scala/reflect/internal/SymbolBenchmark.scala
@@ -0,0 +1,46 @@
+package scala.reflect.internal
+
+import org.openjdk.jmh.annotations._
+import org.openjdk.jmh.infra._
+import org.openjdk.jmh.runner.IterationType
+import benchmark._
+import java.util.concurrent.TimeUnit
+
+import scala.reflect.internal.util.BatchSourceFile
+
+@BenchmarkMode(Array(Mode.AverageTime))
+@Fork(2)
+@Threads(1)
+@Warmup(iterations = 10)
+@Measurement(iterations = 10)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Benchmark)
+class SymbolBenchmark {
+  import scala.tools.nsc._
+  var g: Global = _
+  var symbol: Global#Symbol = _
+
+  @Setup(Level.Trial)
+  def setup(): Unit = {
+    val settings = new Settings()
+    settings.usejavacp.value = true
+    settings.stopAfter.value = List("typer")
+    val global = new Global(settings)
+    g = global
+
+    val run = new global.Run()
+    val source = g.newSourceFile("package p1; class C { def foo: List[String] = Nil }")
+    run.compileSources(source :: Nil)
+    val foo = global.rootMirror.getClassIfDefined("p1.C").info.decl(global.newTermName("foo"))
+    symbol = foo
+  }
+
+  @Benchmark def measure(bh: Blackhole): Unit = {
+    val r = g.currentRun
+    g.phase = r.erasurePhase
+    bh.consume(symbol.info)
+    g.phase = r.typerPhase
+    bh.consume(symbol.info)
+
+  }
+}