summaryrefslogtreecommitdiff
path: root/src/partest-extras/scala/tools/partest/instrumented/Instrumentation.scala
diff options
context:
space:
mode:
Diffstat (limited to 'src/partest-extras/scala/tools/partest/instrumented/Instrumentation.scala')
-rw-r--r--src/partest-extras/scala/tools/partest/instrumented/Instrumentation.scala93
1 files changed, 93 insertions, 0 deletions
diff --git a/src/partest-extras/scala/tools/partest/instrumented/Instrumentation.scala b/src/partest-extras/scala/tools/partest/instrumented/Instrumentation.scala
new file mode 100644
index 0000000000..18dd740208
--- /dev/null
+++ b/src/partest-extras/scala/tools/partest/instrumented/Instrumentation.scala
@@ -0,0 +1,93 @@
+/* NEST (New Scala Test)
+ * Copyright 2007-2013 LAMP/EPFL
+ * @author Grzegorz Kossakowski
+ */
+
+package scala.tools.partest.instrumented
+
+import scala.collection.JavaConverters._
+
+case class MethodCallTrace(className: String, methodName: String, methodDescriptor: String) {
+ override def toString(): String = className + "." + methodName + methodDescriptor
+}
+object MethodCallTrace {
+ implicit val ordering: Ordering[MethodCallTrace] = Ordering.by(x => (x.className, x.methodName, x.methodDescriptor))
+}
+
+/**
+ * An object that controls profiling of instrumented byte-code. The instrumentation is achieved
+ * by using `java.lang.instrument` package. The instrumentation agent can be found in
+ * `scala.tools.partest.javaagent` package.
+ *
+ * At the moment the following classes are being instrumented:
+ * * all classes with empty package
+ * * all classes from scala package (except for classes responsible for instrumentation)
+ *
+ * The canonical way of using instrumentation is have a test-case in `files/instrumented` directory.
+ * The following code in main:
+ *
+ * {{{
+ * import scala.tools.partest.instrumented.Instrumentation._
+ * def main(args: Array[String]): Unit = {
+ * startProfiling()
+ * // should box the boolean
+ println(true)
+ stopProfiling()
+ printStatistics()
+ * }
+ * }}}
+ *
+ *
+ * should print:
+ *
+ * {{{
+ * true
+ * Method call statistics:
+ * scala/Predef$.println(Ljava/lang/Object;)V: 1
+ * scala/runtime/BoxesRunTime.boxToBoolean(Z)Ljava/lang/Boolean;: 1
+ * }}}
+ */
+object Instrumentation {
+
+ type Statistics = Map[MethodCallTrace, Int]
+
+ def startProfiling(): Unit = Profiler.startProfiling()
+ def stopProfiling(): Unit = Profiler.stopProfiling()
+ def resetProfiling(): Unit = Profiler.resetProfiling()
+ def isProfiling(): Boolean = Profiler.isProfiling()
+
+ def getStatistics: Statistics = {
+ val isProfiling = Profiler.isProfiling()
+ if (isProfiling) {
+ Profiler.stopProfiling()
+ }
+ val stats = Profiler.getStatistics().asScala.toSeq.map {
+ case (trace, count) => MethodCallTrace(trace.className, trace.methodName, trace.methodDescriptor) -> count.intValue
+ }
+ val res = Map(stats: _*)
+ if (isProfiling) {
+ Profiler.startProfiling()
+ }
+ res
+ }
+
+ val standardFilter: MethodCallTrace => Boolean = t => {
+ // ignore all calls to Console trigger by printing
+ t.className != "scala/Console$" &&
+ // console accesses DynamicVariable, let's discard it too
+ !t.className.startsWith("scala/util/DynamicVariable")
+ }
+
+ // Used in tests.
+ def printStatistics(stats: Statistics = getStatistics, filter: MethodCallTrace => Boolean = standardFilter): Unit = {
+ val stats = getStatistics
+ println("Method call statistics:")
+ val toBePrinted = stats.toSeq.filter(p => filter(p._1)).sortBy(_._1)
+ // <count> <trace>
+ val format = "%5d %s\n"
+ toBePrinted foreach {
+ case (trace, count) => printf(format, count, trace)
+ }
+ }
+
+}