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package scala.tools.nsc.backend.jvm
import org.junit.Assert._
import org.junit.Test
import scala.collection.JavaConverters
import scala.tools.asm.Opcodes
import scala.tools.asm.tree.ClassNode
import scala.tools.nsc.backend.jvm.CodeGenTools._
import JavaConverters._
import scala.tools.testing.ClearAfterClass
object DefaultMethodTest extends ClearAfterClass.Clearable {
var compiler = newCompiler(extraArgs = "-Ybackend:GenBCode")
def clear(): Unit = { compiler = null }
}
class DefaultMethodTest extends ClearAfterClass {
ClearAfterClass.stateToClear = DefaultMethodTest
val compiler = DefaultMethodTest.compiler
@Test
def defaultMethodsViaGenBCode(): Unit = {
import compiler._
val code = "package pack { trait T { def foo: Int }}"
object makeFooDefaultMethod extends Transformer {
val Foo = TermName("foo")
/** Transforms a single tree. */
override def transform(tree: compiler.Tree): compiler.Tree = tree match {
case dd @ DefDef(_, Foo, _, _, _, _) =>
dd.symbol.setFlag(reflect.internal.Flags.JAVA_DEFAULTMETHOD)
copyDefDef(dd)(rhs = Literal(Constant(1)).setType(definitions.IntTpe))
case _ => super.transform(tree)
}
}
val asmClasses: List[ClassNode] = readAsmClasses(compileTransformed(compiler)(code, Nil, makeFooDefaultMethod.transform(_)))
val foo = asmClasses.head.methods.iterator.asScala.toList.last
assertTrue("default method should not be abstract", (foo.access & Opcodes.ACC_ABSTRACT) == 0)
assertTrue("default method body emitted", foo.instructions.size() > 0)
}
}
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