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import scala.tools.partest.BytecodeTest
import scala.tools.asm
import asm.tree.InsnList
import scala.collection.JavaConverters._
object Test extends BytecodeTest {
def show: Unit = {
val classNode = loadClassNode("Foo_1")
val methodNode = getMethod(classNode, "foo")
// if optimization didn't run then
// there should be some useless instructions
// with the magic constant 3
val expected = 1
val got = countMagicThrees(methodNode.instructions)
assert(got == expected, s"expected $expected but got $got magic threes")
}
def countMagicThrees(insnList: InsnList): Int = {
def isMagicThree(node: asm.tree.AbstractInsnNode): Boolean =
(node.getOpcode == asm.Opcodes.ICONST_3)
insnList.iterator.asScala.count(isMagicThree)
}
}
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