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package test
import org.junit.Assert._
import org.junit.Test
class TestBCode extends DottyBytecodeTest {
import ASMConverters._
@Test def nullChecks = {
val source = """
|class Foo {
| def foo(x: AnyRef): Int = {
| val bool = x == null
| if (x != null) 1
| else 0
| }
|}
""".stripMargin
checkBCode(source) { dir =>
val clsIn = dir.lookupName("Foo.class", directory = false).input
val clsNode = loadClassNode(clsIn)
val methodNode = getMethod(clsNode, "foo")
correctNumberOfNullChecks(2, methodNode.instructions)
}
}
/** This test verifies that simple matches are transformed if possible
* despite no annotation
*/
@Test def basicTransformNonAnnotated = {
val source = """
|object Foo {
| def foo(i: Int) = i match {
| case 2 => println(2)
| case 1 => println(1)
| }
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Foo$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val methodNode = getMethod(moduleNode, "foo")
assert(verifySwitch(methodNode))
}
}
/** This test verifies that simple matches with `@switch` annotations are
* indeed transformed to a switch
*/
@Test def basicTransfromAnnotated = {
val source = """
|object Foo {
| import scala.annotation.switch
| def foo(i: Int) = (i: @switch) match {
| case 2 => println(2)
| case 1 => println(1)
| }
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Foo$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val methodNode = getMethod(moduleNode, "foo")
assert(verifySwitch(methodNode))
}
}
@Test def failTransform = {
val source = """
|object Foo {
| import scala.annotation.switch
| def foo(i: Any) = (i: @switch) match {
| case x: String => println("string!")
| case x :: xs => println("list!")
| }
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Foo$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val methodNode = getMethod(moduleNode, "foo")
assert(verifySwitch(methodNode, shouldFail = true))
}
}
/** Make sure that creating multidim arrays reduces to "multinewarray"
* instruction
*/
@Test def multidimArrays = {
val source = """
|object Arr {
| def arr = Array.ofDim[Int](2, 1)
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Arr$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val method = getMethod(moduleNode, "arr")
val hadCorrectInstr =
instructionsFromMethod(method)
.collect { case x @ NewArray(op, _, dims) if op == 197 && dims == 2 => x }
.length > 0
assert(hadCorrectInstr,
"Did not contain \"multianewarray\" instruction in:\n" +
instructionsFromMethod(method).mkString("\n"))
}
}
}
|
