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package dotty.tools.backend.jvm
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$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val methodNode = getMethod(moduleNode, "foo")
assert(verifySwitch(methodNode, shouldFail = true))
}
}
/** Make sure that creating multidim arrays reduces to "multinewarray"
* instruction
*/
@Test def multidimArraysFromOfDim = {
val source = """
|object Arr {
| def arr = Array.ofDim[Int](2, 1)
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Arr$.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 == Opcode.multianewarray && dims == 2 => x
}
.length > 0
assert(hadCorrectInstr,
"Did not contain \"multianewarray\" instruction in:\n" +
instructionsFromMethod(method).mkString("\n"))
}
}
@Test def arraysFromOfDim = {
val source = """
|object Arr {
| def arr1 = Array.ofDim[Int](2)
| def arr2 = Array.ofDim[Unit](2)
| def arr3 = Array.ofDim[String](2)
| def arr4 = Array.ofDim[Map[String, String]](2)
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Arr$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val arr1 = getMethod(moduleNode, "arr1")
val arr2 = getMethod(moduleNode, "arr2")
val arr3 = getMethod(moduleNode, "arr3")
val arr1CorrectInstr =
instructionsFromMethod(arr1)
.collect {
case x @ IntOp(op, oprnd)
if op == Opcode.newarray && oprnd == Opcode.int => x
}
.length > 0
assert(arr1CorrectInstr,
"Did not contain \"multianewarray\" instruction in:\n" +
instructionsFromMethod(arr1).mkString("\n"))
val arr2CorrectInstr =
instructionsFromMethod(arr2)
.collect {
case x @ TypeOp(op, oprnd)
if op == Opcode.anewarray && oprnd == Opcode.boxedUnit => x
}
.length > 0
assert(arr2CorrectInstr,
"arr2 bytecode did not contain correct `anewarray` instruction:\n" +
instructionsFromMethod(arr2)mkString("\n"))
val arr3CorrectInstr =
instructionsFromMethod(arr3)
.collect {
case x @ TypeOp(op, oprnd)
if op == Opcode.anewarray && oprnd == Opcode.javaString => x
}
.length > 0
assert(arr3CorrectInstr,
"arr3 bytecode did not contain correct `anewarray` instruction:\n" +
instructionsFromMethod(arr3).mkString("\n"))
}
}
@Test def arraysFromDimAndFromNewEqual = {
val source = """
|object Arr {
| def arr1 = Array.ofDim[Int](2)
| def arr2 = new Array[Int](2)
|}""".stripMargin
checkBCode(source) { dir =>
val moduleIn = dir.lookupName("Arr$.class", directory = false)
val moduleNode = loadClassNode(moduleIn.input)
val arr1 = getMethod(moduleNode, "arr1")
val arr2 = getMethod(moduleNode, "arr2")
// First two instructions of `arr1` fetch the static reference to `Array`
val instructions1 = instructionsFromMethod(arr1).drop(2)
val instructions2 = instructionsFromMethod(arr2)
assert(instructions1 == instructions2,
"Creating arrays using `Array.ofDim[Int](2)` did not equal bytecode for `new Array[Int](2)`\n" +
diffInstructions(instructions1, instructions2))
}
}
}
|
