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package scala.tools.nsc.backend.jvm
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import org.junit.Assert._
import CodeGenTools._
import scala.tools.asm.Opcodes._
import scala.tools.partest.ASMConverters._
@RunWith(classOf[JUnit4])
class DirectCompileTest {
val compiler = newCompiler(extraArgs = "-Ybackend:GenBCode")
@Test
def testCompile(): Unit = {
val List(("C.class", bytes)) = compile(compiler)(
"""
|class C {
| def f = 1
|}
""".stripMargin)
def s(i: Int, n: Int) = (bytes(i) & 0xff) << n
assertTrue((s(0, 24) | s(1, 16) | s(2, 8) | s(3, 0)) == 0xcafebabe) // mocha java latte machiatto surpreme dark roasted espresso
}
@Test
def testCompileClasses(): Unit = {
val List(cClass, cModuleClass) = compileClasses(compiler)(
"""
|class C
|object C
""".stripMargin)
assertTrue(cClass.name == "C")
assertTrue(cModuleClass.name == "C$")
val List(dMirror, dModuleClass) = compileClasses(compiler)(
"""
|object D
""".stripMargin)
assertTrue(dMirror.name == "D")
assertTrue(dModuleClass.name == "D$")
}
@Test
def testCompileMethods(): Unit = {
val List(f, g) = compileMethods(compiler)(
"""
|def f = 10
|def g = f
""".stripMargin)
assertTrue(f.name == "f")
assertTrue(g.name == "g")
assertTrue(instructionsFromMethod(f).dropNonOp ===
List(IntOp(BIPUSH, 10), Op(IRETURN)))
assertTrue(instructionsFromMethod(g).dropNonOp ===
List(VarOp(ALOAD, 0), Invoke(INVOKEVIRTUAL, "C", "f", "()I", false), Op(IRETURN)))
}
@Test
def testDropNonOpAliveLabels(): Unit = {
val List(f) = compileMethods(compiler)("""def f(x: Int) = if (x == 0) "a" else "b"""")
assertTrue(instructionsFromMethod(f).dropNonOp === List(
VarOp(ILOAD, 1),
Op(ICONST_0),
Jump(IF_ICMPEQ, Label(6)),
Jump(GOTO, Label(10)),
Label(6),
Ldc(LDC, "a"),
Jump(GOTO, Label(13)),
Label(10),
Ldc(LDC, "b"),
Label(13),
Op(ARETURN)
))
}
}
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