diff options
Diffstat (limited to 'test/junit/scala/tools/nsc/backend/jvm/BytecodeTest.scala')
-rw-r--r-- | test/junit/scala/tools/nsc/backend/jvm/BytecodeTest.scala | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/test/junit/scala/tools/nsc/backend/jvm/BytecodeTest.scala b/test/junit/scala/tools/nsc/backend/jvm/BytecodeTest.scala new file mode 100644 index 0000000000..00b6d1cc42 --- /dev/null +++ b/test/junit/scala/tools/nsc/backend/jvm/BytecodeTest.scala @@ -0,0 +1,198 @@ +package scala.tools.nsc.backend.jvm + +import org.junit.Assert._ +import org.junit.Test +import org.junit.runner.RunWith +import org.junit.runners.JUnit4 + +import scala.tools.asm.Opcodes._ +import scala.tools.partest.ASMConverters._ +import scala.tools.testing.BytecodeTesting +import scala.tools.testing.BytecodeTesting._ + +@RunWith(classOf[JUnit4]) +class BytecodeTest extends BytecodeTesting { + import compiler._ + + @Test + def t6288bJumpPosition(): Unit = { + val code = + """object Case3 { // 01 + | def unapply(z: Any): Option[Int] = Some(-1) // 02 + | def main(args: Array[String]) { // 03 + | ("": Any) match { // 04 + | case x : String => // 05 + | println("case 0") // 06 println and jump at 6 + | case _ => // 07 + | println("default") // 08 println and jump at 8 + | } // 09 + | println("done") // 10 + | } + |} + """.stripMargin + val List(mirror, module) = compileClasses(code) + + val unapplyLineNumbers = getInstructions(module, "unapply").filter(_.isInstanceOf[LineNumber]) + assert(unapplyLineNumbers == List(LineNumber(2, Label(0))), unapplyLineNumbers) + + val expected = List( + LineNumber(4, Label(0)), + LineNumber(5, Label(5)), + Jump(IFEQ, Label(20)), + + LineNumber(6, Label(11)), + Invoke(INVOKEVIRTUAL, "scala/Predef$", "println", "(Ljava/lang/Object;)V", false), + Jump(GOTO, Label(33)), + + LineNumber(5, Label(20)), + Jump(GOTO, Label(24)), + + LineNumber(8, Label(24)), + Invoke(INVOKEVIRTUAL, "scala/Predef$", "println", "(Ljava/lang/Object;)V", false), + Jump(GOTO, Label(33)), + + LineNumber(10, Label(33)), + Invoke(INVOKEVIRTUAL, "scala/Predef$", "println", "(Ljava/lang/Object;)V", false) + ) + + val mainIns = getInstructions(module, "main") filter { + case _: LineNumber | _: Invoke | _: Jump => true + case _ => false + } + assertSameCode(mainIns, expected) + } + + @Test + def bytecodeForBranches(): Unit = { + val code = + """class C { + | def t1(b: Boolean) = if (b) 1 else 2 + | def t2(x: Int) = if (x == 393) 1 else 2 + | def t3(a: Array[String], b: AnyRef) = a != b && b == a + | def t4(a: AnyRef) = a == null || null != a + | def t5(a: AnyRef) = (a eq null) || (null ne a) + | def t6(a: Int, b: Boolean) = if ((a == 10) && b || a != 1) 1 else 2 + | def t7(a: AnyRef, b: AnyRef) = a == b + | def t8(a: AnyRef) = Nil == a || "" != a + |} + """.stripMargin + + val c = compileClass(code) + + // t1: no unnecessary GOTOs + assertSameCode(getMethod(c, "t1"), List( + VarOp(ILOAD, 1), Jump(IFEQ, Label(6)), + Op(ICONST_1), Jump(GOTO, Label(9)), + Label(6), Op(ICONST_2), + Label(9), Op(IRETURN))) + + // t2: no unnecessary GOTOs + assertSameCode(getMethod(c, "t2"), List( + VarOp(ILOAD, 1), IntOp(SIPUSH, 393), Jump(IF_ICMPNE, Label(7)), + Op(ICONST_1), Jump(GOTO, Label(10)), + Label(7), Op(ICONST_2), + Label(10), Op(IRETURN))) + + // t3: Array == is translated to reference equality, AnyRef == to null checks and equals + assertSameCode(getMethod(c, "t3"), List( + // Array == + VarOp(ALOAD, 1), VarOp(ALOAD, 2), Jump(IF_ACMPEQ, Label(23)), + // AnyRef == + VarOp(ALOAD, 2), VarOp(ALOAD, 1), VarOp(ASTORE, 3), Op(DUP), Jump(IFNONNULL, Label(14)), + Op(POP), VarOp(ALOAD, 3), Jump(IFNULL, Label(19)), Jump(GOTO, Label(23)), + Label(14), VarOp(ALOAD, 3), Invoke(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z", false), Jump(IFEQ, Label(23)), + Label(19), Op(ICONST_1), Jump(GOTO, Label(26)), + Label(23), Op(ICONST_0), + Label(26), Op(IRETURN))) + + val t4t5 = List( + VarOp(ALOAD, 1), Jump(IFNULL, Label(6)), + VarOp(ALOAD, 1), Jump(IFNULL, Label(10)), + Label(6), Op(ICONST_1), Jump(GOTO, Label(13)), + Label(10), Op(ICONST_0), + Label(13), Op(IRETURN)) + + // t4: one side is known null, so just a null check on the other + assertSameCode(getMethod(c, "t4"), t4t5) + + // t5: one side known null, so just a null check on the other + assertSameCode(getMethod(c, "t5"), t4t5) + + // t6: no unnecessary GOTOs + assertSameCode(getMethod(c, "t6"), List( + VarOp(ILOAD, 1), IntOp(BIPUSH, 10), Jump(IF_ICMPNE, Label(7)), + VarOp(ILOAD, 2), Jump(IFNE, Label(12)), + Label(7), VarOp(ILOAD, 1), Op(ICONST_1), Jump(IF_ICMPEQ, Label(16)), + Label(12), Op(ICONST_1), Jump(GOTO, Label(19)), + Label(16), Op(ICONST_2), + Label(19), Op(IRETURN))) + + // t7: universal equality + assertInvoke(getMethod(c, "t7"), "scala/runtime/BoxesRunTime", "equals") + + // t8: no null checks invoking equals on modules and constants + assertSameCode(getMethod(c, "t8"), List( + Field(GETSTATIC, "scala/collection/immutable/Nil$", "MODULE$", "Lscala/collection/immutable/Nil$;"), VarOp(ALOAD, 1), Invoke(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z", false), Jump(IFNE, Label(10)), + Ldc(LDC, ""), VarOp(ALOAD, 1), Invoke(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z", false), Jump(IFNE, Label(14)), + Label(10), Op(ICONST_1), Jump(GOTO, Label(17)), + Label(14), Op(ICONST_0), + Label(17), Op(IRETURN))) + } + + @Test // wrong local variable table for methods containing while loops + def t9179(): Unit = { + val code = + """class C { + | def t(): Unit = { + | var x = "" + | while (x != null) { + | foo() + | x = null + | } + | bar() + | } + | def foo(): Unit = () + | def bar(): Unit = () + |} + """.stripMargin + val c = compileClass(code) + val t = getMethod(c, "t") + val isFrameLine = (x: Instruction) => x.isInstanceOf[FrameEntry] || x.isInstanceOf[LineNumber] + assertSameCode(t.instructions.filterNot(isFrameLine), List( + Label(0), Ldc(LDC, ""), Label(3), VarOp(ASTORE, 1), + Label(5), VarOp(ALOAD, 1), Jump(IFNULL, Label(21)), + Label(10), VarOp(ALOAD, 0), Invoke(INVOKEVIRTUAL, "C", "foo", "()V", false), Label(14), Op(ACONST_NULL), VarOp(ASTORE, 1), Label(18), Jump(GOTO, Label(5)), + Label(21), VarOp(ALOAD, 0), Invoke(INVOKEVIRTUAL, "C", "bar", "()V", false), Label(26), Op(RETURN), Label(28))) + val labels = t.instructions collect { case l: Label => l } + val x = t.localVars.find(_.name == "x").get + assertEquals(x.start, labels(1)) + assertEquals(x.end, labels(7)) + } + + @Test + def sd186_traitLineNumber(): Unit = { + val code = + """trait T { + | def t(): Unit = { + | toString + | toString + | } + |} + """.stripMargin + val t = compileClass(code) + val tMethod = getMethod(t, "t$") + val invoke = Invoke(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;", false) + // ths static accessor is positioned at the line number of the accessed method. + assertSameCode(tMethod.instructions, + List(Label(0), LineNumber(2, Label(0)), VarOp(ALOAD, 0), Invoke(INVOKESPECIAL, "T", "t", "()V", true), Op(RETURN), Label(4)) + ) + } + + @Test + def sd233(): Unit = { + val code = "def f = { println(1); synchronized(println(2)) }" + val m = compileMethod(code) + val List(ExceptionHandler(_, _, _, desc)) = m.handlers + assert(desc == None, desc) + } +} |