diff options
Diffstat (limited to 'test/junit/scala/tools/nsc/backend/jvm/opt/AnalyzerTest.scala')
-rw-r--r-- | test/junit/scala/tools/nsc/backend/jvm/opt/AnalyzerTest.scala | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/test/junit/scala/tools/nsc/backend/jvm/opt/AnalyzerTest.scala b/test/junit/scala/tools/nsc/backend/jvm/opt/AnalyzerTest.scala new file mode 100644 index 0000000000..930f7f2f10 --- /dev/null +++ b/test/junit/scala/tools/nsc/backend/jvm/opt/AnalyzerTest.scala @@ -0,0 +1,63 @@ +package scala.tools.nsc +package backend.jvm +package opt + +import org.junit.runner.RunWith +import org.junit.runners.JUnit4 +import org.junit.Test +import org.junit.Assert._ + +import scala.tools.asm.tree._ +import scala.tools.asm.tree.analysis._ +import scala.tools.nsc.backend.jvm.analysis.{AliasingFrame, AliasingAnalyzer} + +import CodeGenTools._ +import scala.tools.partest.ASMConverters +import ASMConverters._ +import AsmUtils._ +import BackendReporting._ +import BytecodeUtils._ + +import scala.collection.JavaConverters._ +import scala.tools.testing.ClearAfterClass + +object AnalyzerTest extends ClearAfterClass.Clearable { + var noOptCompiler = newCompiler(extraArgs = "-Yopt:l:none") + def clear(): Unit = { noOptCompiler = null } +} + +@RunWith(classOf[JUnit4]) +class AnalyzerTest extends ClearAfterClass { + ClearAfterClass.stateToClear = AnalyzerTest + val noOptCompiler = AnalyzerTest.noOptCompiler + + @Test + def aliasingOfPrimitives(): Unit = { + val code = + """class C { + | def f(a: Int, b: Long) = { + | val c = a - b // a is converted with i2l + | val d = c + | val e = a + | // locals: 0 this -- 1 a -- 2-3 b -- 4-5 c -- 6-7 d -- 8 e + | e + d // e is converted with i2l + | } + |} + """.stripMargin + + val List(c) = compileClasses(noOptCompiler)(code) + val a = new AliasingAnalyzer(new BasicInterpreter) + val f = findAsmMethod(c, "f") + a.analyze("C", f) + + val List(_, i2l) = findInstr(f, "I2L") + val aliasesAtI2l = a.frameAt(i2l, f).asInstanceOf[AliasingFrame[_]].aliases + assertEquals(aliasesAtI2l(1).iterator.toList, List(1, 8, 9)) // a, e and stack top + assertEquals(aliasesAtI2l(4).iterator.toList, List(4, 6)) + + val List(add) = findInstr(f, "LADD") + val aliasesAtAdd = a.frameAt(add, f).asInstanceOf[AliasingFrame[_]].aliases + assertEquals(aliasesAtAdd(1).iterator.toList, List(1, 8)) // after i2l the value on the stack is no longer an alias + assertEquals(aliasesAtAdd(4).iterator.toList, List(4, 6, 10)) // c, d and stack top + } +} |