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import java.io.{File, FileOutputStream}
import scala.tools.nsc.settings.ScalaVersion
import scala.tools.partest._
import scala.tools.asm
import asm.{AnnotationVisitor, ClassWriter, FieldVisitor, Handle, MethodVisitor, Opcodes}
import Opcodes._
// This test ensures that we can read JDK 7 (classfile format 51) files, including those
// with invokeDynamic instructions and associated constant pool entries
// to do that it first uses ASM to generate a class called DynamicInvoker. Then
// it runs a normal compile on the source in the 'code' field that refers to
// DynamicInvoker. Any failure will be dumped to std out.
//
// By its nature the test can only work on JDK 7+ because under JDK 6 some of the
// classes referred to by DynamicInvoker won't be available and DynamicInvoker won't
// verify. So the test includes a version check that short-circuits the whole test
// on JDK 6
object Test extends DirectTest {
override def extraSettings: String = "-optimise -usejavacp -d " + testOutput.path + " -cp " + testOutput.path
def generateClass() {
val invokerClassName = "DynamicInvoker"
val bootstrapMethodName = "bootstrap"
val bootStrapMethodType = "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;"
val targetMethodName = "target"
val targetMethodType = "()Ljava/lang/String;"
val cw = new ClassWriter(0)
cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, invokerClassName, null, "java/lang/Object", null)
val constructor = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null)
constructor.visitCode()
constructor.visitVarInsn(ALOAD, 0)
constructor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false)
constructor.visitInsn(RETURN)
constructor.visitMaxs(1, 1)
constructor.visitEnd()
val target = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, targetMethodName, targetMethodType, null, null)
target.visitCode()
target.visitLdcInsn("hello")
target.visitInsn(ARETURN)
target.visitMaxs(1, 1)
target.visitEnd()
val bootstrap = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, bootstrapMethodName, bootStrapMethodType, null, null)
bootstrap.visitCode()
// val lookup = MethodHandles.lookup();
bootstrap.visitMethodInsn(INVOKESTATIC, "java/lang/invoke/MethodHandles", "lookup", "()Ljava/lang/invoke/MethodHandles$Lookup;", false)
bootstrap.visitVarInsn(ASTORE, 3) // lookup
// val clazz = lookup.lookupClass();
bootstrap.visitVarInsn(ALOAD, 3) // lookup
bootstrap.visitMethodInsn(INVOKEVIRTUAL, "java/lang/invoke/MethodHandles$Lookup", "lookupClass", "()Ljava/lang/Class;", false)
bootstrap.visitVarInsn(ASTORE, 4) // clazz
// val methodType = MethodType.fromMethodDescriptorString("()Ljava/lang/String, clazz.getClassLoader()")
bootstrap.visitLdcInsn("()Ljava/lang/String;")
bootstrap.visitVarInsn(ALOAD, 4) // CLAZZ
bootstrap.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getClassLoader", "()Ljava/lang/ClassLoader;", false)
bootstrap.visitMethodInsn(INVOKESTATIC, "java/lang/invoke/MethodType", "fromMethodDescriptorString", "(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/invoke/MethodType;", false)
bootstrap.visitVarInsn(ASTORE, 5) // methodType
// val methodHandle = lookup.findStatic(thisClass, "target", methodType)
bootstrap.visitVarInsn(ALOAD, 3) // lookup
bootstrap.visitVarInsn(ALOAD, 4) // clazz
bootstrap.visitLdcInsn("target")
bootstrap.visitVarInsn(ALOAD, 5) // methodType
bootstrap.visitMethodInsn(INVOKEVIRTUAL, "java/lang/invoke/MethodHandles$Lookup", "findStatic", "(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/MethodHandle;", false)
bootstrap.visitVarInsn(ASTORE, 6) // methodHandle
// new ConstantCallSite(methodHandle)
bootstrap.visitTypeInsn(NEW, "java/lang/invoke/ConstantCallSite")
bootstrap.visitInsn(DUP)
bootstrap.visitVarInsn(ALOAD, 6) // methodHandle
bootstrap.visitMethodInsn(INVOKESPECIAL, "java/lang/invoke/ConstantCallSite", "<init>", "(Ljava/lang/invoke/MethodHandle;)V", false)
bootstrap.visitInsn(ARETURN)
bootstrap.visitMaxs(4,7)
bootstrap.visitEnd()
val test = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "test", s"()Ljava/lang/String;", null, null)
test.visitCode()
val bootstrapHandle = new Handle(H_INVOKESTATIC, invokerClassName, bootstrapMethodName, bootStrapMethodType)
test.visitInvokeDynamicInsn("invoke", targetMethodType, bootstrapHandle)
test.visitInsn(ARETURN)
test.visitMaxs(1, 1)
test.visitEnd()
cw.visitEnd()
val bytes = cw.toByteArray()
val fos = new FileOutputStream(new File(s"${testOutput.path}/$invokerClassName.class"))
try
fos write bytes
finally
fos.close()
}
def code =
"""
object Driver {
val invoker = new DynamicInvoker()
println(invoker.test())
}
"""
override def show(): Unit = {
// redirect err to out, for logging
val prevErr = System.err
System.setErr(System.out)
try {
// this test is only valid under JDK 1.7+
testUnderJavaAtLeast("1.7") {
generateClass()
compile()
()
} otherwise {
()
}
}
finally
System.setErr(prevErr)
}
}
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