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package ch.jodersky.sbt.jni
package util
import java.io.{ File, FileInputStream, Closeable }
import scala.collection.mutable.{ HashSet }
import org.objectweb.asm.{ ClassReader, ClassVisitor, MethodVisitor, Opcodes }
object BytecodeUtil {
private class NativeFinder extends ClassVisitor(Opcodes.ASM5) {
// classes found to contain at least one @native def
val _nativeClasses = new HashSet[String]
def nativeClasses = _nativeClasses.toSet
private var fullyQualifiedName: String = ""
override def visit(version: Int, access: Int, name: String, signature: String,
superName: String, interfaces: Array[String]): Unit = {
fullyQualifiedName = name.replaceAll("/", ".")
}
override def visitMethod(access: Int, name: String, desc: String,
signature: String, exceptions: Array[String]): MethodVisitor = {
val isNative = (access & Opcodes.ACC_NATIVE) != 0
if (isNative) {
_nativeClasses += fullyQualifiedName
}
null //return null, do not visit method further
}
}
private def using[A >: Null <: Closeable, R](mkStream: => A)(action: A => R): R = {
var stream: A = null
try {
stream = mkStream
action(stream)
} finally {
if (stream != null) {
stream.close()
}
}
}
/** Finds classes containing native implementations.
* @param classFile java class file from which classes are read
* @return all fully qualified names of classes that contain at least one member annotated
* with @native
*/
def nativeClasses(classFile: File): Set[String] = using(new FileInputStream(classFile)) { in =>
val reader = new ClassReader(in)
val finder = new NativeFinder
reader.accept(finder, 0)
finder.nativeClasses
}
}
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