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|
/* ___ ____ ___ __ ___ ___
** / _// __// _ | / / / _ | / _ \ Scala classfile decoder
** __\ \/ /__/ __ |/ /__/ __ |/ ___/ (c) 2003-2013, LAMP/EPFL
** /____/\___/_/ |_/____/_/ |_/_/ http://scala-lang.org/
**
*/
package scala
package tools.scalap
import java.io.{ByteArrayOutputStream, OutputStreamWriter, PrintStream}
import scala.reflect.NameTransformer
import scala.tools.nsc.Settings
import scala.tools.nsc.classpath.{AggregateClassPath, ClassPathFactory}
import scala.tools.nsc.util.ClassPath
import scala.tools.util.PathResolver
import scalax.rules.scalasig._
/**The main object used to execute scalap on the command-line.
*
* @author Matthias Zenger, Stephane Micheloud, Burak Emir, Ilya Sergey
*/
class Main {
val SCALA_SIG = "ScalaSig"
val SCALA_SIG_ANNOTATION = "Lscala/reflect/ScalaSignature;"
val SCALA_LONG_SIG_ANNOTATION = "Lscala/reflect/ScalaLongSignature;"
val BYTES_VALUE = "bytes"
val versionMsg = "Scala classfile decoder %s -- %s\n".format(Properties.versionString, Properties.copyrightString)
/**Verbose program run?
*/
var verbose = false
var printPrivates = false
def isScalaFile(bytes: Array[Byte]): Boolean = {
val byteCode = ByteCode(bytes)
val classFile = ClassFileParser.parse(byteCode)
classFile.attribute("ScalaSig").isDefined
}
/**Processes the given Java class file.
*
* @param clazz the class file to be processed.
*/
def processJavaClassFile(clazz: Classfile): Unit = {
// construct a new output stream writer
val out = new OutputStreamWriter(Console.out)
val writer = new JavaWriter(clazz, out)
// print the class
writer.printClass()
out.flush()
}
def isPackageObjectFile(s: String) = s != null && (s.endsWith(".package") || s == "package")
def parseScalaSignature(scalaSig: ScalaSig, isPackageObject: Boolean) = {
val baos = new ByteArrayOutputStream
val stream = new PrintStream(baos)
val syms = scalaSig.topLevelClasses ++ scalaSig.topLevelObjects
syms.head.parent match {
// Partial match
case Some(p) if p.name != "<empty>" =>
val path = p.path
if (!isPackageObject) {
stream.print("package ")
stream.print(path)
stream.print("\n")
} else {
val i = path.lastIndexOf(".")
if (i > 0) {
stream.print("package ")
stream.print(path.substring(0, i))
stream.print("\n")
}
}
case _ =>
}
// Print classes
val printer = new ScalaSigPrinter(stream, printPrivates)
syms foreach (printer printSymbol _)
baos.toString
}
def decompileScala(bytes: Array[Byte], isPackageObject: Boolean): String = {
val byteCode = ByteCode(bytes)
val classFile = ClassFileParser.parse(byteCode)
ScalaSigParser.parse(classFile) match {
case Some(scalaSig) => parseScalaSignature(scalaSig, isPackageObject)
case None => ""
}
}
/** Executes scalap with the given arguments and classpath for the
* class denoted by `classname`.
*/
def process(args: Arguments, path: ClassPath)(classname: String): Unit = {
// find the classfile
val encName = classname match {
case "scala.AnyRef" => "java.lang.Object"
case _ =>
// we have to encode every fragment of a name separately, otherwise the NameTransformer
// will encode using unicode escaping dot separators as well
// we can afford allocations because this is not a performance critical code
classname.split('.').map(NameTransformer.encode).mkString(".")
}
path.findClassFile(encName) match {
case Some(classFile) =>
if (verbose) {
Console.println(Console.BOLD + "FILENAME" + Console.RESET + " = " + classFile.path)
}
val bytes = classFile.toByteArray
if (isScalaFile(bytes)) {
Console.println(decompileScala(bytes, isPackageObjectFile(encName)))
} else {
// construct a reader for the classfile content
val reader = new ByteArrayReader(classFile.toByteArray)
// parse the classfile
val clazz = new Classfile(reader)
processJavaClassFile(clazz)
}
// if the class corresponds to the artificial class scala.Any.
// (see member list in class scala.tool.nsc.symtab.Definitions)
case _ =>
Console.println(s"class/object $classname not found.")
}
}
}
object Main extends Main {
private object opts {
val cp = "-cp"
val help = "-help"
val classpath = "-classpath"
val showPrivateDefs = "-private"
val verbose = "-verbose"
val version = "-version"
val disableFlatClassPathCaching = "-YdisableFlatCpCaching"
val logClassPath = "-Ylog-classpath"
}
/** Prints usage information for scalap. */
def usage(): Unit = {
Console println s"""
|Usage: scalap {<option>} <name>
|where <name> is fully-qualified class name or <package_name>.package for package objects
|and <option> is
| ${opts.showPrivateDefs} print private definitions
| ${opts.verbose} print out additional information
| ${opts.version} print out the version number of scalap
| ${opts.help} display this usage message
| ${opts.classpath} <path> specify where to find user class files
| ${opts.cp} <path> specify where to find user class files
""".stripMargin.trim
}
def main(args: Array[String]): Unit =
// print usage information if there is no command-line argument
if (args.isEmpty) usage()
else {
val arguments = parseArguments(args)
if (arguments contains opts.version)
Console.println(versionMsg)
if (arguments contains opts.help)
usage()
verbose = arguments contains opts.verbose
printPrivates = arguments contains opts.showPrivateDefs
// construct a custom class path
val cpArg = List(opts.classpath, opts.cp) map arguments.getArgument reduceLeft (_ orElse _)
val settings = new Settings()
settings.YdisableFlatCpCaching.value = arguments contains opts.disableFlatClassPathCaching
settings.Ylogcp.value = arguments contains opts.logClassPath
val path = createClassPath(cpArg, settings)
// print the classpath if output is verbose
if (verbose)
Console.println(Console.BOLD + "CLASSPATH" + Console.RESET + " = " + path.asClassPathString)
// process all given classes
arguments.getOthers foreach process(arguments, path)
}
private def parseArguments(args: Array[String]) =
Arguments.Parser('-')
.withOption(opts.showPrivateDefs)
.withOption(opts.verbose)
.withOption(opts.version)
.withOption(opts.help)
.withOptionalArg(opts.classpath)
.withOptionalArg(opts.cp)
// TODO two temporary, hidden options to be able to test different classpath representations
.withOption(opts.disableFlatClassPathCaching)
.withOption(opts.logClassPath)
.parse(args)
private def createClassPath(cpArg: Option[String], settings: Settings) = cpArg match {
case Some(cp) =>
AggregateClassPath(new ClassPathFactory(settings).classesInExpandedPath(cp))
case _ =>
settings.classpath.value = "." // include '.' in the default classpath SI-6669
new PathResolver(settings).result
}
}
|
