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|
/* ___ ____ ___ __ ___ ___
** / _// __// _ | / / / _ | / _ \ Scala classfile decoder
** __\ \/ /__/ __ |/ /__/ __ |/ ___/ (c) 2003-2013, LAMP/EPFL
** /____/\___/_/ |_/____/_/ |_/_/ http://scala-lang.org/
**
*/
package scala.tools.scalap
import java.io._
import scala.reflect.NameTransformer
class JavaWriter(classfile: Classfile, writer: Writer) extends CodeWriter(writer) {
val cf = classfile
def flagsToStr(clazz: Boolean, flags: Int): String = {
val buffer = new StringBuffer()
var x: StringBuffer = buffer
if (((flags & 0x0007) == 0) &&
((flags & 0x0002) != 0))
x = buffer.append("private ")
if ((flags & 0x0004) != 0)
x = buffer.append("protected ")
if ((flags & 0x0010) != 0)
x = buffer.append("final ")
if ((flags & 0x0400) != 0)
x = if (clazz) buffer.append("abstract ")
else buffer.append("/*deferred*/ ")
buffer.toString()
}
def nameToClass(str: String): String = {
val res = NameTransformer.decode(str.replace('/', '.'))
if (res == "java.lang.Object") "scala.Any" else res
}
def nameToClass0(str: String) = {
val res = NameTransformer.decode(str.replace('/', '.'))
if (res == "java.lang.Object") "scala.AnyRef" else res
}
def nameToSimpleClass(str: String) =
NameTransformer.decode(str.substring(str.lastIndexOf('/') + 1))
def nameToPackage(str: String) = {
val inx = str.lastIndexOf('/')
val name = if (inx == -1) str else str.substring(0, inx).replace('/', '.')
NameTransformer.decode(name)
}
def sigToType(str: String): String =
sigToType(str, 0)._1
def sigToType(str: String, i: Int): (String, Int) = str.charAt(i) match {
case 'B' => ("scala.Byte", i + 1)
case 'C' => ("scala.Char", i + 1)
case 'D' => ("scala.Double", i + 1)
case 'F' => ("scala.Float", i + 1)
case 'I' => ("scala.Int", i + 1)
case 'J' => ("scala.Long", i + 1)
case 'S' => ("scala.Short", i + 1)
case 'V' => ("scala.Unit", i + 1)
case 'Z' => ("scala.Boolean", i + 1)
case 'L' =>
val j = str.indexOf(';', i)
(nameToClass(str.substring(i + 1, j)), j + 1)
case '[' =>
val (tpe, j) = sigToType(str, i + 1)
("scala.Array[" + tpe + "]", j)
case '(' =>
val (tpe, j) = sigToType0(str, i + 1)
("(" + tpe, j)
case ')' =>
val (tpe, j) = sigToType(str, i + 1)
("): " + tpe, j)
}
def sigToType0(str: String, i: Int): (String, Int) =
if (str.charAt(i) == ')')
sigToType(str, i)
else {
val (tpe, j) = sigToType(str, i)
if (str.charAt(j) == ')') {
val (rest, k) = sigToType(str, j)
(tpe + rest, k)
} else {
val (rest, k) = sigToType0(str, j)
(tpe + ", " + rest, k)
}
}
def getName(n: Int): String = {
import cf.pool._
cf.pool(n) match {
case UTF8(str) => str
case StringConst(m) => getName(m)
case ClassRef(m) => getName(m)
case _ => "<error>"
}
}
def getClassName(n: Int): String = nameToClass(getName(n))
def getSimpleClassName(n: Int): String = nameToSimpleClass(getName(n))
def getPackage(n: Int): String = nameToPackage(getName(n))
def getType(n: Int): String = sigToType(getName(n))
def isStatic(flags: Int) = (flags & 0x0008) != 0
def isInterface(flags: Int) = (flags & 0x0200) != 0
def isConstr(name: String) = (name == "<init>")
def printField(flags: Int, name: Int, tpe: Int, attribs: List[cf.Attribute]) {
print(flagsToStr(false, flags))
if ((flags & 0x0010) != 0)
print("val " + NameTransformer.decode(getName(name)))
else
print("final var " + NameTransformer.decode(getName(name)))
print(": " + getType(tpe) + ";").newline
}
def printMethod(flags: Int, name: Int, tpe: Int, attribs: List[cf.Attribute]) {
if (getName(name) == "<init>")
print(flagsToStr(false, flags))
if (getName(name) == "<init>") {
print("def this" + getType(tpe) + ";").newline
}
else {
print("def " + NameTransformer.decode(getName(name)))
print(getType(tpe) + ";").newline
}
attribs find {
case cf.Attribute(name, _) => getName(name) == "Exceptions"
} match {
case Some(cf.Attribute(_, data)) =>
val n = ((data(0) & 0xff) << 8) + (data(1) & 0xff)
indent.print("throws ")
for (i <- Iterator.range(0, n) map {x => 2 * (x + 1)}) {
val inx = ((data(i) & 0xff) << 8) + (data(i+1) & 0xff)
if (i > 2) print(", ")
print(getClassName(inx).trim())
}
undent.newline
case None =>
}
}
def printClassHeader() {
if (isInterface(cf.flags)) {
print("trait " + getSimpleClassName(cf.classname))
} else {
print("class " + getSimpleClassName(cf.classname))
if (cf.pool(cf.superclass) != null)
print(" extends " + nameToClass0(getName(cf.superclass)))
}
cf.interfaces foreach {
n => print(" with " + getClassName(n))
}
}
def printClass() {
val pck = getPackage(cf.classname);
if (pck.length() > 0)
println("package " + pck + ";")
print(flagsToStr(true, cf.flags))
cf.attribs find {
case cf.Attribute(name, _) => getName(name) == "JacoMeta"
} match {
case None =>
printClassHeader;
case Some(cf.Attribute(_, data)) =>
val mp = new MetaParser(getName(
((data(0) & 0xff) << 8) + (data(1) & 0xff)).trim());
mp.parse match {
case None => printClassHeader;
case Some(str) =>
if (isInterface(cf.flags))
print("trait " + getSimpleClassName(cf.classname) + str);
else
print("class " + getSimpleClassName(cf.classname) + str);
}
}
var statics: List[cf.Member] = Nil
print(" {").indent.newline
cf.fields foreach {
case m@cf.Member(_, flags, name, tpe, attribs) =>
if (isStatic(flags))
statics = m :: statics
else
printField(flags, name, tpe, attribs)
}
cf.methods foreach {
case m@cf.Member(_, flags, name, tpe, attribs) =>
if (isStatic(flags))
statics = m :: statics
else
printMethod(flags, name, tpe, attribs)
}
undent.print("}").newline
if (!statics.isEmpty) {
print("object " + getSimpleClassName(cf.classname) + " {")
indent.newline
statics foreach {
case cf.Member(true, flags, name, tpe, attribs) =>
printField(flags, name, tpe, attribs)
case cf.Member(false, flags, name, tpe, attribs) =>
if (getName(name) != "<clinit>")
printMethod(flags, name, tpe, attribs)
}
undent.print("}").newline
}
}
}
|
