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A library for fast runtime class-querying, and more
/*
---------------------------------------------------------------------------
This software is released under a BSD license, adapted from
http://opensource.org/licenses/bsd-license.php
Copyright (c) 2010, Brian M. Clapper
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the names "clapper.org", "Grizzled ClassUtil", nor the names of
its contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/
/** The ASM-specific implementation of the Class Finder capabilities.
*/
package org.clapper.classutil.asm
import org.clapper.classutil._
import scala.collection.mutable.{Set => MutableSet, ArrayBuilder}
import scala.collection.mutable.HashMap
import org.objectweb.asm._
import java.io.{File, InputStream, IOException}
import scala.Some
private[classutil] object ASMBitmapMapper {
import java.lang.reflect.{Modifier => JModifier}
val AccessMap = HashMap(
Opcodes.ACC_ABSTRACT -> Modifier.Abstract,
Opcodes.ACC_FINAL -> Modifier.Final,
Opcodes.ACC_INTERFACE -> Modifier.Interface,
Opcodes.ACC_NATIVE -> Modifier.Native,
Opcodes.ACC_PRIVATE -> Modifier.Private,
Opcodes.ACC_PROTECTED -> Modifier.Protected,
Opcodes.ACC_PUBLIC -> Modifier.Public,
Opcodes.ACC_STATIC -> Modifier.Static,
Opcodes.ACC_STRICT -> Modifier.Strict,
Opcodes.ACC_SYNCHRONIZED -> Modifier.Synchronized,
Opcodes.ACC_SYNTHETIC -> Modifier.Synthetic,
Opcodes.ACC_TRANSIENT -> Modifier.Transient,
Opcodes.ACC_VOLATILE -> Modifier.Volatile
)
}
private[classutil] trait ASMBitmapMapper {
def mapModifiers(bitmap: Int, map: HashMap[Int, Modifier.Modifier]):
Set[Modifier.Modifier] = {
// Map the class's modifiers integer bitmap into a set of Modifier
// enumeration values by filtering and keeping only the ones that
// match the masks, extracting the corresponding map value, and
// converting the whole thing to a set.
//
// Mutable collections are used for speed.
val result = MutableSet[Modifier.Modifier]()
for(pair <- map) {
if((pair._1 & bitmap) != 0)
result += pair._2
}
result.toSet
}
}
private[classutil] class ClassInfoImpl(val name: String,
val superClassName: String,
val interfaces: List[String],
val signature: String,
val access: Int,
val location: File)
extends ClassInfo with ASMBitmapMapper {
def methods = Set.empty[MethodInfo] ++ methodSet
def fields = Set.empty[FieldInfo] ++ fieldSet
def annotations = Set.empty[AnnotationInfo] ++ annotationSet
var methodSet = MutableSet.empty[MethodInfo]
var fieldSet = MutableSet.empty[FieldInfo]
var annotationSet = MutableSet.empty[AnnotationInfo]
val modifiers = mapModifiers(access, ASMBitmapMapper.AccessMap)
}
private[classutil] class MethodInfoImpl(val name: String,
val signature: String,
val descriptor: String,
val exceptions: List[String],
val access: Int)
extends MethodInfo with ASMBitmapMapper {
val modifiers = mapModifiers(access, ASMBitmapMapper.AccessMap)
}
private[classutil] class FieldInfoImpl(val name: String,
val signature: String,
val descriptor: String,
val value: Option[java.lang.Object],
val access: Int)
extends FieldInfo with ASMBitmapMapper {
val modifiers = mapModifiers(access, ASMBitmapMapper.AccessMap)
}
private[classutil] class AnnotationInfoImpl(val descriptor: String,
val visible: Boolean)
extends AnnotationInfo {
def params = Map.empty[String, Any] ++ paramMap
var paramMap = HashMap.empty[String, Any]
}
private[classutil] class ClassVisitor(location: File)
extends ASMEmptyVisitor with ASMBitmapMapper {
var classes = MutableSet.empty[ClassInfo]
var currentClass: Option[ClassInfoImpl] = None
override def visit(version: Int,
access: Int,
name: String,
signature: String,
superName: String,
interfaces: Array[String]) {
val sig = if (signature != null) signature else ""
val classInfo = new ClassInfoImpl(mapClassName(name),
mapClassName(superName),
interfaces.toList.map(mapClassName(_)),
sig,
access,
location)
classes += classInfo
currentClass = Some(classInfo)
}
override def visitMethod(access: Int,
name: String,
descriptor: String,
signature: String,
exceptions: Array[String]): MethodVisitor = {
assert(currentClass != None)
val sig = if (signature != null) signature else ""
val excList = if (exceptions == null) Nil else exceptions.toList
currentClass.get.methodSet += new MethodInfoImpl(name,
sig,
descriptor,
excList,
access)
null
}
override def visitField(access: Int,
name: String,
descriptor: String,
signature: String,
value: java.lang.Object): FieldVisitor = {
assert(currentClass != None)
val sig = if (signature != null) signature else ""
val initialVal = Option(value)
currentClass.get.fieldSet += new FieldInfoImpl(name,
sig,
descriptor,
initialVal,
access)
null
}
class AnnotationVisitor(annotationInfo: AnnotationInfoImpl)
extends org.objectweb.asm.AnnotationVisitor(api) {
override def visit(name: String, value: Any) =
annotationInfo.paramMap += (name -> value)
override def visitEnum(name: String, desc: String, value: String) =
annotationInfo.paramMap += (name -> value)
override def visitAnnotation(name: String, desc: String) = {
val innerAnnInfo = new AnnotationInfoImpl(desc, annotationInfo.visible)
annotationInfo.paramMap += (name -> innerAnnInfo)
new AnnotationVisitor(innerAnnInfo)
}
override def visitArray(name: String) = new AnnotationArrayVisitor {
override def visitEnd(): Unit = annotationInfo.paramMap += (name -> arrBuilder.result)
}
}
class AnnotationArrayVisitor extends org.objectweb.asm.AnnotationVisitor(api) {
protected val arrBuilder = ArrayBuilder.make[Any]
override def visit(name: String, value: Any) = arrBuilder += value
override def visitEnum(name: String, desc: String, value: String) = arrBuilder += value
override def visitAnnotation(name: String, desc: String) = {
val innerAnnInfo = new AnnotationInfoImpl(desc, false)
arrBuilder += innerAnnInfo
new AnnotationVisitor(innerAnnInfo)
}
override def visitArray(name: String) = {
val outer = this
new AnnotationArrayVisitor {
override def visitEnd(): Unit = outer.arrBuilder += arrBuilder.result
}
}
}
override def visitAnnotation(descriptor: String,
visible: Boolean): AnnotationVisitor = {
assert(currentClass != None)
val annotationInfo = new AnnotationInfoImpl(descriptor, visible)
currentClass.get.annotationSet += annotationInfo
new AnnotationVisitor(annotationInfo)
}
private def mapClassName(name: String): String = {
if (name == null) ""
else name.replaceAll("/", ".")
}
}
private[classutil] object ClassFile {
val ASMAcceptCriteria = 0
def load(is: InputStream, location: File): Iterator[ClassInfo] = {
val cr = new ClassReader(is)
val visitor = new ClassVisitor(location)
cr.accept(visitor, ASMAcceptCriteria)
visitor.classes.toIterator
}
}
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