generated from polyvariant/library-template
/
ClassFile.scala
187 lines (146 loc) · 5.18 KB
/
ClassFile.scala
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/*
* Copyright 2022 Polyvariant
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.polyvariant.classfile
import scodec.bits.ByteVector
import scodec.bits._
import java.nio.charset.StandardCharsets
case class ClassFile(
minorVersion: Int,
majorVersion: Int,
constants: ConstantPool,
accessFlags: Set[ClassAccessFlag],
thisClass: ConstantIndex[Constant.ClassInfo],
superClass: ConstantIndex[Constant.ClassInfo],
interfaces: List[ConstantIndex[Constant.ClassInfo]],
fields: List[FieldInfo],
methods: List[MethodInfo],
attributes: List[AttributeInfo],
)
final case class ConstantPool private (private val constants: Array[Constant | Null])
extends AnyVal {
// ConstantIndex is 1-based, so we subtract 1
def apply[A <: Constant](index: ConstantIndex[A]): Constant = constants(index.value - 1)
// Size declared in length byte
def declaredSize: Int = constants.length
// Amount of actual constants inside
def realSize: Int = constants.count(_ != null)
def constantList: List[Constant] = constants.toList.collect { case c: Constant => c }
def indexOf[C <: Constant](constant: C): Option[ConstantIndex[C]] =
constants.indexOf(constant) match {
case -1 => None
case i => Some(ConstantIndex(i + 1))
}
override def equals(another: Any): Boolean =
another match {
case that: ConstantPool => this.constantList == that.constantList
case _ => false
}
def append(c: Constant): ConstantPool = ConstantPool.apply(constantList.appended(c))
}
object ConstantPool {
def apply(constants: List[Constant]): ConstantPool =
new ConstantPool(
constants.flatMap { c =>
List(c) ++ List.fill(c.size - 1)(null)
}.toArray
)
}
case class ConstantIndex[C <: Constant](value: Int) {
def toNarrowEither: Either[this.type, ConstantIndexNarrow] =
if (value.isValidShort)
Right(ConstantIndexNarrow(value.toShort))
else
Left(this)
}
case class ConstantIndexNarrow(value: Short)
object ConstantIndex {
val init: ConstantIndex[Nothing] = ConstantIndex(1)
}
enum Constant {
def size: Int =
this match {
case _: LongInfo | _: DoubleInfo => 2
case _ => 1
}
case ClassInfo(nameIndex: ConstantIndex[Constant.Utf8Info])
case FieldRefInfo(
classIndex: ConstantIndex[Constant.ClassInfo],
nameAndTypeIndex: ConstantIndex[Constant],
)
case MethodRefInfo(
classIndex: ConstantIndex[Constant.ClassInfo],
nameAndTypeIndex: ConstantIndex[Constant],
)
case InterfaceMethodRefInfo(
classIndex: ConstantIndex[Constant.ClassInfo],
nameAndTypeIndex: ConstantIndex[Constant],
)
case StringInfo(stringIndex: ConstantIndex[Constant.Utf8Info])
case IntegerInfo(bytes: ByteVector)
case FloatInfo(bytes: ByteVector)
case LongInfo(highBytes: ByteVector, lowBytes: ByteVector)
case DoubleInfo(highBytes: ByteVector, lowBytes: ByteVector)
case NameAndTypeInfo(
nameIndex: ConstantIndex[Constant.Utf8Info],
descriptorIndex: ConstantIndex[Constant.Utf8Info],
)
case Utf8Info(bytes: String)
case MethodHandleInfo(referenceType: MethodReferenceKind, referenceIndex: ConstantIndex[Constant])
case MethodTypeInfo(descriptorIndex: ConstantIndex[Constant.NameAndTypeInfo])
case DynamicInfo(
bootstrapMethodAttrIndex: Int,
nameAndTypeIndex: ConstantIndex[Constant.NameAndTypeInfo],
)
case InvokeDynamicInfo(
bootstrapMethodAttrIndex: Int,
nameAndTypeIndex: ConstantIndex[Constant.NameAndTypeInfo],
)
case ModuleInfo(nameIndex: ConstantIndex[Constant.Utf8Info])
case PackageInfo(nameIndex: ConstantIndex[Constant.Utf8Info])
}
object Constant {
extension (utf8: Utf8Info) def asString: String = utf8.bytes
}
enum ClassAccessFlag {
case Public, Final, Super, Interface, Abstract, Synthetic, Annotation, Enum
}
enum FieldAccessFlag {
case Public, Private, Protected, Static, Final, Volatile, Transient, Synthetic, Enum
}
enum MethodAccessFlag {
case Public, Private, Protected, Static, Final, Synchronized, Bridge, Varargs, Native, Abstract,
Strict, Synthetic
}
enum MethodReferenceKind {
case GetField, GetStatic, PutField, PutStatic, InvokeVirtual, InvokeStatic, InvokeSpecial,
NewInvokeSpecial, InvokeInterface
}
case class FieldInfo(
accessFlags: Set[FieldAccessFlag],
nameIndex: ConstantIndex[Constant.Utf8Info],
descriptorIndex: ConstantIndex[Constant.Utf8Info],
attributes: List[AttributeInfo],
)
case class MethodInfo(
accessFlags: Set[MethodAccessFlag],
nameIndex: ConstantIndex[Constant.Utf8Info],
descriptorIndex: ConstantIndex[Constant.Utf8Info],
attributes: List[AttributeInfo],
)
case class AttributeInfo(
nameIndex: ConstantIndex[Constant.Utf8Info],
info: ByteVector,
)