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// Copyright 2021 Code Intelligence GmbH
//
// 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 com.code_intelligence.jazzer.instrumentor
import org.objectweb.asm.ClassReader
import org.objectweb.asm.ClassVisitor
import org.objectweb.asm.ClassWriter
import org.objectweb.asm.MethodVisitor
internal class HookInstrumentor(private val hooks: Iterable<Hook>, private val java6Mode: Boolean) : Instrumentor {
private lateinit var random: DeterministicRandom
override fun instrument(bytecode: ByteArray): ByteArray {
val reader = ClassReader(bytecode)
val writer = ClassWriter(reader, ClassWriter.COMPUTE_MAXS)
random = DeterministicRandom("hook", reader.className)
val interceptor = object : ClassVisitor(Instrumentor.ASM_API_VERSION, writer) {
override fun visitMethod(
access: Int,
name: String?,
descriptor: String?,
signature: String?,
exceptions: Array<String>?,
): MethodVisitor? {
val mv = cv.visitMethod(access, name, descriptor, signature, exceptions) ?: return null
return if (shouldInstrument(access))
makeHookMethodVisitor(access, descriptor, mv, hooks, java6Mode, random)
else
mv
}
}
reader.accept(interceptor, ClassReader.EXPAND_FRAMES)
return writer.toByteArray()
}
}
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