agent/src/main/java/com/code_intelligence/jazzer/instrumentor/Instrumentor.kt


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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 com.code_intelligence.jazzer.third_party.objectweb.asm.Opcodes
import com.code_intelligence.jazzer.third_party.objectweb.asm.tree.MethodNode

enum class InstrumentationType {
    CMP,
    COV,
    DIV,
    GEP,
    INDIR,
    NATIVE,
}

internal interface Instrumentor {
    fun instrument(bytecode: ByteArray): ByteArray

    fun shouldInstrument(access: Int): Boolean {
        return (access and Opcodes.ACC_ABSTRACT == 0) &&
            (access and Opcodes.ACC_NATIVE == 0)
    }

    fun shouldInstrument(method: MethodNode): Boolean {
        return shouldInstrument(method.access) &&
            method.instructions.size() > 0
    }

    companion object {
        const val ASM_API_VERSION = Opcodes.ASM9
    }
}