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Mutate values to improve code coverage #213 #713
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Markoutte
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pelevin/213_Mutate_values_to_improve_code_coverage
Aug 24, 2022
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71 changes: 71 additions & 0 deletions
71
utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/FuzzerStatistics.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package org.utbot.fuzzer | ||
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| import kotlin.math.pow | ||
| import kotlin.random.Random | ||
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| /** | ||
| * Stores information that can be useful for fuzzing such as coverage, run count, etc. | ||
| */ | ||
| interface FuzzerStatistics<K> { | ||
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| val seeds: Collection<K> | ||
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| /** | ||
| * Returns a random seed to process. | ||
| */ | ||
| fun randomSeed(random: Random): K? | ||
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| fun randomValues(random: Random): List<FuzzedValue>? | ||
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| fun executions(seed: K): Int | ||
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| operator fun get(seed: K): List<FuzzedValue>? | ||
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| fun isEmpty(): Boolean | ||
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| fun isNotEmpty(): Boolean { | ||
| return !isEmpty() | ||
| } | ||
| } | ||
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| class TrieBasedFuzzerStatistics<V>( | ||
| private val values: LinkedHashMap<Trie.Node<V>, List<FuzzedValue>> = linkedMapOf() | ||
| ) : FuzzerStatistics<Trie.Node<V>> { | ||
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| override val seeds: Collection<Trie.Node<V>> | ||
| get() = values.keys | ||
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| override fun randomSeed(random: Random): Trie.Node<V>? { | ||
| return values.keys.elementAtOrNull(randomIndex(random)) | ||
| } | ||
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| override fun isEmpty(): Boolean { | ||
| return values.isEmpty() | ||
| } | ||
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| override fun isNotEmpty(): Boolean { | ||
| return values.isNotEmpty() | ||
| } | ||
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| override fun randomValues(random: Random): List<FuzzedValue>? { | ||
| return values.values.elementAtOrNull(randomIndex(random)) | ||
| } | ||
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| private fun randomIndex(random: Random): Int { | ||
| val frequencies = DoubleArray(values.size).also { f -> | ||
| values.keys.forEachIndexed { index, key -> | ||
| f[index] = 1 / key.count.toDouble().pow(2) | ||
| } | ||
| } | ||
| return random.chooseOne(frequencies) | ||
| } | ||
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| override fun get(seed: Trie.Node<V>): List<FuzzedValue>? { | ||
| return values[seed] | ||
| } | ||
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| override fun executions(seed: Trie.Node<V>): Int { | ||
| return seed.count | ||
| } | ||
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| } |
46 changes: 46 additions & 0 deletions
46
utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/ModelMutator.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| package org.utbot.fuzzer | ||
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| import org.utbot.framework.plugin.api.UtModel | ||
| import kotlin.random.Random | ||
|
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| /** | ||
| * Mutates values and returns it. | ||
| */ | ||
| interface ModelMutator { | ||
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| /** | ||
| * Mutates values set. | ||
| * | ||
| * Default implementation iterates through values and delegates to `mutate(FuzzedMethodDescription, Int, Random)`. | ||
| */ | ||
| fun mutate( | ||
| description: FuzzedMethodDescription, | ||
| parameters: List<FuzzedValue>, | ||
| random: Random, | ||
| ) : List<FuzzedParameter> { | ||
| return parameters | ||
| .asSequence() | ||
| .mapIndexedNotNull { index, fuzzedValue -> | ||
| mutate(description, index, fuzzedValue, random)?.let { mutated -> | ||
| FuzzedParameter(index, mutated) | ||
| } | ||
| } | ||
| .toList() | ||
| } | ||
|
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| /** | ||
| * Mutate a single value if it is possible. | ||
| */ | ||
| fun mutate( | ||
| description: FuzzedMethodDescription, | ||
| index: Int, | ||
| value: FuzzedValue, | ||
| random: Random | ||
| ) : FuzzedValue? { | ||
| return null | ||
| } | ||
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| fun UtModel.mutatedFrom(template: FuzzedValue, block: FuzzedValue.() -> Unit = {}): FuzzedValue { | ||
| return FuzzedValue(this, template.createdBy).apply(block) | ||
| } | ||
| } |
36 changes: 36 additions & 0 deletions
36
utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/RandomExtensions.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| package org.utbot.fuzzer | ||
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| import kotlin.random.Random | ||
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| /** | ||
| * Chooses a random value using frequencies. | ||
| * | ||
| * If value has greater frequency value then it would be chosen with greater probability. | ||
| * | ||
| * @return the index of the chosen item. | ||
| */ | ||
| fun Random.chooseOne(frequencies: DoubleArray): Int { | ||
| val total = frequencies.sum() | ||
| val value = nextDouble(total) | ||
| var nextBound = 0.0 | ||
| frequencies.forEachIndexed { index, bound -> | ||
| check(bound >= 0) { "Frequency must not be negative" } | ||
| nextBound += bound | ||
| if (value < nextBound) return index | ||
| } | ||
| error("Cannot find next index") | ||
| } | ||
|
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| /** | ||
| * Tries a value. | ||
| * | ||
| * If a random value is less than [probability] returns true. | ||
| */ | ||
| fun Random.flipCoin(probability: Int): Boolean { | ||
| check(probability in 0 .. 100) { "probability must in range [0, 100] but $probability is provided" } | ||
| return nextInt(1, 101) <= probability | ||
| } | ||
|
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| fun Long.invertBit(bitIndex: Int): Long { | ||
| return this xor (1L shl bitIndex) | ||
| } | ||
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Perhaps, is frequencies could be a big array, we can create a custom collection for such frequencies that knowns information about its elements, such as total sum, statistics and other