// Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

use crate::FuzzTargetImpl;
use diem_proptest_helpers::ValueGenerator;
use move_binary_format::file_format::CompiledModule;
use proptest::prelude::*;

#[derive(Clone, Debug, Default)]
pub struct CompiledModuleTarget;

impl FuzzTargetImpl for CompiledModuleTarget {
    fn description(&self) -> &'static str {
        "VM CompiledModule (custom deserializer)"
    }

    fn generate(&self, _idx: usize, gen: &mut ValueGenerator) -> Option<Vec<u8>> {
        let value = gen.generate(any_with::<CompiledModule>(16));
        let mut out = vec![];
        value
            .serialize(&mut out)
            .expect("serialization should work");
        Some(out)
    }

    fn fuzz(&self, data: &[u8]) {
        // Errors are OK -- the fuzzer cares about panics and OOMs. Note that
        // `CompiledModule::deserialize` also runs the bounds checker, which is desirable here.
        let _ = CompiledModule::deserialize(data);
    }
}