mirror of
https://github.com/SerenityOS/serenity
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a721e4d507
While this clutters Process.cpp a tiny bit, I feel that it's worth it: - 2x speed on the kcov_loop benchmark. Likely more during fuzzing. - Overall code complexity is going down with this change. - By reducing the code reachable from __sanitizer_cov_trace_pc code, we can now instrument more code.
39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/Devices/KCOVInstance.h>
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namespace Kernel {
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class KCOVDevice final : public BlockDevice {
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friend class DeviceManagement;
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public:
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static NonnullLockRefPtr<KCOVDevice> must_create();
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static void free_thread();
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static void free_process();
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// ^File
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ErrorOr<NonnullLockRefPtr<Memory::VMObject>> vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool shared) override;
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virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
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protected:
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KCOVDevice();
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virtual StringView class_name() const override { return "KCOVDevice"sv; }
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virtual bool can_read(OpenFileDescription const&, u64) const override final { return true; }
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virtual bool can_write(OpenFileDescription const&, u64) const override final { return true; }
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virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return EINVAL; }
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virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
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};
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}
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