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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package fuzzer
import (
"sync"
"github.com/google/syzkaller/pkg/signal"
"github.com/google/syzkaller/pkg/stat"
)
// Cover keeps track of the signal known to the fuzzer.
type Cover struct {
mu sync.RWMutex
maxSignal signal.Signal // max signal ever observed (including flakes)
newSignal signal.Signal // newly identified max signal
}
func newCover() *Cover {
cover := new(Cover)
stat.New("max signal", "Maximum fuzzing signal (including flakes)",
stat.Graph("signal"), stat.LenOf(&cover.maxSignal, &cover.mu))
return cover
}
func (cover *Cover) addRawMaxSignal(signal []uint64, prio uint8) signal.Signal {
cover.mu.Lock()
defer cover.mu.Unlock()
diff := cover.maxSignal.DiffRaw(signal, prio)
if diff.Empty() {
return diff
}
cover.maxSignal.Merge(diff)
cover.newSignal.Merge(diff)
return diff
}
func (cover *Cover) CopyMaxSignal() signal.Signal {
cover.mu.RLock()
defer cover.mu.RUnlock()
return cover.maxSignal.Copy()
}
func (cover *Cover) GrabSignalDelta() signal.Signal {
cover.mu.Lock()
defer cover.mu.Unlock()
plus := cover.newSignal
cover.newSignal = nil
return plus
}
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