pkg/fuzzer: factor out the fuzzing engine

This is the first step for #1541.

Move the fuzzing engine that used to be interleaved with other syz-fuzzer
code into a separate package.

For now, the algorithm is more or less the same as it was, the only
difference is that a pkg/fuzzer instance scales to the available
computing power.

Add an executor-based test that performs real fuzzing.

1 files changed, 26 insertions, 0 deletions

diff --git a/pkg/fuzzer/stats.go b/pkg/fuzzer/stats.go
new file mode 100644
index 000000000..17bc6131c
--- /dev/null
+++ b/pkg/fuzzer/stats.go
@@ -0,0 +1,26 @@
+// 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
+
+const (
+	statGenerate       = "exec gen"
+	statFuzz           = "exec fuzz"
+	statCandidate      = "exec candidate"
+	statTriage         = "exec triage"
+	statMinimize       = "exec minimize"
+	statSmash          = "exec smash"
+	statHint           = "exec hints"
+	statSeed           = "exec seeds"
+	statCollide        = "exec collide"
+	statExecTotal      = "exec total"
+	statBufferTooSmall = "buffer too small"
+)
+
+func (fuzzer *Fuzzer) GrabStats() map[string]uint64 {
+	fuzzer.mu.Lock()
+	defer fuzzer.mu.Unlock()
+	ret := fuzzer.stats
+	fuzzer.stats = map[string]uint64{}
+	return ret
+}