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// +build gofuzz
/*
# Instructions for smat testing for roaring
[smat](https://github.com/mschoch/smat) is a framework that provides
state machine assisted fuzz testing.
To run the smat tests for roaring...
## Prerequisites
$ go get github.com/dvyukov/go-fuzz/go-fuzz
$ go get github.com/dvyukov/go-fuzz/go-fuzz-build
## Steps
1. Generate initial smat corpus:
```
go test -tags=gofuzz -run=TestGenerateSmatCorpus
```
2. Build go-fuzz test program with instrumentation:
```
go-fuzz-build -func FuzzSmat github.com/RoaringBitmap/roaring
```
3. Run go-fuzz:
```
go-fuzz -bin=./roaring-fuzz.zip -workdir=workdir/ -timeout=200
```
You should see output like...
```
2016/09/16 13:58:35 slaves: 8, corpus: 1 (3s ago), crashers: 0, restarts: 1/0, execs: 0 (0/sec), cover: 0, uptime: 3s
2016/09/16 13:58:38 slaves: 8, corpus: 1 (6s ago), crashers: 0, restarts: 1/0, execs: 0 (0/sec), cover: 0, uptime: 6s
2016/09/16 13:58:41 slaves: 8, corpus: 1 (9s ago), crashers: 0, restarts: 1/44, execs: 44 (5/sec), cover: 0, uptime: 9s
2016/09/16 13:58:44 slaves: 8, corpus: 1 (12s ago), crashers: 0, restarts: 1/45, execs: 45 (4/sec), cover: 0, uptime: 12s
2016/09/16 13:58:47 slaves: 8, corpus: 1 (15s ago), crashers: 0, restarts: 1/46, execs: 46 (3/sec), cover: 0, uptime: 15s
2016/09/16 13:58:50 slaves: 8, corpus: 1 (18s ago), crashers: 0, restarts: 1/47, execs: 47 (3/sec), cover: 0, uptime: 18s
2016/09/16 13:58:53 slaves: 8, corpus: 1 (21s ago), crashers: 0, restarts: 1/63, execs: 63 (3/sec), cover: 0, uptime: 21s
2016/09/16 13:58:56 slaves: 8, corpus: 1 (24s ago), crashers: 0, restarts: 1/65, execs: 65 (3/sec), cover: 0, uptime: 24s
2016/09/16 13:58:59 slaves: 8, corpus: 1 (27s ago), crashers: 0, restarts: 1/66, execs: 66 (2/sec), cover: 0, uptime: 27s
2016/09/16 13:59:02 slaves: 8, corpus: 1 (30s ago), crashers: 0, restarts: 1/67, execs: 67 (2/sec), cover: 0, uptime: 30s
2016/09/16 13:59:05 slaves: 8, corpus: 1 (33s ago), crashers: 0, restarts: 1/83, execs: 83 (3/sec), cover: 0, uptime: 33s
2016/09/16 13:59:08 slaves: 8, corpus: 1 (36s ago), crashers: 0, restarts: 1/84, execs: 84 (2/sec), cover: 0, uptime: 36s
2016/09/16 13:59:11 slaves: 8, corpus: 2 (0s ago), crashers: 0, restarts: 1/85, execs: 85 (2/sec), cover: 0, uptime: 39s
2016/09/16 13:59:14 slaves: 8, corpus: 17 (2s ago), crashers: 0, restarts: 1/86, execs: 86 (2/sec), cover: 480, uptime: 42s
2016/09/16 13:59:17 slaves: 8, corpus: 17 (5s ago), crashers: 0, restarts: 1/66, execs: 132 (3/sec), cover: 487, uptime: 45s
2016/09/16 13:59:20 slaves: 8, corpus: 17 (8s ago), crashers: 0, restarts: 1/440, execs: 2645 (55/sec), cover: 487, uptime: 48s
```
Let it run, and if the # of crashers is > 0, check out the reports in
the workdir where you should be able to find the panic goroutine stack
traces.
*/
package roaring
import (
"fmt"
"sort"
"github.com/mschoch/smat"
"github.com/willf/bitset"
)
// fuzz test using state machine driven by byte stream.
func FuzzSmat(data []byte) int {
return smat.Fuzz(&smatContext{}, smat.ActionID('S'), smat.ActionID('T'),
smatActionMap, data)
}
var smatDebug = false
func smatLog(prefix, format string, args ...interface{}) {
if smatDebug {
fmt.Print(prefix)
fmt.Printf(format, args...)
}
}
type smatContext struct {
pairs []*smatPair
// Two registers, x & y.
x int
y int
actions int
}
type smatPair struct {
bm *Bitmap
bs *bitset.BitSet
}
// ------------------------------------------------------------------
var smatActionMap = smat.ActionMap{
smat.ActionID('X'): smatAction("x++", smatWrap(func(c *smatContext) { c.x++ })),
smat.ActionID('x'): smatAction("x--", smatWrap(func(c *smatContext) { c.x-- })),
smat.ActionID('Y'): smatAction("y++", smatWrap(func(c *smatContext) { c.y++ })),
smat.ActionID('y'): smatAction("y--", smatWrap(func(c *smatContext) { c.y-- })),
smat.ActionID('*'): smatAction("x*y", smatWrap(func(c *smatContext) { c.x = c.x * c.y })),
smat.ActionID('<'): smatAction("x<<", smatWrap(func(c *smatContext) { c.x = c.x << 1 })),
smat.ActionID('^'): smatAction("swap", smatWrap(func(c *smatContext) { c.x, c.y = c.y, c.x })),
smat.ActionID('['): smatAction(" pushPair", smatWrap(smatPushPair)),
smat.ActionID(']'): smatAction(" popPair", smatWrap(smatPopPair)),
smat.ActionID('B'): smatAction(" setBit", smatWrap(smatSetBit)),
smat.ActionID('b'): smatAction(" removeBit", smatWrap(smatRemoveBit)),
smat.ActionID('o'): smatAction(" or", smatWrap(smatOr)),
smat.ActionID('a'): smatAction(" and", smatWrap(smatAnd)),
smat.ActionID('#'): smatAction(" cardinality", smatWrap(smatCardinality)),
smat.ActionID('O'): smatAction(" orCardinality", smatWrap(smatOrCardinality)),
smat.ActionID('A'): smatAction(" andCardinality", smatWrap(smatAndCardinality)),
smat.ActionID('c'): smatAction(" clear", smatWrap(smatClear)),
smat.ActionID('r'): smatAction(" runOptimize", smatWrap(smatRunOptimize)),
smat.ActionID('e'): smatAction(" isEmpty", smatWrap(smatIsEmpty)),
smat.ActionID('i'): smatAction(" intersects", smatWrap(smatIntersects)),
smat.ActionID('f'): smatAction(" flip", smatWrap(smatFlip)),
smat.ActionID('-'): smatAction(" difference", smatWrap(smatDifference)),
}
var smatRunningPercentActions []smat.PercentAction
func init() {
var ids []int
for actionId := range smatActionMap {
ids = append(ids, int(actionId))
}
sort.Ints(ids)
pct := 100 / len(smatActionMap)
for _, actionId := range ids {
smatRunningPercentActions = append(smatRunningPercentActions,
smat.PercentAction{pct, smat.ActionID(actionId)})
}
smatActionMap[smat.ActionID('S')] = smatAction("SETUP", smatSetupFunc)
smatActionMap[smat.ActionID('T')] = smatAction("TEARDOWN", smatTeardownFunc)
}
// We only have one smat state: running.
func smatRunning(next byte) smat.ActionID {
return smat.PercentExecute(next, smatRunningPercentActions...)
}
func smatAction(name string, f func(ctx smat.Context) (smat.State, error)) func(smat.Context) (smat.State, error) {
return func(ctx smat.Context) (smat.State, error) {
c := ctx.(*smatContext)
c.actions++
smatLog(" ", "%s\n", name)
return f(ctx)
}
}
// Creates an smat action func based on a simple callback.
func smatWrap(cb func(c *smatContext)) func(smat.Context) (next smat.State, err error) {
return func(ctx smat.Context) (next smat.State, err error) {
c := ctx.(*smatContext)
cb(c)
return smatRunning, nil
}
}
// Invokes a callback function with the input v bounded to len(c.pairs).
func (c *smatContext) withPair(v int, cb func(*smatPair)) {
if len(c.pairs) > 0 {
if v < 0 {
v = -v
}
v = v % len(c.pairs)
cb(c.pairs[v])
}
}
// ------------------------------------------------------------------
func smatSetupFunc(ctx smat.Context) (next smat.State, err error) {
return smatRunning, nil
}
func smatTeardownFunc(ctx smat.Context) (next smat.State, err error) {
return nil, err
}
// ------------------------------------------------------------------
func smatPushPair(c *smatContext) {
c.pairs = append(c.pairs, &smatPair{
bm: NewBitmap(),
bs: bitset.New(100),
})
}
func smatPopPair(c *smatContext) {
if len(c.pairs) > 0 {
c.pairs = c.pairs[0 : len(c.pairs)-1]
}
}
func smatSetBit(c *smatContext) {
c.withPair(c.x, func(p *smatPair) {
y := uint32(c.y)
p.bm.AddInt(int(y))
p.bs.Set(uint(y))
p.checkEquals()
})
}
func smatRemoveBit(c *smatContext) {
c.withPair(c.x, func(p *smatPair) {
y := uint32(c.y)
p.bm.Remove(y)
p.bs.Clear(uint(y))
p.checkEquals()
})
}
func smatAnd(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c.withPair(c.y, func(py *smatPair) {
px.bm.And(py.bm)
px.bs = px.bs.Intersection(py.bs)
px.checkEquals()
py.checkEquals()
})
})
}
func smatOr(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c.withPair(c.y, func(py *smatPair) {
px.bm.Or(py.bm)
px.bs = px.bs.Union(py.bs)
px.checkEquals()
py.checkEquals()
})
})
}
func smatAndCardinality(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c.withPair(c.y, func(py *smatPair) {
c0 := px.bm.AndCardinality(py.bm)
c1 := px.bs.IntersectionCardinality(py.bs)
if c0 != uint64(c1) {
panic("expected same add cardinality")
}
px.checkEquals()
py.checkEquals()
})
})
}
func smatOrCardinality(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c.withPair(c.y, func(py *smatPair) {
c0 := px.bm.OrCardinality(py.bm)
c1 := px.bs.UnionCardinality(py.bs)
if c0 != uint64(c1) {
panic("expected same or cardinality")
}
px.checkEquals()
py.checkEquals()
})
})
}
func smatRunOptimize(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
px.bm.RunOptimize()
px.checkEquals()
})
}
func smatClear(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
px.bm.Clear()
px.bs = px.bs.ClearAll()
px.checkEquals()
})
}
func smatCardinality(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c0 := px.bm.GetCardinality()
c1 := px.bs.Count()
if c0 != uint64(c1) {
panic("expected same cardinality")
}
})
}
func smatIsEmpty(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c0 := px.bm.IsEmpty()
c1 := px.bs.None()
if c0 != c1 {
panic("expected same is empty")
}
})
}
func smatIntersects(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c.withPair(c.y, func(py *smatPair) {
v0 := px.bm.Intersects(py.bm)
v1 := px.bs.IntersectionCardinality(py.bs) > 0
if v0 != v1 {
panic("intersects not equal")
}
px.checkEquals()
py.checkEquals()
})
})
}
func smatFlip(c *smatContext) {
c.withPair(c.x, func(p *smatPair) {
y := uint32(c.y)
p.bm.Flip(uint64(y), uint64(y)+1)
p.bs = p.bs.Flip(uint(y))
p.checkEquals()
})
}
func smatDifference(c *smatContext) {
c.withPair(c.x, func(px *smatPair) {
c.withPair(c.y, func(py *smatPair) {
px.bm.AndNot(py.bm)
px.bs = px.bs.Difference(py.bs)
px.checkEquals()
py.checkEquals()
})
})
}
func (p *smatPair) checkEquals() {
if !p.equalsBitSet(p.bs, p.bm) {
panic("bitset mismatch")
}
}
func (p *smatPair) equalsBitSet(a *bitset.BitSet, b *Bitmap) bool {
for i, e := a.NextSet(0); e; i, e = a.NextSet(i + 1) {
if !b.ContainsInt(int(i)) {
fmt.Printf("in a bitset, not b bitmap, i: %d\n", i)
fmt.Printf(" a bitset: %s\n b bitmap: %s\n",
a.String(), b.String())
return false
}
}
i := b.Iterator()
for i.HasNext() {
v := i.Next()
if !a.Test(uint(v)) {
fmt.Printf("in b bitmap, not a bitset, v: %d\n", v)
fmt.Printf(" a bitset: %s\n b bitmap: %s\n",
a.String(), b.String())
return false
}
}
return true
}
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