File size: 4,224 Bytes
d7a5f2f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | // Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pgo
import (
"bytes"
"encoding/binary"
"fmt"
"reflect"
"strings"
"testing"
)
// equal returns an error if got and want are not equal.
func equal(got, want *Profile) error {
if got.TotalWeight != want.TotalWeight {
return fmt.Errorf("got.TotalWeight %d != want.TotalWeight %d", got.TotalWeight, want.TotalWeight)
}
if !reflect.DeepEqual(got.NamedEdgeMap.ByWeight, want.NamedEdgeMap.ByWeight) {
return fmt.Errorf("got.NamedEdgeMap.ByWeight != want.NamedEdgeMap.ByWeight\ngot = %+v\nwant = %+v", got.NamedEdgeMap.ByWeight, want.NamedEdgeMap.ByWeight)
}
if !reflect.DeepEqual(got.NamedEdgeMap.Weight, want.NamedEdgeMap.Weight) {
return fmt.Errorf("got.NamedEdgeMap.Weight != want.NamedEdgeMap.Weight\ngot = %+v\nwant = %+v", got.NamedEdgeMap.Weight, want.NamedEdgeMap.Weight)
}
return nil
}
func testRoundTrip(t *testing.T, d *Profile) []byte {
var buf bytes.Buffer
n, err := d.WriteTo(&buf)
if err != nil {
t.Fatalf("WriteTo got err %v want nil", err)
}
if n != int64(buf.Len()) {
t.Errorf("WriteTo got n %d want %d", n, int64(buf.Len()))
}
b := buf.Bytes()
got, err := FromSerialized(&buf)
if err != nil {
t.Fatalf("processSerialized got err %v want nil", err)
}
if err := equal(got, d); err != nil {
t.Errorf("processSerialized output does not match input: %v", err)
}
return b
}
func TestEmpty(t *testing.T) {
d := emptyProfile()
b := testRoundTrip(t, d)
// Contents should consist of only a header.
if string(b) != serializationHeader {
t.Errorf("WriteTo got %q want %q", string(b), serializationHeader)
}
}
func TestRoundTrip(t *testing.T) {
d := &Profile{
TotalWeight: 3,
NamedEdgeMap: NamedEdgeMap{
ByWeight: []NamedCallEdge{
{
CallerName: "a",
CalleeName: "b",
CallSiteOffset: 14,
},
{
CallerName: "c",
CalleeName: "d",
CallSiteOffset: 15,
},
},
Weight: map[NamedCallEdge]int64{
{
CallerName: "a",
CalleeName: "b",
CallSiteOffset: 14,
}: 2,
{
CallerName: "c",
CalleeName: "d",
CallSiteOffset: 15,
}: 1,
},
},
}
testRoundTrip(t, d)
}
func constructFuzzProfile(t *testing.T, b []byte) *Profile {
// The fuzzer can't construct an arbitrary structure, so instead we
// consume bytes from b to act as our edge data.
r := bytes.NewReader(b)
consumeString := func() (string, bool) {
// First byte: how many bytes to read for this string? We only
// use a byte to avoid making humongous strings.
length, err := r.ReadByte()
if err != nil {
return "", false
}
if length == 0 {
return "", false
}
b := make([]byte, length)
_, err = r.Read(b)
if err != nil {
return "", false
}
return string(b), true
}
consumeInt64 := func() (int64, bool) {
b := make([]byte, 8)
_, err := r.Read(b)
if err != nil {
return 0, false
}
return int64(binary.LittleEndian.Uint64(b)), true
}
d := emptyProfile()
for {
caller, ok := consumeString()
if !ok {
break
}
if strings.ContainsAny(caller, " \r\n") {
t.Skip("caller contains space or newline")
}
callee, ok := consumeString()
if !ok {
break
}
if strings.ContainsAny(callee, " \r\n") {
t.Skip("callee contains space or newline")
}
line, ok := consumeInt64()
if !ok {
break
}
weight, ok := consumeInt64()
if !ok {
break
}
edge := NamedCallEdge{
CallerName: caller,
CalleeName: callee,
CallSiteOffset: int(line),
}
if _, ok := d.NamedEdgeMap.Weight[edge]; ok {
t.Skip("duplicate edge")
}
d.NamedEdgeMap.Weight[edge] = weight
d.TotalWeight += weight
}
byWeight := make([]NamedCallEdge, 0, len(d.NamedEdgeMap.Weight))
for namedEdge := range d.NamedEdgeMap.Weight {
byWeight = append(byWeight, namedEdge)
}
sortByWeight(byWeight, d.NamedEdgeMap.Weight)
d.NamedEdgeMap.ByWeight = byWeight
return d
}
func FuzzRoundTrip(f *testing.F) {
f.Add([]byte("")) // empty profile
f.Fuzz(func(t *testing.T, b []byte) {
d := constructFuzzProfile(t, b)
testRoundTrip(t, d)
})
}
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