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// Copyright 2021 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 main
import (
"fmt"
"sort"
"strings"
"time"
"github.com/google/syzkaller/prog"
)
// Stats encapsulates data for creating statistics related to the results
// of the verification process.
type Stats struct {
// Calls stores statistics for all supported system calls.
Calls map[string]*CallStats
TotalMismatches int
TotalProgs int
FlakyProgs int
MismatchingProgs int
StartTime time.Time
}
// CallStats stores information used to generate statistics for the
// system call.
type CallStats struct {
// Name is the system call name.
Name string
// Mismatches stores the number of errno mismatches identified in the
// verified programs for this system call.
Mismatches int
// Occurrences is the number of times the system call appeared in a
// verified program.
Occurrences int
// States stores the kernel return state that caused mismatches.
States map[ReturnState]bool
}
// InitStats creates a stats object.
func InitStats(calls map[*prog.Syscall]bool) *Stats {
stats := &Stats{
Calls: make(map[string]*CallStats),
StartTime: time.Now(),
}
for syscall := range calls {
stats.Calls[syscall.Name] = &CallStats{
Name: syscall.Name,
States: make(map[ReturnState]bool)}
}
return stats
}
// ReportGlobalStats creates a report with statistics about all the
// supported system calls for which errno mismatches were identified in
// the verified programs, shown in decreasing order.
func (stats *Stats) GetTextDescription(deltaTime float64) string {
var result strings.Builder
tc := stats.totalCallsExecuted()
fmt.Fprintf(&result, "total number of mismatches / total number of calls "+
"executed: %d / %d (%0.2f %%)\n\n", stats.TotalMismatches, tc, getPercentage(stats.TotalMismatches, tc))
fmt.Fprintf(&result, "programs / minute: %0.2f\n\n", float64(stats.TotalProgs)/deltaTime)
fmt.Fprintf(&result, "true mismatching programs: %d / total number of programs: %d (%0.2f %%)\n",
stats.MismatchingProgs, stats.TotalProgs, getPercentage(stats.MismatchingProgs, stats.TotalProgs))
fmt.Fprintf(&result, "flaky programs: %d / total number of programs: %d (%0.2f %%)\n\n",
stats.FlakyProgs, stats.TotalProgs, getPercentage(stats.FlakyProgs, stats.TotalProgs))
cs := stats.getOrderedStats()
for _, c := range cs {
fmt.Fprintf(&result, "%s\n", stats.getCallStatsTextDescription(c.Name))
}
return result.String()
}
// getCallStatsTextDescription creates a report with the current statistics for call.
func (stats *Stats) getCallStatsTextDescription(call string) string {
syscallStat, ok := stats.Calls[call]
if !ok {
return ""
}
syscallName, mismatches, occurrences := syscallStat.Name, syscallStat.Mismatches, syscallStat.Occurrences
return fmt.Sprintf("statistics for %s:\n"+
"\t↳ mismatches of %s / occurrences of %s: %d / %d (%0.2f %%)\n"+
"\t↳ mismatches of %s / total number of mismatches: "+
"%d / %d (%0.2f %%)\n"+
"\t↳ %d distinct states identified: %v\n", syscallName, syscallName, syscallName, mismatches, occurrences,
getPercentage(mismatches, occurrences), syscallName, mismatches, stats.TotalMismatches,
getPercentage(mismatches, stats.TotalMismatches), len(syscallStat.States), stats.getOrderedStates(syscallName))
}
func (stats *Stats) totalCallsExecuted() int {
t := 0
for _, cs := range stats.Calls {
t += cs.Occurrences
}
return t
}
func (stats *Stats) getOrderedStats() []*CallStats {
css := make([]*CallStats, 0)
for _, cs := range stats.Calls {
if cs.Mismatches > 0 {
css = append(css, cs)
}
}
sort.Slice(css, func(i, j int) bool {
return getPercentage(css[i].Mismatches, css[i].Occurrences) > getPercentage(css[j].Mismatches, css[j].Occurrences)
})
return css
}
func (stats *Stats) getOrderedStates(call string) []string {
states := stats.Calls[call].States
ss := make([]string, 0, len(states))
for s := range states {
ss = append(ss, fmt.Sprintf("%q", s))
}
sort.Strings(ss)
return ss
}
func getPercentage(value, total int) float64 {
return float64(value) / float64(total) * 100
}
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