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// Copyright 2020 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 compiler
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
"github.com/google/syzkaller/pkg/ast"
)
// ConstFile serializes/deserializes .const files.
type ConstFile struct {
arches map[string]bool
m map[string]constVal
}
type constVal struct {
name string
vals map[string]uint64 // arch -> value
}
const undefined = "???"
func NewConstFile() *ConstFile {
return &ConstFile{
arches: make(map[string]bool),
m: make(map[string]constVal),
}
}
func (cf *ConstFile) AddArch(arch string, consts map[string]uint64, undeclared map[string]bool) error {
cf.arches[arch] = true
for name, val := range consts {
if err := cf.addConst(arch, name, val, true); err != nil {
return err
}
}
for name := range undeclared {
if err := cf.addConst(arch, name, 0, false); err != nil {
return err
}
}
return nil
}
func (cf *ConstFile) addConst(arch, name string, val uint64, declared bool) error {
cv := cf.m[name]
if cv.vals == nil {
cv.name = name
cv.vals = make(map[string]uint64)
}
if val0, declared0 := cv.vals[arch]; declared && declared0 && val != val0 {
return fmt.Errorf("const=%v arch=%v has different values: %v[%v] vs %v[%v]",
name, arch, val, declared, val0, declared0)
}
if declared {
cv.vals[arch] = val
}
cf.m[name] = cv
return nil
}
func (cf *ConstFile) Arch(arch string) map[string]uint64 {
if cf == nil {
return nil
}
m := make(map[string]uint64)
for name, cv := range cf.m {
if v, ok := cv.vals[arch]; ok {
m[name] = v
}
}
return m
}
func (cf *ConstFile) Serialize() []byte {
if len(cf.arches) == 0 {
return nil
}
var arches []string
for arch := range cf.arches {
arches = append(arches, arch)
}
sort.Strings(arches)
var consts []constVal
for _, cv := range cf.m {
consts = append(consts, cv)
}
sort.Slice(consts, func(i, j int) bool {
return consts[i].name < consts[j].name
})
buf := new(bytes.Buffer)
fmt.Fprintf(buf, "# Code generated by syz-sysgen. DO NOT EDIT.\n")
fmt.Fprintf(buf, "arches = %v\n", strings.Join(arches, ", "))
for _, cv := range consts {
fmt.Fprintf(buf, "%v = ", cv.name)
if len(cv.vals) == 0 {
// Undefined for all arches.
fmt.Fprintf(buf, "%v\n", undefined)
continue
}
count := make(map[uint64]int)
max, dflt := 0, uint64(0)
for _, val := range cv.vals {
count[val]++
if count[val] > 1 && (count[val] > max || count[val] == max && val < dflt) {
max, dflt = count[val], val
}
}
if max != 0 {
// Have a default value.
fmt.Fprintf(buf, "%v", dflt)
}
handled := make([]bool, len(arches))
for i, arch := range arches {
val, ok := cv.vals[arch]
if ok && (max != 0 && val == dflt) || handled[i] {
// Default value or serialized on a previous iteration.
continue
}
if i != 0 || max != 0 {
fmt.Fprintf(buf, ", ")
}
fmt.Fprintf(buf, "%v:", arch)
for j := i + 1; j < len(arches); j++ {
// Add more arches with the same value.
arch1 := arches[j]
val1, ok1 := cv.vals[arch1]
if ok1 == ok && val1 == val {
fmt.Fprintf(buf, "%v:", arch1)
handled[j] = true
}
}
if ok {
fmt.Fprintf(buf, "%v", val)
} else {
fmt.Fprint(buf, undefined)
}
}
fmt.Fprintf(buf, "\n")
}
return buf.Bytes()
}
func DeserializeConstFile(glob string, eh ast.ErrorHandler) *ConstFile {
if eh == nil {
eh = ast.LoggingHandler
}
files, err := filepath.Glob(glob)
if err != nil {
eh(ast.Pos{}, fmt.Sprintf("failed to find const files: %v", err))
return nil
}
if len(files) == 0 {
eh(ast.Pos{}, fmt.Sprintf("no const files matched by glob %q", glob))
return nil
}
cf := NewConstFile()
oldFormat := regexp.MustCompile(`_([a-z0-9]+)\.const$`)
for _, f := range files {
data, err := ioutil.ReadFile(f)
if err != nil {
eh(ast.Pos{}, fmt.Sprintf("failed to read const file: %v", err))
return nil
}
// Support for old per-arch format.
// Remove it once we don't have any *_arch.const files anymore.
arch := ""
if match := oldFormat.FindStringSubmatch(f); match != nil {
arch = match[1]
}
if !cf.deserializeFile(data, filepath.Base(f), arch, eh) {
return nil
}
}
return cf
}
func (cf *ConstFile) deserializeFile(data []byte, file, arch string, eh ast.ErrorHandler) bool {
pos := ast.Pos{File: file, Line: 1}
errf := func(msg string, args ...interface{}) bool {
eh(pos, fmt.Sprintf(msg, args...))
return false
}
s := bufio.NewScanner(bytes.NewReader(data))
var arches []string
for ; s.Scan(); pos.Line++ {
line := s.Text()
if line == "" || line[0] == '#' {
continue
}
eq := strings.IndexByte(line, '=')
if eq == -1 {
return errf("expect '='")
}
name, val := strings.TrimSpace(line[:eq]), strings.TrimSpace(line[eq+1:])
if arch != "" {
// Old format.
if !cf.parseOldConst(arch, name, val, errf) {
return false
}
continue
}
if arch == "" && len(arches) == 0 {
if name != "arches" {
return errf("missing arches header")
}
for _, arch := range strings.Split(val, ",") {
arches = append(arches, strings.TrimSpace(arch))
}
continue
}
if !cf.parseConst(arches, name, val, errf) {
return false
}
}
if err := s.Err(); err != nil {
return errf("failed to parse: %v", err)
}
return true
}
type errft func(msg string, args ...interface{}) bool
func (cf *ConstFile) parseConst(arches []string, name, line string, errf errft) bool {
var dflt map[string]uint64
for _, pair := range strings.Split(line, ",") {
fields := strings.Split(pair, ":")
if len(fields) == 1 {
// Default value.
if dflt != nil {
return errf("duplicate default value")
}
dflt = make(map[string]uint64)
valStr := strings.TrimSpace(fields[0])
if valStr == undefined {
continue
}
val, err := strconv.ParseUint(valStr, 0, 64)
if err != nil {
return errf("failed to parse int: %v", err)
}
for _, arch := range arches {
dflt[arch] = val
}
continue
}
if len(fields) < 2 {
return errf("bad value: %v", pair)
}
valStr := strings.TrimSpace(fields[len(fields)-1])
defined := valStr != undefined
var val uint64
if defined {
var err error
if val, err = strconv.ParseUint(valStr, 0, 64); err != nil {
return errf("failed to parse int: %v", err)
}
}
for _, arch := range fields[:len(fields)-1] {
arch = strings.TrimSpace(arch)
delete(dflt, arch)
if err := cf.addConst(arch, name, val, defined); err != nil {
return errf("%v", err)
}
}
}
for arch, val := range dflt {
if err := cf.addConst(arch, name, val, true); err != nil {
return errf("%v", err)
}
}
return true
}
func (cf *ConstFile) parseOldConst(arch, name, line string, errf errft) bool {
val, err := strconv.ParseUint(strings.TrimSpace(line), 0, 64)
if err != nil {
return errf("failed to parse int: %v", err)
}
if err := cf.addConst(arch, name, val, true); err != nil {
return errf("%v", err)
}
return true
}
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