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|
package generate
import (
"bufio"
"fmt"
"io"
"regexp"
"sort"
"strings"
)
var secRe = regexp.MustCompile(`^SEC.*sys_((?:enter|exit)_[a-z_0-9]+)`)
var kindLineRe = regexp.MustCompile(`^(sys_enter_[a-z0-9_]+)\s+is a struct\s+([a-z0-9_]+)(?:.*\(kind=([a-z0-9-]+)\))?\s*$`)
// ExtractTracepoints reads generated C code and extracts tracepoint names from
// SEC annotations, producing the generated_tracepoints.go content.
func ExtractTracepoints(r io.Reader) (string, error) {
return ExtractTracepointsWithKinds(r, strings.NewReader(""))
}
// ExtractTracepointsWithKinds reads generated C code and the
// generated_tracepoints_result.txt metadata to produce
// internal/tracepoints/generated_tracepoints.go.
func ExtractTracepointsWithKinds(cReader io.Reader, kindsReader io.Reader) (string, error) {
tracepoints, err := extractTracepoints(cReader)
if err != nil {
return "", err
}
syscallKinds, err := extractSyscallKinds(kindsReader)
if err != nil {
return "", err
}
return formatTracepointsGo(tracepoints, syscallKinds), nil
}
func extractTracepoints(r io.Reader) ([]string, error) {
scanner := bufio.NewScanner(r)
var tracepoints []string
for scanner.Scan() {
line := scanner.Text()
if m := secRe.FindStringSubmatch(line); m != nil {
tracepoints = append(tracepoints, "sys_"+m[1])
}
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("scanning input: %w", err)
}
return tracepoints, nil
}
func extractSyscallKinds(r io.Reader) (map[string]string, error) {
kinds := make(map[string]string)
if r == nil {
return kinds, nil
}
scanner := bufio.NewScanner(r)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" {
continue
}
m := kindLineRe.FindStringSubmatch(line)
if m == nil {
continue
}
syscall := strings.TrimPrefix(m[1], "sys_enter_")
kind := strings.TrimSpace(m[3])
if kind == "" {
kind = normalizeStructKind(m[2])
}
if kind == "" {
continue
}
kinds[syscall] = kind
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("scan kind metadata: %w", err)
}
return kinds, nil
}
func normalizeStructKind(structName string) string {
base := strings.TrimSuffix(structName, "_event")
switch base {
case "mq_open":
return "mq-open"
case "open_by_handle_at":
return "open-by-handle-at"
case "two_fd":
return "two-fd"
case "epoll_ctl":
return "epoll-ctl"
case "perf_open":
return "perf-open"
default:
return base
}
}
func formatTracepointsGo(tracepoints []string, syscallKinds map[string]string) string {
var b strings.Builder
b.WriteString("// Code generated - don't change manually!\n")
b.WriteString("package tracepoints\n\n")
b.WriteString("var List = []string{\n")
for _, tp := range tracepoints {
fmt.Fprintf(&b, "\t%q,\n", tp)
}
b.WriteString("}\n")
b.WriteString("\n")
b.WriteString("var syscallFamilies = map[string]string{\n")
syscallFamilies := make(map[string]string)
for _, tp := range tracepoints {
syscall := strings.TrimPrefix(tp, "sys_enter_")
syscall = strings.TrimPrefix(syscall, "sys_exit_")
if syscall == "" {
continue
}
if _, ok := syscallFamilies[syscall]; ok {
continue
}
family := ClassifySyscallFamily("sys_enter_" + syscall)
syscallFamilies[syscall] = string(family)
}
familySyscalls := make([]string, 0, len(syscallFamilies))
for syscall := range syscallFamilies {
familySyscalls = append(familySyscalls, syscall)
}
sort.Strings(familySyscalls)
for _, syscall := range familySyscalls {
fmt.Fprintf(&b, "\t%q: %q,\n", syscall, syscallFamilies[syscall])
}
b.WriteString("}\n")
b.WriteString("\n")
b.WriteString("var syscallKinds = map[string]string{\n")
syscalls := make([]string, 0, len(syscallKinds))
for syscall := range syscallKinds {
syscalls = append(syscalls, syscall)
}
sort.Strings(syscalls)
for _, syscall := range syscalls {
fmt.Fprintf(&b, "\t%q: %q,\n", syscall, syscallKinds[syscall])
}
b.WriteString("}\n")
return b.String()
}
|
