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package generate
import "strings"
type TracepointKind int
const (
KindNone TracepointKind = iota
KindFd
KindOpen
KindPathname
KindName
KindRet
KindFcntl
KindNull
KindDup3
KindOpenByHandleAt
)
type RetClassification string
const (
Unclassified RetClassification = "UNCLASSIFIED"
ReadClassified RetClassification = "READ_CLASSIFIED"
WriteClassified RetClassification = "WRITE_CLASSIFIED"
TransferClassified RetClassification = "TRANSFER_CLASSIFIED"
)
type ClassificationResult struct {
Kind TracepointKind
PathnameField string // for KindPathname: "pathname", "path", "filename", or "name"
}
// ClassifyFormat determines the tracepoint kind for a parsed format section.
// It mirrors the Raku multi-dispatch: name-based ignores take priority,
// then name-only mappings, then each external field is tried in order until
// one matches a name+field or generic field pattern.
func ClassifyFormat(f *Format) ClassificationResult {
if len(f.ExternalFields) == 0 {
return ClassificationResult{Kind: KindNone}
}
if shouldIgnore(f.Name) {
return ClassificationResult{Kind: KindNone}
}
if r, ok := classifyNameOnly(f.Name); ok {
return r
}
for _, field := range f.ExternalFields {
if field.Name == "__syscall_nr" {
continue
}
if r, ok := classifyNameAndField(f.Name, field.Type, field.Name); ok {
return r
}
if r, ok := classifyByField(field.Type, field.Name); ok {
return r
}
}
return ClassificationResult{Kind: KindNone}
}
func shouldIgnore(name string) bool {
prefixIgnores := []string{
"sys_enter_mknod",
"sys_enter_execve",
"sys_enter_accept",
"sys_enter_listen",
"sys_enter_epoll",
}
for _, p := range prefixIgnores {
if strings.HasPrefix(name, p) {
return true
}
}
if strings.HasPrefix(name, "sys_enter_") {
containsIgnores := []string{"recv", "send", "sock", "inotify"}
for _, sub := range containsIgnores {
if strings.Contains(name, sub) {
return true
}
}
}
exactIgnores := map[string]bool{
"sys_enter_bind": true,
"sys_enter_setns": true,
"sys_enter_shutdown": true,
"sys_enter_connect": true,
"sys_enter_fanotify_init": true,
"sys_enter_getpeername": true,
}
return exactIgnores[name]
}
// classifyNameOnly handles tracepoints classified by name alone,
// independent of any field.
func classifyNameOnly(name string) (ClassificationResult, bool) {
switch name {
case "sys_enter_open_by_handle_at":
return ClassificationResult{Kind: KindOpenByHandleAt}, true
case "sys_enter_io_uring_enter":
return ClassificationResult{Kind: KindFd}, true
case "sys_enter_io_uring_register":
return ClassificationResult{Kind: KindFd}, true
case "sys_enter_fcntl":
return ClassificationResult{Kind: KindFcntl}, true
case "sys_enter_syslog":
return ClassificationResult{Kind: KindNull}, true
case "sys_enter_sync":
return ClassificationResult{Kind: KindNull}, true
case "sys_enter_msync":
return ClassificationResult{Kind: KindNull}, true
case "sys_enter_getcwd":
return ClassificationResult{Kind: KindNull}, true
}
if strings.HasPrefix(name, "sys_enter_io_") {
return ClassificationResult{Kind: KindNull}, true
}
return ClassificationResult{}, false
}
// classifyNameAndField handles tracepoints that need both the name and
// a specific field to classify.
func classifyNameAndField(name, fieldType, fieldName string) (ClassificationResult, bool) {
switch name {
case "sys_enter_dup":
if fieldType == "unsigned int" && fieldName == "fildes" {
return ClassificationResult{Kind: KindFd}, true
}
case "sys_enter_dup2":
if fieldType == "unsigned int" && fieldName == "oldfd" {
return ClassificationResult{Kind: KindFd}, true
}
case "sys_enter_dup3":
if fieldType == "unsigned int" && fieldName == "oldfd" {
return ClassificationResult{Kind: KindDup3}, true
}
case "sys_enter_name_to_handle_at":
if fieldType == "const char *" && fieldName == "name" {
return ClassificationResult{Kind: KindPathname, PathnameField: "name"}, true
}
case "sys_enter_copy_file_range":
if isFdType(fieldType) && fieldName == "fd_in" {
return ClassificationResult{Kind: KindFd}, true
}
}
if strings.HasPrefix(name, "sys_enter") &&
strings.Contains(name, "open") &&
fieldType == "const char *" && fieldName == "filename" {
return ClassificationResult{Kind: KindOpen}, true
}
return ClassificationResult{}, false
}
func classifyByField(fieldType, fieldName string) (ClassificationResult, bool) {
switch {
case fieldName == "fd" && isFdType(fieldType):
return ClassificationResult{Kind: KindFd}, true
case fieldType == "const char *" && fieldName == "newname":
return ClassificationResult{Kind: KindName}, true
case fieldType == "const char *" && fieldName == "pathname":
return ClassificationResult{Kind: KindPathname, PathnameField: "pathname"}, true
case fieldType == "const char *" && fieldName == "path":
return ClassificationResult{Kind: KindPathname, PathnameField: "path"}, true
case fieldType == "const char *" && fieldName == "filename":
return ClassificationResult{Kind: KindPathname, PathnameField: "filename"}, true
case fieldType == "long" && fieldName == "ret":
return ClassificationResult{Kind: KindRet}, true
}
return ClassificationResult{}, false
}
func isFdType(t string) bool {
return t == "unsigned int" || t == "unsigned long" || t == "int"
}
// ClassifyRet returns the RetClassification for a syscall exit name.
func ClassifyRet(name string) RetClassification {
syscall := strings.ToLower(strings.TrimPrefix(name, "sys_exit_"))
if c, ok := retClassifications[syscall]; ok {
return c
}
return Unclassified
}
var retClassifications = map[string]RetClassification{
"fgetxattr": ReadClassified,
"flistxattr": ReadClassified,
"getdents": ReadClassified,
"getdents64": ReadClassified,
"getxattr": ReadClassified,
"lgetxattr": ReadClassified,
"listxattr": ReadClassified,
"llistxattr": ReadClassified,
"pread64": ReadClassified,
"preadv": ReadClassified,
"preadv2": ReadClassified,
"process_vm_readv": ReadClassified,
"read": ReadClassified,
"readlink": ReadClassified,
"readlinkat": ReadClassified,
"readv": ReadClassified,
"recvmmsg": ReadClassified,
"recvmsg": ReadClassified,
"recvfrom": ReadClassified,
"syslog": ReadClassified,
"copy_file_range": TransferClassified,
"sendfile64": TransferClassified,
"splice": TransferClassified,
"tee": TransferClassified,
"vmsplice": TransferClassified,
"process_vm_writev": WriteClassified,
"pwrite64": WriteClassified,
"pwritev": WriteClassified,
"pwritev2": WriteClassified,
"sendmmsg": WriteClassified,
"sendmsg": WriteClassified,
"sendto": WriteClassified,
"write": WriteClassified,
"writev": WriteClassified,
}
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