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| 1 | +//! Parse **backend → GDB** RSP payloads for read-only logging (Phase B). Does not modify packets. |
| 2 | +
|
| 3 | +/// Summarize thread-related **reply** payloads (not `T` stop replies — use [`super::summarize_stop_reply`]). |
| 4 | +pub fn summarize_backend_thread_payload(data: &[u8]) -> Option<String> { |
| 5 | + if data.is_empty() { |
| 6 | + return None; |
| 7 | + } |
| 8 | + // Stop replies are handled separately (may contain binary). |
| 9 | + if data.first() == Some(&b'T') { |
| 10 | + return None; |
| 11 | + } |
| 12 | + |
| 13 | + let s = std::str::from_utf8(data).ok()?; |
| 14 | + |
| 15 | + if s == "l" { |
| 16 | + return Some("thread list: end (l)".to_string()); |
| 17 | + } |
| 18 | + |
| 19 | + if let Some(rest) = s.strip_prefix('m') { |
| 20 | + if rest.is_empty() { |
| 21 | + return Some("thread list: m (empty)".to_string()); |
| 22 | + } |
| 23 | + let n = rest.split(',').filter(|seg| !seg.is_empty()).count(); |
| 24 | + return Some(format!("thread list: {n} id(s)")); |
| 25 | + } |
| 26 | + |
| 27 | + if let Some(rest) = s.strip_prefix("QC") { |
| 28 | + return Some(format!("current thread (qC reply): QC{rest}")); |
| 29 | + } |
| 30 | + |
| 31 | + // qThreadExtraInfo reply: hex-encoded UTF-8 name (ASCII hex digits only). |
| 32 | + if data.len() >= 2 && data.len() % 2 == 0 && data.iter().all(|b| b.is_ascii_hexdigit()) { |
| 33 | + if let Ok(bytes) = hex::decode(data) { |
| 34 | + if let Ok(text) = String::from_utf8(bytes) { |
| 35 | + if text.len() <= 512 { |
| 36 | + return Some(format!("thread extra info (decoded): {text:?}")); |
| 37 | + } |
| 38 | + } |
| 39 | + } |
| 40 | + } |
| 41 | + |
| 42 | + None |
| 43 | +} |
| 44 | + |
| 45 | +#[cfg(test)] |
| 46 | +mod tests { |
| 47 | + use super::*; |
| 48 | + |
| 49 | + #[test] |
| 50 | + fn thread_list_end() { |
| 51 | + assert_eq!( |
| 52 | + summarize_backend_thread_payload(b"l").as_deref(), |
| 53 | + Some("thread list: end (l)") |
| 54 | + ); |
| 55 | + } |
| 56 | + |
| 57 | + #[test] |
| 58 | + fn thread_list_ids() { |
| 59 | + let s = summarize_backend_thread_payload(b"m1,2,a").expect("summary"); |
| 60 | + assert!(s.contains("3 id"), "{s}"); |
| 61 | + } |
| 62 | + |
| 63 | + #[test] |
| 64 | + fn current_thread_qc() { |
| 65 | + let s = summarize_backend_thread_payload(b"QC1").expect("summary"); |
| 66 | + assert!(s.contains("QC1"), "{s}"); |
| 67 | + } |
| 68 | + |
| 69 | + #[test] |
| 70 | + fn thread_name_hex() { |
| 71 | + // "main" as UTF-8 hex: 6d61696e |
| 72 | + let s = summarize_backend_thread_payload(b"6d61696e").expect("summary"); |
| 73 | + assert!(s.contains("main"), "{s}"); |
| 74 | + } |
| 75 | + |
| 76 | + #[test] |
| 77 | + fn t_packet_not_handled_here() { |
| 78 | + assert!(summarize_backend_thread_payload(b"T05").is_none()); |
| 79 | + } |
| 80 | +} |
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