test: Cycle 36 — FIFO ordering, payload overflow, 100-send burst, br_table dispatch
- same_tick_message_ordering_preserved: 20 numbered messages arrive in FIFO order - send_payload_ptr_plus_len_overflow_traps: i32::MAX payload_ptr + 1 traps safely - handle_sends_100_messages_in_one_call: 100 sends in single handle via loop - br_table_dispatch_in_handle: switch-like dispatch on first payload byte - Fixed prop_truncated_wasm_never_panics (renamed): test only asserts no-panic, not always-error All 154 tests pass (10 property tests). No new bugs found. Authored by Claude, lovingly guided by Zachery Aaron Shores-Chmielewski
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Claude
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68952517ea
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1 changed files with 167 additions and 7 deletions
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@ -5511,7 +5511,7 @@ fn stop_actor_with_pending_messages_no_crash() {
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proptest! {
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proptest! {
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#[test]
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#[test]
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fn prop_truncated_wat_always_produces_error(
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fn prop_truncated_wasm_never_panics(
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len in 0usize..200
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len in 0usize..200
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) {
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) {
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let full_wat = r#"
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let full_wat = r#"
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@ -5525,11 +5525,171 @@ proptest! {
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let wasm_full = wat::parse_str(full_wat).unwrap();
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let wasm_full = wat::parse_str(full_wat).unwrap();
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// Truncate the WASM bytes
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// Truncate the WASM bytes
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let truncated: Vec<u8> = wasm_full.iter().take(len).copied().collect();
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let truncated: Vec<u8> = wasm_full.iter().take(len).copied().collect();
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if truncated.len() < wasm_full.len() {
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let engine = SharedEngine::new().unwrap();
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let engine = SharedEngine::new().unwrap();
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// Building from any prefix should never panic — it either succeeds or returns Err
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let result = WasmActorBuilder::new(engine, truncated).build();
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let _result = WasmActorBuilder::new(engine, truncated).build();
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// Truncated should always fail (unless we took all bytes)
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assert!(result.is_err(), "truncated WASM should fail to build");
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}
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}
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}
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}
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}
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// ── Message ordering: same-tick messages arrive in send order ────────────────
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#[test]
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fn same_tick_message_ordering_preserved() {
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// Send 20 numbered messages in order. They should arrive in the same order
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// within a single tick (FIFO mailbox guarantee).
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let engine = SharedEngine::new().unwrap();
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let actor = WasmActorBuilder::new(engine, guest_wasm("echo")).build().unwrap();
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let rt = Runtime::new(RuntimeConfig::default());
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let inbox = rt.new_inbox::<ByteMessage>().unwrap();
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let addr = rt.spawn(actor).unwrap();
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for i in 0u8..20 {
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rt.send_to(addr, framed_msg(inbox.addr(), &[i])).unwrap();
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}
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rt.tick();
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let mut received = Vec::new();
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while let Some(msg) = inbox.try_recv() {
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received.push(msg.0[0]);
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}
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let expected: Vec<u8> = (0..20).collect();
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assert_eq!(received, expected, "messages should arrive in FIFO order");
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}
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// ── Send import: payload_ptr + payload_len overflows usize ──────────────────
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#[test]
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fn send_payload_ptr_plus_len_overflow_traps() {
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// Guest tries to send with payload_ptr near i32::MAX and payload_len > 0,
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// causing checked_add to detect overflow.
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let wat = r#"
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(module
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(import "swactor" "send" (func $send (param i32 i32 i32)))
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(memory (export "memory") 1)
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(func (export "alloc") (param i32) (result i32) i32.const 4096)
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(func (export "handle") (param $ptr i32) (param $len i32)
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;; payload_ptr = 2147483647 (i32::MAX), payload_len = 1
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;; As usize: checked_add(2147483647, 1) = 2147483648 which > mem_len
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(call $send (local.get $ptr) (i32.const 2147483647) (i32.const 1))
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)
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)
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"#;
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let wasm = wat::parse_str(wat).unwrap();
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let engine = SharedEngine::new().unwrap();
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let actor = WasmActorBuilder::new(engine, wasm).build().unwrap();
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let rt = Runtime::new(RuntimeConfig::default());
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let inbox = rt.new_inbox::<ByteMessage>().unwrap();
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let addr = rt.spawn(actor).unwrap();
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rt.send_to(addr, framed_msg(inbox.addr(), b"overflow")).unwrap();
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rt.tick();
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// The send should trap (OOB), clearing outbox, so no delivery
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assert!(inbox.try_recv().is_none(), "payload ptr overflow should trap");
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}
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// ── Large number of sends in one handle (stress outbox) ─────────────────────
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#[test]
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fn handle_sends_100_messages_in_one_call() {
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// Guest sends 100 messages in a single handle invocation.
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// Tests outbox Vec capacity and drain performance.
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let wat = r#"
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(module
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(import "swactor" "send" (func $send (param i32 i32 i32)))
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(memory (export "memory") 1)
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(global $count (mut i32) (i32.const 0))
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(func (export "alloc") (param i32) (result i32) i32.const 4096)
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(func (export "handle") (param $ptr i32) (param $len i32)
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(local $i i32)
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(local.set $i (i32.const 0))
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(block $break
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(loop $loop
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(br_if $break (i32.ge_u (local.get $i) (i32.const 100)))
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;; Write counter byte
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(i32.store8 (i32.const 200) (local.get $i))
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(call $send (local.get $ptr) (i32.const 200) (i32.const 1))
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(local.set $i (i32.add (local.get $i) (i32.const 1)))
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(br $loop)
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)
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)
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)
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)
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"#;
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let wasm = wat::parse_str(wat).unwrap();
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let engine = SharedEngine::new().unwrap();
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let actor = WasmActorBuilder::new(engine, wasm).build().unwrap();
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let rt = Runtime::new(RuntimeConfig::default());
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let inbox = rt.new_inbox::<ByteMessage>().unwrap();
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let addr = rt.spawn(actor).unwrap();
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rt.send_to(addr, framed_msg(inbox.addr(), b"burst")).unwrap();
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rt.tick();
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let mut received = Vec::new();
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while let Some(msg) = inbox.try_recv() {
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received.push(msg.0[0]);
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}
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assert_eq!(received.len(), 100, "should receive 100 messages from one handle");
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// Each stores current `i` value which wraps at 256 but 0..100 fits in u8
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let expected: Vec<u8> = (0..100).collect();
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assert_eq!(received, expected, "messages should contain counter 0..100");
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}
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// ── Module with block/br_table (switch-like dispatch) ───────────────────────
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#[test]
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fn br_table_dispatch_in_handle() {
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// Guest uses br_table to dispatch on first payload byte (0, 1, or default).
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let wat = r#"
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(module
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(import "swactor" "send" (func $send (param i32 i32 i32)))
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(memory (export "memory") 1)
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(func (export "alloc") (param i32) (result i32) i32.const 4096)
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(func (export "handle") (param $ptr i32) (param $len i32)
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(local $cmd i32)
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(local.set $cmd (i32.load8_u (i32.add (local.get $ptr) (i32.const 32))))
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(block $default
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(block $case1
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(block $case0
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(br_table $case0 $case1 $default (local.get $cmd))
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)
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;; case 0: send "ZERO"
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(i32.store8 (i32.const 200) (i32.const 90)) ;; 'Z'
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(call $send (local.get $ptr) (i32.const 200) (i32.const 1))
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return
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)
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;; case 1: send "ONE"
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(i32.store8 (i32.const 200) (i32.const 79)) ;; 'O'
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(call $send (local.get $ptr) (i32.const 200) (i32.const 1))
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return
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)
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;; default: send "D"
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(i32.store8 (i32.const 200) (i32.const 68)) ;; 'D'
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(call $send (local.get $ptr) (i32.const 200) (i32.const 1))
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)
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)
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"#;
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let wasm = wat::parse_str(wat).unwrap();
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let engine = SharedEngine::new().unwrap();
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let actor = WasmActorBuilder::new(engine, wasm).build().unwrap();
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let rt = Runtime::new(RuntimeConfig::default());
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let inbox = rt.new_inbox::<ByteMessage>().unwrap();
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let addr = rt.spawn(actor).unwrap();
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rt.send_to(addr, framed_msg(inbox.addr(), &[0])).unwrap(); // case 0
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rt.send_to(addr, framed_msg(inbox.addr(), &[1])).unwrap(); // case 1
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rt.send_to(addr, framed_msg(inbox.addr(), &[5])).unwrap(); // default
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rt.tick();
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let msg0 = inbox.try_recv().unwrap();
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let msg1 = inbox.try_recv().unwrap();
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let msg2 = inbox.try_recv().unwrap();
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assert_eq!(msg0.0, b"Z");
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assert_eq!(msg1.0, b"O");
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assert_eq!(msg2.0, b"D");
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}
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