Update to wasm-tools 239

Cargo.toml

@@ -33,13 +33,13 @@ prettyplease = "0.2.20"
 syn = { version = "2.0.89", features = ["printing"] }
 futures = "0.3.31"
 
-wat = "1.238.0"
-wasmparser = "0.238.0"
-wasm-encoder = "0.238.0"
-wasm-metadata = { version = "0.238.0", default-features = false }
-wit-parser = "0.238.0"
-wit-component = "0.238.0"
-wasm-compose = "0.238.0"
+wat = "1.239.0"
+wasmparser = "0.239.0"
+wasm-encoder = "0.239.0"
+wasm-metadata = { version = "0.239.0", default-features = false }
+wit-parser = "0.239.0"
+wit-component = "0.239.0"
+wasm-compose = "0.239.0"
 
 wit-bindgen-core = { path = 'crates/core', version = '0.45.1' }
 wit-bindgen-c = { path = 'crates/c', version = '0.45.1' }
@@ -89,3 +89,4 @@ csharp = ['dep:wit-bindgen-csharp']
 csharp-mono = ['csharp']
 moonbit = ['dep:wit-bindgen-moonbit']
 async = []
+

crates/c/src/lib.rs

@@ -757,6 +757,8 @@ typedef enum {snake}_waitable_state {{
 }} {snake}_waitable_state_t;
 
 void {snake}_backpressure_set(bool enable);
+void {snake}_backpressure_inc(void);
+void {snake}_backpressure_dec(void);
 void* {snake}_context_get(void);
 void {snake}_context_set(void*);
             "
@@ -826,6 +828,20 @@ void {snake}_backpressure_set(bool enable) {{
     __backpressure_set(enable);
 }}
 
+__attribute__((__import_module__("$root"), __import_name__("[backpressure-inc]")))
+extern void __backpressure_inc(void);
+
+void {snake}_backpressure_inc(void) {{
+    __backpressure_inc();
+}}
+
+__attribute__((__import_module__("$root"), __import_name__("[backpressure-dec]")))
+extern void __backpressure_dec(void);
+
+void {snake}_backpressure_dec(void) {{
+    __backpressure_dec();
+}}
+
 __attribute__((__import_module__("$root"), __import_name__("[context-get-0]")))
 extern void* __context_get(void);
 

crates/guest-rust/src/lib.rs

@@ -874,7 +874,8 @@ pub mod rt;
 
 #[cfg(feature = "async")]
 pub use rt::async_support::{
-    backpressure_set, block_on, spawn, yield_async, yield_blocking, AbiBuffer, FutureRead,
-    FutureReader, FutureWrite, FutureWriteCancel, FutureWriteError, FutureWriter, StreamRead,
-    StreamReader, StreamResult, StreamWrite, StreamWriter,
+    backpressure_dec, backpressure_inc, backpressure_set, block_on, spawn, yield_async,
+    yield_blocking, AbiBuffer, FutureRead, FutureReader, FutureWrite, FutureWriteCancel,
+    FutureWriteError, FutureWriter, StreamRead, StreamReader, StreamResult, StreamWrite,
+    StreamWriter,
 };

crates/guest-rust/src/rt/async_support.rs

@@ -515,6 +515,7 @@ pub async fn yield_async() {
 /// When `enabled` is `true`, this tells the host to defer any new calls to this
 /// component instance until further notice (i.e. until `backpressure.set` is
 /// called again with `enabled` set to `false`).
+#[deprecated = "use backpressure_{inc,dec} instead"]
 pub fn backpressure_set(enabled: bool) {
     #[cfg(not(target_arch = "wasm32"))]
     unsafe fn backpressure_set(_: i32) {
@@ -531,6 +532,40 @@ pub fn backpressure_set(enabled: bool) {
     unsafe { backpressure_set(if enabled { 1 } else { 0 }) }
 }
 
+/// Call the `backpressure.inc` canonical built-in function.
+pub fn backpressure_inc() {
+    #[cfg(not(target_arch = "wasm32"))]
+    unsafe fn backpressure_inc() {
+        unreachable!();
+    }
+
+    #[cfg(target_arch = "wasm32")]
+    #[link(wasm_import_module = "$root")]
+    extern "C" {
+        #[link_name = "[backpressure-inc]"]
+        fn backpressure_inc();
+    }
+
+    unsafe { backpressure_inc() }
+}
+
+/// Call the `backpressure.dec` canonical built-in function.
+pub fn backpressure_dec() {
+    #[cfg(not(target_arch = "wasm32"))]
+    unsafe fn backpressure_dec() {
+        unreachable!();
+    }
+
+    #[cfg(target_arch = "wasm32")]
+    #[link(wasm_import_module = "$root")]
+    extern "C" {
+        #[link_name = "[backpressure-dec]"]
+        fn backpressure_dec();
+    }
+
+    unsafe { backpressure_dec() }
+}
+
 fn context_get() -> *mut u8 {
     #[cfg(not(target_arch = "wasm32"))]
     unsafe fn get() -> *mut u8 {

tests/runtime-async/async/cancel-import/test.rs

@@ -12,6 +12,7 @@ impl crate::exports::my::test::i::Guest for Component {
     }
 
     fn backpressure_set(x: bool) {
-        wit_bindgen::backpressure_set(x)
+        #[expect(deprecated)]
+        return wit_bindgen::backpressure_set(x);
     }
 }