wasmtime: In-process sampling profiler

crates/runtime/src/traphandlers/backtrace.rs

@@ -304,7 +304,9 @@ impl Backtrace {
     }
 
     /// Iterate over the frames inside this backtrace.
-    pub fn frames<'a>(&'a self) -> impl ExactSizeIterator<Item = &'a Frame> + 'a {
+    pub fn frames<'a>(
+        &'a self,
+    ) -> impl ExactSizeIterator<Item = &'a Frame> + DoubleEndedIterator + 'a {
         self.0.iter()
     }
 }

crates/wasi-common/src/snapshots/preview_1.rs

@@ -1355,7 +1355,7 @@ fn dirent_bytes(dirent: types::Dirent) -> Vec<u8> {
     use wiggle::GuestType;
     assert_eq!(
         types::Dirent::guest_size(),
-        std::mem::size_of::<types::Dirent>() as _,
+        std::mem::size_of::<types::Dirent>() as u32,
         "Dirent guest repr and host repr should match"
     );
     assert_eq!(

crates/wasmtime/Cargo.toml

@@ -35,6 +35,7 @@ cfg-if = "1.0"
 log = { workspace = true }
 wat = { workspace = true, optional = true }
 serde = { version = "1.0.94", features = ["derive"] }
+serde_json = { workspace = true }
 bincode = "1.2.1"
 indexmap = "1.6"
 paste = "1.0.3"
@@ -45,6 +46,7 @@ object = { workspace = true }
 async-trait = { workspace = true, optional = true }
 encoding_rs = { version = "0.8.31", optional = true }
 bumpalo = "3.11.0"
+fxprof-processed-profile = "0.6.0"
 
 [target.'cfg(target_os = "windows")'.dependencies.windows-sys]
 workspace = true

crates/wasmtime/src/lib.rs

@@ -399,6 +399,7 @@ mod limits;
 mod linker;
 mod memory;
 mod module;
+mod profiling;
 mod r#ref;
 mod signatures;
 mod store;
@@ -416,6 +417,7 @@ pub use crate::limits::*;
 pub use crate::linker::*;
 pub use crate::memory::*;
 pub use crate::module::Module;
+pub use crate::profiling::GuestProfiler;
 pub use crate::r#ref::ExternRef;
 #[cfg(feature = "async")]
 pub use crate::store::CallHookHandler;