add feature wasmtime-jitdump

client/executor/wasmtime/Cargo.toml

@@ -26,6 +26,7 @@ sp-core = { version = "4.0.0-dev", path = "../../../primitives/core" }
 sc-allocator = { version = "4.0.0-dev", path = "../../allocator" }
 wasmtime = { version = "0.27.0", default-features = false, features = [
     "cache",
+	"jitdump",
     "parallel-compilation",
 ] }
 

client/executor/wasmtime/src/lib.rs

@@ -16,7 +16,17 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-/// ! Defines a `WasmRuntime` that uses the Wasmtime JIT to execute.
+//! Defines a `WasmRuntime` that uses the Wasmtime JIT to execute.
+//!
+//! You can choose a profiling strategy at runtime with
+//! environment variable `WASMTIME_PROFILING_STRATEGY`:
+//!
+//! | `WASMTIME_PROFILING_STRATEGY` | Effect |
+//! |-------------|-------------------|
+//! | undefined   | No profiling      |
+//! | `"jitdump"` | jitdump profiling |
+//! | other value | error             |
+
 mod host;
 mod imports;
 mod instance_wrapper;

client/executor/wasmtime/src/runtime.rs

@@ -253,6 +253,15 @@ fn common_config(semantics: &Semantics) -> std::result::Result<wasmtime::Config,
 	config.cranelift_opt_level(wasmtime::OptLevel::SpeedAndSize);
 	config.cranelift_nan_canonicalization(semantics.canonicalize_nans);
 
+	let profiler = match std::env::var_os("WASMTIME_PROFILING_STRATEGY") {
+		Some(os_string) if os_string == "jitdump" => wasmtime::ProfilingStrategy::JitDump,
+		Some(_) => return Err(WasmError::Instantiation("Unknown profiling strategy".to_owned())),
+		None => wasmtime::ProfilingStrategy::None,
+	};
+	config
+		.profiler(profiler)
+		.map_err(|e| WasmError::Instantiation(format!("fail to set jitdump profiler: {}", e)))?;
+
 	if let Some(DeterministicStackLimit { native_stack_max, .. }) =
 		semantics.deterministic_stack_limit
 	{