add feature wasmtime-jitdump

client/executor/wasmtime/Cargo.toml

@@ -23,7 +23,11 @@ sp-wasm-interface = { version = "4.0.0-dev", path = "../../../primitives/wasm-in
 sp-runtime-interface = { version = "4.0.0-dev", path = "../../../primitives/runtime-interface" }
 sp-core = { version = "4.0.0-dev", path = "../../../primitives/core" }
 sc-allocator = { version = "4.0.0-dev", path = "../../allocator" }
-wasmtime = { version = "0.29.0", default-features = false, features = ["cache", "parallel-compilation"] }
+wasmtime = { version = "0.29.0", default-features = false, features = [
+    "cache",
+    "jitdump",
+    "parallel-compilation",
+] }
 
 [dev-dependencies]
 sc-runtime-test = { version = "2.0.0", path = "../runtime-test" }

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 | No profiling (warning)  |
+
 mod host;
 mod imports;
 mod instance_wrapper;

client/executor/wasmtime/src/runtime.rs

@@ -38,7 +38,10 @@ use sp_wasm_interface::{Function, Pointer, Value, WordSize};
 use std::{
 	path::{Path, PathBuf},
 	rc::Rc,
-	sync::Arc,
+	sync::{
+		atomic::{AtomicBool, Ordering},
+		Arc,
+	},
 };
 use wasmtime::{AsContext, AsContextMut, Engine, StoreLimits};
 
@@ -322,6 +325,23 @@ 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,
+		None => wasmtime::ProfilingStrategy::None,
+		Some(_) => {
+			// Remember if we have already logged a warning due to an unknown profiling strategy.
+			static UNKNOWN_PROFILING_STRATEGY: AtomicBool = AtomicBool::new(false);
+			// Make sure that the warning will not be relogged regularly.
+			if !UNKNOWN_PROFILING_STRATEGY.swap(true, Ordering::Relaxed) {
+				log::warn!("WASMTIME_PROFILING_STRATEGY is set to unknown value, ignored.");
+			}
+			wasmtime::ProfilingStrategy::None
+		},
+	};
+	config
+		.profiler(profiler)
+		.map_err(|e| WasmError::Instantiation(format!("fail to set profiler: {}", e)))?;
+
 	if let Some(DeterministicStackLimit { native_stack_max, .. }) =
 		semantics.deterministic_stack_limit
 	{