Implement --native flag for standalone executables

Add `wafer build --native` to produce self-contained native executables.
The approach appends AOT-precompiled WASM and metadata to a copy of the
wafer binary itself, requiring no Rust toolchain at build time.

On startup, the binary checks for an appended payload (8-byte "WAFEREXE"
magic trailer). If found, it deserializes the precompiled module and runs
it directly, skipping CLI argument parsing entirely.

Uses wasmtime's Engine::precompile_module() for AOT compilation at build
time and Module::deserialize() at runtime — instant startup with no JIT.

Binary layout: [wafer binary][precompiled wasm][metadata json][trailer]
Trailer: payload_len(u64 LE) + metadata_len(u64 LE) + "WAFEREXE"

Also refactored runner.rs: extracted shared run_module() to avoid
duplication between run_wasm_bytes() and run_precompiled_bytes().
Made serialize_metadata() public for CLI use.

This commit is contained in:

Oleksandr Kozachuk

2026-04-04 12:10:13 +02:00

parent 3a0f328f90

commit db6292add6

5 changed files with 184 additions and 44 deletions

									
										crates/cli/Cargo.toml
									
		+1
		
												View File
												
				@@ -10,6 +10,7 @@ workspace = true

				[dependencies]

				wafer-core = { path = "../core", version = "0.1.0" }

				wasmtime = { workspace = true }

				anyhow = { workspace = true }

				clap = { version = "4", features = ["derive"] }

				rustyline = "15"