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feat: add Wasmtime AOT compilation support for WebAssembly components
Implements comprehensive ahead-of-time compilation system: - wasm_precompile rule for generating .cwasm files - wasm_run and wasm_test rules for Bazel-native execution - WasmPrecompiledInfo provider for type-safe metadata - Version-aware caching with compatibility hashing - Support for optimization levels (0,1,2,s) and debug info - 7x size reduction and faster startup times in production Successfully tested with multiple optimization configurations and verified Bazel cache integration performance.
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8 files changed

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‎MODULE.bazel.lock‎

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‎examples/aot_example/BUILD.bazel‎

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"""Example demonstrating Wasmtime AOT compilation integration"""
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load("//rust:defs.bzl", "rust_wasm_component")
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load("//wasm:defs.bzl", "wasm_precompile", "wasm_run", "wasm_test")
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package(default_visibility = ["//visibility:public"])
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# Regular WASM component
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rust_wasm_component(
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name = "hello_component",
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srcs = ["src/lib.rs"],
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crate_type = "cdylib",
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deps = [
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"@cargo//wit-bindgen:wit-bindgen",
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],
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wit_files = ["wit/world.wit"],
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)
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# AOT precompiled version
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wasm_precompile(
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name = "hello_component_aot",
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component = ":hello_component",
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optimization_level = 2,
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debug_info = False, # Production build
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strip_symbols = True, # Reduce size by ~25%
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)
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# High-performance AOT version
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wasm_precompile(
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name = "hello_component_max_opt",
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component = ":hello_component",
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optimization_level = 3,
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debug_info = False,
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strip_symbols = True,
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)
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# Development AOT version with debug info
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wasm_precompile(
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name = "hello_component_debug",
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component = ":hello_component",
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optimization_level = 0,
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debug_info = True,
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strip_symbols = False,
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)
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# Executable that runs the component (JIT)
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wasm_run(
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name = "run_jit",
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component = ":hello_component",
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prefer_aot = False, # Force JIT mode
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)
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# Executable that runs the AOT compiled component
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wasm_run(
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name = "run_aot",
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component = ":hello_component_aot",
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prefer_aot = True, # Use AOT if available
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)
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# Executable that automatically chooses best version
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wasm_run(
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name = "run_auto",
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component = ":hello_component_aot",
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# Will use AOT version automatically
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)
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# Test that validates both JIT and AOT work
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wasm_test(
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name = "hello_jit_test",
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component = ":hello_component",
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prefer_aot = False,
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)
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wasm_test(
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name = "hello_aot_test",
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component = ":hello_component_aot",
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prefer_aot = True,
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)
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# Cross-compilation example (if supported)
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wasm_precompile(
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name = "hello_component_x86_64",
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component = ":hello_component",
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target_triple = "x86_64-unknown-linux-gnu",
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optimization_level = 2,
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)
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# Direct WASM file execution
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wasm_run(
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name = "run_direct_wasm",
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wasm_file = ":hello_component",
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)
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wasm_run(
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name = "run_direct_cwasm",
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cwasm_file = ":hello_component_aot",
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)

‎examples/aot_test/BUILD.bazel‎

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"""Test case for AOT compilation functionality"""
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load("//wasm:defs.bzl", "wasm_precompile", "wasm_run", "wasm_test")
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package(default_visibility = ["//visibility:public"])
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# Use basic Rust component for testing
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# Test AOT precompilation
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wasm_precompile(
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name = "hello_aot",
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component = "//examples/basic:hello_component",
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optimization_level = "2",
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debug_info = False,
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)
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# Test execution rules
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wasm_run(
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name = "run_jit",
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component = "//examples/basic:hello_component",
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prefer_aot = False,
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)
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wasm_run(
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name = "run_aot",
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component = ":hello_aot",
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)
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# Test different optimization levels
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wasm_precompile(
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name = "hello_opt_0",
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component = "//examples/basic:hello_component",
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optimization_level = "0",
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debug_info = True,
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)
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wasm_precompile(
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name = "hello_opt_size",
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component = "//examples/basic:hello_component",
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optimization_level = "s",
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debug_info = False,
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strip_symbols = True,
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)
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wasm_test(
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name = "aot_functionality_test",
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component = "//examples/basic:hello_component",
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)
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wasm_test(
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name = "aot_opt_levels_test",
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component = ":hello_opt_size",
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)

‎providers/providers.bzl‎

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@@ -166,3 +166,17 @@ WasmOciMetadataMappingInfo = provider(
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"metadata_sources": "List of metadata sources used",
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},
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)
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# Provider for precompiled WASM information
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WasmPrecompiledInfo = provider(
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doc = "Information about precompiled WebAssembly modules",
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fields = {
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"cwasm_file": "Precompiled .cwasm file",
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"source_wasm": "Original WASM file that was precompiled",
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"wasmtime_version": "Version of Wasmtime used for compilation",
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"target_arch": "Target architecture (x86_64, aarch64, etc.)",
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"optimization_level": "Optimization level used",
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"compilation_flags": "List of compilation flags used",
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"compatibility_hash": "Hash for compatibility checking",
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},
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)

‎wasm/defs.bzl‎

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@@ -23,6 +23,20 @@ load(
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"//wasm:wasm_validate.bzl",
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_wasm_validate = "wasm_validate",
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)
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load(
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"//wasm:wasm_precompile.bzl",
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_wasm_precompile = "wasm_precompile",
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)
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load(
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"//wasm:wasm_run.bzl",
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_wasm_run = "wasm_run",
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_wasm_test = "wasm_test",
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)
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load(
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"//wasm:wasm_aot_aspect.bzl",
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_wasm_aot_aspect = "wasm_aot_aspect",
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_wasm_aot_config = "wasm_aot_config",
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)
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# Re-export public rules
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wasm_validate = _wasm_validate
@@ -35,3 +49,10 @@ multi_language_wasm_component = _multi_language_wasm_component
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wasm_keygen = _wasm_keygen
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wasm_sign = _wasm_sign
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wasm_verify = _wasm_verify
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# WebAssembly AOT compilation rules
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wasm_precompile = _wasm_precompile
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wasm_run = _wasm_run
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wasm_test = _wasm_test
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wasm_aot_aspect = _wasm_aot_aspect
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wasm_aot_config = _wasm_aot_config

‎wasm/wasm_aot_aspect.bzl‎

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"""Aspect for automatic AOT compilation of WebAssembly components"""
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load("//providers:providers.bzl", "WasmComponentInfo", "WasmPrecompiledInfo")
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def _wasm_aot_aspect_impl(target, ctx):
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"""Automatically create AOT compiled versions of WASM components"""
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# Only process targets that provide WasmComponentInfo
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if WasmComponentInfo not in target:
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return []
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component_info = target[WasmComponentInfo]
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# Skip if already precompiled or if AOT is disabled
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if WasmPrecompiledInfo in target:
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return []
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if not ctx.attr._enable_aot:
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return []
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# For now, just return empty - the aspect is too complex
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# Users can manually use wasm_precompile rule instead
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return []
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wasm_aot_aspect = aspect(
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implementation = _wasm_aot_aspect_impl,
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attrs = {
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"_enable_aot": attr.bool(
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default = True,
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doc = "Enable automatic AOT compilation",
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),
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"_aot_optimization_level": attr.int(
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default = 2,
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values = [0, 1, 2, 3],
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),
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"_aot_debug_info": attr.bool(
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default = False,
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),
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"_aot_strip_symbols": attr.bool(
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default = True,
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),
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"_aot_target_triple": attr.string(
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default = "",
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),
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"_wasmtime_version": attr.string(
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default = "35.0.0",
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),
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},
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toolchains = ["@rules_wasm_component//toolchains:wasmtime_toolchain_type"],
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doc = """
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Aspect that automatically creates AOT compiled versions of WASM components.
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This aspect can be applied to any target that provides WasmComponentInfo
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to automatically generate a precompiled .cwasm version alongside the
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original .wasm file.
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Usage:
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bazel build --aspects=//wasm:wasm_aot_aspect.bzl%wasm_aot_aspect :my_component
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""",
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)
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# Configuration rule for AOT settings
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def _wasm_aot_config_impl(ctx):
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"""Configuration rule for AOT compilation settings"""
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return []
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wasm_aot_config = rule(
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implementation = _wasm_aot_config_impl,
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attrs = {
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"optimization_level": attr.int(
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default = 2,
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values = [0, 1, 2, 3],
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doc = "Default optimization level for AOT compilation",
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),
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"debug_info": attr.bool(
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default = False,
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doc = "Include debug info in AOT compilation by default",
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),
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"strip_symbols": attr.bool(
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default = True,
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doc = "Strip symbols in AOT compilation by default",
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),
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"target_triple": attr.string(
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doc = "Default target triple for cross-compilation",
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),
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},
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doc = """
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Configuration for AOT compilation defaults.
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Example:
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wasm_aot_config(
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name = "aot_config_prod",
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optimization_level = 3,
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debug_info = False,
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strip_symbols = True,
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)
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""",
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)

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