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2629ee4eb0
With https://github.com/llvm/llvm-project/pull/150201 being merged, there is now a better way to generate the Emscripten trampoline, instead of including hand-generated binary WASM content. Requires Emscripten 4.0.12.
54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
#!/usr/bin/env python3
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import argparse
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import sys
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from pathlib import Path
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JS_TEMPLATE = """
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#include "emscripten.h"
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EM_JS(void, {function_name}, (void), {{
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return new WebAssembly.Module(hexStringToUTF8Array("{hex_string}"));
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}}
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function hexStringToUTF8Array(hex) {{
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const bytes = [];
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for (let i = 0; i < hex.length; i += 2) {{
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bytes.push(parseInt(hex.substr(i, 2), 16));
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}}
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return new Uint8Array(bytes);
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}});
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"""
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def prepare_wasm(input_file, output_file, function_name):
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# Read the compiled WASM as binary and convert to hex
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wasm_bytes = Path(input_file).read_bytes()
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hex_string = "".join(f"{byte:02x}" for byte in wasm_bytes)
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# Generate JavaScript module
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js_content = JS_TEMPLATE.format(
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function_name=function_name, hex_string=hex_string
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)
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Path(output_file).write_text(js_content)
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print(
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f"Successfully compiled {input_file} and generated {output_file}"
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)
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return 0
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def main():
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parser = argparse.ArgumentParser(
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description="Compile WebAssembly text files using wasm-as"
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)
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parser.add_argument("input_file", help="Input .wat file to compile")
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parser.add_argument("output_file", help="Output file name")
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parser.add_argument("function_name", help="Name of the export function")
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args = parser.parse_args()
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return prepare_wasm(args.input_file, args.output_file, args.function_name)
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if __name__ == "__main__":
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sys.exit(main())
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