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#!/usr/bin/env python3
import argparse
import os
import re
import subprocess
import sys
DESC = """
Build, trim, and optimize the `.wasm` file for inclusion in the
`mozilla/source-map` library.
Requires:
- wasm-nm: https://github.com/fitzgen/wasm-nm
- wasm-gc: https://github.com/alexcrichton/wasm-gc
- wasm-snip: https://github.com/fitzgen/wasm-snip
- wasm-opt: https://github.com/WebAssembly/binaryen
"""
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description=DESC)
parser.add_argument(
"-g",
"--debug",
action="store_true",
help="Include debug info (the \"name\" section) in the final `.wasm` file.")
parser.add_argument(
"-p",
"--profiling",
action="store_true",
help="Enable the `profiling` cargo feature.")
parser.add_argument(
"-o",
"--output",
type=str,
default=None,
help="The path to write the output `.wasm` file to. If not supplied, the `.wasm` file is written to `stdout`.")
parser.add_argument(
"--no-wasm-opt",
dest="wasm_opt",
action="store_false",
help="Do not run `wasm-opt`.")
parser.add_argument(
"--no-wasm-gc",
dest="wasm_gc",
action="store_false",
help="Do not run `wasm-gc`.")
parser.add_argument(
"--no-wasm-snip",
dest="wasm_snip",
action="store_false",
help="Do not run `wasm-snip`.")
def decode(f):
return f.decode(encoding="utf-8", errors="ignore")
def run(cmd, **kwargs):
sys.stderr.write(str(cmd) + "\n")
if "stdout" not in kwargs:
kwargs["stdout"] = subprocess.PIPE
child = subprocess.run(cmd, **kwargs)
if child.returncode != 0:
raise Exception("{} did not exit OK".format(str(cmd)))
return decode(child.stdout)
def add_path_ext_prefix(path, prefix):
(root, ext) = os.path.splitext(path)
return root + "." + prefix + ext
def build(args):
cmd = ["cargo", "build", "--release", "--target", "wasm32-unknown-unknown"]
if args.profiling:
cmd.extend(["--features", "profiling"])
run(cmd)
return "./target/wasm32-unknown-unknown/release/source_map_mappings_wasm_api.wasm"
def wasm_gc(args, wasm_path):
if not args.wasm_gc:
return wasm_path
out_path = add_path_ext_prefix(wasm_path, "gc")
run(["wasm-gc", wasm_path, out_path])
return out_path
SHOULD_SNIP = [
re.compile(r".*(std|core)(9|::)panicking.*"),
re.compile(r".*(std|core)(3|::)fmt.*"),
re.compile(r".*core(6|::)option(13|::)expect_failed.*"),
re.compile(r".*core(5|::)slice(\d+|::)slice_index_.*_fail.*"),
re.compile(r".*core(3|::)str(\d+|::)slice_.*_fail.*"),
re.compile(r".*core(6|::)result(13|::)unwrap_failed.*"),
re.compile(r".*std(6|::)thread(5|::)local.*"),
re.compile(r".*std(2|::)io(5|::).*"),
re.compile(r"__.*2"),
re.compile(r".*(std|core)(5|::)error.*"),
re.compile(r".*(std|core)(3|::)any(3|::)Any.*"),
]
def wasm_snip(args, wasm_path):
if not args.wasm_snip:
return wasm_path
out_path = add_path_ext_prefix(wasm_path, "snip")
private_functions = run(["wasm-nm", "-j", wasm_path]).splitlines()
snip_functions = set()
for snip in SHOULD_SNIP:
snip_functions.update(filter(lambda f: re.match(snip, f),
private_functions))
run(["wasm-snip", "-o", out_path, wasm_path, *snip_functions]),
return out_path
def wasm_opt(args, wasm_path):
if not args.wasm_opt:
return wasm_path
out_path = add_path_ext_prefix(wasm_path, "opt")
cmd = [
"wasm-opt",
"-O3",
"-Oz",
"--duplicate-function-elimination",
"-o", out_path,
wasm_path
]
if args.debug:
cmd.append("-g")
run(cmd)
return out_path
def main():
args = parser.parse_args()
os.chdir(os.path.dirname(sys.argv[0]))
wasm_path = build(args)
wasm_path = wasm_gc(args, wasm_path)
wasm_path = wasm_snip(args, wasm_path)
# GC again after snipping.
wasm_path = wasm_gc(args, wasm_path)
wasm_path = wasm_opt(args, wasm_path)
if args.output:
run(["cp", wasm_path, args.output])
else:
run(["cat", wasm_path], stdout=subprocess.STDOUT)
if __name__ == "__main__":
main()
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