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#!/usr/bin/env python
# Copyright 2019 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be found
# in the LICENSE file.
import argparse
import io
import sys
from wasm import *
FUNCTION_SECTION_ID = 3
def parse_args():
parser = argparse.ArgumentParser(\
description="Inject compilation hints into a Wasm module.")
parser.add_argument("-i", "--in-wasm-file", \
type=str, \
help="original wasm module")
parser.add_argument("-o", "--out-wasm-file", \
type=str, \
help="wasm module with injected hints")
parser.add_argument("-x", "--hints-file", \
type=str, required=True, \
help="binary hints file to be injected as a custom section " + \
"'compilationHints'")
return parser.parse_args()
if __name__ == "__main__":
args = parse_args()
in_wasm_file = args.in_wasm_file if args.in_wasm_file else sys.stdin.fileno()
out_wasm_file = args.out_wasm_file if args.out_wasm_file else sys.stdout.fileno()
hints_bs = open(args.hints_file, "rb").read()
with io.open(in_wasm_file, "rb") as fin:
with io.open(out_wasm_file, "wb") as fout:
magic_number, bs = read_magic_number(fin);
fout.write(bs)
version, bs = read_version(fin);
fout.write(bs)
num_declared_functions = None
while True:
id, bs = read_varuintN(fin)
fout.write(bs)
if id == None:
break
payload_length, bs = read_varuintN(fin)
fout.write(bs)
# Peek into function section for upcoming validity check.
if id == FUNCTION_SECTION_ID:
num_declared_functions, bs = peek_varuintN(fin)
bs = fin.read(payload_length)
fout.write(bs)
# Instert hint section after function section.
if id == FUNCTION_SECTION_ID:
assert len(hints_bs) == num_declared_functions, "unexpected number of hints"
write_compilation_hints_section(fout, hints_bs)
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