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Explicit outputs for wasm_cc_binary (#1047)

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* Explicit outputs for wasm_cc_binary

* Backwards compatibility

* data_runfiles restore

* restore test_bazel.sh

* Using wrong path on accident

* two separate rules for legacy support

* Added name attribute to wasm_cc_binary rule
This commit is contained in:
Ezekiel Warren
2022-05-19 22:09:46 -07:00
committed by GitHub
parent b81dd8177d
commit 71f5fb0247
3 changed files with 130 additions and 70 deletions
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52
bazel/emscripten_toolchain/wasm_binary.py
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@@ -3,16 +3,9 @@
This script will take a tar archive containing the output of the emscripten
toolchain. This file contains any output files produced by a wasm_cc_binary or a
cc_binary built with --config=wasm. The files are extracted into the given
output path.
output paths.
The name of archive is expected to be of the format `foo` or `foo.XXX` and
the contents are expected to be foo.js and foo.wasm.
Several optional files may also be in the archive, including but not limited to
foo.js.mem, pthread-main.js, and foo.wasm.map.
If the file is not a tar archive, the passed file will simply be copied to its
destination.
The contents of the archive are expected to match the given outputs extnames.
This script and its accompanying Bazel rule should allow you to extract a
WebAssembly binary into a larger web application.
@@ -29,39 +22,34 @@ def ensure(f):
pass
def check(f):
if not os.path.exists(f):
raise Exception('Expected file in archive: %s' % f)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--archive', help='The archive to extract from.')
parser.add_argument('--output_path', help='The path to extract into.')
parser.add_argument('--outputs', help='Comma separated list of files that should be extracted from the archive. Only the extname has to match a file in the archive.')
parser.add_argument('--allow_empty_outputs', help='If an output listed in --outputs does not exist, create it anyways.', action='store_true')
args = parser.parse_args()
args.archive = os.path.normpath(args.archive)
args.outputs = args.outputs.split(",")
basename = os.path.basename(args.archive)
stem = basename.split('.')[0]
# Extract all files from the tarball.
tar = tarfile.open(args.archive)
tar.extractall(args.output_path)
# At least one of these two files should exist at this point.
ensure(os.path.join(args.output_path, stem + '.js'))
ensure(os.path.join(args.output_path, stem + '.wasm'))
for member in tar.getmembers():
extname = '.' + member.name.split('.', 1)[1]
for idx, output in enumerate(args.outputs):
if output.endswith(extname):
member_file = tar.extractfile(member)
with open(output, "wb") as output_file:
output_file.write(member_file.read())
args.outputs.pop(idx)
break
# And can optionally contain these extra files.
ensure(os.path.join(args.output_path, stem + '.wasm.map'))
ensure(os.path.join(args.output_path, stem + '.worker.js'))
ensure(os.path.join(args.output_path, stem + '.js.mem'))
ensure(os.path.join(args.output_path, stem + '.data'))
ensure(os.path.join(args.output_path, stem + '.fetch.js'))
ensure(os.path.join(args.output_path, stem + '.js.symbols'))
ensure(os.path.join(args.output_path, stem + '.wasm.debug.wasm'))
ensure(os.path.join(args.output_path, stem + '.html'))
for output in args.outputs:
extname = '.' + output.split('.', 1)[1]
if args.allow_empty_outputs:
ensure(output)
else:
print("[ERROR] Archive does not contain file with extname: %s" % extname)
if __name__ == '__main__':