Unable to parse clang generated bitcode target to wasm32

[jw910731]

Problem

I compiled a simple C source by using clang and target to two different platform: wasm32 and native(aarch64).

clang -c -emit-llvm --target=wasm32 test.c
clang -c -emit-llvm -fno-unwind-tables test.c

Here is the two bitcode file generated separately by the above two command, test.bc is target to wasm32 and test.arm.bc is target to aarch64.
test_file.zip
These two file are fed to the program with following source code:

use std::{env, fs, io::stdin};

use llvm_bitstream::Bitstream;
use llvm_mapper::unroll::UnrolledBitcode;
fn main() {
    let fname;
    let args: Vec<String> = env::args().collect();
    if args.len() <= 1 {
        fname = stdin().lines().next().unwrap().unwrap();
    } else {
        fname = args[1].clone();
    }
    let content = fs::read(fname).expect("Open file error");
    let (_, bitstream) = Bitstream::from(content).unwrap();
    let bitcode = UnrolledBitcode::try_from(bitstream).unwrap();
    println!("{:?}", bitcode)
}

The result is the file target to aarch64 can be parsed without error, and wasm32 file will generate this error:

... on an `Err` value: Map(Module(DataLayoutRecord(BadInt(ParseIntError { kind: Empty }))))' ...

System Info

clang version: Apple clang version 14.0.3 (clang-1403.0.22.14.1)
Platform: Macbook Air M2 (Darwin 22.6.0 arm64)

[woodruffw]

Thanks for the report! I've followed up on your PR.