debuginfo-split 0.1.0

Splits out the debugging informations
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use clap::Parser;
use std::fs::File;
use std::io::prelude::*;
use std::sync::Arc;
use std::sync::Mutex;

type BoxError = Box<dyn std::error::Error>;

#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
#[clap(propagate_version = true)]
struct Args {
    /// Source WebAssembly module
    source: String,
    /// Out file
    out: String,
}

fn main() -> Result<(), BoxError> {
    let args = Args::parse();

    let mut input = Vec::new();
    {
        let mut file = File::open(&args.source).expect("File not found");
        file.read_to_end(&mut input)
            .expect("Error while reading file");
    }

    let input = wasm_parser::parse(&input)
        .map_err(|err| format!("failed to parse Wasm module: {}", err))?;
    let wasm = core_wasm_ast::traverse::WasmModule::new(Arc::new(input));

    let mut name_section = None;
    // let debug_wasm = core_wasm_ast::traverse::WasmModule::new(Arc::new(core_wasm_ast::Module {
    //     sections: Arc::new(Mutex::new(vec![])),
    // }));

    let mut custom_sections_to_remove = vec![];

    for section in wasm.get_custom_sections() {
        match section {
            core_wasm_ast::CustomSection::Unknown(name, _) => {
                custom_sections_to_remove.push(name.clone());
            }
            core_wasm_ast::CustomSection::Name(n) => {
                name_section = Some(n.clone());
                // debug_wasm.add_section(core_wasm_ast::Section::Custom((
                //     core_wasm_ast::Value::new(0),
                //     Arc::new(Mutex::new(section.clone())),
                // )));

                custom_sections_to_remove.push("name".to_owned());
            }
            _ => {}
        }
    }

    println!("removing custom sections: {custom_sections_to_remove:?}");
    for section in &custom_sections_to_remove {
        wasm.remove_custom_section(section);
    }

    // FIXME add debug id to correlate debugging symbols with binary

    // override input with stripped down version
    {
        let bytes = wasm_printer::wasm::print(&wasm.into_inner()).unwrap();
        let mut file = File::create(&args.source)?;
        file.write_all(&bytes)?;
    }


    // write name section
    {
        let mut bytes = vec![];
        wasm_printer::wasm::write_section_custom_name(&mut bytes, &name_section.unwrap()).unwrap();
        let mut file = File::create(&args.out)?;
        file.write_all(&bytes)?;
    }

    // // create debug info only wasm module
    // let debuginfo_bytes = wasm_printer::wasm::print(&debug_wasm.into_inner()).unwrap();
    // {
    //     let mut file = File::create(&args.out)?;
    //     file.write_all(&debuginfo_bytes)?;
    // }

    Ok(())
}