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use std::collections::BTreeMap;
use anyhow::Result;
use turbo_tasks::Vc;
use turbo_tasks_fs::FileContent;
use turbopack_core::asset::Asset;
use wasmparser::{Chunk, Parser, Payload};
use crate::source::WebAssemblySource;
/// Imports and exports of a WebAssembly file.
#[turbo_tasks::value]
#[derive(Default)]
pub(crate) struct WebAssemblyAnalysis {
pub imports: BTreeMap<String, Vec<String>>,
pub exports: Vec<String>,
}
/// Analyse a WebAssembly file.
///
/// Extracts imports and exports.
#[turbo_tasks::function]
pub(crate) async fn analyze(source: Vc<WebAssemblySource>) -> Result<Vc<WebAssemblyAnalysis>> {
let content = source.content().file_content().await?;
let mut analysis = WebAssemblyAnalysis::default();
let FileContent::Content(file) = &*content else {
return Ok(analysis.cell());
};
let mut bytes = &*file.content().to_bytes();
let mut parser = Parser::new(0);
loop {
let payload = match parser.parse(bytes, true)? {
Chunk::Parsed { consumed, payload } => {
bytes = &bytes[consumed..];
payload
}
// this state isn't possible with `eof = true`
Chunk::NeedMoreData(_) => unreachable!(),
};
match payload {
Payload::ImportSection(s) => {
for import in s {
let import = import?;
analysis
.imports
.entry(import.module.to_string())
.or_default()
.push(import.name.to_string());
}
}
Payload::ExportSection(s) => {
for export in s {
let export = export?;
analysis.exports.push(export.name.to_string());
}
}
// skip over code sections
Payload::CodeSectionStart { size, .. } => {
parser.skip_section();
bytes = &bytes[size as usize..];
}
Payload::End(_) => break,
_ => {}
}
}
Ok(analysis.cell())
}
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