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Merge pull request #1606 from alexcrichton/gc-elss

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Preserve the function table during early gc passes
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Alex Crichton 2019-06-19 13:10:45 -05:00 committed by GitHub
commit e7902f384f
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1 changed files with 17 additions and 0 deletions
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17
crates/cli-support/src/descriptors.rs
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@ -40,7 +40,24 @@ pub fn execute(module: &mut Module) -> Result<WasmBindgenDescriptorsSectionId, E
// Delete all descriptor functions and imports from the module now that
// we've executed all of them.
//
// Note though that during this GC pass it's a bit aggressive in that it can
// delete the function table entirely. We don't actually know at this point
// whether we need the function table or not. The bindings generation may
// need to export the table so the JS glue can call functions in it, and
// that's only discovered during binding selection. For now we just add
// synthetic root exports for all tables in the module, and then we delete
// the exports just after GC. This should keep tables like the function
// table alive during GC all the way through to the bindings generation
// where we can either actually export it or gc it out since it's not used.
let mut exported_tables = Vec::new();
for table in module.tables.iter() {
exported_tables.push(module.exports.add("foo", table.id()));
}
walrus::passes::gc::run(module);
for export in exported_tables {
module.exports.delete(export);
}
Ok(module.customs.add(section))
}