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Map u64/i64 to BigInt in JS

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This commit is an implementation of mapping u64/i64 to `BigInt` in JS through
the unstable BigInt APIs. The BigInt type will ship soon in Chrome and so this
commit builds out the necessary support for wasm-bindgen to use it!
This commit is contained in:
Alex Crichton
2018-05-05 14:10:25 -07:00
parent 484fbbfe31
commit 237fff0698
10 changed files with 364 additions and 63 deletions
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42
crates/cli-support/src/js/js2rust.rs
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@ -168,6 +168,29 @@ impl<'a, 'b> Js2Rust<'a, 'b> {
return Ok(self)
}
if let Some(signed) = arg.get_64bit() {
let f = if signed {
self.cx.expose_int64_cvt_shim()
} else {
self.cx.expose_uint64_cvt_shim()
};
self.cx.expose_uint32_memory();
self.cx.expose_global_argument_ptr()?;
self.js_arguments.push((name.clone(), "BigInt".to_string()));
self.prelude(&format!("\
{f}[0] = {name};\n\
const lo{i} = u32CvtShim[0];\n\
const hi{i} = u32CvtShim[1];\n\
",
i = i,
f = f,
name = name,
));
self.rust_arguments.push(format!("lo{}", i));
self.rust_arguments.push(format!("hi{}", i));
return Ok(self)
}
if arg.is_ref_anyref() {
self.js_arguments.push((name.clone(), "any".to_string()));
self.cx.expose_borrowed_objects();
@ -252,6 +275,25 @@ impl<'a, 'b> Js2Rust<'a, 'b> {
return Ok(self)
}
if let Some(signed) = ty.get_64bit() {
self.ret_ty = "BigInt".to_string();
self.cx.expose_global_argument_ptr()?;
let f = if signed {
self.cx.expose_int64_memory();
"getInt64Memory"
} else {
self.cx.expose_uint64_memory();
"getUint64Memory"
};
self.prelude("const retptr = globalArgumentPtr();");
self.rust_arguments.insert(0, "retptr".to_string());
self.ret_expr = format!("\
RET;\n\
return {}()[retptr / 8];\n\
", f);
return Ok(self)
}
match *ty {
Descriptor::Boolean => {
self.ret_ty = "boolean".to_string();