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LibWasm: Preserve sign bit across JS boundary in test-wasm
A `Uint8Array` can now be passed in the Wasm testjs files to be transmuted into a Wasm value.
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commit
6493acf2f4
Notes:
sideshowbarker
2024-07-17 07:08:37 +09:00
Author: https://github.com/dzfrias Commit: https://github.com/LadybirdBrowser/ladybird/commit/6493acf2f4 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/459 Reviewed-by: https://github.com/alimpfard
@ -200,7 +200,7 @@ def make_description(input_path: Path, name: str, out_path: Path) -> WastDescrip
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return parse(description)
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def gen_value(value: WasmValue) -> str:
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def gen_value(value: WasmValue, as_arg=False) -> str:
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def unsigned_to_signed(uint: int, bits: int) -> int:
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max_value = 2**bits
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if uint >= 2 ** (bits - 1):
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@ -221,7 +221,13 @@ def gen_value(value: WasmValue) -> str:
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f = struct.unpack("d", b)[0]
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return f
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def float_to_str(f: float) -> str:
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def float_to_str(f: float, preserve_nan_sign=False) -> str:
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if math.isnan(f) and preserve_nan_sign:
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f_bytes = struct.pack("d", f)
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# -NaN does not preserve the sign bit in JavaScript land, so if
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# we want to preserve NaN "sign", we pass in raw bytes
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return f"new Uint8Array({list(f_bytes)})"
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if math.isnan(f) and math.copysign(1.0, f) < 0:
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return "-NaN"
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elif math.isnan(f):
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@ -234,8 +240,6 @@ def gen_value(value: WasmValue) -> str:
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if value.value.startswith("nan"):
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return "NaN"
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elif value.value.startswith("-nan"):
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return "-NaN"
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elif value.value == "inf":
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return "Infinity"
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elif value.value == "-inf":
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@ -247,9 +251,9 @@ def gen_value(value: WasmValue) -> str:
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case "i64":
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return str(unsigned_to_signed(int(value.value), 64)) + "n"
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case "f32":
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return float_to_str(int_to_float_bitcast(int(value.value)))
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return float_to_str(int_to_float_bitcast(int(value.value)), as_arg)
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case "f64":
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return float_to_str(int_to_float64_bitcast(int(value.value)))
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return float_to_str(int_to_float64_bitcast(int(value.value)), as_arg)
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case "externref" | "funcref" | "v128":
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return value.value
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case _:
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@ -257,7 +261,7 @@ def gen_value(value: WasmValue) -> str:
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def gen_args(args: list[WasmValue]) -> str:
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return ",".join(gen_value(arg) for arg in args)
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return ",".join(gen_value(arg, True) for arg in args)
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def gen_module_command(command: ModuleCommand, ctx: Context):
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@ -256,7 +256,17 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyModule::wasm_invoke)
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for (auto& param : type->parameters()) {
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auto argument = vm.argument(index++);
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double double_value = 0;
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if (!argument.is_bigint())
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if (argument.is_object()) {
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auto object = MUST(argument.to_object(vm));
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// Uint8Array allows for raw bytes to be passed into Wasm. This is
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// particularly useful for preserving the sign bit of a NaN
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if (!is<JS::Uint8Array>(*object))
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return vm.throw_completion<JS::TypeError>("Expected a Uint8Array object"sv);
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auto& array = static_cast<JS::Uint8Array&>(*object);
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if (array.array_length().length() != 8)
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return vm.throw_completion<JS::TypeError>("Expected a Uint8Array of size 8"sv);
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memcpy(&double_value, array.data().data(), sizeof(double));
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} else if (!argument.is_bigint())
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double_value = TRY(argument.to_double(vm));
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switch (param.kind()) {
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case Wasm::ValueType::Kind::I32:
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