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wasm backend: emit a TODO error rather than miscompile

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This commit is contained in:
Andrew Kelley
2023-05-26 13:16:33 -07:00
parent 8f5f8090c5
commit dbd44658ff
1 changed files with 8 additions and 3 deletions
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11
src/arch/wasm/CodeGen.zig
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@@ -3090,9 +3090,14 @@ fn lowerConstant(func: *CodeGen, arg_val: Value, ty: Type) InnerError!WValue {
},
.ErrorUnion => {
const error_type = ty.errorUnionSet();
const is_pl = val.errorUnionIsPayload();
const err_val = if (!is_pl) val else Value.initTag(.zero);
return func.lowerConstant(err_val, error_type);
const payload_type = ty.errorUnionPayload();
if (!payload_type.hasRuntimeBitsIgnoreComptime()) {
// We use the error type directly as the type.
const is_pl = val.errorUnionIsPayload();
const err_val = if (!is_pl) val else Value.initTag(.zero);
return func.lowerConstant(err_val, error_type);
}
return func.fail("Wasm TODO: lowerConstant error union with non-zero-bit payload type", .{});
},
.Optional => if (ty.optionalReprIsPayload()) {
var buf: Type.Payload.ElemType = undefined;