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spirv: optional types

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Implements lowering optional types in the SPIR-V backend.
This commit is contained in:
Robin Voetter 2022-12-10 01:44:05 +01:00
parent 3c7f93aa69
commit 27833004db
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1 changed files with 22 additions and 0 deletions
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22
src/codegen/spirv.zig
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@ -776,6 +776,28 @@ pub const DeclGen = struct {
};
return try self.spv.resolveType(SpvType.initPayload(&payload.base));
},
.Optional => {
var buf: Type.Payload.ElemType = undefined;
const payload_ty = ty.optionalChild(&buf);
if (!payload_ty.hasRuntimeBitsIgnoreComptime()) {
// Just use a bool.
return try self.resolveType(Type.initTag(.bool), repr);
}
const payload_ty_ref = try self.resolveType(payload_ty, .indirect);
if (ty.optionalReprIsPayload()) {
// Optional is actually a pointer.
return payload_ty_ref;
}
const bool_ty_ref = try self.resolveType(Type.initTag(.bool), .indirect);
// its an actual optional
return try self.simpleStructType(&.{
.{ .ty = payload_ty_ref, .name = "payload" },
.{ .ty = bool_ty_ref, .name = "valid" },
});
},
.Null,
.Undefined,
.EnumLiteral,