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wasm: Implement set_union_tag

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Luuk de Gram 2022-01-21 20:06:03 +01:00
parent 0817d6b215
commit 4b939fb34d
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1 changed files with 27 additions and 2 deletions
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29
src/arch/wasm/CodeGen.zig
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@ -1454,6 +1454,7 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.slice_ptr => self.airSlicePtr(inst),
.store => self.airStore(inst),
.set_union_tag => self.airSetUnionTag(inst),
.struct_field_ptr => self.airStructFieldPtr(inst),
.struct_field_ptr_index_0 => self.airStructFieldPtrIndex(inst, 0),
.struct_field_ptr_index_1 => self.airStructFieldPtrIndex(inst, 1),
@ -1494,7 +1495,7 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.fpext,
.unwrap_errunion_payload_ptr,
.unwrap_errunion_err_ptr,
.set_union_tag,
.get_union_tag,
.ptr_slice_len_ptr,
.ptr_slice_ptr_ptr,
@ -1518,7 +1519,7 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.sub_with_overflow,
.mul_with_overflow,
.shl_with_overflow,
=> |tag| self.fail("TODO: Implement wasm inst: {s}", .{@tagName(tag)}),
=> |tag| return self.fail("TODO: Implement wasm inst: {s}", .{@tagName(tag)}),
};
}
@ -1596,6 +1597,8 @@ fn airCall(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
break :blk func.data.owner_decl;
} else if (func_val.castTag(.extern_fn)) |ext_fn| {
break :blk ext_fn.data;
} else if (func_val.castTag(.decl_ref)) |decl_ref| {
break :blk decl_ref.data;
}
return self.fail("Expected a function, but instead found type '{s}'", .{func_val.tag()});
};
@ -3177,3 +3180,25 @@ fn cmpBigInt(self: *Self, lhs: WValue, rhs: WValue, operand_ty: Type, op: std.ma
try self.addLabel(.local_set, result.local);
return result;
}
fn airSetUnionTag(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const bin_op = self.air.instructions.items(.data)[inst].bin_op;
const un_ty = self.air.typeOf(bin_op.lhs).childType();
const tag_ty = self.air.typeOf(bin_op.rhs);
const layout = un_ty.unionGetLayout(self.target);
if (layout.tag_size == 0) return WValue{ .none = {} };
const union_ptr = try self.resolveInst(bin_op.lhs);
const new_tag = try self.resolveInst(bin_op.rhs);
if (layout.payload_size == 0) {
try self.store(union_ptr, new_tag, tag_ty, 0);
return WValue{ .none = {} };
}
// when the tag alignment is smaller than the payload, the field will be stored
// after the payload.
const offset = if (layout.tag_align < layout.payload_align) blk: {
break :blk @intCast(u32, layout.payload_size);
} else @as(u32, 0);
try self.store(union_ptr, new_tag, tag_ty, offset);
return WValue{ .none = {} };
}