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wasm: Implement get_union_tag

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Luuk de Gram 2022-01-22 14:11:12 +01:00
parent 4b939fb34d
commit 288b407fa9
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1 changed files with 19 additions and 1 deletions
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20
src/arch/wasm/CodeGen.zig
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@ -1419,6 +1419,7 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.dbg_stmt => WValue.none,
.intcast => self.airIntcast(inst),
.float_to_int => self.airFloatToInt(inst),
.get_union_tag => self.airGetUnionTag(inst),
.is_err => self.airIsErr(inst, .i32_ne),
.is_non_err => self.airIsErr(inst, .i32_eq),
@ -1496,7 +1497,6 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.unwrap_errunion_payload_ptr,
.unwrap_errunion_err_ptr,
.get_union_tag,
.ptr_slice_len_ptr,
.ptr_slice_ptr_ptr,
.int_to_float,
@ -3202,3 +3202,21 @@ fn airSetUnionTag(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
try self.store(union_ptr, new_tag, tag_ty, offset);
return WValue{ .none = {} };
}
fn airGetUnionTag(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
if (self.liveness.isUnused(inst)) return WValue{ .none = {} };
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const un_ty = self.air.typeOf(ty_op.operand);
const tag_ty = self.air.typeOfIndex(inst);
const layout = un_ty.unionGetLayout(self.target);
if (layout.tag_size == 0) return WValue{ .none = {} };
const operand = try self.resolveInst(ty_op.operand);
// 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);
return self.load(operand, tag_ty, offset);
}