Commit 1c223819098e5621e2e5ad526879cd33852144e1 | zig

author	Cody Tapscott <topolarity@tapscott.me> 2022-03-22 23:07:46-07:00
committer	Andrew Kelley <andrew@ziglang.org> 2022-03-23 13:44:31-07:00
log	1c223819098e5621e2e5ad526879cd33852144e1
tree	1e472eb0497e45fcc3c888815cf26a0ec71f33d3
parent	b872539a13ac46abe57a59bafdf5392812468482

stage2: Properly "flatten" elem_ptrs before deref

Sema.pointerDeref() assumes that elem_ptrs have been "flattened" when
they were created, so that you an elem_ptr will never be the array_ptr
of another elem_ptr when they share the same type.

Value.elemPtr does this already, but a couple of places in Sema were
bypassing this logic.

1 files changed, 3 insertions(+), 16 deletions(-)

src
- Sema.zig

src/Sema.zig+3-16

 @@ -17045,17 +17045,9 @@ fn elemVal(
                     const indexable_val = maybe_indexable_val orelse break :rs indexable_src;
                     const index_val = maybe_index_val orelse break :rs elem_index_src;
                     const index = @intCast(usize, index_val.toUnsignedInt(target));
-                    const elem_ty = indexable_ty.elemType2();
+                    const elem_ptr_val = try indexable_val.elemPtr(indexable_ty, sema.arena, index, target);
-                    var payload: Value.Payload.ElemPtr = .{ .data = .{
-                        .array_ptr = indexable_val,
-                        .elem_ty = elem_ty,
-                        .index = index,
-                    } };
-                    const elem_ptr_val = Value.initPayload(&payload.base);
                     if (try sema.pointerDeref(block, indexable_src, elem_ptr_val, indexable_ty)) |elem_val| {
-                        return sema.addConstant(elem_ty, elem_val);
+                        return sema.addConstant(indexable_ty.elemType2(), elem_val);
                     }
                     break :rs indexable_src;
                 };
 @@ -17310,12 +17302,7 @@ fn elemValSlice(
                 const sentinel_label: []const u8 = if (slice_sent) " +1 (sentinel)" else "";
                 return sema.fail(block, elem_index_src, "index {d} outside slice of length {d}{s}", .{ index, slice_len, sentinel_label });
             }
-            var elem_ptr_pl: Value.Payload.ElemPtr = .{ .data = .{
+            const elem_ptr_val = try slice_val.elemPtr(slice_ty, sema.arena, index, target);
-                .array_ptr = slice_val.slicePtr(),
-                .elem_ty = elem_ty,
-                .index = index,
-            } };
-            const elem_ptr_val = Value.initPayload(&elem_ptr_pl.base);
             if (try sema.pointerDeref(block, slice_src, elem_ptr_val, slice_ty)) |elem_val| {
                 return sema.addConstant(elem_ty, elem_val);
             }