Commit `e03095f167`

Andrew Kelley <andrew@ziglang.org>

2021-09-23 04:00:43

stage2: remove 2 assertions that were too aggressive

* `Type.hasCodeGenBits` this function is used to find out if it ever got sent to a linker backend for lowering. In the case that a struct never has its struct fields resolved, this will be false. In such a case, no corresponding `freeDecl` needs to be issued to the linker backend. So instead of asserting the fields of a struct are resolved, this function now returns `false` for this case. * `Module.clearDecl` there was logic that asserted when there is no outdated_decls map, any dependants of a Decl being cleared had to be in the deletion set. However there is a possible scenario where the dependant is not in the deletion set *yet* because there is a Decl which depends on it, about to be deleted. If it were added to an outdated_decls map, it would be subsequently removed from the map when it gets deleted recursively through its dependency being deleted. These issues were uncovered via unrelated changes which are the two commits immediately preceding this one.

master

1 parent d866787

Changed files (2)

src

Module.zig

type.zig

@@ -3758,13 +3758,6 @@ pub fn clearDecl(
         dep.removeDependency(decl);
         if (outdated_decls) |map| {
             map.putAssumeCapacity(dep, {});
-        } else if (std.debug.runtime_safety) {
-            // If `outdated_decls` is `null`, it means we're being called from
-            // `Compilation` after `performAllTheWork` and we cannot queue up any
-            // more work. `dep` must necessarily be another Decl that is no longer
-            // being referenced, and will be in the `deletion_set`. Otherwise,
-            // something has gone wrong.
-            assert(mod.deletion_set.contains(dep));
         }
     }
     decl.dependants.clearRetainingCapacity();

@@ -1336,6 +1336,8 @@ pub const Type = extern union {
         }
     }
 
+    /// For structs and unions, if the type does not have their fields resolved
+    /// this will return `false`.
     pub fn hasCodeGenBits(self: Type) bool {
         return switch (self.tag()) {
             .u1,
@@ -1400,14 +1402,10 @@ pub const Type = extern union {
             => true,
 
             .@"struct" => {
-                // TODO introduce lazy value mechanism
                 const struct_obj = self.castTag(.@"struct").?.data;
                 if (struct_obj.known_has_bits) {
                     return true;
                 }
-                assert(struct_obj.status == .have_field_types or
-                    struct_obj.status == .layout_wip or
-                    struct_obj.status == .have_layout);
                 for (struct_obj.fields.values()) |value| {
                     if (value.ty.hasCodeGenBits())
                         return true;

Commit e03095f167

Commit `e03095f167`