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DOM structs embed their parent type as their first field. This
introduces a `.parent()` method to the DOM struct that returns its first
field, and codegens a type assert that ensures that `.parent()` returns
the parent struct.
This generates:
On `#[dom_struct]`:
```rust
impl HasParent for Type {
type Parent = ParentType;
fn as_parent(&self) -> ParentType {
&self.first_field
}
}
```
In the codegen files:
```rust
impl Type {
fn __assert_parent_type(&self) {
let _: &ParentType = self.as_parent();
}
}
````
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Fixes https://github.com/servo/servo/issues/20844
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This reverts commit 46ad8110172cfc9d8d420e8eb41863f3d394e24d.
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Servo currently uses `heapsize`, but Stylo/Gecko use `malloc_size_of`.
`malloc_size_of` is better -- it handles various cases that `heapsize` does not
-- so this patch changes Servo to use `malloc_size_of`.
This patch makes the following changes to the `malloc_size_of` crate.
- Adds `MallocSizeOf` trait implementations for numerous types, some built-in
(e.g. `VecDeque`), some external and Servo-only (e.g. `string_cache`).
- Makes `enclosing_size_of_op` optional, because vanilla jemalloc doesn't
support that operation.
- For `HashSet`/`HashMap`, falls back to a computed estimate when
`enclosing_size_of_op` isn't available.
- Adds an extern "C" `malloc_size_of` function that does the actual heap
measurement; this is based on the same functions from the `heapsize` crate.
This patch makes the following changes elsewhere.
- Converts all the uses of `heapsize` to instead use `malloc_size_of`.
- Disables the "heapsize"/"heap_size" feature for the external crates that
provide it.
- Removes the `HeapSizeOf` implementation from `hashglobe`.
- Adds `ignore` annotations to a few `Rc`/`Arc`, because `malloc_size_of`
doesn't derive those types, unlike `heapsize`.
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Before:
```
error[E0412]: cannot find type `SourceBuffer` in this scope
--> /Users/nox/src/servo/components/script/dom/mediasource.rs:25:1
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25 | #[dom_struct]
| ^^^^^^^^^^^^^ did you mean `SourceBufferList`?
```
After:
```
error[E0412]: cannot find type `SourceBuffer` in this scope
--> /Users/nox/src/servo/components/script/dom/mediasource.rs:28:39
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28 | source_buffers: DOMRefCell<Vec<JS<SourceBuffer>>>,
| ^^^^^^^^^^^^ did you mean `SourceBufferList`?
```
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