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Fix MallocSizeOf for TypedSize2D.

TypedSize2D's MallocSizeOf impl has two problems.

- It measures `width` twice, and `height` not at all.

- It erroneously asserts that `width` and `height` are scalars. This
  seems reasonable at first blush, but Stylo uses
  `BorderRadius<LengthAndPercentage>` which contains a
  `TypedSize2D<LengthAndPercentage, UnknownUnit>`, and
  `LengthAndPercentage` is non-scalar.

This patch fixes both of these problems, and also removes a low-value
`use` statement.
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nnethercote committed Sep 20, 2017
1 parent 6a791cd commit eeed0b17eb21a5825ae4d454ee14fc824ce11eb4
Showing with 2 additions and 5 deletions.
  1. +2 −5 components/malloc_size_of/
@@ -64,7 +64,6 @@ extern crate servo_arc;
extern crate smallbitvec;
extern crate smallvec;

use euclid::TypedSize2D;
use servo_arc::Arc;
use smallvec::{Array, SmallVec};
use std::hash::{BuildHasher, Hash};
@@ -391,11 +390,9 @@ impl MallocSizeOf for smallbitvec::SmallBitVec {

impl<T: MallocSizeOf, U> MallocSizeOf for TypedSize2D<T, U> {
impl<T: MallocSizeOf, U> MallocSizeOf for euclid::TypedSize2D<T, U> {
fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
let n = self.width.size_of(ops) + self.width.size_of(ops);
assert!(n == 0); // It would be very strange to have a non-zero value here...
self.width.size_of(ops) + self.height.size_of(ops)

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