Replace all uses of the heapsize crate with malloc_size_of.

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`.

components/msg/Cargo.toml

@@ -14,8 +14,8 @@ unstable = ["nonzero/unstable"]
 
 [dependencies]
 bitflags = "0.7"
-heapsize = "0.4"
-heapsize_derive = "0.1"
+malloc_size_of = { path = "../malloc_size_of" }
+malloc_size_of_derive = { path = "../malloc_size_of_derive" }
 nonzero = {path = "../nonzero"}
 serde = "1.0.14"
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}

components/msg/constellation_msg.rs

@@ -18,7 +18,7 @@ pub enum KeyState {
 }
 
 //N.B. Based on the glutin key enum
-#[derive(Clone, Copy, Debug, Deserialize, Eq, HeapSizeOf, PartialEq, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, MallocSizeOf, PartialEq, Serialize)]
 pub enum Key {
     Space,
     Apostrophe,
@@ -217,14 +217,14 @@ impl PipelineNamespace {
 
 thread_local!(pub static PIPELINE_NAMESPACE: Cell<Option<PipelineNamespace>> = Cell::new(None));
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
 pub struct PipelineNamespaceId(pub u32);
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
 pub struct PipelineIndex(pub NonZero<u32>);
-known_heap_size!(0, PipelineIndex);
+malloc_size_of_is_0!(PipelineIndex);
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
 pub struct PipelineId {
     pub namespace_id: PipelineNamespaceId,
     pub index: PipelineIndex
@@ -276,9 +276,9 @@ impl fmt::Display for PipelineId {
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
 pub struct BrowsingContextIndex(pub NonZero<u32>);
-known_heap_size!(0, BrowsingContextIndex);
+malloc_size_of_is_0!(BrowsingContextIndex);
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
 pub struct BrowsingContextId {
     pub namespace_id: PipelineNamespaceId,
     pub index: BrowsingContextIndex,
@@ -305,7 +305,7 @@ impl fmt::Display for BrowsingContextId {
 
 thread_local!(pub static TOP_LEVEL_BROWSING_CONTEXT_ID: Cell<Option<TopLevelBrowsingContextId>> = Cell::new(None));
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
 pub struct TopLevelBrowsingContextId(BrowsingContextId);
 
 impl TopLevelBrowsingContextId {
@@ -362,7 +362,7 @@ pub const TEST_BROWSING_CONTEXT_INDEX: BrowsingContextIndex =
 pub const TEST_BROWSING_CONTEXT_ID: BrowsingContextId =
     BrowsingContextId { namespace_id: TEST_NAMESPACE, index: TEST_BROWSING_CONTEXT_INDEX };
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, PartialEq, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, PartialEq, Serialize)]
 pub enum FrameType {
     IFrame,
     MozBrowserIFrame,

components/msg/lib.rs

@@ -6,8 +6,8 @@
 
 #[macro_use]
 extern crate bitflags;
-#[macro_use] extern crate heapsize;
-#[macro_use] extern crate heapsize_derive;
+#[macro_use] extern crate malloc_size_of;
+#[macro_use] extern crate malloc_size_of_derive;
 extern crate nonzero;
 #[macro_use] extern crate serde;
 extern crate webrender_api;