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Replace debug asserts with static_assertions

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To check that transmutes will work correctly without having to rely on
error-prone runtime checking, the `static_assertions` crate has been
introduced. This allows comparing the size of types at compile time,
preventing potentially silent breakage.

This fixes #1417.
This commit is contained in:
Christian Duerr 2018-07-05 23:05:33 +00:00 committed by GitHub
parent 68b3d8abfd
commit 7433f45ff9
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4 changed files with 10 additions and 1 deletions
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7
Cargo.lock generated
View file

@ -33,6 +33,7 @@ dependencies = [
"serde_derive 1.0.66 (registry+https://github.com/rust-lang/crates.io-index)",
"serde_json 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
"serde_yaml 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)",
"static_assertions 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
"unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
"vte 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
"x11-dl 2.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
@ -966,6 +967,11 @@ name = "stable_deref_trait"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "static_assertions"
version = "0.2.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "strsim"
version = "0.7.0"
@ -1361,6 +1367,7 @@ dependencies = [
"checksum smallvec 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "03dab98ab5ded3a8b43b2c80751194608d0b2aa0f1d46cf95d1c35e192844aa7"
"checksum smithay-client-toolkit 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "84c45607482d31161951f4ea11ba2673e3999e1cc6ca2d50a72eaee7eae3cbf1"
"checksum stable_deref_trait 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ffbc596e092fe5f598b12ef46cc03754085ac2f4d8c739ad61c4ae266cc3b3fa"
"checksum static_assertions 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c19be23126415861cb3a23e501d34a708f7f9b2183c5252d690941c2e69199d5"
"checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
"checksum syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c67da57e61ebc7b7b6fff56bb34440ca3a83db037320b0507af4c10368deda7d"
"checksum tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "47776f63b85777d984a50ce49d6b9e58826b6a3766a449fc95bc66cd5663c15b"

1
Cargo.toml
View file

@ -36,6 +36,7 @@ arraydeque = "0.4"
glutin = "0.16"
env_logger = "0.5"
base64 = "0.9.0"
static_assertions = "0.2.5"
[target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))'.dependencies]
x11-dl = "2"

2
src/input.rs
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@ -137,7 +137,7 @@ impl<T> Binding<T> {
/// Optimized to use single check instead of four (one per modifier)
#[inline]
fn mods_match(&self, mods: ModifiersState) -> bool {
debug_assert!(4 == mem::size_of::<ModifiersState>());
assert_eq_size!(ModifiersState, u32);
unsafe {
mem::transmute_copy::<_, u32>(&self.mods) == mem::transmute_copy::<_, u32>(&mods)
}

1
src/lib.rs
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@ -21,6 +21,7 @@
#[macro_use] extern crate clap;
#[macro_use] extern crate log;
#[macro_use] extern crate serde_derive;
#[macro_use] extern crate static_assertions;
#[cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))]
extern crate x11_dl;