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Replace debug asserts with static_assertions
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.
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4 changed files with 10 additions and 1 deletions
7
Cargo.lock
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7
Cargo.lock
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@ -33,6 +33,7 @@ dependencies = [
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"serde_derive 1.0.66 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde_json 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde_yaml 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)",
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"static_assertions 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
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"unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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"vte 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"x11-dl 2.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -966,6 +967,11 @@ name = "stable_deref_trait"
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version = "1.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "static_assertions"
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version = "0.2.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "strsim"
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version = "0.7.0"
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@ -1361,6 +1367,7 @@ dependencies = [
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"checksum smallvec 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "03dab98ab5ded3a8b43b2c80751194608d0b2aa0f1d46cf95d1c35e192844aa7"
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"checksum smithay-client-toolkit 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "84c45607482d31161951f4ea11ba2673e3999e1cc6ca2d50a72eaee7eae3cbf1"
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"checksum stable_deref_trait 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ffbc596e092fe5f598b12ef46cc03754085ac2f4d8c739ad61c4ae266cc3b3fa"
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"checksum static_assertions 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c19be23126415861cb3a23e501d34a708f7f9b2183c5252d690941c2e69199d5"
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"checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
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"checksum syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c67da57e61ebc7b7b6fff56bb34440ca3a83db037320b0507af4c10368deda7d"
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"checksum tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "47776f63b85777d984a50ce49d6b9e58826b6a3766a449fc95bc66cd5663c15b"
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@ -36,6 +36,7 @@ arraydeque = "0.4"
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glutin = "0.16"
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env_logger = "0.5"
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base64 = "0.9.0"
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static_assertions = "0.2.5"
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[target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))'.dependencies]
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x11-dl = "2"
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@ -137,7 +137,7 @@ impl<T> Binding<T> {
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/// Optimized to use single check instead of four (one per modifier)
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#[inline]
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fn mods_match(&self, mods: ModifiersState) -> bool {
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debug_assert!(4 == mem::size_of::<ModifiersState>());
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assert_eq_size!(ModifiersState, u32);
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unsafe {
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mem::transmute_copy::<_, u32>(&self.mods) == mem::transmute_copy::<_, u32>(&mods)
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}
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@ -21,6 +21,7 @@
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#[macro_use] extern crate clap;
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#[macro_use] extern crate log;
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#[macro_use] extern crate serde_derive;
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#[macro_use] extern crate static_assertions;
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#[cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))]
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extern crate x11_dl;
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