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Refactor the main cfg_if in backends.rs #808

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bushrat011899 wants to merge 2 commits into from
+145 −77
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Refactor the main cfg_if in backends.rs #808

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d3a8297
Refactor backends.rs
bushrat011899 Feb 11, 2026
67038b8
Fix a couple of commas
bushrat011899 Feb 11, 2026
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222 changes: 145 additions & 77 deletions src/backends.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,9 +35,45 @@ cfg_if! {
} else if #[cfg(getrandom_backend = "extern_impl")] {
pub(crate) mod extern_impl;
pub use extern_impl::*;
} else if #[cfg(all(target_os = "linux", target_env = ""))] {
mod linux_raw;
pub use linux_raw::*;
} else if #[cfg(target_os = "linux")] {
cfg_if! {
if #[cfg(target_env = "")] {
mod linux_raw;
pub use linux_raw::*;
} else if #[cfg(
// Only on these `target_arch`es Rust supports Linux kernel versions (3.2+)
// that precede the version (3.17) in which `getrandom(2)` was added:
// https://doc.rust-lang.org/stable/rustc/platform-support.html
any(
target_arch = "aarch64",
target_arch = "arm",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "s390x",
target_arch = "x86",
target_arch = "x86_64",
// Minimum supported Linux kernel version for MUSL targets
// is not specified explicitly (as of Rust 1.77) and they
// are used in practice to target pre-3.17 kernels.
all(
target_env = "musl",
not(
any(
target_arch = "riscv64",
target_arch = "riscv32",
),
),
),
)
)] {
mod use_file;
mod linux_android_with_fallback;
pub use linux_android_with_fallback::*;
} else {
mod getrandom;
pub use getrandom::*;
}
}
} else if #[cfg(target_os = "espidf")] {
mod esp_idf;
pub use esp_idf::*;
Expand All @@ -57,68 +93,61 @@ cfg_if! {
))] {
mod getentropy;
pub use getentropy::*;
} else if #[cfg(target_os = "android")] {
cfg_if! {
if #[cfg(
// Rust supports Android API level 19 (KitKat) [0] and the next upgrade targets
// level 21 (Lollipop) [1], while `getrandom(2)` was added only in
// level 23 (Marshmallow). Note that it applies only to the "old" `target_arch`es,
// RISC-V Android targets sufficiently new API level, same will apply for potential
// new Android `target_arch`es.
// [0]: https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html
// [1]: https://github.com/rust-lang/rust/pull/120593
any(
target_arch = "aarch64",
target_arch = "arm",
target_arch = "x86",
target_arch = "x86_64",
)
)] {
mod use_file;
mod linux_android_with_fallback;
pub use linux_android_with_fallback::*;
} else {
mod getrandom;
pub use getrandom::*;
}
}
} else if #[cfg(any(
// Rust supports Android API level 19 (KitKat) [0] and the next upgrade targets
// level 21 (Lollipop) [1], while `getrandom(2)` was added only in
// level 23 (Marshmallow). Note that it applies only to the "old" `target_arch`es,
// RISC-V Android targets sufficiently new API level, same will apply for potential
// new Android `target_arch`es.
// [0]: https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html
// [1]: https://github.com/rust-lang/rust/pull/120593
all(
target_os = "android",
any(
target_arch = "aarch64",
target_arch = "arm",
target_arch = "x86",
target_arch = "x86_64",
),
),
// Only on these `target_arch`es Rust supports Linux kernel versions (3.2+)
// that precede the version (3.17) in which `getrandom(2)` was added:
// https://doc.rust-lang.org/stable/rustc/platform-support.html
all(
target_os = "linux",
any(
target_arch = "aarch64",
target_arch = "arm",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "s390x",
target_arch = "x86",
target_arch = "x86_64",
// Minimum supported Linux kernel version for MUSL targets
// is not specified explicitly (as of Rust 1.77) and they
// are used in practice to target pre-3.17 kernels.
all(
target_env = "musl",
not(
any(
target_arch = "riscv64",
target_arch = "riscv32",
),
),
),
),
)
))] {
mod use_file;
mod linux_android_with_fallback;
pub use linux_android_with_fallback::*;
} else if #[cfg(any(
target_os = "android",
target_os = "linux",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "hurd",
target_os = "illumos",
target_os = "cygwin",
// Check for target_arch = "arm" to only include the 3DS. Does not
// include the Nintendo Switch (which is target_arch = "aarch64").
all(target_os = "horizon", target_arch = "arm"),
))] {
mod getrandom;
pub use getrandom::*;
} else if #[cfg(target_os = "horizon")] {
cfg_if! {
// Check for target_arch = "arm" to only include the 3DS. Does not
// include the Nintendo Switch (which is target_arch = "aarch64")
if #[cfg(target_arch = "arm")] {
mod getrandom;
pub use getrandom::*;
} else if #[cfg(target_arch = "aarch64")] {
compile_error!(concat!(
"The horizon operating system is not supported by default on the Nintendo Switch; \
You may need to define a custom backend see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#custom-backend"
));
} else {
compile_error!(concat!(
"The horizon operating system is only supported by default on the 3DS; \
You may need to define a custom backend see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#custom-backend"
));
}
}
} else if #[cfg(target_os = "solaris")] {
mod solaris;
pub use solaris::*;
Expand All @@ -136,7 +165,7 @@ cfg_if! {
))] {
mod apple_other;
pub use apple_other::*;
} else if #[cfg(all(target_arch = "wasm32", target_os = "wasi"))] {
} else if #[cfg(target_os = "wasi")] {
cfg_if! {
if #[cfg(target_env = "p1")] {
mod wasi_p1;
Expand All @@ -149,35 +178,74 @@ cfg_if! {
} else if #[cfg(target_os = "hermit")] {
mod hermit;
pub use hermit::*;
} else if #[cfg(all(target_arch = "x86_64", target_os = "motor"))] {
mod rdrand;
pub use rdrand::*;
} else if #[cfg(target_os = "motor")] {
cfg_if! {
if #[cfg(target_arch = "x86_64")] {
mod rdrand;
pub use rdrand::*;
} else {
compile_error!(concat!(
"The motor operating system is only supported by default on x86_64; \
You may need to define a custom backend see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#custom-backend"
));
}
}
} else if #[cfg(target_os = "vxworks")] {
mod vxworks;
pub use vxworks::*;
} else if #[cfg(target_os = "solid_asp3")] {
mod solid;
pub use solid::*;
} else if #[cfg(all(windows, target_vendor = "win7"))] {
mod windows_legacy;
pub use windows_legacy::*;
} else if #[cfg(windows)] {
mod windows;
pub use windows::*;
} else if #[cfg(all(target_arch = "x86_64", target_env = "sgx"))] {
mod rdrand;
pub use rdrand::*;
} else if #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))] {
} else if #[cfg(target_os = "windows")] {
cfg_if! {
if #[cfg(target_vendor = "win7")] {
mod windows_legacy;
pub use windows_legacy::*;
} else {
mod windows;
pub use windows::*;
}
}
} else if #[cfg(target_os = "uefi")] {
compile_error!(concat!(
"UEFI is not supported by default; \
Consider enabling the efi_rng backend see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#opt-in-backends"
));
} else if #[cfg(any(
target_os = "unknown",
target_os = "none"
))] {
cfg_if! {
if #[cfg(feature = "wasm_js")] {
mod wasm_js;
pub use wasm_js::*;
if #[cfg(any(
target_arch = "x86",
target_arch = "x86_64",
))] {
mod rdrand;
pub use rdrand::*;
} else if #[cfg(target_arch = "aarch64")] {
mod rndr;
pub use rndr::*;
} else if #[cfg(target_arch = "wasm32")] {
cfg_if! {
if #[cfg(feature = "wasm_js")] {
mod wasm_js;
pub use wasm_js::*;
} else {
compile_error!(concat!(
"The wasm32-unknown-unknown targets are not supported by default; \
you may need to enable the \"wasm_js\" crate feature. \
For more information see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#webassembly-support"
));
}
}
} else {
compile_error!(concat!(
"The wasm32-unknown-unknown targets are not supported by default; \
you may need to enable the \"wasm_js\" crate feature. \
For more information see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#webassembly-support"
"Architecture is not supported by default without a supported operating system; \
You may need to define a custom backend see: \
https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#custom-backend"
));
}
}
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