diff options
Diffstat (limited to 'vendor/portable-atomic/build.rs')
| -rw-r--r-- | vendor/portable-atomic/build.rs | 448 |
1 files changed, 0 insertions, 448 deletions
diff --git a/vendor/portable-atomic/build.rs b/vendor/portable-atomic/build.rs deleted file mode 100644 index 0ceb038..0000000 --- a/vendor/portable-atomic/build.rs +++ /dev/null @@ -1,448 +0,0 @@ -// SPDX-License-Identifier: Apache-2.0 OR MIT - -// The rustc-cfg emitted by the build script are *not* public API. - -#![allow(clippy::match_same_arms, clippy::needless_pass_by_value)] - -#[path = "version.rs"] -mod version; -use version::{rustc_version, Version}; - -use std::{env, str}; - -include!("no_atomic.rs"); - -fn main() { - println!("cargo:rerun-if-changed=build.rs"); - println!("cargo:rerun-if-changed=no_atomic.rs"); - println!("cargo:rerun-if-changed=version.rs"); - - #[cfg(feature = "unsafe-assume-single-core")] - println!("cargo:rustc-cfg=portable_atomic_unsafe_assume_single_core"); - #[cfg(feature = "s-mode")] - println!("cargo:rustc-cfg=portable_atomic_s_mode"); - #[cfg(feature = "force-amo")] - println!("cargo:rustc-cfg=portable_atomic_force_amo"); - #[cfg(feature = "disable-fiq")] - println!("cargo:rustc-cfg=portable_atomic_disable_fiq"); - - let target = &*env::var("TARGET").expect("TARGET not set"); - let target_arch = &*env::var("CARGO_CFG_TARGET_ARCH").expect("CARGO_CFG_TARGET_ARCH not set"); - let target_os = &*env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS not set"); - // HACK: If --target is specified, rustflags is not applied to the build - // script itself, so the build script will not be rerun when these are changed. - // - // Ideally, the build script should be rebuilt when CARGO_ENCODED_RUSTFLAGS - // is changed, but since it is an environment variable set by cargo, - // as of 1.62.0-nightly, specifying it as rerun-if-env-changed does not work. - println!("cargo:rerun-if-env-changed=CARGO_ENCODED_RUSTFLAGS"); - println!("cargo:rerun-if-env-changed=RUSTFLAGS"); - println!("cargo:rerun-if-env-changed=CARGO_BUILD_RUSTFLAGS"); - let mut target_upper = target.replace(|c: char| c == '-' || c == '.', "_"); - target_upper.make_ascii_uppercase(); - println!("cargo:rerun-if-env-changed=CARGO_TARGET_{}_RUSTFLAGS", target_upper); - - let version = match rustc_version() { - Some(version) => version, - None => { - println!( - "cargo:warning={}: unable to determine rustc version; assuming latest stable rustc (1.{})", - env!("CARGO_PKG_NAME"), - Version::LATEST.minor - ); - Version::LATEST - } - }; - - // Note that this is `no_`*, not `has_*`. This allows treating as the latest - // stable rustc is used when the build script doesn't run. This is useful - // for non-cargo build systems that don't run the build script. - // atomic_min_max stabilized in Rust 1.45 (nightly-2020-05-30): https://github.com/rust-lang/rust/pull/72324 - if !version.probe(45, 2020, 5, 29) { - println!("cargo:rustc-cfg=portable_atomic_no_atomic_min_max"); - } - // track_caller stabilized in Rust 1.46 (nightly-2020-07-02): https://github.com/rust-lang/rust/pull/72445 - if !version.probe(46, 2020, 7, 1) { - println!("cargo:rustc-cfg=portable_atomic_no_track_caller"); - } - // unsafe_op_in_unsafe_fn stabilized in Rust 1.52 (nightly-2021-03-11): https://github.com/rust-lang/rust/pull/79208 - if !version.probe(52, 2021, 3, 10) { - println!("cargo:rustc-cfg=portable_atomic_no_unsafe_op_in_unsafe_fn"); - } - // https://github.com/rust-lang/rust/pull/84662 merged in Rust 1.56 (nightly-2021-08-02). - if !version.probe(56, 2021, 8, 1) { - println!("cargo:rustc-cfg=portable_atomic_no_core_unwind_safe"); - } - // const_raw_ptr_deref stabilized in Rust 1.58 (nightly-2021-11-15): https://github.com/rust-lang/rust/pull/89551 - if !version.probe(58, 2021, 11, 14) { - println!("cargo:rustc-cfg=portable_atomic_no_const_raw_ptr_deref"); - } - // https://github.com/rust-lang/rust/pull/98383 merged in Rust 1.64 (nightly-2022-07-19). - if !version.probe(64, 2022, 7, 18) { - println!("cargo:rustc-cfg=portable_atomic_no_stronger_failure_ordering"); - } - // https://github.com/rust-lang/rust/pull/114790 merged in nightly-2023-08-24 - if !version.probe(74, 2023, 8, 23) { - println!("cargo:rustc-cfg=portable_atomic_no_asm_maybe_uninit"); - } - - // asm stabilized in Rust 1.59 (nightly-2021-12-16): https://github.com/rust-lang/rust/pull/91728 - let no_asm = !version.probe(59, 2021, 12, 15); - if no_asm { - if version.nightly - && version.probe(46, 2020, 6, 20) - && ((target_arch != "x86" && target_arch != "x86_64") || version.llvm >= 10) - && is_allowed_feature("asm") - { - // This feature was added in Rust 1.45 (nightly-2020-05-20), but - // concat! in asm! requires Rust 1.46 (nightly-2020-06-21). - // x86 intel syntax requires LLVM 10 (since Rust 1.53, the minimum - // external LLVM version is 10+: https://github.com/rust-lang/rust/pull/83387). - // The part of this feature we use has not been changed since nightly-2020-06-21 - // until it was stabilized in nightly-2021-12-16, so it can be safely enabled in - // nightly, which is older than nightly-2021-12-16. - println!("cargo:rustc-cfg=portable_atomic_unstable_asm"); - } - println!("cargo:rustc-cfg=portable_atomic_no_asm"); - } - - // feature(cfg_target_has_atomic) stabilized in Rust 1.60 (nightly-2022-02-11): https://github.com/rust-lang/rust/pull/93824 - if !version.probe(60, 2022, 2, 10) { - if version.nightly - && version.probe(40, 2019, 10, 13) - && is_allowed_feature("cfg_target_has_atomic") - { - // This feature has not been changed since the change in Rust 1.40 (nightly-2019-10-14) - // until it was stabilized in nightly-2022-02-11, so it can be safely enabled in - // nightly, which is older than nightly-2022-02-11. - println!("cargo:rustc-cfg=portable_atomic_unstable_cfg_target_has_atomic"); - } else { - println!("cargo:rustc-cfg=portable_atomic_no_cfg_target_has_atomic"); - let target = &*convert_custom_linux_target(target); - if NO_ATOMIC_CAS.contains(&target) { - println!("cargo:rustc-cfg=portable_atomic_no_atomic_cas"); - } - if NO_ATOMIC_64.contains(&target) { - println!("cargo:rustc-cfg=portable_atomic_no_atomic_64"); - } else { - // Otherwise, assuming `"max-atomic-width" == 64` or `"max-atomic-width" == 128`. - } - } - } - // We don't need to use convert_custom_linux_target here because all linux targets have atomics. - if NO_ATOMIC.contains(&target) { - println!("cargo:rustc-cfg=portable_atomic_no_atomic_load_store"); - } - - if version.llvm >= 16 { - println!("cargo:rustc-cfg=portable_atomic_llvm_16"); - } - if version.nightly { - // `cfg(sanitize = "..")` is not stabilized. - let sanitize = env::var("CARGO_CFG_SANITIZE").unwrap_or_default(); - if sanitize.contains("thread") { - // Most kinds of sanitizers are not compatible with asm - // (https://github.com/google/sanitizers/issues/192), - // but it seems that ThreadSanitizer is the only one that can cause - // false positives in our code. - println!("cargo:rustc-cfg=portable_atomic_sanitize_thread"); - } - - // https://github.com/rust-lang/rust/pull/93868 merged in Rust 1.60 (nightly-2022-02-13). - // https://github.com/rust-lang/rust/pull/111331 merged in Rust 1.71 (nightly-2023-05-09). - if !no_asm - && (target_arch == "powerpc64" && version.probe(60, 2022, 2, 12) - || target_arch == "s390x" && version.probe(71, 2023, 5, 8)) - && is_allowed_feature("asm_experimental_arch") - { - println!("cargo:rustc-cfg=portable_atomic_unstable_asm_experimental_arch"); - } - } - - let is_macos = target_os == "macos"; - let is_apple = is_macos || target_os == "ios" || target_os == "tvos" || target_os == "watchos"; - match target_arch { - "x86_64" => { - // cmpxchg16b_target_feature stabilized in Rust 1.69 (nightly-2023-03-01): https://github.com/rust-lang/rust/pull/106774 - if !version.probe(69, 2023, 2, 28) { - if version.nightly && is_allowed_feature("cmpxchg16b_target_feature") { - // This feature has not been changed since 1.33 - // (https://github.com/rust-lang/rust/commit/fbb56bcf44d28e65a9495decf091b6d0386e540c) - // until it was stabilized in nightly-2023-03-01, so it can be safely enabled in - // nightly, which is older than nightly-2023-03-01. - println!("cargo:rustc-cfg=portable_atomic_unstable_cmpxchg16b_target_feature"); - } else { - println!("cargo:rustc-cfg=portable_atomic_no_cmpxchg16b_target_feature"); - } - } - // For Miri and ThreadSanitizer. - // https://github.com/rust-lang/rust/pull/109359 (includes https://github.com/rust-lang/stdarch/pull/1358) merged in Rust 1.70 (nightly-2023-03-24). - if version.nightly && !version.probe(70, 2023, 3, 23) { - println!("cargo:rustc-cfg=portable_atomic_unstable_cmpxchg16b_intrinsic"); - } - - // x86_64 Apple targets always support CMPXCHG16B: - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_target/src/spec/x86_64_apple_darwin.rs#L8 - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_target/src/spec/apple_base.rs#L69-L70 - // Script to get targets that support cmpxchg16b by default: - // $ (for target in $(rustc --print target-list); do [[ "${target}" == "x86_64"* ]] && rustc --print cfg --target "${target}" | grep -q cmpxchg16b && echo "${target}"; done) - let has_cmpxchg16b = is_apple; - // LLVM recognizes this also as cx16 target feature: https://godbolt.org/z/r8zWGcMhd - // However, it is unlikely that rustc will support that name, so we ignore it. - // cmpxchg16b_target_feature stabilized in Rust 1.69. - target_feature_if("cmpxchg16b", has_cmpxchg16b, &version, Stable(69)); - } - "aarch64" => { - // For Miri and ThreadSanitizer. - // https://github.com/rust-lang/rust/pull/97423 merged in Rust 1.64 (nightly-2022-06-30). - if version.nightly && version.probe(64, 2022, 6, 29) { - println!("cargo:rustc-cfg=portable_atomic_new_atomic_intrinsics"); - } - - // aarch64 macOS always supports FEAT_LSE and FEAT_LSE2 because it is armv8.5-a: - // https://github.com/llvm/llvm-project/blob/llvmorg-17.0.0-rc2/llvm/include/llvm/TargetParser/AArch64TargetParser.h#L494 - let mut has_lse = is_macos; - // FEAT_LSE2 doesn't imply FEAT_LSE. FEAT_LSE128 implies FEAT_LSE but not FEAT_LSE2. - // As of rustc 1.70, target_feature "lse2"/"lse128"/"rcpc3" is not available on rustc side: - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_codegen_ssa/src/target_features.rs#L58 - target_feature_if("lse2", is_macos, &version, Unavailable); - // LLVM supports FEAT_LRCPC3 and FEAT_LSE128 on LLVM 16+: - // https://github.com/llvm/llvm-project/commit/a6aaa969f7caec58a994142f8d855861cf3a1463 - // https://github.com/llvm/llvm-project/commit/7fea6f2e0e606e5339c3359568f680eaf64aa306 - has_lse |= target_feature_if("lse128", false, &version, Unavailable); - target_feature_if("rcpc3", false, &version, Unavailable); - // aarch64_target_feature stabilized in Rust 1.61. - target_feature_if("lse", has_lse, &version, Stable(61)); - - // As of Apple M1/M1 Pro, on Apple hardware, CAS loop-based RMW is much slower than LL/SC - // loop-based RMW: https://github.com/taiki-e/portable-atomic/pull/89 - if is_apple || target_cpu().map_or(false, |cpu| cpu.starts_with("apple-")) { - println!("cargo:rustc-cfg=portable_atomic_ll_sc_rmw"); - } - } - "arm" => { - // For non-Linux/Android pre-v6 ARM (tier 3) with unsafe_assume_single_core enabled. - // feature(isa_attribute) stabilized in Rust 1.67 (nightly-2022-11-06): https://github.com/rust-lang/rust/pull/102458 - if version.nightly && !version.probe(67, 2022, 11, 5) { - println!("cargo:rustc-cfg=portable_atomic_unstable_isa_attribute"); - } - - // #[cfg(target_feature = "v7")] and others don't work on stable. - // armv7-unknown-linux-gnueabihf - // ^^ - let mut subarch = - strip_prefix(target, "arm").or_else(|| strip_prefix(target, "thumb")).unwrap(); - subarch = strip_prefix(subarch, "eb").unwrap_or(subarch); // ignore endianness - subarch = subarch.split('-').next().unwrap(); // ignore vender/os/env - subarch = subarch.split('.').next().unwrap(); // ignore .base/.main suffix - let mut known = true; - // See https://github.com/taiki-e/atomic-maybe-uninit/blob/HEAD/build.rs for details - let mut is_mclass = false; - match subarch { - "v7" | "v7a" | "v7neon" | "v7s" | "v7k" | "v8a" | "v9a" => {} // aclass - "v6m" | "v7em" | "v7m" | "v8m" => is_mclass = true, - "v7r" | "v8r" => {} // rclass - // arm-linux-androideabi is v5te - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_target/src/spec/arm_linux_androideabi.rs#L11-L12 - _ if target == "arm-linux-androideabi" => subarch = "v5te", - // armeb-unknown-linux-gnueabi is v8 & aclass - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_target/src/spec/armeb_unknown_linux_gnueabi.rs#L12 - _ if target == "armeb-unknown-linux-gnueabi" => subarch = "v8", - // v6 targets other than v6m don't have *class target feature. - "" | "v6" | "v6k" => subarch = "v6", - // Other targets don't have *class target feature. - "v4t" | "v5te" => {} - _ => { - known = false; - println!( - "cargo:warning={}: unrecognized arm subarch: {}", - env!("CARGO_PKG_NAME"), - target - ); - } - } - target_feature_if("mclass", is_mclass, &version, Nightly); - let v6 = known - && (subarch.starts_with("v6") - || subarch.starts_with("v7") - || subarch.starts_with("v8") - || subarch.starts_with("v9")); - target_feature_if("v6", v6, &version, Nightly); - } - "powerpc64" => { - // For Miri and ThreadSanitizer. - if version.nightly && version.llvm >= 15 { - println!("cargo:rustc-cfg=portable_atomic_llvm_15"); - } - - let target_endian = - env::var("CARGO_CFG_TARGET_ENDIAN").expect("CARGO_CFG_TARGET_ENDIAN not set"); - // powerpc64le is pwr8+ by default - // https://github.com/llvm/llvm-project/blob/llvmorg-17.0.0-rc2/llvm/lib/Target/PowerPC/PPC.td#L663 - // See also https://github.com/rust-lang/rust/issues/59932 - let mut has_pwr8_features = target_endian == "little"; - // https://github.com/llvm/llvm-project/commit/549e118e93c666914a1045fde38a2cac33e1e445 - if let Some(cpu) = &target_cpu() { - if let Some(mut cpu_version) = strip_prefix(cpu, "pwr") { - cpu_version = strip_suffix(cpu_version, "x").unwrap_or(cpu_version); // for pwr5x and pwr6x - if let Ok(cpu_version) = cpu_version.parse::<u32>() { - has_pwr8_features = cpu_version >= 8; - } - } else { - // https://github.com/llvm/llvm-project/blob/llvmorg-17.0.0-rc2/llvm/lib/Target/PowerPC/PPC.td#L663 - // https://github.com/llvm/llvm-project/blob/llvmorg-17.0.0-rc2/llvm/lib/Target/PowerPC/PPC.td#L445-L447 - has_pwr8_features = cpu == "ppc64le" || cpu == "future"; - } - } - // Note: As of rustc 1.70, target_feature "quadword-atomics" is not available on rustc side: - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_codegen_ssa/src/target_features.rs#L226 - // lqarx and stqcx. - target_feature_if("quadword-atomics", has_pwr8_features, &version, Unavailable); - } - "s390x" => { - // https://github.com/llvm/llvm-project/blob/llvmorg-17.0.0-rc2/llvm/lib/Target/SystemZ/SystemZFeatures.td - let mut arch9_features = false; // z196+ - let mut arch13_features = false; // z15+ - if let Some(cpu) = target_cpu() { - // https://github.com/llvm/llvm-project/blob/llvmorg-17.0.0-rc2/llvm/lib/Target/SystemZ/SystemZProcessors.td - match &*cpu { - "arch9" | "z196" | "arch10" | "zEC12" | "arch11" | "z13" | "arch12" | "z14" => { - arch9_features = true; - } - "arch13" | "z15" | "arch14" | "z16" => { - arch9_features = true; - arch13_features = true; - } - _ => {} - } - } - // Note: As of rustc 1.70, target_feature "fast-serialization"/"load-store-on-cond"/"distinct-ops"/"miscellaneous-extensions-3" is not available on rustc side: - // https://github.com/rust-lang/rust/blob/1.70.0/compiler/rustc_codegen_ssa/src/target_features.rs - // bcr 14,0 - target_feature_if("fast-serialization", arch9_features, &version, Unavailable); - // {l,st}oc{,g}{,r} - target_feature_if("load-store-on-cond", arch9_features, &version, Unavailable); - // {al,sl,n,o,x}{,g}rk - target_feature_if("distinct-ops", arch9_features, &version, Unavailable); - // nand (nnr{,g}k), select (sel{,g}r), etc. - target_feature_if("miscellaneous-extensions-3", arch13_features, &version, Unavailable); - } - _ => {} - } -} - -enum Availability { - Stable(u32), - Nightly, - Unavailable, -} -use Availability::{Nightly, Stable, Unavailable}; - -fn target_feature_if( - name: &str, - mut has_target_feature: bool, - version: &Version, - availability: Availability, -) -> bool { - // HACK: Currently, it seems that the only way to handle unstable target - // features on the stable is to parse the `-C target-feature` in RUSTFLAGS. - // - // - #[cfg(target_feature = "unstable_target_feature")] doesn't work on stable. - // - CARGO_CFG_TARGET_FEATURE excludes unstable target features on stable. - // - // As mentioned in the [RFC2045], unstable target features are also passed to LLVM - // (e.g., https://godbolt.org/z/TfaEx95jc), so this hack works properly on stable. - // - // [RFC2045]: https://rust-lang.github.io/rfcs/2045-target-feature.html#backend-compilation-options - match availability { - // In these cases, cfg(target_feature = "...") would work, so skip emitting our own target_feature cfg. - Availability::Stable(stabilized) if version.nightly || version.minor >= stabilized => { - return false - } - Availability::Nightly if version.nightly => return false, - _ => {} - } - if let Some(rustflags) = env::var_os("CARGO_ENCODED_RUSTFLAGS") { - for mut flag in rustflags.to_string_lossy().split('\x1f') { - flag = strip_prefix(flag, "-C").unwrap_or(flag); - if let Some(flag) = strip_prefix(flag, "target-feature=") { - for s in flag.split(',') { - // TODO: Handles cases where a specific target feature - // implicitly enables another target feature. - match (s.as_bytes().first(), s.as_bytes().get(1..)) { - (Some(b'+'), Some(f)) if f == name.as_bytes() => has_target_feature = true, - (Some(b'-'), Some(f)) if f == name.as_bytes() => has_target_feature = false, - _ => {} - } - } - } - } - } - if has_target_feature { - println!("cargo:rustc-cfg=portable_atomic_target_feature=\"{}\"", name); - } - has_target_feature -} - -fn target_cpu() -> Option<String> { - let rustflags = env::var_os("CARGO_ENCODED_RUSTFLAGS")?; - let rustflags = rustflags.to_string_lossy(); - let mut cpu = None; - for mut flag in rustflags.split('\x1f') { - flag = strip_prefix(flag, "-C").unwrap_or(flag); - if let Some(flag) = strip_prefix(flag, "target-cpu=") { - cpu = Some(flag); - } - } - cpu.map(str::to_owned) -} - -fn is_allowed_feature(name: &str) -> bool { - // allowed by default - let mut allowed = true; - if let Some(rustflags) = env::var_os("CARGO_ENCODED_RUSTFLAGS") { - for mut flag in rustflags.to_string_lossy().split('\x1f') { - flag = strip_prefix(flag, "-Z").unwrap_or(flag); - if let Some(flag) = strip_prefix(flag, "allow-features=") { - // If it is specified multiple times, the last value will be preferred. - allowed = flag.split(',').any(|allowed| allowed == name); - } - } - } - allowed -} - -// Adapted from https://github.com/crossbeam-rs/crossbeam/blob/crossbeam-utils-0.8.14/build-common.rs. -// -// The target triplets have the form of 'arch-vendor-system'. -// -// When building for Linux (e.g. the 'system' part is -// 'linux-something'), replace the vendor with 'unknown' -// so that mapping to rust standard targets happens correctly. -fn convert_custom_linux_target(target: &str) -> String { - let mut parts: Vec<&str> = target.split('-').collect(); - let system = parts.get(2); - if system == Some(&"linux") { - parts[1] = "unknown"; - } - parts.join("-") -} - -// str::strip_prefix requires Rust 1.45 -#[must_use] -fn strip_prefix<'a>(s: &'a str, pat: &str) -> Option<&'a str> { - if s.starts_with(pat) { - Some(&s[pat.len()..]) - } else { - None - } -} -// str::strip_suffix requires Rust 1.45 -#[must_use] -fn strip_suffix<'a>(s: &'a str, pat: &str) -> Option<&'a str> { - if s.ends_with(pat) { - Some(&s[..s.len() - pat.len()]) - } else { - None - } -} |