445 lines
16 KiB
Rust
445 lines
16 KiB
Rust
use std::env;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let target = env::var("TARGET").unwrap();
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// Emscripten's runtime includes all the builtins
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if target.contains("emscripten") {
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return;
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}
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// OpenBSD provides compiler_rt by default, use it instead of rebuilding it from source
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if target.contains("openbsd") {
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println!("cargo:rustc-link-search=native=/usr/lib");
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println!("cargo:rustc-link-lib=compiler_rt");
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return;
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}
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// Forcibly enable memory intrinsics on wasm32 as we don't have a libc to
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// provide them.
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if target.contains("wasm32") {
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println!("cargo:rustc-cfg=feature=\"mem\"");
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}
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// NOTE we are going to assume that llvm-target, what determines our codegen option, matches the
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// target triple. This is usually correct for our built-in targets but can break in presence of
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// custom targets, which can have arbitrary names.
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let llvm_target = target.split('-').collect::<Vec<_>>();
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// Build missing intrinsics from compiler-rt C source code. If we're
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// mangling names though we assume that we're also in test mode so we don't
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// build anything and we rely on the upstream implementation of compiler-rt
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// functions
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if !cfg!(feature = "mangled-names") && cfg!(feature = "c") {
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// no C compiler for wasm
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if !target.contains("wasm32") {
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#[cfg(feature = "c")]
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c::compile(&llvm_target);
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println!("cargo:rustc-cfg=use_c");
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}
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}
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// To compile intrinsics.rs for thumb targets, where there is no libc
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if llvm_target[0].starts_with("thumb") {
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println!("cargo:rustc-cfg=thumb")
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}
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// compiler-rt `cfg`s away some intrinsics for thumbv6m because that target doesn't have full
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// THUMBv2 support. We have to cfg our code accordingly.
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if llvm_target[0] == "thumbv6m" {
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println!("cargo:rustc-cfg=thumbv6m")
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}
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// Only emit the ARM Linux atomic emulation on pre-ARMv6 architectures.
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if llvm_target[0] == "armv4t" || llvm_target[0] == "armv5te" {
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println!("cargo:rustc-cfg=kernel_user_helpers")
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}
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}
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#[cfg(feature = "c")]
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mod c {
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extern crate cc;
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use std::collections::BTreeMap;
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use std::env;
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use std::path::Path;
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struct Sources {
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// SYMBOL -> PATH TO SOURCE
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map: BTreeMap<&'static str, &'static str>,
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}
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impl Sources {
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fn new() -> Sources {
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Sources { map: BTreeMap::new() }
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}
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fn extend(&mut self, sources: &[&'static str]) {
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// NOTE Some intrinsics have both a generic implementation (e.g.
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// `floatdidf.c`) and an arch optimized implementation
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// (`x86_64/floatdidf.c`). In those cases, we keep the arch optimized
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// implementation and discard the generic implementation. If we don't
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// and keep both implementations, the linker will yell at us about
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// duplicate symbols!
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for &src in sources {
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let symbol = Path::new(src).file_stem().unwrap().to_str().unwrap();
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if src.contains("/") {
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// Arch-optimized implementation (preferred)
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self.map.insert(symbol, src);
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} else {
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// Generic implementation
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if !self.map.contains_key(symbol) {
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self.map.insert(symbol, src);
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}
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}
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}
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}
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fn remove(&mut self, symbols: &[&str]) {
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for symbol in symbols {
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self.map.remove(*symbol).unwrap();
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}
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}
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}
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/// Compile intrinsics from the compiler-rt C source code
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pub fn compile(llvm_target: &[&str]) {
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let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
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let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
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let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
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let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
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let cfg = &mut cc::Build::new();
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cfg.warnings(false);
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if target_env == "msvc" {
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// Don't pull in extra libraries on MSVC
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cfg.flag("/Zl");
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// Emulate C99 and C++11's __func__ for MSVC prior to 2013 CTP
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cfg.define("__func__", Some("__FUNCTION__"));
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} else {
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// Turn off various features of gcc and such, mostly copying
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// compiler-rt's build system already
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cfg.flag("-fno-builtin");
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cfg.flag("-fvisibility=hidden");
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cfg.flag("-ffreestanding");
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// Avoid the following warning appearing once **per file**:
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// clang: warning: optimization flag '-fomit-frame-pointer' is not supported for target 'armv7' [-Wignored-optimization-argument]
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//
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// Note that compiler-rt's build system also checks
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//
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// `check_cxx_compiler_flag(-fomit-frame-pointer COMPILER_RT_HAS_FOMIT_FRAME_POINTER_FLAG)`
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//
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// in https://github.com/rust-lang/compiler-rt/blob/c8fbcb3/cmake/config-ix.cmake#L19.
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cfg.flag_if_supported("-fomit-frame-pointer");
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cfg.define("VISIBILITY_HIDDEN", None);
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}
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let mut sources = Sources::new();
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sources.extend(
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&[
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"absvdi2.c",
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"absvsi2.c",
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"addvdi3.c",
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"addvsi3.c",
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"apple_versioning.c",
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"clzdi2.c",
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"clzsi2.c",
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"cmpdi2.c",
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"ctzdi2.c",
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"ctzsi2.c",
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"divdc3.c",
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"divsc3.c",
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"divxc3.c",
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"extendhfsf2.c",
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"int_util.c",
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"muldc3.c",
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"mulsc3.c",
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"mulvdi3.c",
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"mulvsi3.c",
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"mulxc3.c",
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"negdf2.c",
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"negdi2.c",
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"negsf2.c",
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"negvdi2.c",
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"negvsi2.c",
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"paritydi2.c",
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"paritysi2.c",
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"popcountdi2.c",
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"popcountsi2.c",
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"powixf2.c",
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"subvdi3.c",
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"subvsi3.c",
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"truncdfhf2.c",
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"truncdfsf2.c",
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"truncsfhf2.c",
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"ucmpdi2.c",
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],
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);
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// When compiling in rustbuild (the rust-lang/rust repo) this library
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// also needs to satisfy intrinsics that jemalloc or C in general may
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// need, so include a few more that aren't typically needed by
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// LLVM/Rust.
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if cfg!(feature = "rustbuild") {
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sources.extend(&[
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"ffsdi2.c",
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]);
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}
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// On iOS and 32-bit OSX these are all just empty intrinsics, no need to
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// include them.
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if target_os != "ios" && (target_vendor != "apple" || target_arch != "x86") {
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sources.extend(
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&[
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"absvti2.c",
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"addvti3.c",
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"clzti2.c",
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"cmpti2.c",
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"ctzti2.c",
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"ffsti2.c",
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"mulvti3.c",
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"negti2.c",
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"negvti2.c",
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"parityti2.c",
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"popcountti2.c",
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"subvti3.c",
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"ucmpti2.c",
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],
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);
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}
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if target_vendor == "apple" {
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sources.extend(
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&[
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"atomic_flag_clear.c",
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"atomic_flag_clear_explicit.c",
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"atomic_flag_test_and_set.c",
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"atomic_flag_test_and_set_explicit.c",
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"atomic_signal_fence.c",
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"atomic_thread_fence.c",
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],
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);
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}
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if target_env == "msvc" {
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if target_arch == "x86_64" {
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sources.extend(
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&[
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"x86_64/floatdisf.c",
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"x86_64/floatdixf.c",
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],
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);
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}
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} else {
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// None of these seem to be used on x86_64 windows, and they've all
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// got the wrong ABI anyway, so we want to avoid them.
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if target_os != "windows" {
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if target_arch == "x86_64" {
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sources.extend(
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&[
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"x86_64/floatdisf.c",
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"x86_64/floatdixf.c",
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"x86_64/floatundidf.S",
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"x86_64/floatundisf.S",
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"x86_64/floatundixf.S",
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],
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);
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}
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}
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if target_arch == "x86" {
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sources.extend(
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&[
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"i386/ashldi3.S",
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"i386/ashrdi3.S",
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"i386/divdi3.S",
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"i386/floatdidf.S",
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"i386/floatdisf.S",
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"i386/floatdixf.S",
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"i386/floatundidf.S",
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"i386/floatundisf.S",
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"i386/floatundixf.S",
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"i386/lshrdi3.S",
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"i386/moddi3.S",
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"i386/muldi3.S",
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"i386/udivdi3.S",
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"i386/umoddi3.S",
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],
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);
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}
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}
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if target_arch == "arm" && target_os != "ios" && target_env != "msvc" {
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sources.extend(
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&[
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"arm/aeabi_div0.c",
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"arm/aeabi_drsub.c",
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"arm/aeabi_frsub.c",
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"arm/bswapdi2.S",
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"arm/bswapsi2.S",
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"arm/clzdi2.S",
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"arm/clzsi2.S",
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"arm/divmodsi4.S",
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"arm/modsi3.S",
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"arm/switch16.S",
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"arm/switch32.S",
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"arm/switch8.S",
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"arm/switchu8.S",
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"arm/sync_synchronize.S",
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"arm/udivmodsi4.S",
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"arm/umodsi3.S",
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// Exclude these two files for now even though we haven't
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// translated their implementation into Rust yet (#173).
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// They appear... buggy? The `udivsi3` implementation was
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// the one that seemed buggy, but the `divsi3` file
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// references a symbol from `udivsi3` so we compile them
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// both with the Rust versions.
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//
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// Note that if these are added back they should be removed
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// from thumbv6m below.
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//
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// "arm/divsi3.S",
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// "arm/udivsi3.S",
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],
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);
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// First of all aeabi_cdcmp and aeabi_cfcmp are never called by LLVM.
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// Second are little-endian only, so build fail on big-endian targets.
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// Temporally workaround: exclude these files for big-endian targets.
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if !llvm_target[0].starts_with("thumbeb") &&
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!llvm_target[0].starts_with("armeb") {
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sources.extend(
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&[
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"arm/aeabi_cdcmp.S",
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"arm/aeabi_cdcmpeq_check_nan.c",
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"arm/aeabi_cfcmp.S",
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"arm/aeabi_cfcmpeq_check_nan.c",
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],
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);
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}
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}
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if llvm_target[0] == "armv7" {
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sources.extend(
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&[
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"arm/sync_fetch_and_add_4.S",
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"arm/sync_fetch_and_add_8.S",
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"arm/sync_fetch_and_and_4.S",
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"arm/sync_fetch_and_and_8.S",
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"arm/sync_fetch_and_max_4.S",
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"arm/sync_fetch_and_max_8.S",
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"arm/sync_fetch_and_min_4.S",
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"arm/sync_fetch_and_min_8.S",
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"arm/sync_fetch_and_nand_4.S",
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"arm/sync_fetch_and_nand_8.S",
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"arm/sync_fetch_and_or_4.S",
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"arm/sync_fetch_and_or_8.S",
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"arm/sync_fetch_and_sub_4.S",
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"arm/sync_fetch_and_sub_8.S",
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"arm/sync_fetch_and_umax_4.S",
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"arm/sync_fetch_and_umax_8.S",
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"arm/sync_fetch_and_umin_4.S",
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"arm/sync_fetch_and_umin_8.S",
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"arm/sync_fetch_and_xor_4.S",
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"arm/sync_fetch_and_xor_8.S",
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],
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);
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}
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if llvm_target.last().unwrap().ends_with("eabihf") {
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if !llvm_target[0].starts_with("thumbv7em") {
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sources.extend(
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&[
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"arm/fixdfsivfp.S",
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"arm/fixsfsivfp.S",
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"arm/fixunsdfsivfp.S",
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"arm/fixunssfsivfp.S",
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"arm/floatsidfvfp.S",
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"arm/floatsisfvfp.S",
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"arm/floatunssidfvfp.S",
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"arm/floatunssisfvfp.S",
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"arm/restore_vfp_d8_d15_regs.S",
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"arm/save_vfp_d8_d15_regs.S",
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],
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);
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}
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sources.extend(&["arm/negdf2vfp.S", "arm/negsf2vfp.S"]);
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}
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if target_arch == "aarch64" {
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sources.extend(
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&[
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"comparetf2.c",
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"extenddftf2.c",
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"extendsftf2.c",
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"fixtfdi.c",
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"fixtfsi.c",
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"fixtfti.c",
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"fixunstfdi.c",
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"fixunstfsi.c",
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"fixunstfti.c",
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"floatditf.c",
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"floatsitf.c",
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"floatunditf.c",
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"floatunsitf.c",
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"trunctfdf2.c",
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"trunctfsf2.c",
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],
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);
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if target_os != "windows" {
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sources.extend(&["multc3.c"]);
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}
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}
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// Remove the assembly implementations that won't compile for the target
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if llvm_target[0] == "thumbv6m" {
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sources.remove(
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&[
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"clzdi2",
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"clzsi2",
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"divmodsi4",
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"modsi3",
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"switch16",
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"switch32",
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"switch8",
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"switchu8",
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"udivmodsi4",
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"umodsi3",
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],
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);
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// But use some generic implementations where possible
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sources.extend(&["clzdi2.c", "clzsi2.c"])
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}
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if llvm_target[0] == "thumbv7m" || llvm_target[0] == "thumbv7em" {
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sources.remove(&["aeabi_cdcmp", "aeabi_cfcmp"]);
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}
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// When compiling in rustbuild (the rust-lang/rust repo) this build
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// script runs from a directory other than this root directory.
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let root = if cfg!(feature = "rustbuild") {
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Path::new("../../libcompiler_builtins")
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} else {
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Path::new(".")
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};
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let src_dir = root.join("compiler-rt/lib/builtins");
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for src in sources.map.values() {
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let src = src_dir.join(src);
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cfg.file(&src);
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println!("cargo:rerun-if-changed={}", src.display());
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}
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cfg.compile("libcompiler-rt.a");
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}
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}
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