| use crate::back::write::create_informational_target_machine; |
| use crate::llvm; |
| use libc::c_int; |
| use rustc_data_structures::fx::FxHashSet; |
| use rustc_feature::UnstableFeatures; |
| use rustc_middle::bug; |
| use rustc_session::config::PrintRequest; |
| use rustc_session::Session; |
| use rustc_span::symbol::sym; |
| use rustc_span::symbol::Symbol; |
| use rustc_target::spec::{MergeFunctions, PanicStrategy}; |
| use std::ffi::CString; |
| |
| use std::slice; |
| use std::str; |
| use std::sync::atomic::{AtomicBool, Ordering}; |
| use std::sync::Once; |
| |
| static POISONED: AtomicBool = AtomicBool::new(false); |
| static INIT: Once = Once::new(); |
| |
| pub(crate) fn init(sess: &Session) { |
| unsafe { |
| // Before we touch LLVM, make sure that multithreading is enabled. |
| INIT.call_once(|| { |
| if llvm::LLVMStartMultithreaded() != 1 { |
| // use an extra bool to make sure that all future usage of LLVM |
| // cannot proceed despite the Once not running more than once. |
| POISONED.store(true, Ordering::SeqCst); |
| } |
| |
| configure_llvm(sess); |
| }); |
| |
| if POISONED.load(Ordering::SeqCst) { |
| bug!("couldn't enable multi-threaded LLVM"); |
| } |
| } |
| } |
| |
| fn require_inited() { |
| INIT.call_once(|| bug!("llvm is not initialized")); |
| if POISONED.load(Ordering::SeqCst) { |
| bug!("couldn't enable multi-threaded LLVM"); |
| } |
| } |
| |
| unsafe fn configure_llvm(sess: &Session) { |
| let n_args = sess.opts.cg.llvm_args.len() + sess.target.target.options.llvm_args.len(); |
| let mut llvm_c_strs = Vec::with_capacity(n_args + 1); |
| let mut llvm_args = Vec::with_capacity(n_args + 1); |
| |
| llvm::LLVMRustInstallFatalErrorHandler(); |
| |
| fn llvm_arg_to_arg_name(full_arg: &str) -> &str { |
| full_arg.trim().split(|c: char| c == '=' || c.is_whitespace()).next().unwrap_or("") |
| } |
| |
| let cg_opts = sess.opts.cg.llvm_args.iter(); |
| let tg_opts = sess.target.target.options.llvm_args.iter(); |
| let sess_args = cg_opts.chain(tg_opts); |
| |
| let user_specified_args: FxHashSet<_> = |
| sess_args.clone().map(|s| llvm_arg_to_arg_name(s)).filter(|s| !s.is_empty()).collect(); |
| |
| { |
| // This adds the given argument to LLVM. Unless `force` is true |
| // user specified arguments are *not* overridden. |
| let mut add = |arg: &str, force: bool| { |
| if force || !user_specified_args.contains(llvm_arg_to_arg_name(arg)) { |
| let s = CString::new(arg).unwrap(); |
| llvm_args.push(s.as_ptr()); |
| llvm_c_strs.push(s); |
| } |
| }; |
| add("rustc", true); // fake program name |
| if sess.time_llvm_passes() { |
| add("-time-passes", false); |
| } |
| if sess.print_llvm_passes() { |
| add("-debug-pass=Structure", false); |
| } |
| if !sess.opts.debugging_opts.no_generate_arange_section { |
| add("-generate-arange-section", false); |
| } |
| if get_major_version() >= 8 { |
| match sess |
| .opts |
| .debugging_opts |
| .merge_functions |
| .unwrap_or(sess.target.target.options.merge_functions) |
| { |
| MergeFunctions::Disabled | MergeFunctions::Trampolines => {} |
| MergeFunctions::Aliases => { |
| add("-mergefunc-use-aliases", false); |
| } |
| } |
| } |
| |
| if sess.target.target.target_os == "emscripten" |
| && sess.panic_strategy() == PanicStrategy::Unwind |
| { |
| add("-enable-emscripten-cxx-exceptions", false); |
| } |
| |
| // HACK(eddyb) LLVM inserts `llvm.assume` calls to preserve align attributes |
| // during inlining. Unfortunately these may block other optimizations. |
| add("-preserve-alignment-assumptions-during-inlining=false", false); |
| |
| for arg in sess_args { |
| add(&(*arg), true); |
| } |
| } |
| |
| if sess.opts.debugging_opts.llvm_time_trace && get_major_version() >= 9 { |
| // time-trace is not thread safe and running it in parallel will cause seg faults. |
| if !sess.opts.debugging_opts.no_parallel_llvm { |
| bug!("`-Z llvm-time-trace` requires `-Z no-parallel-llvm") |
| } |
| |
| llvm::LLVMTimeTraceProfilerInitialize(); |
| } |
| |
| llvm::LLVMInitializePasses(); |
| |
| ::rustc_llvm::initialize_available_targets(); |
| |
| llvm::LLVMRustSetLLVMOptions(llvm_args.len() as c_int, llvm_args.as_ptr()); |
| } |
| |
| pub fn time_trace_profiler_finish(file_name: &str) { |
| unsafe { |
| if get_major_version() >= 9 { |
| let file_name = CString::new(file_name).unwrap(); |
| llvm::LLVMTimeTraceProfilerFinish(file_name.as_ptr()); |
| } |
| } |
| } |
| |
| // WARNING: the features after applying `to_llvm_feature` must be known |
| // to LLVM or the feature detection code will walk past the end of the feature |
| // array, leading to crashes. |
| |
| const ARM_WHITELIST: &[(&str, Option<Symbol>)] = &[ |
| ("aclass", Some(sym::arm_target_feature)), |
| ("mclass", Some(sym::arm_target_feature)), |
| ("rclass", Some(sym::arm_target_feature)), |
| ("dsp", Some(sym::arm_target_feature)), |
| ("neon", Some(sym::arm_target_feature)), |
| ("crc", Some(sym::arm_target_feature)), |
| ("crypto", Some(sym::arm_target_feature)), |
| ("v5te", Some(sym::arm_target_feature)), |
| ("v6", Some(sym::arm_target_feature)), |
| ("v6k", Some(sym::arm_target_feature)), |
| ("v6t2", Some(sym::arm_target_feature)), |
| ("v7", Some(sym::arm_target_feature)), |
| ("v8", Some(sym::arm_target_feature)), |
| ("vfp2", Some(sym::arm_target_feature)), |
| ("vfp3", Some(sym::arm_target_feature)), |
| ("vfp4", Some(sym::arm_target_feature)), |
| ]; |
| |
| const AARCH64_WHITELIST: &[(&str, Option<Symbol>)] = &[ |
| ("fp", Some(sym::aarch64_target_feature)), |
| ("neon", Some(sym::aarch64_target_feature)), |
| ("sve", Some(sym::aarch64_target_feature)), |
| ("crc", Some(sym::aarch64_target_feature)), |
| ("crypto", Some(sym::aarch64_target_feature)), |
| ("ras", Some(sym::aarch64_target_feature)), |
| ("lse", Some(sym::aarch64_target_feature)), |
| ("rdm", Some(sym::aarch64_target_feature)), |
| ("fp16", Some(sym::aarch64_target_feature)), |
| ("rcpc", Some(sym::aarch64_target_feature)), |
| ("dotprod", Some(sym::aarch64_target_feature)), |
| ("v8.1a", Some(sym::aarch64_target_feature)), |
| ("v8.2a", Some(sym::aarch64_target_feature)), |
| ("v8.3a", Some(sym::aarch64_target_feature)), |
| ]; |
| |
| const X86_WHITELIST: &[(&str, Option<Symbol>)] = &[ |
| ("adx", Some(sym::adx_target_feature)), |
| ("aes", None), |
| ("avx", None), |
| ("avx2", None), |
| ("avx512bw", Some(sym::avx512_target_feature)), |
| ("avx512cd", Some(sym::avx512_target_feature)), |
| ("avx512dq", Some(sym::avx512_target_feature)), |
| ("avx512er", Some(sym::avx512_target_feature)), |
| ("avx512f", Some(sym::avx512_target_feature)), |
| ("avx512ifma", Some(sym::avx512_target_feature)), |
| ("avx512pf", Some(sym::avx512_target_feature)), |
| ("avx512vbmi", Some(sym::avx512_target_feature)), |
| ("avx512vl", Some(sym::avx512_target_feature)), |
| ("avx512vpopcntdq", Some(sym::avx512_target_feature)), |
| ("bmi1", None), |
| ("bmi2", None), |
| ("cmpxchg16b", Some(sym::cmpxchg16b_target_feature)), |
| ("f16c", Some(sym::f16c_target_feature)), |
| ("fma", None), |
| ("fxsr", None), |
| ("lzcnt", None), |
| ("mmx", Some(sym::mmx_target_feature)), |
| ("movbe", Some(sym::movbe_target_feature)), |
| ("pclmulqdq", None), |
| ("popcnt", None), |
| ("rdrand", None), |
| ("rdseed", None), |
| ("rtm", Some(sym::rtm_target_feature)), |
| ("sha", None), |
| ("sse", None), |
| ("sse2", None), |
| ("sse3", None), |
| ("sse4.1", None), |
| ("sse4.2", None), |
| ("sse4a", Some(sym::sse4a_target_feature)), |
| ("ssse3", None), |
| ("tbm", Some(sym::tbm_target_feature)), |
| ("xsave", None), |
| ("xsavec", None), |
| ("xsaveopt", None), |
| ("xsaves", None), |
| ]; |
| |
| const HEXAGON_WHITELIST: &[(&str, Option<Symbol>)] = &[ |
| ("hvx", Some(sym::hexagon_target_feature)), |
| ("hvx-length128b", Some(sym::hexagon_target_feature)), |
| ]; |
| |
| const POWERPC_WHITELIST: &[(&str, Option<Symbol>)] = &[ |
| ("altivec", Some(sym::powerpc_target_feature)), |
| ("power8-altivec", Some(sym::powerpc_target_feature)), |
| ("power9-altivec", Some(sym::powerpc_target_feature)), |
| ("power8-vector", Some(sym::powerpc_target_feature)), |
| ("power9-vector", Some(sym::powerpc_target_feature)), |
| ("vsx", Some(sym::powerpc_target_feature)), |
| ]; |
| |
| const MIPS_WHITELIST: &[(&str, Option<Symbol>)] = |
| &[("fp64", Some(sym::mips_target_feature)), ("msa", Some(sym::mips_target_feature))]; |
| |
| const WASM_WHITELIST: &[(&str, Option<Symbol>)] = |
| &[("simd128", Some(sym::wasm_target_feature)), ("atomics", Some(sym::wasm_target_feature))]; |
| |
| /// When rustdoc is running, provide a list of all known features so that all their respective |
| /// primitives may be documented. |
| /// |
| /// IMPORTANT: If you're adding another whitelist to the above lists, make sure to add it to this |
| /// iterator! |
| pub fn all_known_features() -> impl Iterator<Item = (&'static str, Option<Symbol>)> { |
| ARM_WHITELIST |
| .iter() |
| .cloned() |
| .chain(AARCH64_WHITELIST.iter().cloned()) |
| .chain(X86_WHITELIST.iter().cloned()) |
| .chain(HEXAGON_WHITELIST.iter().cloned()) |
| .chain(POWERPC_WHITELIST.iter().cloned()) |
| .chain(MIPS_WHITELIST.iter().cloned()) |
| .chain(WASM_WHITELIST.iter().cloned()) |
| } |
| |
| pub fn to_llvm_feature<'a>(sess: &Session, s: &'a str) -> &'a str { |
| let arch = if sess.target.target.arch == "x86_64" { "x86" } else { &*sess.target.target.arch }; |
| match (arch, s) { |
| ("x86", "pclmulqdq") => "pclmul", |
| ("x86", "rdrand") => "rdrnd", |
| ("x86", "bmi1") => "bmi", |
| ("x86", "cmpxchg16b") => "cx16", |
| ("aarch64", "fp") => "fp-armv8", |
| ("aarch64", "fp16") => "fullfp16", |
| (_, s) => s, |
| } |
| } |
| |
| pub fn target_features(sess: &Session) -> Vec<Symbol> { |
| let target_machine = create_informational_target_machine(sess, true); |
| target_feature_whitelist(sess) |
| .iter() |
| .filter_map(|&(feature, gate)| { |
| if UnstableFeatures::from_environment().is_nightly_build() || gate.is_none() { |
| Some(feature) |
| } else { |
| None |
| } |
| }) |
| .filter(|feature| { |
| let llvm_feature = to_llvm_feature(sess, feature); |
| let cstr = CString::new(llvm_feature).unwrap(); |
| unsafe { llvm::LLVMRustHasFeature(target_machine, cstr.as_ptr()) } |
| }) |
| .map(|feature| Symbol::intern(feature)) |
| .collect() |
| } |
| |
| pub fn target_feature_whitelist(sess: &Session) -> &'static [(&'static str, Option<Symbol>)] { |
| match &*sess.target.target.arch { |
| "arm" => ARM_WHITELIST, |
| "aarch64" => AARCH64_WHITELIST, |
| "x86" | "x86_64" => X86_WHITELIST, |
| "hexagon" => HEXAGON_WHITELIST, |
| "mips" | "mips64" => MIPS_WHITELIST, |
| "powerpc" | "powerpc64" => POWERPC_WHITELIST, |
| "wasm32" => WASM_WHITELIST, |
| _ => &[], |
| } |
| } |
| |
| pub fn print_version() { |
| // Can be called without initializing LLVM |
| unsafe { |
| println!("LLVM version: {}.{}", llvm::LLVMRustVersionMajor(), llvm::LLVMRustVersionMinor()); |
| } |
| } |
| |
| pub fn get_major_version() -> u32 { |
| unsafe { llvm::LLVMRustVersionMajor() } |
| } |
| |
| pub fn print_passes() { |
| // Can be called without initializing LLVM |
| unsafe { |
| llvm::LLVMRustPrintPasses(); |
| } |
| } |
| |
| pub(crate) fn print(req: PrintRequest, sess: &Session) { |
| require_inited(); |
| let tm = create_informational_target_machine(sess, true); |
| unsafe { |
| match req { |
| PrintRequest::TargetCPUs => llvm::LLVMRustPrintTargetCPUs(tm), |
| PrintRequest::TargetFeatures => llvm::LLVMRustPrintTargetFeatures(tm), |
| _ => bug!("rustc_codegen_llvm can't handle print request: {:?}", req), |
| } |
| } |
| } |
| |
| pub fn target_cpu(sess: &Session) -> &str { |
| let name = match sess.opts.cg.target_cpu { |
| Some(ref s) => &**s, |
| None => &*sess.target.target.options.cpu, |
| }; |
| if name != "native" { |
| return name; |
| } |
| |
| unsafe { |
| let mut len = 0; |
| let ptr = llvm::LLVMRustGetHostCPUName(&mut len); |
| str::from_utf8(slice::from_raw_parts(ptr as *const u8, len)).unwrap() |
| } |
| } |