1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use syntax_pos::symbol::Symbol;
12 use back::write::create_target_machine;
14 use rustc::session::Session;
15 use rustc::session::config::PrintRequest;
16 use libc::{c_int, c_char};
17 use std::ffi::CString;
19 use std::sync::atomic::{AtomicBool, Ordering};
22 pub fn init(sess: &Session) {
24 // Before we touch LLVM, make sure that multithreading is enabled.
25 static POISONED: AtomicBool = AtomicBool::new(false);
26 static INIT: Once = Once::new();
28 if llvm::LLVMStartMultithreaded() != 1 {
29 // use an extra bool to make sure that all future usage of LLVM
30 // cannot proceed despite the Once not running more than once.
31 POISONED.store(true, Ordering::SeqCst);
37 if POISONED.load(Ordering::SeqCst) {
38 bug!("couldn't enable multi-threaded LLVM");
43 unsafe fn configure_llvm(sess: &Session) {
44 let mut llvm_c_strs = Vec::new();
45 let mut llvm_args = Vec::new();
48 let mut add = |arg: &str| {
49 let s = CString::new(arg).unwrap();
50 llvm_args.push(s.as_ptr());
53 add("rustc"); // fake program name
54 if sess.time_llvm_passes() { add("-time-passes"); }
55 if sess.print_llvm_passes() { add("-debug-pass=Structure"); }
57 for arg in &sess.opts.cg.llvm_args {
62 llvm::LLVMInitializePasses();
64 llvm::initialize_available_targets();
66 llvm::LLVMRustSetLLVMOptions(llvm_args.len() as c_int,
70 // WARNING: the features must be known to LLVM or the feature
71 // detection code will walk past the end of the feature array,
72 // leading to crashes.
74 const ARM_WHITELIST: &'static [&'static str] = &["neon\0", "vfp2\0", "vfp3\0", "vfp4\0"];
76 const AARCH64_WHITELIST: &'static [&'static str] = &["neon\0"];
78 const X86_WHITELIST: &'static [&'static str] = &["avx\0", "avx2\0", "bmi\0", "bmi2\0", "sse\0",
79 "sse2\0", "sse3\0", "sse4.1\0", "sse4.2\0",
80 "ssse3\0", "tbm\0", "lzcnt\0", "popcnt\0",
81 "sse4a\0", "rdrnd\0", "rdseed\0", "fma\0",
82 "xsave\0", "xsaveopt\0", "xsavec\0",
85 const HEXAGON_WHITELIST: &'static [&'static str] = &["hvx\0", "hvx-double\0"];
87 const POWERPC_WHITELIST: &'static [&'static str] = &["altivec\0",
88 "power8-altivec\0", "power9-altivec\0",
89 "power8-vector\0", "power9-vector\0",
92 pub fn target_features(sess: &Session) -> Vec<Symbol> {
93 let target_machine = create_target_machine(sess);
95 let whitelist = match &*sess.target.target.arch {
96 "arm" => ARM_WHITELIST,
97 "aarch64" => AARCH64_WHITELIST,
98 "x86" | "x86_64" => X86_WHITELIST,
99 "hexagon" => HEXAGON_WHITELIST,
100 "powerpc" | "powerpc64" => POWERPC_WHITELIST,
104 let mut features = Vec::new();
105 for feat in whitelist {
106 assert_eq!(feat.chars().last(), Some('\0'));
107 if unsafe { llvm::LLVMRustHasFeature(target_machine, feat.as_ptr() as *const c_char) } {
108 features.push(Symbol::intern(&feat[..feat.len() - 1]));
114 pub fn print_version() {
116 println!("LLVM version: {}.{}",
117 llvm::LLVMRustVersionMajor(), llvm::LLVMRustVersionMinor());
121 pub fn print_passes() {
122 unsafe { llvm::LLVMRustPrintPasses(); }
125 pub fn print(req: PrintRequest, sess: &Session) {
126 let tm = create_target_machine(sess);
129 PrintRequest::TargetCPUs => llvm::LLVMRustPrintTargetCPUs(tm),
130 PrintRequest::TargetFeatures => llvm::LLVMRustPrintTargetFeatures(tm),
131 _ => bug!("rustc_trans can't handle print request: {:?}", req),
136 pub fn enable_llvm_debug() {
137 unsafe { llvm::LLVMRustSetDebug(1); }