1 // Copyright 2013-2015 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.
12 use back::link::{get_cc_prog, remove};
13 use session::config::{OutputFilenames, NoDebugInfo, Passes, SomePasses, AllPasses};
17 use llvm::{ModuleRef, TargetMachineRef, PassManagerRef, DiagnosticInfoRef, ContextRef};
18 use llvm::SMDiagnosticRef;
19 use trans::{CrateTranslation, ModuleTranslation};
20 use util::common::time;
22 use syntax::diagnostic;
23 use syntax::diagnostic::{Emitter, Handler, Level, mk_handler};
25 use std::ffi::{self, CString};
28 use std::iter::Unfold;
32 use std::sync::{Arc, Mutex};
33 use std::sync::mpsc::channel;
35 use libc::{self, c_uint, c_int, c_void};
37 #[derive(Clone, Copy, PartialEq, PartialOrd, Ord, Eq)]
41 OutputTypeLlvmAssembly,
46 pub fn llvm_err(handler: &diagnostic::Handler, msg: String) -> ! {
48 let cstr = llvm::LLVMRustGetLastError();
49 if cstr == ptr::null() {
50 handler.fatal(&msg[]);
52 let err = ffi::c_str_to_bytes(&cstr);
53 let err = String::from_utf8_lossy(err.as_slice()).to_string();
54 libc::free(cstr as *mut _);
55 handler.fatal(&format!("{}: {}",
62 pub fn write_output_file(
63 handler: &diagnostic::Handler,
64 target: llvm::TargetMachineRef,
65 pm: llvm::PassManagerRef,
68 file_type: llvm::FileType) {
70 let output_c = CString::from_slice(output.as_vec());
71 let result = llvm::LLVMRustWriteOutputFile(
72 target, pm, m, output_c.as_ptr(), file_type);
74 llvm_err(handler, format!("could not write output to {}", output.display()));
86 // We use an Arc instead of just returning a list of diagnostics from the
87 // child task because we need to make sure that the messages are seen even
88 // if the child task panics (for example, when `fatal` is called).
90 struct SharedEmitter {
91 buffer: Arc<Mutex<Vec<Diagnostic>>>,
95 fn new() -> SharedEmitter {
97 buffer: Arc::new(Mutex::new(Vec::new())),
101 fn dump(&mut self, handler: &Handler) {
102 let mut buffer = self.buffer.lock().unwrap();
103 for diag in buffer.iter() {
106 handler.emit_with_code(None,
122 impl Emitter for SharedEmitter {
123 fn emit(&mut self, cmsp: Option<(&codemap::CodeMap, codemap::Span)>,
124 msg: &str, code: Option<&str>, lvl: Level) {
125 assert!(cmsp.is_none(), "SharedEmitter doesn't support spans");
127 self.buffer.lock().unwrap().push(Diagnostic {
128 msg: msg.to_string(),
129 code: code.map(|s| s.to_string()),
134 fn custom_emit(&mut self, _cm: &codemap::CodeMap,
135 _sp: diagnostic::RenderSpan, _msg: &str, _lvl: Level) {
136 panic!("SharedEmitter doesn't support custom_emit");
141 // On android, we by default compile for armv7 processors. This enables
142 // things like double word CAS instructions (rather than emulating them)
143 // which are *far* more efficient. This is obviously undesirable in some
144 // cases, so if any sort of target feature is specified we don't append v7
145 // to the feature list.
147 // On iOS only armv7 and newer are supported. So it is useful to
148 // get all hardware potential via VFP3 (hardware floating point)
149 // and NEON (SIMD) instructions supported by LLVM.
150 // Note that without those flags various linking errors might
151 // arise as some of intrinsics are converted into function calls
152 // and nobody provides implementations those functions
153 fn target_feature(sess: &Session) -> String {
154 format!("{},{}", sess.target.target.options.features, sess.opts.cg.target_feature)
157 fn get_llvm_opt_level(optimize: config::OptLevel) -> llvm::CodeGenOptLevel {
159 config::No => llvm::CodeGenLevelNone,
160 config::Less => llvm::CodeGenLevelLess,
161 config::Default => llvm::CodeGenLevelDefault,
162 config::Aggressive => llvm::CodeGenLevelAggressive,
166 fn create_target_machine(sess: &Session) -> TargetMachineRef {
167 let reloc_model_arg = match sess.opts.cg.relocation_model {
169 None => &sess.target.target.options.relocation_model[]
171 let reloc_model = match reloc_model_arg {
172 "pic" => llvm::RelocPIC,
173 "static" => llvm::RelocStatic,
174 "default" => llvm::RelocDefault,
175 "dynamic-no-pic" => llvm::RelocDynamicNoPic,
177 sess.err(&format!("{:?} is not a valid relocation mode",
180 .relocation_model)[]);
181 sess.abort_if_errors();
186 let opt_level = get_llvm_opt_level(sess.opts.optimize);
187 let use_softfp = sess.opts.cg.soft_float;
189 // FIXME: #11906: Omitting frame pointers breaks retrieving the value of a parameter.
190 let no_fp_elim = (sess.opts.debuginfo != NoDebugInfo) ||
191 !sess.target.target.options.eliminate_frame_pointer;
193 let any_library = sess.crate_types.borrow().iter().any(|ty| {
194 *ty != config::CrateTypeExecutable
197 let ffunction_sections = sess.target.target.options.function_sections;
198 let fdata_sections = ffunction_sections;
200 let code_model_arg = match sess.opts.cg.code_model {
202 None => &sess.target.target.options.code_model[]
205 let code_model = match code_model_arg {
206 "default" => llvm::CodeModelDefault,
207 "small" => llvm::CodeModelSmall,
208 "kernel" => llvm::CodeModelKernel,
209 "medium" => llvm::CodeModelMedium,
210 "large" => llvm::CodeModelLarge,
212 sess.err(&format!("{:?} is not a valid code model",
216 sess.abort_if_errors();
221 let triple = &sess.target.target.llvm_target[];
224 let triple = CString::from_slice(triple.as_bytes());
225 let cpu = match sess.opts.cg.target_cpu {
226 Some(ref s) => s.as_slice(),
227 None => sess.target.target.options.cpu.as_slice()
229 let cpu = CString::from_slice(cpu.as_bytes());
230 let features = CString::from_slice(target_feature(sess).as_bytes());
231 llvm::LLVMRustCreateTargetMachine(
232 triple.as_ptr(), cpu.as_ptr(), features.as_ptr(),
236 true /* EnableSegstk */,
239 !any_library && reloc_model == llvm::RelocPIC,
246 llvm_err(sess.diagnostic().handler(),
247 format!("Could not create LLVM TargetMachine for triple: {}",
248 triple).to_string());
255 /// Module-specific configuration for `optimize_and_codegen`.
257 struct ModuleConfig {
258 /// LLVM TargetMachine to use for codegen.
259 tm: TargetMachineRef,
260 /// Names of additional optimization passes to run.
262 /// Some(level) to optimize at a certain level, or None to run
263 /// absolutely no optimizations (used for the metadata module).
264 opt_level: Option<llvm::CodeGenOptLevel>,
266 // Flags indicating which outputs to produce.
267 emit_no_opt_bc: bool,
274 // Miscellaneous flags. These are mostly copied from command-line
277 no_prepopulate_passes: bool,
282 unsafe impl Send for ModuleConfig { }
285 fn new(tm: TargetMachineRef, passes: Vec<String>) -> ModuleConfig {
291 emit_no_opt_bc: false,
299 no_prepopulate_passes: false,
305 fn set_flags(&mut self, sess: &Session, trans: &CrateTranslation) {
306 self.no_verify = sess.no_verify();
307 self.no_prepopulate_passes = sess.opts.cg.no_prepopulate_passes;
308 self.no_builtins = trans.no_builtins;
309 self.time_passes = sess.time_passes();
313 /// Additional resources used by optimize_and_codegen (not module specific)
314 struct CodegenContext<'a> {
315 // Extra resources used for LTO: (sess, reachable). This will be `None`
316 // when running in a worker thread.
317 lto_ctxt: Option<(&'a Session, &'a [String])>,
318 // Handler to use for diagnostics produced during codegen.
319 handler: &'a Handler,
320 // LLVM optimizations for which we want to print remarks.
324 impl<'a> CodegenContext<'a> {
325 fn new_with_session(sess: &'a Session, reachable: &'a [String]) -> CodegenContext<'a> {
327 lto_ctxt: Some((sess, reachable)),
328 handler: sess.diagnostic().handler(),
329 remark: sess.opts.cg.remark.clone(),
334 struct HandlerFreeVars<'a> {
336 cgcx: &'a CodegenContext<'a>,
339 unsafe extern "C" fn inline_asm_handler(diag: SMDiagnosticRef,
342 use syntax::codemap::ExpnId;
344 let HandlerFreeVars { cgcx, .. }
345 = *mem::transmute::<_, *const HandlerFreeVars>(user);
347 let msg = llvm::build_string(|s| llvm::LLVMWriteSMDiagnosticToString(diag, s))
348 .expect("non-UTF8 SMDiagnostic");
350 match cgcx.lto_ctxt {
352 sess.codemap().with_expn_info(ExpnId::from_llvm_cookie(cookie), |info| match info {
353 Some(ei) => sess.span_err(ei.call_site, &msg[]),
354 None => sess.err(&msg[]),
359 cgcx.handler.err(&msg[]);
360 cgcx.handler.note("build without -C codegen-units for more exact errors");
365 unsafe extern "C" fn diagnostic_handler(info: DiagnosticInfoRef, user: *mut c_void) {
366 let HandlerFreeVars { llcx, cgcx }
367 = *mem::transmute::<_, *const HandlerFreeVars>(user);
369 match llvm::diagnostic::Diagnostic::unpack(info) {
370 llvm::diagnostic::Optimization(opt) => {
371 let pass_name = str::from_utf8(ffi::c_str_to_bytes(&opt.pass_name))
373 .expect("got a non-UTF8 pass name from LLVM");
374 let enabled = match cgcx.remark {
376 SomePasses(ref v) => v.iter().any(|s| *s == pass_name),
380 let loc = llvm::debug_loc_to_string(llcx, opt.debug_loc);
381 cgcx.handler.note(format!("optimization {} for {} at {}: {}",
384 if loc.is_empty() { "[unknown]" } else { loc.as_slice() },
385 llvm::twine_to_string(opt.message)).as_slice());
393 // Unsafe due to LLVM calls.
394 unsafe fn optimize_and_codegen(cgcx: &CodegenContext,
395 mtrans: ModuleTranslation,
396 config: ModuleConfig,
398 output_names: OutputFilenames) {
399 let ModuleTranslation { llmod, llcx } = mtrans;
402 // llcx doesn't outlive this function, so we can put this on the stack.
403 let fv = HandlerFreeVars {
407 let fv = &fv as *const HandlerFreeVars as *mut c_void;
409 llvm::LLVMSetInlineAsmDiagnosticHandler(llcx, inline_asm_handler, fv);
411 if !cgcx.remark.is_empty() {
412 llvm::LLVMContextSetDiagnosticHandler(llcx, diagnostic_handler, fv);
415 if config.emit_no_opt_bc {
416 let ext = format!("{}.no-opt.bc", name_extra);
417 let out = output_names.with_extension(ext.as_slice());
418 let out = CString::from_slice(out.as_vec());
419 llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr());
422 match config.opt_level {
424 // Create the two optimizing pass managers. These mirror what clang
425 // does, and are by populated by LLVM's default PassManagerBuilder.
426 // Each manager has a different set of passes, but they also share
427 // some common passes.
428 let fpm = llvm::LLVMCreateFunctionPassManagerForModule(llmod);
429 let mpm = llvm::LLVMCreatePassManager();
431 // If we're verifying or linting, add them to the function pass
433 let addpass = |&: pass: &str| {
434 let pass = CString::from_slice(pass.as_bytes());
435 llvm::LLVMRustAddPass(fpm, pass.as_ptr())
437 if !config.no_verify { assert!(addpass("verify")); }
439 if !config.no_prepopulate_passes {
440 llvm::LLVMRustAddAnalysisPasses(tm, fpm, llmod);
441 llvm::LLVMRustAddAnalysisPasses(tm, mpm, llmod);
442 populate_llvm_passes(fpm, mpm, llmod, opt_level,
446 for pass in config.passes.iter() {
447 let pass = CString::from_slice(pass.as_bytes());
448 if !llvm::LLVMRustAddPass(mpm, pass.as_ptr()) {
449 cgcx.handler.warn(format!("unknown pass {:?}, ignoring",
454 // Finally, run the actual optimization passes
455 time(config.time_passes, "llvm function passes", (), |()|
456 llvm::LLVMRustRunFunctionPassManager(fpm, llmod));
457 time(config.time_passes, "llvm module passes", (), |()|
458 llvm::LLVMRunPassManager(mpm, llmod));
460 // Deallocate managers that we're now done with
461 llvm::LLVMDisposePassManager(fpm);
462 llvm::LLVMDisposePassManager(mpm);
464 match cgcx.lto_ctxt {
465 Some((sess, reachable)) if sess.lto() => {
466 time(sess.time_passes(), "all lto passes", (), |()|
467 lto::run(sess, llmod, tm, reachable));
469 if config.emit_lto_bc {
470 let name = format!("{}.lto.bc", name_extra);
471 let out = output_names.with_extension(name.as_slice());
472 let out = CString::from_slice(out.as_vec());
473 llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr());
482 // A codegen-specific pass manager is used to generate object
483 // files for an LLVM module.
485 // Apparently each of these pass managers is a one-shot kind of
486 // thing, so we create a new one for each type of output. The
487 // pass manager passed to the closure should be ensured to not
488 // escape the closure itself, and the manager should only be
490 unsafe fn with_codegen<F>(tm: TargetMachineRef,
494 F: FnOnce(PassManagerRef),
496 let cpm = llvm::LLVMCreatePassManager();
497 llvm::LLVMRustAddAnalysisPasses(tm, cpm, llmod);
498 llvm::LLVMRustAddLibraryInfo(cpm, llmod, no_builtins);
500 llvm::LLVMDisposePassManager(cpm);
504 let ext = format!("{}.bc", name_extra);
505 let out = output_names.with_extension(ext.as_slice());
506 let out = CString::from_slice(out.as_vec());
507 llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr());
510 time(config.time_passes, "codegen passes", (), |()| {
512 let ext = format!("{}.ll", name_extra);
513 let out = output_names.with_extension(ext.as_slice());
514 let out = CString::from_slice(out.as_vec());
515 with_codegen(tm, llmod, config.no_builtins, |cpm| {
516 llvm::LLVMRustPrintModule(cpm, llmod, out.as_ptr());
521 let path = output_names.with_extension(&format!("{}.s", name_extra)[]);
522 with_codegen(tm, llmod, config.no_builtins, |cpm| {
523 write_output_file(cgcx.handler, tm, cpm, llmod, &path, llvm::AssemblyFileType);
528 let path = output_names.with_extension(&format!("{}.o", name_extra)[]);
529 with_codegen(tm, llmod, config.no_builtins, |cpm| {
530 write_output_file(cgcx.handler, tm, cpm, llmod, &path, llvm::ObjectFileType);
535 llvm::LLVMDisposeModule(llmod);
536 llvm::LLVMContextDispose(llcx);
537 llvm::LLVMRustDisposeTargetMachine(tm);
540 pub fn run_passes(sess: &Session,
541 trans: &CrateTranslation,
542 output_types: &[config::OutputType],
543 crate_output: &OutputFilenames) {
544 // It's possible that we have `codegen_units > 1` but only one item in
545 // `trans.modules`. We could theoretically proceed and do LTO in that
546 // case, but it would be confusing to have the validity of
547 // `-Z lto -C codegen-units=2` depend on details of the crate being
548 // compiled, so we complain regardless.
549 if sess.lto() && sess.opts.cg.codegen_units > 1 {
550 // This case is impossible to handle because LTO expects to be able
551 // to combine the entire crate and all its dependencies into a
552 // single compilation unit, but each codegen unit is in a separate
553 // LLVM context, so they can't easily be combined.
554 sess.fatal("can't perform LTO when using multiple codegen units");
558 assert!(trans.modules.len() == sess.opts.cg.codegen_units);
561 configure_llvm(sess);
564 let tm = create_target_machine(sess);
566 // Figure out what we actually need to build.
568 let mut modules_config = ModuleConfig::new(tm, sess.opts.cg.passes.clone());
569 let mut metadata_config = ModuleConfig::new(tm, vec!());
571 modules_config.opt_level = Some(get_llvm_opt_level(sess.opts.optimize));
573 // Save all versions of the bytecode if we're saving our temporaries.
574 if sess.opts.cg.save_temps {
575 modules_config.emit_no_opt_bc = true;
576 modules_config.emit_bc = true;
577 modules_config.emit_lto_bc = true;
578 metadata_config.emit_bc = true;
581 // Emit bitcode files for the crate if we're emitting an rlib.
582 // Whenever an rlib is created, the bitcode is inserted into the
583 // archive in order to allow LTO against it.
584 let needs_crate_bitcode =
585 sess.crate_types.borrow().contains(&config::CrateTypeRlib) &&
586 sess.opts.output_types.contains(&config::OutputTypeExe);
587 if needs_crate_bitcode {
588 modules_config.emit_bc = true;
591 for output_type in output_types.iter() {
593 config::OutputTypeBitcode => { modules_config.emit_bc = true; },
594 config::OutputTypeLlvmAssembly => { modules_config.emit_ir = true; },
595 config::OutputTypeAssembly => {
596 modules_config.emit_asm = true;
597 // If we're not using the LLVM assembler, this function
598 // could be invoked specially with output_type_assembly, so
599 // in this case we still want the metadata object file.
600 if !sess.opts.output_types.contains(&config::OutputTypeAssembly) {
601 metadata_config.emit_obj = true;
604 config::OutputTypeObject => { modules_config.emit_obj = true; },
605 config::OutputTypeExe => {
606 modules_config.emit_obj = true;
607 metadata_config.emit_obj = true;
609 config::OutputTypeDepInfo => {}
613 modules_config.set_flags(sess, trans);
614 metadata_config.set_flags(sess, trans);
617 // Populate a buffer with a list of codegen tasks. Items are processed in
618 // LIFO order, just because it's a tiny bit simpler that way. (The order
619 // doesn't actually matter.)
620 let mut work_items = Vec::with_capacity(1 + trans.modules.len());
623 let work = build_work_item(sess,
624 trans.metadata_module,
625 metadata_config.clone(),
626 crate_output.clone(),
627 "metadata".to_string());
628 work_items.push(work);
631 for (index, mtrans) in trans.modules.iter().enumerate() {
632 let work = build_work_item(sess,
634 modules_config.clone(),
635 crate_output.clone(),
636 format!("{}", index));
637 work_items.push(work);
640 // Process the work items, optionally using worker threads.
641 if sess.opts.cg.codegen_units == 1 {
642 run_work_singlethreaded(sess, &trans.reachable[], work_items);
644 run_work_multithreaded(sess, work_items, sess.opts.cg.codegen_units);
647 // All codegen is finished.
649 llvm::LLVMRustDisposeTargetMachine(tm);
652 // Produce final compile outputs.
654 let copy_if_one_unit = |&: ext: &str, output_type: config::OutputType, keep_numbered: bool| {
656 if sess.opts.cg.codegen_units == 1 {
657 // 1) Only one codegen unit. In this case it's no difficulty
658 // to copy `foo.0.x` to `foo.x`.
659 fs::copy(&crate_output.with_extension(ext),
660 &crate_output.path(output_type)).unwrap();
661 if !sess.opts.cg.save_temps && !keep_numbered {
662 // The user just wants `foo.x`, not `foo.0.x`.
663 remove(sess, &crate_output.with_extension(ext));
666 if crate_output.single_output_file.is_some() {
667 // 2) Multiple codegen units, with `-o some_name`. We have
668 // no good solution for this case, so warn the user.
669 sess.warn(&format!("ignoring -o because multiple .{} files were produced",
672 // 3) Multiple codegen units, but no `-o some_name`. We
673 // just leave the `foo.0.x` files in place.
674 // (We don't have to do any work in this case.)
679 let link_obj = |&: output_path: &Path| {
680 // Running `ld -r` on a single input is kind of pointless.
681 if sess.opts.cg.codegen_units == 1 {
682 fs::copy(&crate_output.with_extension("0.o"),
683 output_path).unwrap();
684 // Leave the .0.o file around, to mimic the behavior of the normal
689 // Some builds of MinGW GCC will pass --force-exe-suffix to ld, which
690 // will automatically add a .exe extension if the extension is not
691 // already .exe or .dll. To ensure consistent behavior on Windows, we
692 // add the .exe suffix explicitly and then rename the output file to
693 // the desired path. This will give the correct behavior whether or
694 // not GCC adds --force-exe-suffix.
695 let windows_output_path =
696 if sess.target.target.options.is_like_windows {
697 Some(output_path.with_extension("o.exe"))
702 let pname = get_cc_prog(sess);
703 let mut cmd = Command::new(&pname[]);
705 cmd.args(&sess.target.target.options.pre_link_args[]);
706 cmd.arg("-nostdlib");
708 for index in range(0, trans.modules.len()) {
709 cmd.arg(crate_output.with_extension(&format!("{}.o", index)[]));
714 .arg(windows_output_path.as_ref().unwrap_or(output_path));
716 cmd.args(&sess.target.target.options.post_link_args[]);
718 if sess.opts.debugging_opts.print_link_args {
719 println!("{}", &cmd);
722 cmd.stdin(::std::io::process::Ignored)
723 .stdout(::std::io::process::InheritFd(1))
724 .stderr(::std::io::process::InheritFd(2));
727 if !status.success() {
728 sess.err(&format!("linking of {} with `{}` failed",
729 output_path.display(), cmd)[]);
730 sess.abort_if_errors();
734 sess.err(&format!("could not exec the linker `{}`: {}",
737 sess.abort_if_errors();
741 match windows_output_path {
742 Some(ref windows_path) => {
743 fs::rename(windows_path, output_path).unwrap();
746 // The file is already named according to `output_path`.
751 // Flag to indicate whether the user explicitly requested bitcode.
752 // Otherwise, we produced it only as a temporary output, and will need
754 let mut user_wants_bitcode = false;
755 for output_type in output_types.iter() {
757 config::OutputTypeBitcode => {
758 user_wants_bitcode = true;
759 // Copy to .bc, but always keep the .0.bc. There is a later
760 // check to figure out if we should delete .0.bc files, or keep
761 // them for making an rlib.
762 copy_if_one_unit("0.bc", config::OutputTypeBitcode, true);
764 config::OutputTypeLlvmAssembly => {
765 copy_if_one_unit("0.ll", config::OutputTypeLlvmAssembly, false);
767 config::OutputTypeAssembly => {
768 copy_if_one_unit("0.s", config::OutputTypeAssembly, false);
770 config::OutputTypeObject => {
771 link_obj(&crate_output.path(config::OutputTypeObject));
773 config::OutputTypeExe => {
774 // If config::OutputTypeObject is already in the list, then
775 // `crate.o` will be handled by the config::OutputTypeObject case.
776 // Otherwise, we need to create the temporary object so we
777 // can run the linker.
778 if !sess.opts.output_types.contains(&config::OutputTypeObject) {
779 link_obj(&crate_output.temp_path(config::OutputTypeObject));
782 config::OutputTypeDepInfo => {}
785 let user_wants_bitcode = user_wants_bitcode;
787 // Clean up unwanted temporary files.
789 // We create the following files by default:
792 // - crate.metadata.bc
793 // - crate.metadata.o
794 // - crate.o (linked from crate.##.o)
795 // - crate.bc (copied from crate.0.bc)
796 // We may create additional files if requested by the user (through
797 // `-C save-temps` or `--emit=` flags).
799 if !sess.opts.cg.save_temps {
800 // Remove the temporary .0.o objects. If the user didn't
801 // explicitly request bitcode (with --emit=bc), and the bitcode is not
802 // needed for building an rlib, then we must remove .0.bc as well.
804 // Specific rules for keeping .0.bc:
805 // - If we're building an rlib (`needs_crate_bitcode`), then keep
807 // - If the user requested bitcode (`user_wants_bitcode`), and
808 // codegen_units > 1, then keep it.
809 // - If the user requested bitcode but codegen_units == 1, then we
810 // can toss .0.bc because we copied it to .bc earlier.
811 // - If we're not building an rlib and the user didn't request
812 // bitcode, then delete .0.bc.
813 // If you change how this works, also update back::link::link_rlib,
814 // where .0.bc files are (maybe) deleted after making an rlib.
815 let keep_numbered_bitcode = needs_crate_bitcode ||
816 (user_wants_bitcode && sess.opts.cg.codegen_units > 1);
818 for i in range(0, trans.modules.len()) {
819 if modules_config.emit_obj {
820 let ext = format!("{}.o", i);
821 remove(sess, &crate_output.with_extension(&ext[]));
824 if modules_config.emit_bc && !keep_numbered_bitcode {
825 let ext = format!("{}.bc", i);
826 remove(sess, &crate_output.with_extension(&ext[]));
830 if metadata_config.emit_bc && !user_wants_bitcode {
831 remove(sess, &crate_output.with_extension("metadata.bc"));
835 // We leave the following files around by default:
837 // - crate.metadata.o
839 // These are used in linking steps and will be cleaned up afterward.
841 // FIXME: time_llvm_passes support - does this use a global context or
843 //if sess.time_llvm_passes() { llvm::LLVMRustPrintPassTimings(); }
847 mtrans: ModuleTranslation,
848 config: ModuleConfig,
849 output_names: OutputFilenames,
853 fn build_work_item(sess: &Session,
854 mtrans: ModuleTranslation,
855 config: ModuleConfig,
856 output_names: OutputFilenames,
860 let mut config = config;
861 config.tm = create_target_machine(sess);
862 WorkItem { mtrans: mtrans, config: config, output_names: output_names,
863 name_extra: name_extra }
866 fn execute_work_item(cgcx: &CodegenContext,
867 work_item: WorkItem) {
869 optimize_and_codegen(cgcx, work_item.mtrans, work_item.config,
870 work_item.name_extra, work_item.output_names);
874 fn run_work_singlethreaded(sess: &Session,
875 reachable: &[String],
876 work_items: Vec<WorkItem>) {
877 let cgcx = CodegenContext::new_with_session(sess, reachable);
878 let mut work_items = work_items;
880 // Since we're running single-threaded, we can pass the session to
881 // the proc, allowing `optimize_and_codegen` to perform LTO.
882 for work in Unfold::new((), |_| work_items.pop()) {
883 execute_work_item(&cgcx, work);
887 fn run_work_multithreaded(sess: &Session,
888 work_items: Vec<WorkItem>,
890 // Run some workers to process the work items.
891 let work_items_arc = Arc::new(Mutex::new(work_items));
892 let mut diag_emitter = SharedEmitter::new();
893 let mut futures = Vec::with_capacity(num_workers);
895 for i in range(0, num_workers) {
896 let work_items_arc = work_items_arc.clone();
897 let diag_emitter = diag_emitter.clone();
898 let remark = sess.opts.cg.remark.clone();
900 let (tx, rx) = channel();
901 let mut tx = Some(tx);
904 thread::Builder::new().name(format!("codegen-{}", i)).spawn(move |:| {
905 let diag_handler = mk_handler(box diag_emitter);
907 // Must construct cgcx inside the proc because it has non-Send
909 let cgcx = CodegenContext {
911 handler: &diag_handler,
916 // Avoid holding the lock for the entire duration of the match.
917 let maybe_work = work_items_arc.lock().unwrap().pop();
920 execute_work_item(&cgcx, work);
922 // Make sure to fail the worker so the main thread can
923 // tell that there were errors.
924 cgcx.handler.abort_if_errors();
930 tx.take().unwrap().send(()).unwrap();
934 let mut panicked = false;
935 for rx in futures.into_iter() {
942 // Display any new diagnostics.
943 diag_emitter.dump(sess.diagnostic().handler());
946 sess.fatal("aborting due to worker thread panic");
950 pub fn run_assembler(sess: &Session, outputs: &OutputFilenames) {
951 let pname = get_cc_prog(sess);
952 let mut cmd = Command::new(&pname[]);
954 cmd.arg("-c").arg("-o").arg(outputs.path(config::OutputTypeObject))
955 .arg(outputs.temp_path(config::OutputTypeAssembly));
960 if !prog.status.success() {
961 sess.err(&format!("linking with `{}` failed: {}",
964 sess.note(&format!("{}", &cmd)[]);
965 let mut note = prog.error.clone();
966 note.push_all(&prog.output[]);
967 sess.note(str::from_utf8(¬e[]).unwrap());
968 sess.abort_if_errors();
972 sess.err(&format!("could not exec the linker `{}`: {}",
975 sess.abort_if_errors();
980 unsafe fn configure_llvm(sess: &Session) {
981 use std::sync::{Once, ONCE_INIT};
982 static INIT: Once = ONCE_INIT;
984 // Copy what clang does by turning on loop vectorization at O2 and
985 // slp vectorization at O3
986 let vectorize_loop = !sess.opts.cg.no_vectorize_loops &&
987 (sess.opts.optimize == config::Default ||
988 sess.opts.optimize == config::Aggressive);
989 let vectorize_slp = !sess.opts.cg.no_vectorize_slp &&
990 sess.opts.optimize == config::Aggressive;
992 let mut llvm_c_strs = Vec::new();
993 let mut llvm_args = Vec::new();
995 let mut add = |&mut : arg: &str| {
996 let s = CString::from_slice(arg.as_bytes());
997 llvm_args.push(s.as_ptr());
1000 add("rustc"); // fake program name
1001 if vectorize_loop { add("-vectorize-loops"); }
1002 if vectorize_slp { add("-vectorize-slp"); }
1003 if sess.time_llvm_passes() { add("-time-passes"); }
1004 if sess.print_llvm_passes() { add("-debug-pass=Structure"); }
1006 for arg in sess.opts.cg.llvm_args.iter() {
1012 llvm::LLVMInitializePasses();
1014 // Only initialize the platforms supported by Rust here, because
1015 // using --llvm-root will have multiple platforms that rustllvm
1016 // doesn't actually link to and it's pointless to put target info
1017 // into the registry that Rust cannot generate machine code for.
1018 llvm::LLVMInitializeX86TargetInfo();
1019 llvm::LLVMInitializeX86Target();
1020 llvm::LLVMInitializeX86TargetMC();
1021 llvm::LLVMInitializeX86AsmPrinter();
1022 llvm::LLVMInitializeX86AsmParser();
1024 llvm::LLVMInitializeARMTargetInfo();
1025 llvm::LLVMInitializeARMTarget();
1026 llvm::LLVMInitializeARMTargetMC();
1027 llvm::LLVMInitializeARMAsmPrinter();
1028 llvm::LLVMInitializeARMAsmParser();
1030 llvm::LLVMInitializeAArch64TargetInfo();
1031 llvm::LLVMInitializeAArch64Target();
1032 llvm::LLVMInitializeAArch64TargetMC();
1033 llvm::LLVMInitializeAArch64AsmPrinter();
1034 llvm::LLVMInitializeAArch64AsmParser();
1036 llvm::LLVMInitializeMipsTargetInfo();
1037 llvm::LLVMInitializeMipsTarget();
1038 llvm::LLVMInitializeMipsTargetMC();
1039 llvm::LLVMInitializeMipsAsmPrinter();
1040 llvm::LLVMInitializeMipsAsmParser();
1042 llvm::LLVMInitializePowerPCTargetInfo();
1043 llvm::LLVMInitializePowerPCTarget();
1044 llvm::LLVMInitializePowerPCTargetMC();
1045 llvm::LLVMInitializePowerPCAsmPrinter();
1046 llvm::LLVMInitializePowerPCAsmParser();
1048 llvm::LLVMRustSetLLVMOptions(llvm_args.len() as c_int,
1049 llvm_args.as_ptr());
1053 unsafe fn populate_llvm_passes(fpm: llvm::PassManagerRef,
1054 mpm: llvm::PassManagerRef,
1056 opt: llvm::CodeGenOptLevel,
1057 no_builtins: bool) {
1058 // Create the PassManagerBuilder for LLVM. We configure it with
1059 // reasonable defaults and prepare it to actually populate the pass
1061 let builder = llvm::LLVMPassManagerBuilderCreate();
1063 llvm::CodeGenLevelNone => {
1064 // Don't add lifetime intrinsics at O0
1065 llvm::LLVMRustAddAlwaysInlinePass(builder, false);
1067 llvm::CodeGenLevelLess => {
1068 llvm::LLVMRustAddAlwaysInlinePass(builder, true);
1070 // numeric values copied from clang
1071 llvm::CodeGenLevelDefault => {
1072 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder,
1075 llvm::CodeGenLevelAggressive => {
1076 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder,
1080 llvm::LLVMPassManagerBuilderSetOptLevel(builder, opt as c_uint);
1081 llvm::LLVMRustAddBuilderLibraryInfo(builder, llmod, no_builtins);
1083 // Use the builder to populate the function/module pass managers.
1084 llvm::LLVMPassManagerBuilderPopulateFunctionPassManager(builder, fpm);
1085 llvm::LLVMPassManagerBuilderPopulateModulePassManager(builder, mpm);
1086 llvm::LLVMPassManagerBuilderDispose(builder);
1089 llvm::CodeGenLevelDefault | llvm::CodeGenLevelAggressive => {
1090 llvm::LLVMRustAddPass(mpm, "mergefunc\0".as_ptr() as *const _);