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::c_str::{ToCStr, CString};
28 use std::iter::Unfold;
32 use std::sync::{Arc, Mutex};
33 use std::sync::mpsc::channel;
35 use libc::{c_uint, c_int, c_void};
37 #[deriving(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() {
52 let err = CString::new(cstr, true);
53 let err = String::from_utf8_lossy(err.as_bytes());
54 handler.fatal(format!("{}: {}",
61 pub fn write_output_file(
62 handler: &diagnostic::Handler,
63 target: llvm::TargetMachineRef,
64 pm: llvm::PassManagerRef,
67 file_type: llvm::FileType) {
69 output.with_c_str(|output| {
70 let result = llvm::LLVMRustWriteOutputFile(
71 target, pm, m, output, file_type);
73 llvm_err(handler, "could not write output".to_string());
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 triple.with_c_str(|t| {
225 let cpu = match sess.opts.cg.target_cpu {
227 None => sess.target.target.options.cpu[]
229 cpu.with_c_str(|cpu| {
230 target_feature(sess).with_c_str(|features| {
231 llvm::LLVMRustCreateTargetMachine(
236 true /* EnableSegstk */,
239 !any_library && reloc_model == llvm::RelocPIC,
249 llvm_err(sess.diagnostic().handler(),
250 format!("Could not create LLVM TargetMachine for triple: {}",
251 triple).to_string());
258 /// Module-specific configuration for `optimize_and_codegen`.
260 struct ModuleConfig {
261 /// LLVM TargetMachine to use for codegen.
262 tm: TargetMachineRef,
263 /// Names of additional optimization passes to run.
265 /// Some(level) to optimize at a certain level, or None to run
266 /// absolutely no optimizations (used for the metadata module).
267 opt_level: Option<llvm::CodeGenOptLevel>,
269 // Flags indicating which outputs to produce.
270 emit_no_opt_bc: bool,
277 // Miscellaneous flags. These are mostly copied from command-line
280 no_prepopulate_passes: bool,
285 unsafe impl Send for ModuleConfig { }
288 fn new(tm: TargetMachineRef, passes: Vec<String>) -> ModuleConfig {
294 emit_no_opt_bc: false,
302 no_prepopulate_passes: false,
308 fn set_flags(&mut self, sess: &Session, trans: &CrateTranslation) {
309 self.no_verify = sess.no_verify();
310 self.no_prepopulate_passes = sess.opts.cg.no_prepopulate_passes;
311 self.no_builtins = trans.no_builtins;
312 self.time_passes = sess.time_passes();
316 /// Additional resources used by optimize_and_codegen (not module specific)
317 struct CodegenContext<'a> {
318 // Extra resources used for LTO: (sess, reachable). This will be `None`
319 // when running in a worker thread.
320 lto_ctxt: Option<(&'a Session, &'a [String])>,
321 // Handler to use for diagnostics produced during codegen.
322 handler: &'a Handler,
323 // LLVM optimizations for which we want to print remarks.
327 impl<'a> CodegenContext<'a> {
328 fn new_with_session(sess: &'a Session, reachable: &'a [String]) -> CodegenContext<'a> {
330 lto_ctxt: Some((sess, reachable)),
331 handler: sess.diagnostic().handler(),
332 remark: sess.opts.cg.remark.clone(),
337 struct HandlerFreeVars<'a> {
339 cgcx: &'a CodegenContext<'a>,
342 unsafe extern "C" fn inline_asm_handler(diag: SMDiagnosticRef,
345 use syntax::codemap::ExpnId;
347 let HandlerFreeVars { cgcx, .. }
348 = *mem::transmute::<_, *const HandlerFreeVars>(user);
350 let msg = llvm::build_string(|s| llvm::LLVMWriteSMDiagnosticToString(diag, s))
351 .expect("non-UTF8 SMDiagnostic");
353 match cgcx.lto_ctxt {
355 sess.codemap().with_expn_info(ExpnId::from_llvm_cookie(cookie), |info| match info {
356 Some(ei) => sess.span_err(ei.call_site, msg[]),
357 None => sess.err(msg[]),
362 cgcx.handler.err(msg[]);
363 cgcx.handler.note("build without -C codegen-units for more exact errors");
368 unsafe extern "C" fn diagnostic_handler(info: DiagnosticInfoRef, user: *mut c_void) {
369 let HandlerFreeVars { llcx, cgcx }
370 = *mem::transmute::<_, *const HandlerFreeVars>(user);
372 match llvm::diagnostic::Diagnostic::unpack(info) {
373 llvm::diagnostic::Optimization(opt) => {
374 let pass_name = CString::new(opt.pass_name, false);
375 let pass_name = pass_name.as_str().expect("got a non-UTF8 pass name from LLVM");
376 let enabled = match cgcx.remark {
378 SomePasses(ref v) => v.iter().any(|s| *s == pass_name),
382 let loc = llvm::debug_loc_to_string(llcx, opt.debug_loc);
383 cgcx.handler.note(format!("optimization {} for {} at {}: {}",
386 if loc.is_empty() { "[unknown]" } else { loc[] },
387 llvm::twine_to_string(opt.message))[]);
395 // Unsafe due to LLVM calls.
396 unsafe fn optimize_and_codegen(cgcx: &CodegenContext,
397 mtrans: ModuleTranslation,
398 config: ModuleConfig,
400 output_names: OutputFilenames) {
401 let ModuleTranslation { llmod, llcx } = mtrans;
404 // llcx doesn't outlive this function, so we can put this on the stack.
405 let fv = HandlerFreeVars {
409 let fv = &fv as *const HandlerFreeVars as *mut c_void;
411 llvm::LLVMSetInlineAsmDiagnosticHandler(llcx, inline_asm_handler, fv);
413 if !cgcx.remark.is_empty() {
414 llvm::LLVMContextSetDiagnosticHandler(llcx, diagnostic_handler, fv);
417 if config.emit_no_opt_bc {
418 let ext = format!("{}.no-opt.bc", name_extra);
419 output_names.with_extension(ext[]).with_c_str(|buf| {
420 llvm::LLVMWriteBitcodeToFile(llmod, buf);
424 match config.opt_level {
426 // Create the two optimizing pass managers. These mirror what clang
427 // does, and are by populated by LLVM's default PassManagerBuilder.
428 // Each manager has a different set of passes, but they also share
429 // some common passes.
430 let fpm = llvm::LLVMCreateFunctionPassManagerForModule(llmod);
431 let mpm = llvm::LLVMCreatePassManager();
433 // If we're verifying or linting, add them to the function pass
435 let addpass = |&: pass: &str| {
436 pass.with_c_str(|s| llvm::LLVMRustAddPass(fpm, s))
438 if !config.no_verify { assert!(addpass("verify")); }
440 if !config.no_prepopulate_passes {
441 llvm::LLVMRustAddAnalysisPasses(tm, fpm, llmod);
442 llvm::LLVMRustAddAnalysisPasses(tm, mpm, llmod);
443 populate_llvm_passes(fpm, mpm, llmod, opt_level,
447 for pass in config.passes.iter() {
448 pass.with_c_str(|s| {
449 if !llvm::LLVMRustAddPass(mpm, s) {
450 cgcx.handler.warn(format!("unknown pass {}, ignoring",
456 // Finally, run the actual optimization passes
457 time(config.time_passes, "llvm function passes", (), |()|
458 llvm::LLVMRustRunFunctionPassManager(fpm, llmod));
459 time(config.time_passes, "llvm module passes", (), |()|
460 llvm::LLVMRunPassManager(mpm, llmod));
462 // Deallocate managers that we're now done with
463 llvm::LLVMDisposePassManager(fpm);
464 llvm::LLVMDisposePassManager(mpm);
466 match cgcx.lto_ctxt {
467 Some((sess, reachable)) if sess.lto() => {
468 time(sess.time_passes(), "all lto passes", (), |()|
469 lto::run(sess, llmod, tm, reachable));
471 if config.emit_lto_bc {
472 let name = format!("{}.lto.bc", name_extra);
473 output_names.with_extension(name[]).with_c_str(|buf| {
474 llvm::LLVMWriteBitcodeToFile(llmod, buf);
484 // A codegen-specific pass manager is used to generate object
485 // files for an LLVM module.
487 // Apparently each of these pass managers is a one-shot kind of
488 // thing, so we create a new one for each type of output. The
489 // pass manager passed to the closure should be ensured to not
490 // escape the closure itself, and the manager should only be
492 unsafe fn with_codegen<F>(tm: TargetMachineRef,
496 F: FnOnce(PassManagerRef),
498 let cpm = llvm::LLVMCreatePassManager();
499 llvm::LLVMRustAddAnalysisPasses(tm, cpm, llmod);
500 llvm::LLVMRustAddLibraryInfo(cpm, llmod, no_builtins);
502 llvm::LLVMDisposePassManager(cpm);
506 let ext = format!("{}.bc", name_extra);
507 output_names.with_extension(ext[]).with_c_str(|buf| {
508 llvm::LLVMWriteBitcodeToFile(llmod, buf);
512 time(config.time_passes, "codegen passes", (), |()| {
514 let ext = format!("{}.ll", name_extra);
515 output_names.with_extension(ext[]).with_c_str(|output| {
516 with_codegen(tm, llmod, config.no_builtins, |cpm| {
517 llvm::LLVMRustPrintModule(cpm, llmod, output);
523 let path = output_names.with_extension(format!("{}.s", name_extra)[]);
524 with_codegen(tm, llmod, config.no_builtins, |cpm| {
525 write_output_file(cgcx.handler, tm, cpm, llmod, &path, llvm::AssemblyFileType);
530 let path = output_names.with_extension(format!("{}.o", name_extra)[]);
531 with_codegen(tm, llmod, config.no_builtins, |cpm| {
532 write_output_file(cgcx.handler, tm, cpm, llmod, &path, llvm::ObjectFileType);
537 llvm::LLVMDisposeModule(llmod);
538 llvm::LLVMContextDispose(llcx);
539 llvm::LLVMRustDisposeTargetMachine(tm);
542 pub fn run_passes(sess: &Session,
543 trans: &CrateTranslation,
544 output_types: &[config::OutputType],
545 crate_output: &OutputFilenames) {
546 // It's possible that we have `codegen_units > 1` but only one item in
547 // `trans.modules`. We could theoretically proceed and do LTO in that
548 // case, but it would be confusing to have the validity of
549 // `-Z lto -C codegen-units=2` depend on details of the crate being
550 // compiled, so we complain regardless.
551 if sess.lto() && sess.opts.cg.codegen_units > 1 {
552 // This case is impossible to handle because LTO expects to be able
553 // to combine the entire crate and all its dependencies into a
554 // single compilation unit, but each codegen unit is in a separate
555 // LLVM context, so they can't easily be combined.
556 sess.fatal("can't perform LTO when using multiple codegen units");
560 assert!(trans.modules.len() == sess.opts.cg.codegen_units);
563 configure_llvm(sess);
566 let tm = create_target_machine(sess);
568 // Figure out what we actually need to build.
570 let mut modules_config = ModuleConfig::new(tm, sess.opts.cg.passes.clone());
571 let mut metadata_config = ModuleConfig::new(tm, vec!());
573 modules_config.opt_level = Some(get_llvm_opt_level(sess.opts.optimize));
575 // Save all versions of the bytecode if we're saving our temporaries.
576 if sess.opts.cg.save_temps {
577 modules_config.emit_no_opt_bc = true;
578 modules_config.emit_bc = true;
579 modules_config.emit_lto_bc = true;
580 metadata_config.emit_bc = true;
583 // Emit bitcode files for the crate if we're emitting an rlib.
584 // Whenever an rlib is created, the bitcode is inserted into the
585 // archive in order to allow LTO against it.
586 let needs_crate_bitcode =
587 sess.crate_types.borrow().contains(&config::CrateTypeRlib) &&
588 sess.opts.output_types.contains(&config::OutputTypeExe);
589 if needs_crate_bitcode {
590 modules_config.emit_bc = true;
593 for output_type in output_types.iter() {
595 config::OutputTypeBitcode => { modules_config.emit_bc = true; },
596 config::OutputTypeLlvmAssembly => { modules_config.emit_ir = true; },
597 config::OutputTypeAssembly => {
598 modules_config.emit_asm = true;
599 // If we're not using the LLVM assembler, this function
600 // could be invoked specially with output_type_assembly, so
601 // in this case we still want the metadata object file.
602 if !sess.opts.output_types.contains(&config::OutputTypeAssembly) {
603 metadata_config.emit_obj = true;
606 config::OutputTypeObject => { modules_config.emit_obj = true; },
607 config::OutputTypeExe => {
608 modules_config.emit_obj = true;
609 metadata_config.emit_obj = true;
611 config::OutputTypeDepInfo => {}
615 modules_config.set_flags(sess, trans);
616 metadata_config.set_flags(sess, trans);
619 // Populate a buffer with a list of codegen tasks. Items are processed in
620 // LIFO order, just because it's a tiny bit simpler that way. (The order
621 // doesn't actually matter.)
622 let mut work_items = Vec::with_capacity(1 + trans.modules.len());
625 let work = build_work_item(sess,
626 trans.metadata_module,
627 metadata_config.clone(),
628 crate_output.clone(),
629 "metadata".to_string());
630 work_items.push(work);
633 for (index, mtrans) in trans.modules.iter().enumerate() {
634 let work = build_work_item(sess,
636 modules_config.clone(),
637 crate_output.clone(),
638 format!("{}", index));
639 work_items.push(work);
642 // Process the work items, optionally using worker threads.
643 if sess.opts.cg.codegen_units == 1 {
644 run_work_singlethreaded(sess, trans.reachable[], work_items);
646 run_work_multithreaded(sess, work_items, sess.opts.cg.codegen_units);
649 // All codegen is finished.
651 llvm::LLVMRustDisposeTargetMachine(tm);
654 // Produce final compile outputs.
656 let copy_if_one_unit = |&: ext: &str, output_type: config::OutputType, keep_numbered: bool| {
658 if sess.opts.cg.codegen_units == 1 {
659 // 1) Only one codegen unit. In this case it's no difficulty
660 // to copy `foo.0.x` to `foo.x`.
661 fs::copy(&crate_output.with_extension(ext),
662 &crate_output.path(output_type)).unwrap();
663 if !sess.opts.cg.save_temps && !keep_numbered {
664 // The user just wants `foo.x`, not `foo.0.x`.
665 remove(sess, &crate_output.with_extension(ext));
668 if crate_output.single_output_file.is_some() {
669 // 2) Multiple codegen units, with `-o some_name`. We have
670 // no good solution for this case, so warn the user.
671 sess.warn(format!("ignoring -o because multiple .{} files were produced",
674 // 3) Multiple codegen units, but no `-o some_name`. We
675 // just leave the `foo.0.x` files in place.
676 // (We don't have to do any work in this case.)
681 let link_obj = |&: output_path: &Path| {
682 // Running `ld -r` on a single input is kind of pointless.
683 if sess.opts.cg.codegen_units == 1 {
684 fs::copy(&crate_output.with_extension("0.o"),
685 output_path).unwrap();
686 // Leave the .0.o file around, to mimic the behavior of the normal
691 // Some builds of MinGW GCC will pass --force-exe-suffix to ld, which
692 // will automatically add a .exe extension if the extension is not
693 // already .exe or .dll. To ensure consistent behavior on Windows, we
694 // add the .exe suffix explicitly and then rename the output file to
695 // the desired path. This will give the correct behavior whether or
696 // not GCC adds --force-exe-suffix.
697 let windows_output_path =
698 if sess.target.target.options.is_like_windows {
699 Some(output_path.with_extension("o.exe"))
704 let pname = get_cc_prog(sess);
705 let mut cmd = Command::new(pname[]);
707 cmd.args(sess.target.target.options.pre_link_args[]);
708 cmd.arg("-nostdlib");
710 for index in range(0, trans.modules.len()) {
711 cmd.arg(crate_output.with_extension(format!("{}.o", index)[]));
716 .arg(windows_output_path.as_ref().unwrap_or(output_path));
718 cmd.args(sess.target.target.options.post_link_args[]);
720 if (sess.opts.debugging_opts & config::PRINT_LINK_ARGS) != 0 {
721 println!("{}", &cmd);
724 cmd.stdin(::std::io::process::Ignored)
725 .stdout(::std::io::process::InheritFd(1))
726 .stderr(::std::io::process::InheritFd(2));
729 if !status.success() {
730 sess.err(format!("linking of {} with `{}` failed",
731 output_path.display(), cmd)[]);
732 sess.abort_if_errors();
736 sess.err(format!("could not exec the linker `{}`: {}",
739 sess.abort_if_errors();
743 match windows_output_path {
744 Some(ref windows_path) => {
745 fs::rename(windows_path, output_path).unwrap();
748 // The file is already named according to `output_path`.
753 // Flag to indicate whether the user explicitly requested bitcode.
754 // Otherwise, we produced it only as a temporary output, and will need
756 let mut user_wants_bitcode = false;
757 for output_type in output_types.iter() {
759 config::OutputTypeBitcode => {
760 user_wants_bitcode = true;
761 // Copy to .bc, but always keep the .0.bc. There is a later
762 // check to figure out if we should delete .0.bc files, or keep
763 // them for making an rlib.
764 copy_if_one_unit("0.bc", config::OutputTypeBitcode, true);
766 config::OutputTypeLlvmAssembly => {
767 copy_if_one_unit("0.ll", config::OutputTypeLlvmAssembly, false);
769 config::OutputTypeAssembly => {
770 copy_if_one_unit("0.s", config::OutputTypeAssembly, false);
772 config::OutputTypeObject => {
773 link_obj(&crate_output.path(config::OutputTypeObject));
775 config::OutputTypeExe => {
776 // If config::OutputTypeObject is already in the list, then
777 // `crate.o` will be handled by the config::OutputTypeObject case.
778 // Otherwise, we need to create the temporary object so we
779 // can run the linker.
780 if !sess.opts.output_types.contains(&config::OutputTypeObject) {
781 link_obj(&crate_output.temp_path(config::OutputTypeObject));
784 config::OutputTypeDepInfo => {}
787 let user_wants_bitcode = user_wants_bitcode;
789 // Clean up unwanted temporary files.
791 // We create the following files by default:
794 // - crate.metadata.bc
795 // - crate.metadata.o
796 // - crate.o (linked from crate.##.o)
797 // - crate.bc (copied from crate.0.bc)
798 // We may create additional files if requested by the user (through
799 // `-C save-temps` or `--emit=` flags).
801 if !sess.opts.cg.save_temps {
802 // Remove the temporary .0.o objects. If the user didn't
803 // explicitly request bitcode (with --emit=bc), and the bitcode is not
804 // needed for building an rlib, then we must remove .0.bc as well.
806 // Specific rules for keeping .0.bc:
807 // - If we're building an rlib (`needs_crate_bitcode`), then keep
809 // - If the user requested bitcode (`user_wants_bitcode`), and
810 // codegen_units > 1, then keep it.
811 // - If the user requested bitcode but codegen_units == 1, then we
812 // can toss .0.bc because we copied it to .bc earlier.
813 // - If we're not building an rlib and the user didn't request
814 // bitcode, then delete .0.bc.
815 // If you change how this works, also update back::link::link_rlib,
816 // where .0.bc files are (maybe) deleted after making an rlib.
817 let keep_numbered_bitcode = needs_crate_bitcode ||
818 (user_wants_bitcode && sess.opts.cg.codegen_units > 1);
820 for i in range(0, trans.modules.len()) {
821 if modules_config.emit_obj {
822 let ext = format!("{}.o", i);
823 remove(sess, &crate_output.with_extension(ext[]));
826 if modules_config.emit_bc && !keep_numbered_bitcode {
827 let ext = format!("{}.bc", i);
828 remove(sess, &crate_output.with_extension(ext[]));
832 if metadata_config.emit_bc && !user_wants_bitcode {
833 remove(sess, &crate_output.with_extension("metadata.bc"));
837 // We leave the following files around by default:
839 // - crate.metadata.o
841 // These are used in linking steps and will be cleaned up afterward.
843 // FIXME: time_llvm_passes support - does this use a global context or
845 //if sess.time_llvm_passes() { llvm::LLVMRustPrintPassTimings(); }
849 mtrans: ModuleTranslation,
850 config: ModuleConfig,
851 output_names: OutputFilenames,
855 fn build_work_item(sess: &Session,
856 mtrans: ModuleTranslation,
857 config: ModuleConfig,
858 output_names: OutputFilenames,
862 let mut config = config;
863 config.tm = create_target_machine(sess);
864 WorkItem { mtrans: mtrans, config: config, output_names: output_names,
865 name_extra: name_extra }
868 fn execute_work_item(cgcx: &CodegenContext,
869 work_item: WorkItem) {
871 optimize_and_codegen(cgcx, work_item.mtrans, work_item.config,
872 work_item.name_extra, work_item.output_names);
876 fn run_work_singlethreaded(sess: &Session,
877 reachable: &[String],
878 work_items: Vec<WorkItem>) {
879 let cgcx = CodegenContext::new_with_session(sess, reachable);
880 let mut work_items = work_items;
882 // Since we're running single-threaded, we can pass the session to
883 // the proc, allowing `optimize_and_codegen` to perform LTO.
884 for work in Unfold::new((), |_| work_items.pop()) {
885 execute_work_item(&cgcx, work);
889 fn run_work_multithreaded(sess: &Session,
890 work_items: Vec<WorkItem>,
892 // Run some workers to process the work items.
893 let work_items_arc = Arc::new(Mutex::new(work_items));
894 let mut diag_emitter = SharedEmitter::new();
895 let mut futures = Vec::with_capacity(num_workers);
897 for i in range(0, num_workers) {
898 let work_items_arc = work_items_arc.clone();
899 let diag_emitter = diag_emitter.clone();
900 let remark = sess.opts.cg.remark.clone();
902 let (tx, rx) = channel();
903 let mut tx = Some(tx);
906 thread::Builder::new().name(format!("codegen-{}", i)).spawn(move |:| {
907 let diag_handler = mk_handler(box diag_emitter);
909 // Must construct cgcx inside the proc because it has non-Send
911 let cgcx = CodegenContext {
913 handler: &diag_handler,
918 // Avoid holding the lock for the entire duration of the match.
919 let maybe_work = work_items_arc.lock().unwrap().pop();
922 execute_work_item(&cgcx, work);
924 // Make sure to fail the worker so the main thread can
925 // tell that there were errors.
926 cgcx.handler.abort_if_errors();
932 tx.take().unwrap().send(()).unwrap();
936 let mut panicked = false;
937 for rx in futures.into_iter() {
944 // Display any new diagnostics.
945 diag_emitter.dump(sess.diagnostic().handler());
948 sess.fatal("aborting due to worker thread panic");
952 pub fn run_assembler(sess: &Session, outputs: &OutputFilenames) {
953 let pname = get_cc_prog(sess);
954 let mut cmd = Command::new(pname[]);
956 cmd.arg("-c").arg("-o").arg(outputs.path(config::OutputTypeObject))
957 .arg(outputs.temp_path(config::OutputTypeAssembly));
962 if !prog.status.success() {
963 sess.err(format!("linking with `{}` failed: {}",
966 sess.note(format!("{}", &cmd)[]);
967 let mut note = prog.error.clone();
968 note.push_all(prog.output[]);
969 sess.note(str::from_utf8(note[]).unwrap());
970 sess.abort_if_errors();
974 sess.err(format!("could not exec the linker `{}`: {}",
977 sess.abort_if_errors();
982 unsafe fn configure_llvm(sess: &Session) {
983 use std::sync::{Once, ONCE_INIT};
984 static INIT: Once = ONCE_INIT;
986 // Copy what clang does by turning on loop vectorization at O2 and
987 // slp vectorization at O3
988 let vectorize_loop = !sess.opts.cg.no_vectorize_loops &&
989 (sess.opts.optimize == config::Default ||
990 sess.opts.optimize == config::Aggressive);
991 let vectorize_slp = !sess.opts.cg.no_vectorize_slp &&
992 sess.opts.optimize == config::Aggressive;
994 let mut llvm_c_strs = Vec::new();
995 let mut llvm_args = Vec::new();
997 let mut add = |&mut : arg: &str| {
998 let s = arg.to_c_str();
999 llvm_args.push(s.as_ptr());
1000 llvm_c_strs.push(s);
1002 add("rustc"); // fake program name
1003 if vectorize_loop { add("-vectorize-loops"); }
1004 if vectorize_slp { add("-vectorize-slp"); }
1005 if sess.time_llvm_passes() { add("-time-passes"); }
1006 if sess.print_llvm_passes() { add("-debug-pass=Structure"); }
1008 for arg in sess.opts.cg.llvm_args.iter() {
1014 llvm::LLVMInitializePasses();
1016 // Only initialize the platforms supported by Rust here, because
1017 // using --llvm-root will have multiple platforms that rustllvm
1018 // doesn't actually link to and it's pointless to put target info
1019 // into the registry that Rust cannot generate machine code for.
1020 llvm::LLVMInitializeX86TargetInfo();
1021 llvm::LLVMInitializeX86Target();
1022 llvm::LLVMInitializeX86TargetMC();
1023 llvm::LLVMInitializeX86AsmPrinter();
1024 llvm::LLVMInitializeX86AsmParser();
1026 llvm::LLVMInitializeARMTargetInfo();
1027 llvm::LLVMInitializeARMTarget();
1028 llvm::LLVMInitializeARMTargetMC();
1029 llvm::LLVMInitializeARMAsmPrinter();
1030 llvm::LLVMInitializeARMAsmParser();
1032 llvm::LLVMInitializeAArch64TargetInfo();
1033 llvm::LLVMInitializeAArch64Target();
1034 llvm::LLVMInitializeAArch64TargetMC();
1035 llvm::LLVMInitializeAArch64AsmPrinter();
1036 llvm::LLVMInitializeAArch64AsmParser();
1038 llvm::LLVMInitializeMipsTargetInfo();
1039 llvm::LLVMInitializeMipsTarget();
1040 llvm::LLVMInitializeMipsTargetMC();
1041 llvm::LLVMInitializeMipsAsmPrinter();
1042 llvm::LLVMInitializeMipsAsmParser();
1044 llvm::LLVMRustSetLLVMOptions(llvm_args.len() as c_int,
1045 llvm_args.as_ptr());
1049 unsafe fn populate_llvm_passes(fpm: llvm::PassManagerRef,
1050 mpm: llvm::PassManagerRef,
1052 opt: llvm::CodeGenOptLevel,
1053 no_builtins: bool) {
1054 // Create the PassManagerBuilder for LLVM. We configure it with
1055 // reasonable defaults and prepare it to actually populate the pass
1057 let builder = llvm::LLVMPassManagerBuilderCreate();
1059 llvm::CodeGenLevelNone => {
1060 // Don't add lifetime intrinsics at O0
1061 llvm::LLVMRustAddAlwaysInlinePass(builder, false);
1063 llvm::CodeGenLevelLess => {
1064 llvm::LLVMRustAddAlwaysInlinePass(builder, true);
1066 // numeric values copied from clang
1067 llvm::CodeGenLevelDefault => {
1068 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder,
1071 llvm::CodeGenLevelAggressive => {
1072 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder,
1076 llvm::LLVMPassManagerBuilderSetOptLevel(builder, opt as c_uint);
1077 llvm::LLVMRustAddBuilderLibraryInfo(builder, llmod, no_builtins);
1079 // Use the builder to populate the function/module pass managers.
1080 llvm::LLVMPassManagerBuilderPopulateFunctionPassManager(builder, fpm);
1081 llvm::LLVMPassManagerBuilderPopulateModulePassManager(builder, mpm);
1082 llvm::LLVMPassManagerBuilderDispose(builder);
1085 llvm::CodeGenLevelDefault | llvm::CodeGenLevelAggressive => {
1086 "mergefunc".with_c_str(|s| llvm::LLVMRustAddPass(mpm, s));