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_linker, remove};
13 use back::symbol_export::ExportedSymbols;
14 use rustc_incremental::{save_trans_partition, in_incr_comp_dir};
15 use session::config::{OutputFilenames, OutputTypes, Passes, SomePasses, AllPasses};
17 use session::config::{self, OutputType};
19 use llvm::{ModuleRef, TargetMachineRef, PassManagerRef, DiagnosticInfoRef, ContextRef};
20 use llvm::SMDiagnosticRef;
21 use {CrateTranslation, ModuleLlvm, ModuleSource, ModuleTranslation};
22 use util::common::{time, time_depth, set_time_depth};
23 use util::common::path2cstr;
24 use util::fs::link_or_copy;
25 use errors::{self, Handler, Level, DiagnosticBuilder};
26 use errors::emitter::Emitter;
27 use syntax_pos::MultiSpan;
28 use context::{is_pie_binary, get_reloc_model};
30 use std::ffi::CString;
32 use std::path::{Path, PathBuf};
34 use std::sync::{Arc, Mutex};
35 use std::sync::mpsc::channel;
37 use libc::{c_uint, c_void};
39 pub const RELOC_MODEL_ARGS : [(&'static str, llvm::RelocMode); 4] = [
40 ("pic", llvm::RelocMode::PIC),
41 ("static", llvm::RelocMode::Static),
42 ("default", llvm::RelocMode::Default),
43 ("dynamic-no-pic", llvm::RelocMode::DynamicNoPic),
46 pub const CODE_GEN_MODEL_ARGS : [(&'static str, llvm::CodeModel); 5] = [
47 ("default", llvm::CodeModel::Default),
48 ("small", llvm::CodeModel::Small),
49 ("kernel", llvm::CodeModel::Kernel),
50 ("medium", llvm::CodeModel::Medium),
51 ("large", llvm::CodeModel::Large),
54 pub fn llvm_err(handler: &errors::Handler, msg: String) -> ! {
55 match llvm::last_error() {
56 Some(err) => panic!(handler.fatal(&format!("{}: {}", msg, err))),
57 None => panic!(handler.fatal(&msg)),
61 pub fn write_output_file(
62 handler: &errors::Handler,
63 target: llvm::TargetMachineRef,
64 pm: llvm::PassManagerRef,
67 file_type: llvm::FileType) {
69 let output_c = path2cstr(output);
70 let result = llvm::LLVMRustWriteOutputFile(
71 target, pm, m, output_c.as_ptr(), file_type);
72 if result.into_result().is_err() {
73 llvm_err(handler, format!("could not write output to {}", output.display()));
85 // We use an Arc instead of just returning a list of diagnostics from the
86 // child thread because we need to make sure that the messages are seen even
87 // if the child thread panics (for example, when `fatal` is called).
89 struct SharedEmitter {
90 buffer: Arc<Mutex<Vec<Diagnostic>>>,
94 fn new() -> SharedEmitter {
96 buffer: Arc::new(Mutex::new(Vec::new())),
100 fn dump(&mut self, handler: &Handler) {
101 let mut buffer = self.buffer.lock().unwrap();
102 for diag in &*buffer {
105 handler.emit_with_code(&MultiSpan::new(),
111 handler.emit(&MultiSpan::new(),
121 impl Emitter for SharedEmitter {
122 fn emit(&mut self, db: &DiagnosticBuilder) {
123 self.buffer.lock().unwrap().push(Diagnostic {
125 code: db.code.clone(),
128 for child in &db.children {
129 self.buffer.lock().unwrap().push(Diagnostic {
130 msg: child.message(),
138 // On android, we by default compile for armv7 processors. This enables
139 // things like double word CAS instructions (rather than emulating them)
140 // which are *far* more efficient. This is obviously undesirable in some
141 // cases, so if any sort of target feature is specified we don't append v7
142 // to the feature list.
144 // On iOS only armv7 and newer are supported. So it is useful to
145 // get all hardware potential via VFP3 (hardware floating point)
146 // and NEON (SIMD) instructions supported by LLVM.
147 // Note that without those flags various linking errors might
148 // arise as some of intrinsics are converted into function calls
149 // and nobody provides implementations those functions
150 fn target_feature(sess: &Session) -> String {
151 let rustc_features = [
154 let requested_features = sess.opts.cg.target_feature.split(',');
155 let llvm_features = requested_features.filter(|f| {
156 !rustc_features.iter().any(|s| f.contains(s))
159 sess.target.target.options.features,
160 llvm_features.collect::<Vec<_>>().join(","))
163 fn get_llvm_opt_level(optimize: config::OptLevel) -> llvm::CodeGenOptLevel {
165 config::OptLevel::No => llvm::CodeGenOptLevel::None,
166 config::OptLevel::Less => llvm::CodeGenOptLevel::Less,
167 config::OptLevel::Default => llvm::CodeGenOptLevel::Default,
168 config::OptLevel::Aggressive => llvm::CodeGenOptLevel::Aggressive,
169 _ => llvm::CodeGenOptLevel::Default,
173 fn get_llvm_opt_size(optimize: config::OptLevel) -> llvm::CodeGenOptSize {
175 config::OptLevel::Size => llvm::CodeGenOptSizeDefault,
176 config::OptLevel::SizeMin => llvm::CodeGenOptSizeAggressive,
177 _ => llvm::CodeGenOptSizeNone,
181 pub fn create_target_machine(sess: &Session) -> TargetMachineRef {
182 let reloc_model = get_reloc_model(sess);
184 let opt_level = get_llvm_opt_level(sess.opts.optimize);
185 let use_softfp = sess.opts.cg.soft_float;
187 let ffunction_sections = sess.target.target.options.function_sections;
188 let fdata_sections = ffunction_sections;
190 let code_model_arg = match sess.opts.cg.code_model {
191 Some(ref s) => &s[..],
192 None => &sess.target.target.options.code_model[..],
195 let code_model = match CODE_GEN_MODEL_ARGS.iter().find(
196 |&&arg| arg.0 == code_model_arg) {
199 sess.err(&format!("{:?} is not a valid code model",
203 sess.abort_if_errors();
208 let triple = &sess.target.target.llvm_target;
211 let triple = CString::new(triple.as_bytes()).unwrap();
212 let cpu = match sess.opts.cg.target_cpu {
214 None => &*sess.target.target.options.cpu
216 let cpu = CString::new(cpu.as_bytes()).unwrap();
217 let features = CString::new(target_feature(sess).as_bytes()).unwrap();
218 llvm::LLVMRustCreateTargetMachine(
219 triple.as_ptr(), cpu.as_ptr(), features.as_ptr(),
231 llvm_err(sess.diagnostic(),
232 format!("Could not create LLVM TargetMachine for triple: {}",
233 triple).to_string());
240 /// Module-specific configuration for `optimize_and_codegen`.
242 pub struct ModuleConfig {
243 /// LLVM TargetMachine to use for codegen.
244 tm: TargetMachineRef,
245 /// Names of additional optimization passes to run.
247 /// Some(level) to optimize at a certain level, or None to run
248 /// absolutely no optimizations (used for the metadata module).
249 opt_level: Option<llvm::CodeGenOptLevel>,
251 /// Some(level) to optimize binary size, or None to not affect program size.
252 opt_size: Option<llvm::CodeGenOptSize>,
254 // Flags indicating which outputs to produce.
255 emit_no_opt_bc: bool,
261 // Miscellaneous flags. These are mostly copied from command-line
264 no_prepopulate_passes: bool,
267 vectorize_loop: bool,
269 merge_functions: bool,
270 inline_threshold: Option<usize>,
271 // Instead of creating an object file by doing LLVM codegen, just
272 // make the object file bitcode. Provides easy compatibility with
273 // emscripten's ecc compiler, when used as the linker.
274 obj_is_bitcode: bool,
277 unsafe impl Send for ModuleConfig { }
280 fn new(tm: TargetMachineRef, passes: Vec<String>) -> ModuleConfig {
287 emit_no_opt_bc: false,
293 obj_is_bitcode: false,
296 no_prepopulate_passes: false,
299 vectorize_loop: false,
300 vectorize_slp: false,
301 merge_functions: false,
302 inline_threshold: None
306 fn set_flags(&mut self, sess: &Session, trans: &CrateTranslation) {
307 self.no_verify = sess.no_verify();
308 self.no_prepopulate_passes = sess.opts.cg.no_prepopulate_passes;
309 self.no_builtins = trans.no_builtins;
310 self.time_passes = sess.time_passes();
311 self.inline_threshold = sess.opts.cg.inline_threshold;
312 self.obj_is_bitcode = sess.target.target.options.obj_is_bitcode;
314 // Copy what clang does by turning on loop vectorization at O2 and
315 // slp vectorization at O3. Otherwise configure other optimization aspects
316 // of this pass manager builder.
317 self.vectorize_loop = !sess.opts.cg.no_vectorize_loops &&
318 (sess.opts.optimize == config::OptLevel::Default ||
319 sess.opts.optimize == config::OptLevel::Aggressive);
320 self.vectorize_slp = !sess.opts.cg.no_vectorize_slp &&
321 sess.opts.optimize == config::OptLevel::Aggressive;
323 self.merge_functions = sess.opts.optimize == config::OptLevel::Default ||
324 sess.opts.optimize == config::OptLevel::Aggressive;
328 /// Additional resources used by optimize_and_codegen (not module specific)
329 struct CodegenContext<'a> {
330 // Extra resources used for LTO: (sess, reachable). This will be `None`
331 // when running in a worker thread.
332 lto_ctxt: Option<(&'a Session, &'a ExportedSymbols)>,
333 // Handler to use for diagnostics produced during codegen.
334 handler: &'a Handler,
335 // LLVM passes added by plugins.
336 plugin_passes: Vec<String>,
337 // LLVM optimizations for which we want to print remarks.
339 // Worker thread number
341 // The incremental compilation session directory, or None if we are not
342 // compiling incrementally
343 incr_comp_session_dir: Option<PathBuf>
346 impl<'a> CodegenContext<'a> {
347 fn new_with_session(sess: &'a Session,
348 exported_symbols: &'a ExportedSymbols)
349 -> CodegenContext<'a> {
351 lto_ctxt: Some((sess, exported_symbols)),
352 handler: sess.diagnostic(),
353 plugin_passes: sess.plugin_llvm_passes.borrow().clone(),
354 remark: sess.opts.cg.remark.clone(),
356 incr_comp_session_dir: sess.incr_comp_session_dir_opt().map(|r| r.clone())
361 struct HandlerFreeVars<'a> {
363 cgcx: &'a CodegenContext<'a>,
366 unsafe extern "C" fn report_inline_asm<'a, 'b>(cgcx: &'a CodegenContext<'a>,
369 use syntax_pos::ExpnId;
371 match cgcx.lto_ctxt {
373 sess.codemap().with_expn_info(ExpnId::from_u32(cookie), |info| match info {
374 Some(ei) => sess.span_err(ei.call_site, msg),
375 None => sess.err(msg),
380 cgcx.handler.struct_err(msg)
381 .note("build without -C codegen-units for more exact errors")
387 unsafe extern "C" fn inline_asm_handler(diag: SMDiagnosticRef,
390 let HandlerFreeVars { cgcx, .. } = *(user as *const HandlerFreeVars);
392 let msg = llvm::build_string(|s| llvm::LLVMRustWriteSMDiagnosticToString(diag, s))
393 .expect("non-UTF8 SMDiagnostic");
395 report_inline_asm(cgcx, &msg[..], cookie);
398 unsafe extern "C" fn diagnostic_handler(info: DiagnosticInfoRef, user: *mut c_void) {
399 let HandlerFreeVars { llcx, cgcx } = *(user as *const HandlerFreeVars);
401 match llvm::diagnostic::Diagnostic::unpack(info) {
402 llvm::diagnostic::InlineAsm(inline) => {
403 report_inline_asm(cgcx,
404 &llvm::twine_to_string(inline.message),
408 llvm::diagnostic::Optimization(opt) => {
409 let enabled = match cgcx.remark {
411 SomePasses(ref v) => v.iter().any(|s| *s == opt.pass_name),
415 let loc = llvm::debug_loc_to_string(llcx, opt.debug_loc);
416 cgcx.handler.note_without_error(&format!("optimization {} for {} at {}: {}",
419 if loc.is_empty() { "[unknown]" } else { &*loc },
428 // Unsafe due to LLVM calls.
429 unsafe fn optimize_and_codegen(cgcx: &CodegenContext,
430 mtrans: ModuleTranslation,
432 config: ModuleConfig,
433 output_names: OutputFilenames) {
434 let llmod = mllvm.llmod;
435 let llcx = mllvm.llcx;
438 // llcx doesn't outlive this function, so we can put this on the stack.
439 let fv = HandlerFreeVars {
443 let fv = &fv as *const HandlerFreeVars as *mut c_void;
445 llvm::LLVMRustSetInlineAsmDiagnosticHandler(llcx, inline_asm_handler, fv);
446 llvm::LLVMContextSetDiagnosticHandler(llcx, diagnostic_handler, fv);
448 let module_name = Some(&mtrans.name[..]);
450 if config.emit_no_opt_bc {
451 let out = output_names.temp_path_ext("no-opt.bc", module_name);
452 let out = path2cstr(&out);
453 llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr());
456 if config.opt_level.is_some() {
457 // Create the two optimizing pass managers. These mirror what clang
458 // does, and are by populated by LLVM's default PassManagerBuilder.
459 // Each manager has a different set of passes, but they also share
460 // some common passes.
461 let fpm = llvm::LLVMCreateFunctionPassManagerForModule(llmod);
462 let mpm = llvm::LLVMCreatePassManager();
464 // If we're verifying or linting, add them to the function pass
466 let addpass = |pass_name: &str| {
467 let pass_name = CString::new(pass_name).unwrap();
468 let pass = llvm::LLVMRustFindAndCreatePass(pass_name.as_ptr());
472 let pass_manager = match llvm::LLVMRustPassKind(pass) {
473 llvm::PassKind::Function => fpm,
474 llvm::PassKind::Module => mpm,
475 llvm::PassKind::Other => {
476 cgcx.handler.err("Encountered LLVM pass kind we can't handle");
480 llvm::LLVMRustAddPass(pass_manager, pass);
484 if !config.no_verify { assert!(addpass("verify")); }
485 if !config.no_prepopulate_passes {
486 llvm::LLVMRustAddAnalysisPasses(tm, fpm, llmod);
487 llvm::LLVMRustAddAnalysisPasses(tm, mpm, llmod);
488 with_llvm_pmb(llmod, &config, &mut |b| {
489 llvm::LLVMPassManagerBuilderPopulateFunctionPassManager(b, fpm);
490 llvm::LLVMPassManagerBuilderPopulateModulePassManager(b, mpm);
494 for pass in &config.passes {
496 cgcx.handler.warn(&format!("unknown pass `{}`, ignoring",
501 for pass in &cgcx.plugin_passes {
503 cgcx.handler.err(&format!("a plugin asked for LLVM pass \
504 `{}` but LLVM does not \
505 recognize it", pass));
509 cgcx.handler.abort_if_errors();
511 // Finally, run the actual optimization passes
512 time(config.time_passes, &format!("llvm function passes [{}]", cgcx.worker), ||
513 llvm::LLVMRustRunFunctionPassManager(fpm, llmod));
514 time(config.time_passes, &format!("llvm module passes [{}]", cgcx.worker), ||
515 llvm::LLVMRunPassManager(mpm, llmod));
517 // Deallocate managers that we're now done with
518 llvm::LLVMDisposePassManager(fpm);
519 llvm::LLVMDisposePassManager(mpm);
521 match cgcx.lto_ctxt {
522 Some((sess, exported_symbols)) if sess.lto() => {
523 time(sess.time_passes(), "all lto passes", || {
524 let temp_no_opt_bc_filename =
525 output_names.temp_path_ext("no-opt.lto.bc", module_name);
531 &temp_no_opt_bc_filename);
533 if config.emit_lto_bc {
534 let out = output_names.temp_path_ext("lto.bc", module_name);
535 let out = path2cstr(&out);
536 llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr());
543 // A codegen-specific pass manager is used to generate object
544 // files for an LLVM module.
546 // Apparently each of these pass managers is a one-shot kind of
547 // thing, so we create a new one for each type of output. The
548 // pass manager passed to the closure should be ensured to not
549 // escape the closure itself, and the manager should only be
551 unsafe fn with_codegen<F>(tm: TargetMachineRef,
555 F: FnOnce(PassManagerRef),
557 let cpm = llvm::LLVMCreatePassManager();
558 llvm::LLVMRustAddAnalysisPasses(tm, cpm, llmod);
559 llvm::LLVMRustAddLibraryInfo(cpm, llmod, no_builtins);
563 // Change what we write and cleanup based on whether obj files are
564 // just llvm bitcode. In that case write bitcode, and possibly
565 // delete the bitcode if it wasn't requested. Don't generate the
566 // machine code, instead copy the .o file from the .bc
567 let write_bc = config.emit_bc || config.obj_is_bitcode;
568 let rm_bc = !config.emit_bc && config.obj_is_bitcode;
569 let write_obj = config.emit_obj && !config.obj_is_bitcode;
570 let copy_bc_to_obj = config.emit_obj && config.obj_is_bitcode;
572 let bc_out = output_names.temp_path(OutputType::Bitcode, module_name);
573 let obj_out = output_names.temp_path(OutputType::Object, module_name);
576 let bc_out_c = path2cstr(&bc_out);
577 llvm::LLVMWriteBitcodeToFile(llmod, bc_out_c.as_ptr());
580 time(config.time_passes, &format!("codegen passes [{}]", cgcx.worker), || {
582 let out = output_names.temp_path(OutputType::LlvmAssembly, module_name);
583 let out = path2cstr(&out);
584 with_codegen(tm, llmod, config.no_builtins, |cpm| {
585 llvm::LLVMRustPrintModule(cpm, llmod, out.as_ptr());
586 llvm::LLVMDisposePassManager(cpm);
591 let path = output_names.temp_path(OutputType::Assembly, module_name);
593 // We can't use the same module for asm and binary output, because that triggers
594 // various errors like invalid IR or broken binaries, so we might have to clone the
595 // module to produce the asm output
596 let llmod = if config.emit_obj {
597 llvm::LLVMCloneModule(llmod)
601 with_codegen(tm, llmod, config.no_builtins, |cpm| {
602 write_output_file(cgcx.handler, tm, cpm, llmod, &path,
603 llvm::FileType::AssemblyFile);
606 llvm::LLVMDisposeModule(llmod);
611 with_codegen(tm, llmod, config.no_builtins, |cpm| {
612 write_output_file(cgcx.handler, tm, cpm, llmod, &obj_out,
613 llvm::FileType::ObjectFile);
619 debug!("copying bitcode {:?} to obj {:?}", bc_out, obj_out);
620 if let Err(e) = link_or_copy(&bc_out, &obj_out) {
621 cgcx.handler.err(&format!("failed to copy bitcode to object file: {}", e));
626 debug!("removing_bitcode {:?}", bc_out);
627 if let Err(e) = fs::remove_file(&bc_out) {
628 cgcx.handler.err(&format!("failed to remove bitcode: {}", e));
632 llvm::LLVMRustDisposeTargetMachine(tm);
636 pub fn cleanup_llvm(trans: &CrateTranslation) {
637 for module in trans.modules.iter() {
639 match module.source {
640 ModuleSource::Translated(llvm) => {
641 llvm::LLVMDisposeModule(llvm.llmod);
642 llvm::LLVMContextDispose(llvm.llcx);
644 ModuleSource::Preexisting(_) => {
651 pub fn run_passes(sess: &Session,
652 trans: &CrateTranslation,
653 output_types: &OutputTypes,
654 crate_output: &OutputFilenames) {
655 // It's possible that we have `codegen_units > 1` but only one item in
656 // `trans.modules`. We could theoretically proceed and do LTO in that
657 // case, but it would be confusing to have the validity of
658 // `-Z lto -C codegen-units=2` depend on details of the crate being
659 // compiled, so we complain regardless.
660 if sess.lto() && sess.opts.cg.codegen_units > 1 {
661 // This case is impossible to handle because LTO expects to be able
662 // to combine the entire crate and all its dependencies into a
663 // single compilation unit, but each codegen unit is in a separate
664 // LLVM context, so they can't easily be combined.
665 sess.fatal("can't perform LTO when using multiple codegen units");
669 assert!(trans.modules.len() == sess.opts.cg.codegen_units ||
670 sess.opts.debugging_opts.incremental.is_some() ||
671 !sess.opts.output_types.should_trans() ||
672 sess.opts.debugging_opts.no_trans);
674 let tm = create_target_machine(sess);
676 // Figure out what we actually need to build.
678 let mut modules_config = ModuleConfig::new(tm, sess.opts.cg.passes.clone());
679 let mut metadata_config = ModuleConfig::new(tm, vec![]);
681 modules_config.opt_level = Some(get_llvm_opt_level(sess.opts.optimize));
682 modules_config.opt_size = Some(get_llvm_opt_size(sess.opts.optimize));
684 // Save all versions of the bytecode if we're saving our temporaries.
685 if sess.opts.cg.save_temps {
686 modules_config.emit_no_opt_bc = true;
687 modules_config.emit_bc = true;
688 modules_config.emit_lto_bc = true;
689 metadata_config.emit_bc = true;
692 // Emit bitcode files for the crate if we're emitting an rlib.
693 // Whenever an rlib is created, the bitcode is inserted into the
694 // archive in order to allow LTO against it.
695 let needs_crate_bitcode =
696 sess.crate_types.borrow().contains(&config::CrateTypeRlib) &&
697 sess.opts.output_types.contains_key(&OutputType::Exe);
698 let needs_crate_object =
699 sess.opts.output_types.contains_key(&OutputType::Exe);
700 if needs_crate_bitcode {
701 modules_config.emit_bc = true;
704 for output_type in output_types.keys() {
706 OutputType::Bitcode => { modules_config.emit_bc = true; }
707 OutputType::LlvmAssembly => { modules_config.emit_ir = true; }
708 OutputType::Assembly => {
709 modules_config.emit_asm = true;
710 // If we're not using the LLVM assembler, this function
711 // could be invoked specially with output_type_assembly, so
712 // in this case we still want the metadata object file.
713 if !sess.opts.output_types.contains_key(&OutputType::Assembly) {
714 metadata_config.emit_obj = true;
717 OutputType::Object => { modules_config.emit_obj = true; }
718 OutputType::Metadata => { metadata_config.emit_obj = true; }
720 modules_config.emit_obj = true;
721 metadata_config.emit_obj = true;
723 OutputType::DepInfo => {}
727 modules_config.set_flags(sess, trans);
728 metadata_config.set_flags(sess, trans);
731 // Populate a buffer with a list of codegen threads. Items are processed in
732 // LIFO order, just because it's a tiny bit simpler that way. (The order
733 // doesn't actually matter.)
734 let mut work_items = Vec::with_capacity(1 + trans.modules.len());
737 let work = build_work_item(sess,
738 trans.metadata_module.clone(),
739 metadata_config.clone(),
740 crate_output.clone());
741 work_items.push(work);
744 for mtrans in trans.modules.iter() {
745 let work = build_work_item(sess,
747 modules_config.clone(),
748 crate_output.clone());
749 work_items.push(work);
752 if sess.opts.debugging_opts.incremental_info {
753 dump_incremental_data(&trans);
756 // Process the work items, optionally using worker threads.
757 // NOTE: This code is not really adapted to incremental compilation where
758 // the compiler decides the number of codegen units (and will
759 // potentially create hundreds of them).
760 let num_workers = work_items.len() - 1;
761 if num_workers <= 1 {
762 run_work_singlethreaded(sess, &trans.exported_symbols, work_items);
764 run_work_multithreaded(sess, work_items, num_workers);
767 // If in incr. comp. mode, preserve the `.o` files for potential re-use
768 for mtrans in trans.modules.iter() {
769 let mut files = vec![];
771 if modules_config.emit_obj {
772 let path = crate_output.temp_path(OutputType::Object, Some(&mtrans.name));
773 files.push((OutputType::Object, path));
776 if modules_config.emit_bc {
777 let path = crate_output.temp_path(OutputType::Bitcode, Some(&mtrans.name));
778 files.push((OutputType::Bitcode, path));
781 save_trans_partition(sess, &mtrans.name, mtrans.symbol_name_hash, &files);
784 // All codegen is finished.
786 llvm::LLVMRustDisposeTargetMachine(tm);
789 // Produce final compile outputs.
790 let copy_gracefully = |from: &Path, to: &Path| {
791 if let Err(e) = fs::copy(from, to) {
792 sess.err(&format!("could not copy {:?} to {:?}: {}", from, to, e));
796 let copy_if_one_unit = |output_type: OutputType,
797 keep_numbered: bool| {
798 if trans.modules.len() == 1 {
799 // 1) Only one codegen unit. In this case it's no difficulty
800 // to copy `foo.0.x` to `foo.x`.
801 let module_name = Some(&(trans.modules[0].name)[..]);
802 let path = crate_output.temp_path(output_type, module_name);
803 copy_gracefully(&path,
804 &crate_output.path(output_type));
805 if !sess.opts.cg.save_temps && !keep_numbered {
806 // The user just wants `foo.x`, not `foo.#module-name#.x`.
810 let ext = crate_output.temp_path(output_type, None)
817 if crate_output.outputs.contains_key(&output_type) {
818 // 2) Multiple codegen units, with `--emit foo=some_name`. We have
819 // no good solution for this case, so warn the user.
820 sess.warn(&format!("ignoring emit path because multiple .{} files \
821 were produced", ext));
822 } else if crate_output.single_output_file.is_some() {
823 // 3) Multiple codegen units, with `-o some_name`. We have
824 // no good solution for this case, so warn the user.
825 sess.warn(&format!("ignoring -o because multiple .{} files \
826 were produced", ext));
828 // 4) Multiple codegen units, but no explicit name. We
829 // just leave the `foo.0.x` files in place.
830 // (We don't have to do any work in this case.)
835 // Flag to indicate whether the user explicitly requested bitcode.
836 // Otherwise, we produced it only as a temporary output, and will need
838 let mut user_wants_bitcode = false;
839 let mut user_wants_objects = false;
840 for output_type in output_types.keys() {
842 OutputType::Bitcode => {
843 user_wants_bitcode = true;
844 // Copy to .bc, but always keep the .0.bc. There is a later
845 // check to figure out if we should delete .0.bc files, or keep
846 // them for making an rlib.
847 copy_if_one_unit(OutputType::Bitcode, true);
849 OutputType::LlvmAssembly => {
850 copy_if_one_unit(OutputType::LlvmAssembly, false);
852 OutputType::Assembly => {
853 copy_if_one_unit(OutputType::Assembly, false);
855 OutputType::Object => {
856 user_wants_objects = true;
857 copy_if_one_unit(OutputType::Object, true);
859 OutputType::Metadata |
861 OutputType::DepInfo => {}
864 let user_wants_bitcode = user_wants_bitcode;
866 // Clean up unwanted temporary files.
868 // We create the following files by default:
869 // - crate.#module-name#.bc
870 // - crate.#module-name#.o
871 // - crate.metadata.bc
872 // - crate.metadata.o
873 // - crate.o (linked from crate.##.o)
874 // - crate.bc (copied from crate.##.bc)
875 // We may create additional files if requested by the user (through
876 // `-C save-temps` or `--emit=` flags).
878 if !sess.opts.cg.save_temps {
879 // Remove the temporary .#module-name#.o objects. If the user didn't
880 // explicitly request bitcode (with --emit=bc), and the bitcode is not
881 // needed for building an rlib, then we must remove .#module-name#.bc as
884 // Specific rules for keeping .#module-name#.bc:
885 // - If we're building an rlib (`needs_crate_bitcode`), then keep
887 // - If the user requested bitcode (`user_wants_bitcode`), and
888 // codegen_units > 1, then keep it.
889 // - If the user requested bitcode but codegen_units == 1, then we
890 // can toss .#module-name#.bc because we copied it to .bc earlier.
891 // - If we're not building an rlib and the user didn't request
892 // bitcode, then delete .#module-name#.bc.
893 // If you change how this works, also update back::link::link_rlib,
894 // where .#module-name#.bc files are (maybe) deleted after making an
896 let keep_numbered_bitcode = needs_crate_bitcode ||
897 (user_wants_bitcode && sess.opts.cg.codegen_units > 1);
899 let keep_numbered_objects = needs_crate_object ||
900 (user_wants_objects && sess.opts.cg.codegen_units > 1);
902 for module_name in trans.modules.iter().map(|m| Some(&m.name[..])) {
903 if modules_config.emit_obj && !keep_numbered_objects {
904 let path = crate_output.temp_path(OutputType::Object, module_name);
908 if modules_config.emit_bc && !keep_numbered_bitcode {
909 let path = crate_output.temp_path(OutputType::Bitcode, module_name);
914 if metadata_config.emit_bc && !user_wants_bitcode {
915 let path = crate_output.temp_path(OutputType::Bitcode,
916 Some(&trans.metadata_module.name[..]));
921 // We leave the following files around by default:
923 // - crate.metadata.o
925 // These are used in linking steps and will be cleaned up afterward.
927 // FIXME: time_llvm_passes support - does this use a global context or
929 if sess.opts.cg.codegen_units == 1 && sess.time_llvm_passes() {
930 unsafe { llvm::LLVMRustPrintPassTimings(); }
934 fn dump_incremental_data(trans: &CrateTranslation) {
936 for mtrans in trans.modules.iter() {
937 match mtrans.source {
938 ModuleSource::Preexisting(..) => reuse += 1,
939 ModuleSource::Translated(..) => (),
942 println!("incremental: re-using {} out of {} modules", reuse, trans.modules.len());
946 mtrans: ModuleTranslation,
947 config: ModuleConfig,
948 output_names: OutputFilenames
951 fn build_work_item(sess: &Session,
952 mtrans: ModuleTranslation,
953 config: ModuleConfig,
954 output_names: OutputFilenames)
957 let mut config = config;
958 config.tm = create_target_machine(sess);
962 output_names: output_names
966 fn execute_work_item(cgcx: &CodegenContext,
967 work_item: WorkItem) {
969 match work_item.mtrans.source {
970 ModuleSource::Translated(mllvm) => {
971 debug!("llvm-optimizing {:?}", work_item.mtrans.name);
972 optimize_and_codegen(cgcx,
976 work_item.output_names);
978 ModuleSource::Preexisting(wp) => {
979 let incr_comp_session_dir = cgcx.incr_comp_session_dir
982 let name = &work_item.mtrans.name;
983 for (kind, saved_file) in wp.saved_files {
984 let obj_out = work_item.output_names.temp_path(kind, Some(name));
985 let source_file = in_incr_comp_dir(&incr_comp_session_dir,
987 debug!("copying pre-existing module `{}` from {:?} to {}",
988 work_item.mtrans.name,
991 match link_or_copy(&source_file, &obj_out) {
994 cgcx.handler.err(&format!("unable to copy {} to {}: {}",
995 source_file.display(),
1006 fn run_work_singlethreaded(sess: &Session,
1007 exported_symbols: &ExportedSymbols,
1008 work_items: Vec<WorkItem>) {
1009 let cgcx = CodegenContext::new_with_session(sess, exported_symbols);
1011 // Since we're running single-threaded, we can pass the session to
1012 // the proc, allowing `optimize_and_codegen` to perform LTO.
1013 for work in work_items.into_iter().rev() {
1014 execute_work_item(&cgcx, work);
1018 fn run_work_multithreaded(sess: &Session,
1019 work_items: Vec<WorkItem>,
1020 num_workers: usize) {
1021 assert!(num_workers > 0);
1023 // Run some workers to process the work items.
1024 let work_items_arc = Arc::new(Mutex::new(work_items));
1025 let mut diag_emitter = SharedEmitter::new();
1026 let mut futures = Vec::with_capacity(num_workers);
1028 for i in 0..num_workers {
1029 let work_items_arc = work_items_arc.clone();
1030 let diag_emitter = diag_emitter.clone();
1031 let plugin_passes = sess.plugin_llvm_passes.borrow().clone();
1032 let remark = sess.opts.cg.remark.clone();
1034 let (tx, rx) = channel();
1035 let mut tx = Some(tx);
1038 let incr_comp_session_dir = sess.incr_comp_session_dir_opt().map(|r| r.clone());
1040 let depth = time_depth();
1041 thread::Builder::new().name(format!("codegen-{}", i)).spawn(move || {
1042 set_time_depth(depth);
1044 let diag_handler = Handler::with_emitter(true, false, box diag_emitter);
1046 // Must construct cgcx inside the proc because it has non-Send
1048 let cgcx = CodegenContext {
1050 handler: &diag_handler,
1051 plugin_passes: plugin_passes,
1054 incr_comp_session_dir: incr_comp_session_dir
1058 // Avoid holding the lock for the entire duration of the match.
1059 let maybe_work = work_items_arc.lock().unwrap().pop();
1062 execute_work_item(&cgcx, work);
1064 // Make sure to fail the worker so the main thread can
1065 // tell that there were errors.
1066 cgcx.handler.abort_if_errors();
1072 tx.take().unwrap().send(()).unwrap();
1076 let mut panicked = false;
1084 // Display any new diagnostics.
1085 diag_emitter.dump(sess.diagnostic());
1088 sess.fatal("aborting due to worker thread panic");
1092 pub fn run_assembler(sess: &Session, outputs: &OutputFilenames) {
1093 let (pname, mut cmd, _) = get_linker(sess);
1095 for arg in &sess.target.target.options.asm_args {
1099 cmd.arg("-c").arg("-o").arg(&outputs.path(OutputType::Object))
1100 .arg(&outputs.temp_path(OutputType::Assembly, None));
1101 debug!("{:?}", cmd);
1103 match cmd.output() {
1105 if !prog.status.success() {
1106 let mut note = prog.stderr.clone();
1107 note.extend_from_slice(&prog.stdout);
1109 sess.struct_err(&format!("linking with `{}` failed: {}",
1112 .note(&format!("{:?}", &cmd))
1113 .note(str::from_utf8(¬e[..]).unwrap())
1115 sess.abort_if_errors();
1119 sess.err(&format!("could not exec the linker `{}`: {}", pname, e));
1120 sess.abort_if_errors();
1125 pub unsafe fn with_llvm_pmb(llmod: ModuleRef,
1126 config: &ModuleConfig,
1127 f: &mut FnMut(llvm::PassManagerBuilderRef)) {
1128 // Create the PassManagerBuilder for LLVM. We configure it with
1129 // reasonable defaults and prepare it to actually populate the pass
1131 let builder = llvm::LLVMPassManagerBuilderCreate();
1132 let opt_level = config.opt_level.unwrap_or(llvm::CodeGenOptLevel::None);
1133 let opt_size = config.opt_size.unwrap_or(llvm::CodeGenOptSizeNone);
1134 let inline_threshold = config.inline_threshold;
1136 llvm::LLVMRustConfigurePassManagerBuilder(builder, opt_level,
1137 config.merge_functions,
1138 config.vectorize_slp,
1139 config.vectorize_loop);
1140 llvm::LLVMPassManagerBuilderSetSizeLevel(builder, opt_size as u32);
1142 if opt_size != llvm::CodeGenOptSizeNone {
1143 llvm::LLVMPassManagerBuilderSetDisableUnrollLoops(builder, 1);
1146 llvm::LLVMRustAddBuilderLibraryInfo(builder, llmod, config.no_builtins);
1148 // Here we match what clang does (kinda). For O0 we only inline
1149 // always-inline functions (but don't add lifetime intrinsics), at O1 we
1150 // inline with lifetime intrinsics, and O2+ we add an inliner with a
1151 // thresholds copied from clang.
1152 match (opt_level, opt_size, inline_threshold) {
1154 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, t as u32);
1156 (llvm::CodeGenOptLevel::Aggressive, ..) => {
1157 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 275);
1159 (_, llvm::CodeGenOptSizeDefault, _) => {
1160 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 75);
1162 (_, llvm::CodeGenOptSizeAggressive, _) => {
1163 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 25);
1165 (llvm::CodeGenOptLevel::None, ..) => {
1166 llvm::LLVMRustAddAlwaysInlinePass(builder, false);
1168 (llvm::CodeGenOptLevel::Less, ..) => {
1169 llvm::LLVMRustAddAlwaysInlinePass(builder, true);
1171 (llvm::CodeGenOptLevel::Default, ..) => {
1172 llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 225);
1174 (llvm::CodeGenOptLevel::Other, ..) => {
1175 bug!("CodeGenOptLevel::Other selected")
1180 llvm::LLVMPassManagerBuilderDispose(builder);