1 // Copyright 2013 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 llvm::{ContextRef, ModuleRef, ValueRef, BuilderRef};
13 use rustc::dep_graph::{DepNode, DepTrackingMap, DepTrackingMapConfig, WorkProduct};
14 use middle::cstore::LinkMeta;
15 use rustc::hir::def::ExportMap;
16 use rustc::hir::def_id::DefId;
18 use rustc::mir::mir_map::MirMap;
19 use rustc::mir::repr as mir;
22 use common::BuilderRef_res;
25 use glue::DropGlueKind;
27 use monomorphize::Instance;
29 use partitioning::CodegenUnit;
30 use trans_item::TransItem;
31 use type_::{Type, TypeNames};
32 use rustc::ty::subst::Substs;
33 use rustc::ty::{self, Ty, TyCtxt};
34 use session::config::NoDebugInfo;
37 use symbol_map::SymbolMap;
38 use util::sha2::Sha256;
39 use util::nodemap::{NodeSet, DefIdMap, FnvHashMap, FnvHashSet};
41 use std::ffi::{CStr, CString};
42 use std::cell::{Cell, RefCell};
43 use std::marker::PhantomData;
48 use syntax::parse::token::InternedString;
52 pub n_glues_created: Cell<usize>,
53 pub n_null_glues: Cell<usize>,
54 pub n_real_glues: Cell<usize>,
55 pub n_fns: Cell<usize>,
56 pub n_inlines: Cell<usize>,
57 pub n_closures: Cell<usize>,
58 pub n_llvm_insns: Cell<usize>,
59 pub llvm_insns: RefCell<FnvHashMap<String, usize>>,
60 // (ident, llvm-instructions)
61 pub fn_stats: RefCell<Vec<(String, usize)> >,
64 /// The shared portion of a `CrateContext`. There is one `SharedCrateContext`
65 /// per crate. The data here is shared between all compilation units of the
66 /// crate, so it must not contain references to any LLVM data structures
67 /// (aside from metadata-related ones).
68 pub struct SharedCrateContext<'a, 'tcx: 'a> {
69 metadata_llmod: ModuleRef,
70 metadata_llcx: ContextRef,
72 export_map: ExportMap,
75 symbol_hasher: RefCell<Sha256>,
76 tcx: TyCtxt<'a, 'tcx, 'tcx>,
79 mir_map: &'a MirMap<'tcx>,
80 mir_cache: RefCell<DepTrackingMap<MirCache<'tcx>>>,
82 use_dll_storage_attrs: bool,
84 translation_items: RefCell<FnvHashSet<TransItem<'tcx>>>,
85 trait_cache: RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>>,
86 project_cache: RefCell<DepTrackingMap<ProjectionCache<'tcx>>>,
89 /// The local portion of a `CrateContext`. There is one `LocalCrateContext`
90 /// per compilation unit. Each one has its own LLVM `ContextRef` so that
91 /// several compilation units may be optimized in parallel. All other LLVM
92 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
93 pub struct LocalCrateContext<'tcx> {
96 previous_work_product: Option<WorkProduct>,
97 tn: TypeNames, // FIXME: This seems to be largely unused.
98 codegen_unit: CodegenUnit<'tcx>,
99 needs_unwind_cleanup_cache: RefCell<FnvHashMap<Ty<'tcx>, bool>>,
100 fn_pointer_shims: RefCell<FnvHashMap<Ty<'tcx>, ValueRef>>,
101 drop_glues: RefCell<FnvHashMap<DropGlueKind<'tcx>, (ValueRef, FnType)>>,
102 /// Cache instances of monomorphic and polymorphic items
103 instances: RefCell<FnvHashMap<Instance<'tcx>, ValueRef>>,
104 /// Cache generated vtables
105 vtables: RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>>,
106 /// Cache of constant strings,
107 const_cstr_cache: RefCell<FnvHashMap<InternedString, ValueRef>>,
109 /// Reverse-direction for const ptrs cast from globals.
110 /// Key is a ValueRef holding a *T,
111 /// Val is a ValueRef holding a *[T].
113 /// Needed because LLVM loses pointer->pointee association
114 /// when we ptrcast, and we have to ptrcast during translation
115 /// of a [T] const because we form a slice, a (*T,usize) pair, not
116 /// a pointer to an LLVM array type. Similar for trait objects.
117 const_unsized: RefCell<FnvHashMap<ValueRef, ValueRef>>,
119 /// Cache of emitted const globals (value -> global)
120 const_globals: RefCell<FnvHashMap<ValueRef, ValueRef>>,
122 /// Cache of emitted const values
123 const_values: RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>), ValueRef>>,
125 /// Cache of external const values
126 extern_const_values: RefCell<DefIdMap<ValueRef>>,
128 /// Mapping from static definitions to their DefId's.
129 statics: RefCell<FnvHashMap<ValueRef, DefId>>,
131 impl_method_cache: RefCell<FnvHashMap<(DefId, ast::Name), DefId>>,
133 /// Cache of closure wrappers for bare fn's.
134 closure_bare_wrapper_cache: RefCell<FnvHashMap<ValueRef, ValueRef>>,
136 /// List of globals for static variables which need to be passed to the
137 /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete.
138 /// (We have to make sure we don't invalidate any ValueRefs referring
140 statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>,
142 lltypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
143 llsizingtypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
144 type_hashcodes: RefCell<FnvHashMap<Ty<'tcx>, String>>,
146 opaque_vec_type: Type,
147 builder: BuilderRef_res,
149 /// Holds the LLVM values for closure IDs.
150 closure_vals: RefCell<FnvHashMap<Instance<'tcx>, ValueRef>>,
152 dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>,
154 eh_personality: Cell<Option<ValueRef>>,
155 eh_unwind_resume: Cell<Option<ValueRef>>,
156 rust_try_fn: Cell<Option<ValueRef>>,
158 intrinsics: RefCell<FnvHashMap<&'static str, ValueRef>>,
160 /// Number of LLVM instructions translated into this `LocalCrateContext`.
161 /// This is used to perform some basic load-balancing to keep all LLVM
162 /// contexts around the same size.
163 n_llvm_insns: Cell<usize>,
165 /// Depth of the current type-of computation - used to bail out
166 type_of_depth: Cell<usize>,
168 symbol_map: Rc<SymbolMap<'tcx>>,
170 /// A counter that is used for generating local symbol names
171 local_gen_sym_counter: Cell<usize>,
174 // Implement DepTrackingMapConfig for `trait_cache`
175 pub struct TraitSelectionCache<'tcx> {
176 data: PhantomData<&'tcx ()>
179 impl<'tcx> DepTrackingMapConfig for TraitSelectionCache<'tcx> {
180 type Key = ty::PolyTraitRef<'tcx>;
181 type Value = traits::Vtable<'tcx, ()>;
182 fn to_dep_node(key: &ty::PolyTraitRef<'tcx>) -> DepNode<DefId> {
183 key.to_poly_trait_predicate().dep_node()
187 // Cache for mir loaded from metadata
188 struct MirCache<'tcx> {
189 data: PhantomData<&'tcx ()>
192 impl<'tcx> DepTrackingMapConfig for MirCache<'tcx> {
194 type Value = Rc<mir::Mir<'tcx>>;
195 fn to_dep_node(key: &DefId) -> DepNode<DefId> {
202 pub struct ProjectionCache<'gcx> {
203 data: PhantomData<&'gcx ()>
206 impl<'gcx> DepTrackingMapConfig for ProjectionCache<'gcx> {
208 type Value = Ty<'gcx>;
209 fn to_dep_node(key: &Self::Key) -> DepNode<DefId> {
210 // Ideally, we'd just put `key` into the dep-node, but we
211 // can't put full types in there. So just collect up all the
212 // def-ids of structs/enums as well as any traits that we
213 // project out of. It doesn't matter so much what we do here,
214 // except that if we are too coarse, we'll create overly
215 // coarse edges between impls and the trans. For example, if
216 // we just used the def-id of things we are projecting out of,
217 // then the key for `<Foo as SomeTrait>::T` and `<Bar as
218 // SomeTrait>::T` would both share a dep-node
219 // (`TraitSelect(SomeTrait)`), and hence the impls for both
220 // `Foo` and `Bar` would be considered inputs. So a change to
221 // `Bar` would affect things that just normalized `Foo`.
222 // Anyway, this heuristic is not ideal, but better than
224 let def_ids: Vec<DefId> =
226 .filter_map(|t| match t.sty {
227 ty::TyAdt(adt_def, _) => Some(adt_def.did),
228 ty::TyProjection(ref proj) => Some(proj.trait_ref.def_id),
232 DepNode::TraitSelect(def_ids)
236 /// This list owns a number of LocalCrateContexts and binds them to their common
237 /// SharedCrateContext. This type just exists as a convenience, something to
238 /// pass around all LocalCrateContexts with and get an iterator over them.
239 pub struct CrateContextList<'a, 'tcx: 'a> {
240 shared: &'a SharedCrateContext<'a, 'tcx>,
241 local_ccxs: Vec<LocalCrateContext<'tcx>>,
244 impl<'a, 'tcx: 'a> CrateContextList<'a, 'tcx> {
245 pub fn new(shared_ccx: &'a SharedCrateContext<'a, 'tcx>,
246 codegen_units: Vec<CodegenUnit<'tcx>>,
247 previous_work_products: Vec<Option<WorkProduct>>,
248 symbol_map: Rc<SymbolMap<'tcx>>)
249 -> CrateContextList<'a, 'tcx> {
252 local_ccxs: codegen_units.into_iter().zip(previous_work_products).map(|(cgu, wp)| {
253 LocalCrateContext::new(shared_ccx, cgu, wp, symbol_map.clone())
258 /// Iterate over all crate contexts, whether or not they need
259 /// translation. That is, whether or not a `.o` file is available
260 /// for re-use from a previous incr. comp.).
261 pub fn iter_all<'b>(&'b self) -> CrateContextIterator<'b, 'tcx> {
262 CrateContextIterator {
265 local_ccxs: &self.local_ccxs[..],
266 filter_to_previous_work_product_unavail: false,
270 /// Iterator over all CCX that need translation (cannot reuse results from
271 /// previous incr. comp.).
272 pub fn iter_need_trans<'b>(&'b self) -> CrateContextIterator<'b, 'tcx> {
273 CrateContextIterator {
276 local_ccxs: &self.local_ccxs[..],
277 filter_to_previous_work_product_unavail: true,
281 pub fn shared(&self) -> &'a SharedCrateContext<'a, 'tcx> {
286 /// A CrateContext value binds together one LocalCrateContext with the
287 /// SharedCrateContext. It exists as a convenience wrapper, so we don't have to
288 /// pass around (SharedCrateContext, LocalCrateContext) tuples all over trans.
289 pub struct CrateContext<'a, 'tcx: 'a> {
290 shared: &'a SharedCrateContext<'a, 'tcx>,
291 local_ccxs: &'a [LocalCrateContext<'tcx>],
292 /// The index of `local` in `local_ccxs`. This is used in
293 /// `maybe_iter(true)` to identify the original `LocalCrateContext`.
297 pub struct CrateContextIterator<'a, 'tcx: 'a> {
298 shared: &'a SharedCrateContext<'a, 'tcx>,
299 local_ccxs: &'a [LocalCrateContext<'tcx>],
302 /// if true, only return results where `previous_work_product` is none
303 filter_to_previous_work_product_unavail: bool,
306 impl<'a, 'tcx> Iterator for CrateContextIterator<'a,'tcx> {
307 type Item = CrateContext<'a, 'tcx>;
309 fn next(&mut self) -> Option<CrateContext<'a, 'tcx>> {
311 if self.index >= self.local_ccxs.len() {
315 let index = self.index;
318 let ccx = CrateContext {
321 local_ccxs: self.local_ccxs,
325 self.filter_to_previous_work_product_unavail &&
326 ccx.previous_work_product().is_some()
336 /// The iterator produced by `CrateContext::maybe_iter`.
337 pub struct CrateContextMaybeIterator<'a, 'tcx: 'a> {
338 shared: &'a SharedCrateContext<'a, 'tcx>,
339 local_ccxs: &'a [LocalCrateContext<'tcx>],
345 impl<'a, 'tcx> Iterator for CrateContextMaybeIterator<'a, 'tcx> {
346 type Item = (CrateContext<'a, 'tcx>, bool);
348 fn next(&mut self) -> Option<(CrateContext<'a, 'tcx>, bool)> {
349 if self.index >= self.local_ccxs.len() {
353 let index = self.index;
356 self.index = self.local_ccxs.len();
359 let ccx = CrateContext {
362 local_ccxs: self.local_ccxs
364 Some((ccx, index == self.origin))
368 pub fn get_reloc_model(sess: &Session) -> llvm::RelocMode {
369 let reloc_model_arg = match sess.opts.cg.relocation_model {
370 Some(ref s) => &s[..],
371 None => &sess.target.target.options.relocation_model[..],
374 match ::back::write::RELOC_MODEL_ARGS.iter().find(
375 |&&arg| arg.0 == reloc_model_arg) {
378 sess.err(&format!("{:?} is not a valid relocation mode",
382 sess.abort_if_errors();
388 fn is_any_library(sess: &Session) -> bool {
389 sess.crate_types.borrow().iter().any(|ty| {
390 *ty != config::CrateTypeExecutable
394 pub fn is_pie_binary(sess: &Session) -> bool {
395 !is_any_library(sess) && get_reloc_model(sess) == llvm::RelocMode::PIC
398 unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
399 let llcx = llvm::LLVMContextCreate();
400 let mod_name = CString::new(mod_name).unwrap();
401 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
403 // Ensure the data-layout values hardcoded remain the defaults.
404 if sess.target.target.options.is_builtin {
405 let tm = ::back::write::create_target_machine(sess);
406 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
407 llvm::LLVMRustDisposeTargetMachine(tm);
409 let data_layout = llvm::LLVMGetDataLayout(llmod);
410 let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes())
411 .ok().expect("got a non-UTF8 data-layout from LLVM");
413 // Unfortunately LLVM target specs change over time, and right now we
414 // don't have proper support to work with any more than one
415 // `data_layout` than the one that is in the rust-lang/rust repo. If
416 // this compiler is configured against a custom LLVM, we may have a
417 // differing data layout, even though we should update our own to use
420 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
421 // disable this check entirely as we may be configured with something
422 // that has a different target layout.
424 // Unsure if this will actually cause breakage when rustc is configured
428 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
429 let custom_llvm_used = cfg_llvm_root.trim() != "";
431 if !custom_llvm_used && sess.target.target.data_layout != data_layout {
432 bug!("data-layout for builtin `{}` target, `{}`, \
433 differs from LLVM default, `{}`",
434 sess.target.target.llvm_target,
435 sess.target.target.data_layout,
440 let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap();
441 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
443 let llvm_target = sess.target.target.llvm_target.as_bytes();
444 let llvm_target = CString::new(llvm_target).unwrap();
445 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
447 if is_pie_binary(sess) {
448 llvm::LLVMRustSetModulePIELevel(llmod);
454 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
455 pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
456 mir_map: &'b MirMap<'tcx>,
457 export_map: ExportMap,
458 symbol_hasher: Sha256,
461 check_overflow: bool)
462 -> SharedCrateContext<'b, 'tcx> {
463 let (metadata_llcx, metadata_llmod) = unsafe {
464 create_context_and_module(&tcx.sess, "metadata")
467 // An interesting part of Windows which MSVC forces our hand on (and
468 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
469 // attributes in LLVM IR as well as native dependencies (in C these
470 // correspond to `__declspec(dllimport)`).
472 // Whenever a dynamic library is built by MSVC it must have its public
473 // interface specified by functions tagged with `dllexport` or otherwise
474 // they're not available to be linked against. This poses a few problems
475 // for the compiler, some of which are somewhat fundamental, but we use
476 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
477 // attribute to all LLVM functions that are reachable (e.g. they're
478 // already tagged with external linkage). This is suboptimal for a few
481 // * If an object file will never be included in a dynamic library,
482 // there's no need to attach the dllexport attribute. Most object
483 // files in Rust are not destined to become part of a dll as binaries
484 // are statically linked by default.
485 // * If the compiler is emitting both an rlib and a dylib, the same
486 // source object file is currently used but with MSVC this may be less
487 // feasible. The compiler may be able to get around this, but it may
488 // involve some invasive changes to deal with this.
490 // The flipside of this situation is that whenever you link to a dll and
491 // you import a function from it, the import should be tagged with
492 // `dllimport`. At this time, however, the compiler does not emit
493 // `dllimport` for any declarations other than constants (where it is
494 // required), which is again suboptimal for even more reasons!
496 // * Calling a function imported from another dll without using
497 // `dllimport` causes the linker/compiler to have extra overhead (one
498 // `jmp` instruction on x86) when calling the function.
499 // * The same object file may be used in different circumstances, so a
500 // function may be imported from a dll if the object is linked into a
501 // dll, but it may be just linked against if linked into an rlib.
502 // * The compiler has no knowledge about whether native functions should
503 // be tagged dllimport or not.
505 // For now the compiler takes the perf hit (I do not have any numbers to
506 // this effect) by marking very little as `dllimport` and praying the
507 // linker will take care of everything. Fixing this problem will likely
508 // require adding a few attributes to Rust itself (feature gated at the
509 // start) and then strongly recommending static linkage on MSVC!
510 let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc;
513 metadata_llmod: metadata_llmod,
514 metadata_llcx: metadata_llcx,
515 export_map: export_map,
516 reachable: reachable,
517 link_meta: link_meta,
518 symbol_hasher: RefCell::new(symbol_hasher),
521 mir_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
523 n_glues_created: Cell::new(0),
524 n_null_glues: Cell::new(0),
525 n_real_glues: Cell::new(0),
527 n_inlines: Cell::new(0),
528 n_closures: Cell::new(0),
529 n_llvm_insns: Cell::new(0),
530 llvm_insns: RefCell::new(FnvHashMap()),
531 fn_stats: RefCell::new(Vec::new()),
533 check_overflow: check_overflow,
534 use_dll_storage_attrs: use_dll_storage_attrs,
535 translation_items: RefCell::new(FnvHashSet()),
536 trait_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
537 project_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
541 pub fn metadata_llmod(&self) -> ModuleRef {
545 pub fn metadata_llcx(&self) -> ContextRef {
549 pub fn export_map<'a>(&'a self) -> &'a ExportMap {
553 pub fn reachable<'a>(&'a self) -> &'a NodeSet {
557 pub fn trait_cache(&self) -> &RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>> {
561 pub fn project_cache(&self) -> &RefCell<DepTrackingMap<ProjectionCache<'tcx>>> {
565 pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
569 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
573 pub fn sess<'a>(&'a self) -> &'a Session {
577 pub fn stats<'a>(&'a self) -> &'a Stats {
581 pub fn use_dll_storage_attrs(&self) -> bool {
582 self.use_dll_storage_attrs
585 pub fn get_mir(&self, def_id: DefId) -> Option<CachedMir<'b, 'tcx>> {
586 if def_id.is_local() {
587 self.mir_map.map.get(&def_id).map(CachedMir::Ref)
589 if let Some(mir) = self.mir_cache.borrow().get(&def_id).cloned() {
590 return Some(CachedMir::Owned(mir));
593 let mir = self.sess().cstore.maybe_get_item_mir(self.tcx, def_id);
594 let cached = mir.map(Rc::new);
595 if let Some(ref mir) = cached {
596 self.mir_cache.borrow_mut().insert(def_id, mir.clone());
598 cached.map(CachedMir::Owned)
602 pub fn translation_items(&self) -> &RefCell<FnvHashSet<TransItem<'tcx>>> {
603 &self.translation_items
606 /// Given the def-id of some item that has no type parameters, make
607 /// a suitable "empty substs" for it.
608 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
609 Substs::for_item(self.tcx(), item_def_id,
610 |_, _| self.tcx().mk_region(ty::ReErased),
612 bug!("empty_substs_for_def_id: {:?} has type parameters", item_def_id)
616 pub fn symbol_hasher(&self) -> &RefCell<Sha256> {
620 pub fn mir_map(&self) -> &MirMap<'tcx> {
624 pub fn metadata_symbol_name(&self) -> String {
625 format!("rust_metadata_{}_{}",
626 self.link_meta().crate_name,
627 self.link_meta().crate_hash)
631 impl<'tcx> LocalCrateContext<'tcx> {
632 fn new<'a>(shared: &SharedCrateContext<'a, 'tcx>,
633 codegen_unit: CodegenUnit<'tcx>,
634 previous_work_product: Option<WorkProduct>,
635 symbol_map: Rc<SymbolMap<'tcx>>)
636 -> LocalCrateContext<'tcx> {
638 // Append ".rs" to LLVM module identifier.
640 // LLVM code generator emits a ".file filename" directive
641 // for ELF backends. Value of the "filename" is set as the
642 // LLVM module identifier. Due to a LLVM MC bug[1], LLVM
643 // crashes if the module identifier is same as other symbols
644 // such as a function name in the module.
645 // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
646 let llmod_id = format!("{}.rs", codegen_unit.name());
648 let (llcx, llmod) = create_context_and_module(&shared.tcx.sess,
651 let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
652 let dctx = debuginfo::CrateDebugContext::new(llmod);
653 debuginfo::metadata::compile_unit_metadata(shared, &dctx, shared.tcx.sess);
659 let local_ccx = LocalCrateContext {
662 previous_work_product: previous_work_product,
663 codegen_unit: codegen_unit,
664 tn: TypeNames::new(),
665 needs_unwind_cleanup_cache: RefCell::new(FnvHashMap()),
666 fn_pointer_shims: RefCell::new(FnvHashMap()),
667 drop_glues: RefCell::new(FnvHashMap()),
668 instances: RefCell::new(FnvHashMap()),
669 vtables: RefCell::new(FnvHashMap()),
670 const_cstr_cache: RefCell::new(FnvHashMap()),
671 const_unsized: RefCell::new(FnvHashMap()),
672 const_globals: RefCell::new(FnvHashMap()),
673 const_values: RefCell::new(FnvHashMap()),
674 extern_const_values: RefCell::new(DefIdMap()),
675 statics: RefCell::new(FnvHashMap()),
676 impl_method_cache: RefCell::new(FnvHashMap()),
677 closure_bare_wrapper_cache: RefCell::new(FnvHashMap()),
678 statics_to_rauw: RefCell::new(Vec::new()),
679 lltypes: RefCell::new(FnvHashMap()),
680 llsizingtypes: RefCell::new(FnvHashMap()),
681 type_hashcodes: RefCell::new(FnvHashMap()),
682 int_type: Type::from_ref(ptr::null_mut()),
683 opaque_vec_type: Type::from_ref(ptr::null_mut()),
684 builder: BuilderRef_res(llvm::LLVMCreateBuilderInContext(llcx)),
685 closure_vals: RefCell::new(FnvHashMap()),
687 eh_personality: Cell::new(None),
688 eh_unwind_resume: Cell::new(None),
689 rust_try_fn: Cell::new(None),
690 intrinsics: RefCell::new(FnvHashMap()),
691 n_llvm_insns: Cell::new(0),
692 type_of_depth: Cell::new(0),
693 symbol_map: symbol_map,
694 local_gen_sym_counter: Cell::new(0),
697 let (int_type, opaque_vec_type, str_slice_ty, mut local_ccx) = {
698 // Do a little dance to create a dummy CrateContext, so we can
699 // create some things in the LLVM module of this codegen unit
700 let mut local_ccxs = vec![local_ccx];
701 let (int_type, opaque_vec_type, str_slice_ty) = {
702 let dummy_ccx = LocalCrateContext::dummy_ccx(shared,
703 local_ccxs.as_mut_slice());
704 let mut str_slice_ty = Type::named_struct(&dummy_ccx, "str_slice");
705 str_slice_ty.set_struct_body(&[Type::i8p(&dummy_ccx),
706 Type::int(&dummy_ccx)],
708 (Type::int(&dummy_ccx), Type::opaque_vec(&dummy_ccx), str_slice_ty)
710 (int_type, opaque_vec_type, str_slice_ty, local_ccxs.pop().unwrap())
713 local_ccx.int_type = int_type;
714 local_ccx.opaque_vec_type = opaque_vec_type;
715 local_ccx.tn.associate_type("str_slice", &str_slice_ty);
717 if shared.tcx.sess.count_llvm_insns() {
718 base::init_insn_ctxt()
725 /// Create a dummy `CrateContext` from `self` and the provided
726 /// `SharedCrateContext`. This is somewhat dangerous because `self` may
727 /// not be fully initialized.
729 /// This is used in the `LocalCrateContext` constructor to allow calling
730 /// functions that expect a complete `CrateContext`, even before the local
731 /// portion is fully initialized and attached to the `SharedCrateContext`.
732 fn dummy_ccx<'a>(shared: &'a SharedCrateContext<'a, 'tcx>,
733 local_ccxs: &'a [LocalCrateContext<'tcx>])
734 -> CrateContext<'a, 'tcx> {
735 assert!(local_ccxs.len() == 1);
739 local_ccxs: local_ccxs
744 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
745 pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> {
749 pub fn local(&self) -> &'b LocalCrateContext<'tcx> {
750 &self.local_ccxs[self.index]
753 /// Get a (possibly) different `CrateContext` from the same
754 /// `SharedCrateContext`.
755 pub fn rotate(&'b self) -> CrateContext<'b, 'tcx> {
759 .zip(0..self.local_ccxs.len())
760 .min_by_key(|&(local_ccx, _idx)| local_ccx.n_llvm_insns.get())
765 local_ccxs: &self.local_ccxs[..],
769 /// Either iterate over only `self`, or iterate over all `CrateContext`s in
770 /// the `SharedCrateContext`. The iterator produces `(ccx, is_origin)`
771 /// pairs, where `is_origin` is `true` if `ccx` is `self` and `false`
772 /// otherwise. This method is useful for avoiding code duplication in
773 /// cases where it may or may not be necessary to translate code into every
775 pub fn maybe_iter(&self, iter_all: bool) -> CrateContextMaybeIterator<'b, 'tcx> {
776 CrateContextMaybeIterator {
778 index: if iter_all { 0 } else { self.index },
781 local_ccxs: self.local_ccxs,
785 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
789 pub fn sess<'a>(&'a self) -> &'a Session {
790 &self.shared.tcx.sess
793 pub fn builder<'a>(&'a self) -> Builder<'a, 'tcx> {
797 pub fn raw_builder<'a>(&'a self) -> BuilderRef {
798 self.local().builder.b
801 pub fn get_intrinsic(&self, key: &str) -> ValueRef {
802 if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
805 match declare_intrinsic(self, key) {
807 None => bug!("unknown intrinsic '{}'", key)
811 pub fn llmod(&self) -> ModuleRef {
815 pub fn llcx(&self) -> ContextRef {
819 pub fn previous_work_product(&self) -> Option<&WorkProduct> {
820 self.local().previous_work_product.as_ref()
823 pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> {
824 &self.local().codegen_unit
827 pub fn td(&self) -> llvm::TargetDataRef {
828 unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
831 pub fn tn<'a>(&'a self) -> &'a TypeNames {
835 pub fn export_map<'a>(&'a self) -> &'a ExportMap {
836 &self.shared.export_map
839 pub fn reachable<'a>(&'a self) -> &'a NodeSet {
840 &self.shared.reachable
843 pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
844 &self.shared.link_meta
847 pub fn needs_unwind_cleanup_cache(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, bool>> {
848 &self.local().needs_unwind_cleanup_cache
851 pub fn fn_pointer_shims(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, ValueRef>> {
852 &self.local().fn_pointer_shims
855 pub fn drop_glues<'a>(&'a self)
856 -> &'a RefCell<FnvHashMap<DropGlueKind<'tcx>, (ValueRef, FnType)>> {
857 &self.local().drop_glues
860 pub fn local_node_for_inlined_defid<'a>(&'a self, def_id: DefId) -> Option<ast::NodeId> {
861 self.sess().cstore.local_node_for_inlined_defid(def_id)
864 pub fn defid_for_inlined_node<'a>(&'a self, node_id: ast::NodeId) -> Option<DefId> {
865 self.sess().cstore.defid_for_inlined_node(node_id)
868 pub fn instances<'a>(&'a self) -> &'a RefCell<FnvHashMap<Instance<'tcx>, ValueRef>> {
869 &self.local().instances
872 pub fn vtables<'a>(&'a self) -> &'a RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>> {
873 &self.local().vtables
876 pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<InternedString, ValueRef>> {
877 &self.local().const_cstr_cache
880 pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
881 &self.local().const_unsized
884 pub fn const_globals<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
885 &self.local().const_globals
888 pub fn const_values<'a>(&'a self) -> &'a RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>),
890 &self.local().const_values
893 pub fn extern_const_values<'a>(&'a self) -> &'a RefCell<DefIdMap<ValueRef>> {
894 &self.local().extern_const_values
897 pub fn statics<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, DefId>> {
898 &self.local().statics
901 pub fn impl_method_cache<'a>(&'a self)
902 -> &'a RefCell<FnvHashMap<(DefId, ast::Name), DefId>> {
903 &self.local().impl_method_cache
906 pub fn closure_bare_wrapper_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
907 &self.local().closure_bare_wrapper_cache
910 pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> {
911 &self.local().statics_to_rauw
914 pub fn lltypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
915 &self.local().lltypes
918 pub fn llsizingtypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
919 &self.local().llsizingtypes
922 pub fn symbol_hasher<'a>(&'a self) -> &'a RefCell<Sha256> {
923 &self.shared.symbol_hasher
926 pub fn type_hashcodes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, String>> {
927 &self.local().type_hashcodes
930 pub fn stats<'a>(&'a self) -> &'a Stats {
934 pub fn int_type(&self) -> Type {
935 self.local().int_type
938 pub fn opaque_vec_type(&self) -> Type {
939 self.local().opaque_vec_type
942 pub fn closure_vals<'a>(&'a self) -> &'a RefCell<FnvHashMap<Instance<'tcx>, ValueRef>> {
943 &self.local().closure_vals
946 pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
950 pub fn eh_personality<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
951 &self.local().eh_personality
954 pub fn eh_unwind_resume<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
955 &self.local().eh_unwind_resume
958 pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
959 &self.local().rust_try_fn
962 fn intrinsics<'a>(&'a self) -> &'a RefCell<FnvHashMap<&'static str, ValueRef>> {
963 &self.local().intrinsics
966 pub fn count_llvm_insn(&self) {
967 self.local().n_llvm_insns.set(self.local().n_llvm_insns.get() + 1);
970 pub fn obj_size_bound(&self) -> u64 {
971 self.tcx().data_layout.obj_size_bound()
974 pub fn report_overbig_object(&self, obj: Ty<'tcx>) -> ! {
976 &format!("the type `{:?}` is too big for the current architecture",
980 pub fn enter_type_of(&self, ty: Ty<'tcx>) -> TypeOfDepthLock<'b, 'tcx> {
981 let current_depth = self.local().type_of_depth.get();
982 debug!("enter_type_of({:?}) at depth {:?}", ty, current_depth);
983 if current_depth > self.sess().recursion_limit.get() {
985 &format!("overflow representing the type `{}`", ty))
987 self.local().type_of_depth.set(current_depth + 1);
988 TypeOfDepthLock(self.local())
991 pub fn layout_of(&self, ty: Ty<'tcx>) -> &'tcx ty::layout::Layout {
992 self.tcx().infer_ctxt(None, None, traits::Reveal::All).enter(|infcx| {
993 ty.layout(&infcx).unwrap_or_else(|e| {
995 ty::layout::LayoutError::SizeOverflow(_) =>
996 self.sess().fatal(&e.to_string()),
997 _ => bug!("failed to get layout for `{}`: {}", ty, e)
1003 pub fn check_overflow(&self) -> bool {
1004 self.shared.check_overflow
1007 pub fn use_dll_storage_attrs(&self) -> bool {
1008 self.shared.use_dll_storage_attrs()
1011 pub fn get_mir(&self, def_id: DefId) -> Option<CachedMir<'b, 'tcx>> {
1012 self.shared.get_mir(def_id)
1015 pub fn symbol_map(&self) -> &SymbolMap<'tcx> {
1016 &*self.local().symbol_map
1019 pub fn translation_items(&self) -> &RefCell<FnvHashSet<TransItem<'tcx>>> {
1020 &self.shared.translation_items
1023 /// Given the def-id of some item that has no type parameters, make
1024 /// a suitable "empty substs" for it.
1025 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
1026 self.shared().empty_substs_for_def_id(item_def_id)
1029 /// Generate a new symbol name with the given prefix. This symbol name must
1030 /// only be used for definitions with `internal` or `private` linkage.
1031 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
1032 let idx = self.local().local_gen_sym_counter.get();
1033 self.local().local_gen_sym_counter.set(idx + 1);
1034 // Include a '.' character, so there can be no accidental conflicts with
1035 // user defined names
1036 format!("{}.{}", prefix, idx)
1040 pub struct TypeOfDepthLock<'a, 'tcx: 'a>(&'a LocalCrateContext<'tcx>);
1042 impl<'a, 'tcx> Drop for TypeOfDepthLock<'a, 'tcx> {
1043 fn drop(&mut self) {
1044 self.0.type_of_depth.set(self.0.type_of_depth.get() - 1);
1048 /// Declare any llvm intrinsics that you might need
1049 fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> {
1051 ($name:expr, fn() -> $ret:expr) => (
1053 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret));
1054 llvm::SetUnnamedAddr(f, false);
1055 ccx.intrinsics().borrow_mut().insert($name, f.clone());
1059 ($name:expr, fn(...) -> $ret:expr) => (
1061 let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret));
1062 llvm::SetUnnamedAddr(f, false);
1063 ccx.intrinsics().borrow_mut().insert($name, f.clone());
1067 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
1069 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret));
1070 llvm::SetUnnamedAddr(f, false);
1071 ccx.intrinsics().borrow_mut().insert($name, f.clone());
1076 macro_rules! mk_struct {
1077 ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
1080 let i8p = Type::i8p(ccx);
1081 let void = Type::void(ccx);
1082 let i1 = Type::i1(ccx);
1083 let t_i8 = Type::i8(ccx);
1084 let t_i16 = Type::i16(ccx);
1085 let t_i32 = Type::i32(ccx);
1086 let t_i64 = Type::i64(ccx);
1087 let t_f32 = Type::f32(ccx);
1088 let t_f64 = Type::f64(ccx);
1090 ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
1091 ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
1092 ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
1093 ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
1094 ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
1095 ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
1096 ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
1097 ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
1098 ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
1100 ifn!("llvm.trap", fn() -> void);
1101 ifn!("llvm.debugtrap", fn() -> void);
1102 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
1104 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
1105 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
1106 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
1107 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
1109 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
1110 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
1111 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
1112 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
1113 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
1114 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
1115 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
1116 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
1117 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
1118 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
1119 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
1120 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
1121 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
1122 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
1123 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
1124 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
1126 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
1127 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
1129 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
1130 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
1132 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
1133 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
1134 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
1135 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
1136 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
1137 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
1139 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
1140 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
1141 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
1142 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
1144 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
1145 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
1146 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
1147 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
1149 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
1150 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
1151 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
1152 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
1154 ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
1155 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
1156 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
1157 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
1159 ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
1160 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
1161 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
1162 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
1164 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
1165 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
1166 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
1168 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1169 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1170 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1171 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1173 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1174 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1175 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1176 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1178 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1179 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1180 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1181 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1183 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1184 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1185 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1186 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1188 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1189 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1190 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1191 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1193 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1194 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1195 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1196 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1198 ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
1199 ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
1201 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
1202 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
1203 ifn!("llvm.localescape", fn(...) -> void);
1204 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
1205 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
1207 ifn!("llvm.assume", fn(i1) -> void);
1209 if ccx.sess().opts.debuginfo != NoDebugInfo {
1210 ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
1211 ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);