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;
23 use common::BuilderRef_res;
26 use glue::DropGlueKind;
28 use monomorphize::Instance;
30 use partitioning::CodegenUnit;
31 use trans_item::TransItem;
32 use type_::{Type, TypeNames};
33 use rustc::ty::subst::Substs;
34 use rustc::ty::{self, Ty, TyCtxt};
35 use session::config::NoDebugInfo;
38 use symbol_map::SymbolMap;
39 use util::sha2::Sha256;
40 use util::nodemap::{NodeSet, DefIdMap, FnvHashMap, FnvHashSet};
42 use std::ffi::{CStr, CString};
43 use std::cell::{Cell, RefCell};
44 use std::marker::PhantomData;
49 use syntax::parse::token::InternedString;
53 pub n_glues_created: Cell<usize>,
54 pub n_null_glues: Cell<usize>,
55 pub n_real_glues: Cell<usize>,
56 pub n_fns: Cell<usize>,
57 pub n_inlines: Cell<usize>,
58 pub n_closures: Cell<usize>,
59 pub n_llvm_insns: Cell<usize>,
60 pub llvm_insns: RefCell<FnvHashMap<String, usize>>,
61 // (ident, llvm-instructions)
62 pub fn_stats: RefCell<Vec<(String, usize)> >,
65 /// The shared portion of a `CrateContext`. There is one `SharedCrateContext`
66 /// per crate. The data here is shared between all compilation units of the
67 /// crate, so it must not contain references to any LLVM data structures
68 /// (aside from metadata-related ones).
69 pub struct SharedCrateContext<'a, 'tcx: 'a> {
70 metadata_llmod: ModuleRef,
71 metadata_llcx: ContextRef,
73 export_map: ExportMap,
76 symbol_hasher: RefCell<Sha256>,
77 tcx: TyCtxt<'a, 'tcx, 'tcx>,
80 mir_map: &'a MirMap<'tcx>,
81 mir_cache: RefCell<DepTrackingMap<MirCache<'tcx>>>,
83 use_dll_storage_attrs: bool,
85 translation_items: RefCell<FnvHashSet<TransItem<'tcx>>>,
86 trait_cache: RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>>,
87 project_cache: RefCell<DepTrackingMap<ProjectionCache<'tcx>>>,
90 /// The local portion of a `CrateContext`. There is one `LocalCrateContext`
91 /// per compilation unit. Each one has its own LLVM `ContextRef` so that
92 /// several compilation units may be optimized in parallel. All other LLVM
93 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
94 pub struct LocalCrateContext<'tcx> {
97 previous_work_product: Option<WorkProduct>,
98 tn: TypeNames, // FIXME: This seems to be largely unused.
99 codegen_unit: CodegenUnit<'tcx>,
100 needs_unwind_cleanup_cache: RefCell<FnvHashMap<Ty<'tcx>, bool>>,
101 fn_pointer_shims: RefCell<FnvHashMap<Ty<'tcx>, ValueRef>>,
102 drop_glues: RefCell<FnvHashMap<DropGlueKind<'tcx>, (ValueRef, FnType)>>,
103 /// Cache instances of monomorphic and polymorphic items
104 instances: RefCell<FnvHashMap<Instance<'tcx>, ValueRef>>,
105 /// Cache generated vtables
106 vtables: RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>>,
107 /// Cache of constant strings,
108 const_cstr_cache: RefCell<FnvHashMap<InternedString, ValueRef>>,
110 /// Reverse-direction for const ptrs cast from globals.
111 /// Key is a ValueRef holding a *T,
112 /// Val is a ValueRef holding a *[T].
114 /// Needed because LLVM loses pointer->pointee association
115 /// when we ptrcast, and we have to ptrcast during translation
116 /// of a [T] const because we form a slice, a (*T,usize) pair, not
117 /// a pointer to an LLVM array type. Similar for trait objects.
118 const_unsized: RefCell<FnvHashMap<ValueRef, ValueRef>>,
120 /// Cache of emitted const globals (value -> global)
121 const_globals: RefCell<FnvHashMap<ValueRef, ValueRef>>,
123 /// Cache of emitted const values
124 const_values: RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>), ValueRef>>,
126 /// Cache of external const values
127 extern_const_values: RefCell<DefIdMap<ValueRef>>,
129 /// Mapping from static definitions to their DefId's.
130 statics: RefCell<FnvHashMap<ValueRef, DefId>>,
132 impl_method_cache: RefCell<FnvHashMap<(DefId, ast::Name), DefId>>,
134 /// Cache of closure wrappers for bare fn's.
135 closure_bare_wrapper_cache: RefCell<FnvHashMap<ValueRef, ValueRef>>,
137 /// List of globals for static variables which need to be passed to the
138 /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete.
139 /// (We have to make sure we don't invalidate any ValueRefs referring
141 statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>,
143 lltypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
144 llsizingtypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
145 adt_reprs: RefCell<FnvHashMap<Ty<'tcx>, Rc<adt::Repr<'tcx>>>>,
146 type_hashcodes: RefCell<FnvHashMap<Ty<'tcx>, String>>,
148 opaque_vec_type: Type,
149 builder: BuilderRef_res,
151 /// Holds the LLVM values for closure IDs.
152 closure_vals: RefCell<FnvHashMap<Instance<'tcx>, ValueRef>>,
154 dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>,
156 eh_personality: Cell<Option<ValueRef>>,
157 eh_unwind_resume: Cell<Option<ValueRef>>,
158 rust_try_fn: Cell<Option<ValueRef>>,
160 intrinsics: RefCell<FnvHashMap<&'static str, ValueRef>>,
162 /// Number of LLVM instructions translated into this `LocalCrateContext`.
163 /// This is used to perform some basic load-balancing to keep all LLVM
164 /// contexts around the same size.
165 n_llvm_insns: Cell<usize>,
167 /// Depth of the current type-of computation - used to bail out
168 type_of_depth: Cell<usize>,
170 symbol_map: Rc<SymbolMap<'tcx>>,
173 // Implement DepTrackingMapConfig for `trait_cache`
174 pub struct TraitSelectionCache<'tcx> {
175 data: PhantomData<&'tcx ()>
178 impl<'tcx> DepTrackingMapConfig for TraitSelectionCache<'tcx> {
179 type Key = ty::PolyTraitRef<'tcx>;
180 type Value = traits::Vtable<'tcx, ()>;
181 fn to_dep_node(key: &ty::PolyTraitRef<'tcx>) -> DepNode<DefId> {
182 key.to_poly_trait_predicate().dep_node()
186 // Cache for mir loaded from metadata
187 struct MirCache<'tcx> {
188 data: PhantomData<&'tcx ()>
191 impl<'tcx> DepTrackingMapConfig for MirCache<'tcx> {
193 type Value = Rc<mir::Mir<'tcx>>;
194 fn to_dep_node(key: &DefId) -> DepNode<DefId> {
201 pub struct ProjectionCache<'gcx> {
202 data: PhantomData<&'gcx ()>
205 impl<'gcx> DepTrackingMapConfig for ProjectionCache<'gcx> {
207 type Value = Ty<'gcx>;
208 fn to_dep_node(key: &Self::Key) -> DepNode<DefId> {
209 // Ideally, we'd just put `key` into the dep-node, but we
210 // can't put full types in there. So just collect up all the
211 // def-ids of structs/enums as well as any traits that we
212 // project out of. It doesn't matter so much what we do here,
213 // except that if we are too coarse, we'll create overly
214 // coarse edges between impls and the trans. For example, if
215 // we just used the def-id of things we are projecting out of,
216 // then the key for `<Foo as SomeTrait>::T` and `<Bar as
217 // SomeTrait>::T` would both share a dep-node
218 // (`TraitSelect(SomeTrait)`), and hence the impls for both
219 // `Foo` and `Bar` would be considered inputs. So a change to
220 // `Bar` would affect things that just normalized `Foo`.
221 // Anyway, this heuristic is not ideal, but better than
223 let def_ids: Vec<DefId> =
225 .filter_map(|t| match t.sty {
226 ty::TyStruct(adt_def, _) |
227 ty::TyEnum(adt_def, _) =>
229 ty::TyProjection(ref proj) =>
230 Some(proj.trait_ref.def_id),
235 DepNode::TraitSelect(def_ids)
239 /// This list owns a number of LocalCrateContexts and binds them to their common
240 /// SharedCrateContext. This type just exists as a convenience, something to
241 /// pass around all LocalCrateContexts with and get an iterator over them.
242 pub struct CrateContextList<'a, 'tcx: 'a> {
243 shared: &'a SharedCrateContext<'a, 'tcx>,
244 local_ccxs: Vec<LocalCrateContext<'tcx>>,
247 impl<'a, 'tcx: 'a> CrateContextList<'a, 'tcx> {
248 pub fn new(shared_ccx: &'a SharedCrateContext<'a, 'tcx>,
249 codegen_units: Vec<CodegenUnit<'tcx>>,
250 previous_work_products: Vec<Option<WorkProduct>>,
251 symbol_map: Rc<SymbolMap<'tcx>>)
252 -> CrateContextList<'a, 'tcx> {
255 local_ccxs: codegen_units.into_iter().zip(previous_work_products).map(|(cgu, wp)| {
256 LocalCrateContext::new(shared_ccx, cgu, wp, symbol_map.clone())
261 /// Iterate over all crate contexts, whether or not they need
262 /// translation. That is, whether or not a `.o` file is available
263 /// for re-use from a previous incr. comp.).
264 pub fn iter_all<'b>(&'b self) -> CrateContextIterator<'b, 'tcx> {
265 CrateContextIterator {
268 local_ccxs: &self.local_ccxs[..],
269 filter_to_previous_work_product_unavail: false,
273 /// Iterator over all CCX that need translation (cannot reuse results from
274 /// previous incr. comp.).
275 pub fn iter_need_trans<'b>(&'b self) -> CrateContextIterator<'b, 'tcx> {
276 CrateContextIterator {
279 local_ccxs: &self.local_ccxs[..],
280 filter_to_previous_work_product_unavail: true,
284 pub fn shared(&self) -> &'a SharedCrateContext<'a, 'tcx> {
289 /// A CrateContext value binds together one LocalCrateContext with the
290 /// SharedCrateContext. It exists as a convenience wrapper, so we don't have to
291 /// pass around (SharedCrateContext, LocalCrateContext) tuples all over trans.
292 pub struct CrateContext<'a, 'tcx: 'a> {
293 shared: &'a SharedCrateContext<'a, 'tcx>,
294 local_ccxs: &'a [LocalCrateContext<'tcx>],
295 /// The index of `local` in `local_ccxs`. This is used in
296 /// `maybe_iter(true)` to identify the original `LocalCrateContext`.
300 pub struct CrateContextIterator<'a, 'tcx: 'a> {
301 shared: &'a SharedCrateContext<'a, 'tcx>,
302 local_ccxs: &'a [LocalCrateContext<'tcx>],
305 /// if true, only return results where `previous_work_product` is none
306 filter_to_previous_work_product_unavail: bool,
309 impl<'a, 'tcx> Iterator for CrateContextIterator<'a,'tcx> {
310 type Item = CrateContext<'a, 'tcx>;
312 fn next(&mut self) -> Option<CrateContext<'a, 'tcx>> {
314 if self.index >= self.local_ccxs.len() {
318 let index = self.index;
321 let ccx = CrateContext {
324 local_ccxs: self.local_ccxs,
328 self.filter_to_previous_work_product_unavail &&
329 ccx.previous_work_product().is_some()
339 /// The iterator produced by `CrateContext::maybe_iter`.
340 pub struct CrateContextMaybeIterator<'a, 'tcx: 'a> {
341 shared: &'a SharedCrateContext<'a, 'tcx>,
342 local_ccxs: &'a [LocalCrateContext<'tcx>],
348 impl<'a, 'tcx> Iterator for CrateContextMaybeIterator<'a, 'tcx> {
349 type Item = (CrateContext<'a, 'tcx>, bool);
351 fn next(&mut self) -> Option<(CrateContext<'a, 'tcx>, bool)> {
352 if self.index >= self.local_ccxs.len() {
356 let index = self.index;
359 self.index = self.local_ccxs.len();
362 let ccx = CrateContext {
365 local_ccxs: self.local_ccxs
367 Some((ccx, index == self.origin))
371 pub fn get_reloc_model(sess: &Session) -> llvm::RelocMode {
372 let reloc_model_arg = match sess.opts.cg.relocation_model {
373 Some(ref s) => &s[..],
374 None => &sess.target.target.options.relocation_model[..],
377 match ::back::write::RELOC_MODEL_ARGS.iter().find(
378 |&&arg| arg.0 == reloc_model_arg) {
381 sess.err(&format!("{:?} is not a valid relocation mode",
385 sess.abort_if_errors();
391 fn is_any_library(sess: &Session) -> bool {
392 sess.crate_types.borrow().iter().any(|ty| {
393 *ty != config::CrateTypeExecutable
397 pub fn is_pie_binary(sess: &Session) -> bool {
398 !is_any_library(sess) && get_reloc_model(sess) == llvm::RelocMode::PIC
401 unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
402 let llcx = llvm::LLVMContextCreate();
403 let mod_name = CString::new(mod_name).unwrap();
404 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
406 // Ensure the data-layout values hardcoded remain the defaults.
407 if sess.target.target.options.is_builtin {
408 let tm = ::back::write::create_target_machine(sess);
409 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
410 llvm::LLVMRustDisposeTargetMachine(tm);
412 let data_layout = llvm::LLVMGetDataLayout(llmod);
413 let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes())
414 .ok().expect("got a non-UTF8 data-layout from LLVM");
416 // Unfortunately LLVM target specs change over time, and right now we
417 // don't have proper support to work with any more than one
418 // `data_layout` than the one that is in the rust-lang/rust repo. If
419 // this compiler is configured against a custom LLVM, we may have a
420 // differing data layout, even though we should update our own to use
423 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
424 // disable this check entirely as we may be configured with something
425 // that has a different target layout.
427 // Unsure if this will actually cause breakage when rustc is configured
431 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
432 let custom_llvm_used = cfg_llvm_root.trim() != "";
434 if !custom_llvm_used && sess.target.target.data_layout != data_layout {
435 bug!("data-layout for builtin `{}` target, `{}`, \
436 differs from LLVM default, `{}`",
437 sess.target.target.llvm_target,
438 sess.target.target.data_layout,
443 let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap();
444 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
446 let llvm_target = sess.target.target.llvm_target.as_bytes();
447 let llvm_target = CString::new(llvm_target).unwrap();
448 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
450 if is_pie_binary(sess) {
451 llvm::LLVMRustSetModulePIELevel(llmod);
457 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
458 pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
459 mir_map: &'b MirMap<'tcx>,
460 export_map: ExportMap,
461 symbol_hasher: Sha256,
464 check_overflow: bool)
465 -> SharedCrateContext<'b, 'tcx> {
466 let (metadata_llcx, metadata_llmod) = unsafe {
467 create_context_and_module(&tcx.sess, "metadata")
470 // An interesting part of Windows which MSVC forces our hand on (and
471 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
472 // attributes in LLVM IR as well as native dependencies (in C these
473 // correspond to `__declspec(dllimport)`).
475 // Whenever a dynamic library is built by MSVC it must have its public
476 // interface specified by functions tagged with `dllexport` or otherwise
477 // they're not available to be linked against. This poses a few problems
478 // for the compiler, some of which are somewhat fundamental, but we use
479 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
480 // attribute to all LLVM functions that are reachable (e.g. they're
481 // already tagged with external linkage). This is suboptimal for a few
484 // * If an object file will never be included in a dynamic library,
485 // there's no need to attach the dllexport attribute. Most object
486 // files in Rust are not destined to become part of a dll as binaries
487 // are statically linked by default.
488 // * If the compiler is emitting both an rlib and a dylib, the same
489 // source object file is currently used but with MSVC this may be less
490 // feasible. The compiler may be able to get around this, but it may
491 // involve some invasive changes to deal with this.
493 // The flipside of this situation is that whenever you link to a dll and
494 // you import a function from it, the import should be tagged with
495 // `dllimport`. At this time, however, the compiler does not emit
496 // `dllimport` for any declarations other than constants (where it is
497 // required), which is again suboptimal for even more reasons!
499 // * Calling a function imported from another dll without using
500 // `dllimport` causes the linker/compiler to have extra overhead (one
501 // `jmp` instruction on x86) when calling the function.
502 // * The same object file may be used in different circumstances, so a
503 // function may be imported from a dll if the object is linked into a
504 // dll, but it may be just linked against if linked into an rlib.
505 // * The compiler has no knowledge about whether native functions should
506 // be tagged dllimport or not.
508 // For now the compiler takes the perf hit (I do not have any numbers to
509 // this effect) by marking very little as `dllimport` and praying the
510 // linker will take care of everything. Fixing this problem will likely
511 // require adding a few attributes to Rust itself (feature gated at the
512 // start) and then strongly recommending static linkage on MSVC!
513 let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc;
516 metadata_llmod: metadata_llmod,
517 metadata_llcx: metadata_llcx,
518 export_map: export_map,
519 reachable: reachable,
520 link_meta: link_meta,
521 symbol_hasher: RefCell::new(symbol_hasher),
524 mir_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
526 n_glues_created: Cell::new(0),
527 n_null_glues: Cell::new(0),
528 n_real_glues: Cell::new(0),
530 n_inlines: Cell::new(0),
531 n_closures: Cell::new(0),
532 n_llvm_insns: Cell::new(0),
533 llvm_insns: RefCell::new(FnvHashMap()),
534 fn_stats: RefCell::new(Vec::new()),
536 check_overflow: check_overflow,
537 use_dll_storage_attrs: use_dll_storage_attrs,
538 translation_items: RefCell::new(FnvHashSet()),
539 trait_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
540 project_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
544 pub fn metadata_llmod(&self) -> ModuleRef {
548 pub fn metadata_llcx(&self) -> ContextRef {
552 pub fn export_map<'a>(&'a self) -> &'a ExportMap {
556 pub fn reachable<'a>(&'a self) -> &'a NodeSet {
560 pub fn trait_cache(&self) -> &RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>> {
564 pub fn project_cache(&self) -> &RefCell<DepTrackingMap<ProjectionCache<'tcx>>> {
568 pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
572 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
576 pub fn sess<'a>(&'a self) -> &'a Session {
580 pub fn stats<'a>(&'a self) -> &'a Stats {
584 pub fn use_dll_storage_attrs(&self) -> bool {
585 self.use_dll_storage_attrs
588 pub fn get_mir(&self, def_id: DefId) -> Option<CachedMir<'b, 'tcx>> {
589 if def_id.is_local() {
590 self.mir_map.map.get(&def_id).map(CachedMir::Ref)
592 if let Some(mir) = self.mir_cache.borrow().get(&def_id).cloned() {
593 return Some(CachedMir::Owned(mir));
596 let mir = self.sess().cstore.maybe_get_item_mir(self.tcx, def_id);
597 let cached = mir.map(Rc::new);
598 if let Some(ref mir) = cached {
599 self.mir_cache.borrow_mut().insert(def_id, mir.clone());
601 cached.map(CachedMir::Owned)
605 pub fn translation_items(&self) -> &RefCell<FnvHashSet<TransItem<'tcx>>> {
606 &self.translation_items
609 /// Given the def-id of some item that has no type parameters, make
610 /// a suitable "empty substs" for it.
611 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
612 Substs::for_item(self.tcx(), item_def_id,
613 |_, _| self.tcx().mk_region(ty::ReErased),
615 bug!("empty_substs_for_def_id: {:?} has type parameters", item_def_id)
619 pub fn symbol_hasher(&self) -> &RefCell<Sha256> {
623 pub fn mir_map(&self) -> &MirMap<'tcx> {
627 pub fn metadata_symbol_name(&self) -> String {
628 format!("rust_metadata_{}_{}",
629 self.link_meta().crate_name,
630 self.link_meta().crate_hash)
634 impl<'tcx> LocalCrateContext<'tcx> {
635 fn new<'a>(shared: &SharedCrateContext<'a, 'tcx>,
636 codegen_unit: CodegenUnit<'tcx>,
637 previous_work_product: Option<WorkProduct>,
638 symbol_map: Rc<SymbolMap<'tcx>>)
639 -> LocalCrateContext<'tcx> {
641 // Append ".rs" to LLVM module identifier.
643 // LLVM code generator emits a ".file filename" directive
644 // for ELF backends. Value of the "filename" is set as the
645 // LLVM module identifier. Due to a LLVM MC bug[1], LLVM
646 // crashes if the module identifier is same as other symbols
647 // such as a function name in the module.
648 // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
649 let llmod_id = format!("{}.rs", codegen_unit.name());
651 let (llcx, llmod) = create_context_and_module(&shared.tcx.sess,
654 let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
655 let dctx = debuginfo::CrateDebugContext::new(llmod);
656 debuginfo::metadata::compile_unit_metadata(shared, &dctx, shared.tcx.sess);
662 let local_ccx = LocalCrateContext {
665 previous_work_product: previous_work_product,
666 codegen_unit: codegen_unit,
667 tn: TypeNames::new(),
668 needs_unwind_cleanup_cache: RefCell::new(FnvHashMap()),
669 fn_pointer_shims: RefCell::new(FnvHashMap()),
670 drop_glues: RefCell::new(FnvHashMap()),
671 instances: RefCell::new(FnvHashMap()),
672 vtables: RefCell::new(FnvHashMap()),
673 const_cstr_cache: RefCell::new(FnvHashMap()),
674 const_unsized: RefCell::new(FnvHashMap()),
675 const_globals: RefCell::new(FnvHashMap()),
676 const_values: RefCell::new(FnvHashMap()),
677 extern_const_values: RefCell::new(DefIdMap()),
678 statics: RefCell::new(FnvHashMap()),
679 impl_method_cache: RefCell::new(FnvHashMap()),
680 closure_bare_wrapper_cache: RefCell::new(FnvHashMap()),
681 statics_to_rauw: RefCell::new(Vec::new()),
682 lltypes: RefCell::new(FnvHashMap()),
683 llsizingtypes: RefCell::new(FnvHashMap()),
684 adt_reprs: RefCell::new(FnvHashMap()),
685 type_hashcodes: RefCell::new(FnvHashMap()),
686 int_type: Type::from_ref(ptr::null_mut()),
687 opaque_vec_type: Type::from_ref(ptr::null_mut()),
688 builder: BuilderRef_res(llvm::LLVMCreateBuilderInContext(llcx)),
689 closure_vals: RefCell::new(FnvHashMap()),
691 eh_personality: Cell::new(None),
692 eh_unwind_resume: Cell::new(None),
693 rust_try_fn: Cell::new(None),
694 intrinsics: RefCell::new(FnvHashMap()),
695 n_llvm_insns: Cell::new(0),
696 type_of_depth: Cell::new(0),
697 symbol_map: symbol_map,
700 let (int_type, opaque_vec_type, str_slice_ty, mut local_ccx) = {
701 // Do a little dance to create a dummy CrateContext, so we can
702 // create some things in the LLVM module of this codegen unit
703 let mut local_ccxs = vec![local_ccx];
704 let (int_type, opaque_vec_type, str_slice_ty) = {
705 let dummy_ccx = LocalCrateContext::dummy_ccx(shared,
706 local_ccxs.as_mut_slice());
707 let mut str_slice_ty = Type::named_struct(&dummy_ccx, "str_slice");
708 str_slice_ty.set_struct_body(&[Type::i8p(&dummy_ccx),
709 Type::int(&dummy_ccx)],
711 (Type::int(&dummy_ccx), Type::opaque_vec(&dummy_ccx), str_slice_ty)
713 (int_type, opaque_vec_type, str_slice_ty, local_ccxs.pop().unwrap())
716 local_ccx.int_type = int_type;
717 local_ccx.opaque_vec_type = opaque_vec_type;
718 local_ccx.tn.associate_type("str_slice", &str_slice_ty);
720 if shared.tcx.sess.count_llvm_insns() {
721 base::init_insn_ctxt()
728 /// Create a dummy `CrateContext` from `self` and the provided
729 /// `SharedCrateContext`. This is somewhat dangerous because `self` may
730 /// not be fully initialized.
732 /// This is used in the `LocalCrateContext` constructor to allow calling
733 /// functions that expect a complete `CrateContext`, even before the local
734 /// portion is fully initialized and attached to the `SharedCrateContext`.
735 fn dummy_ccx<'a>(shared: &'a SharedCrateContext<'a, 'tcx>,
736 local_ccxs: &'a [LocalCrateContext<'tcx>])
737 -> CrateContext<'a, 'tcx> {
738 assert!(local_ccxs.len() == 1);
742 local_ccxs: local_ccxs
747 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
748 pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> {
752 pub fn local(&self) -> &'b LocalCrateContext<'tcx> {
753 &self.local_ccxs[self.index]
756 /// Get a (possibly) different `CrateContext` from the same
757 /// `SharedCrateContext`.
758 pub fn rotate(&'b self) -> CrateContext<'b, 'tcx> {
762 .zip(0..self.local_ccxs.len())
763 .min_by_key(|&(local_ccx, _idx)| local_ccx.n_llvm_insns.get())
768 local_ccxs: &self.local_ccxs[..],
772 /// Either iterate over only `self`, or iterate over all `CrateContext`s in
773 /// the `SharedCrateContext`. The iterator produces `(ccx, is_origin)`
774 /// pairs, where `is_origin` is `true` if `ccx` is `self` and `false`
775 /// otherwise. This method is useful for avoiding code duplication in
776 /// cases where it may or may not be necessary to translate code into every
778 pub fn maybe_iter(&self, iter_all: bool) -> CrateContextMaybeIterator<'b, 'tcx> {
779 CrateContextMaybeIterator {
781 index: if iter_all { 0 } else { self.index },
784 local_ccxs: self.local_ccxs,
788 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
792 pub fn sess<'a>(&'a self) -> &'a Session {
793 &self.shared.tcx.sess
796 pub fn builder<'a>(&'a self) -> Builder<'a, 'tcx> {
800 pub fn raw_builder<'a>(&'a self) -> BuilderRef {
801 self.local().builder.b
804 pub fn get_intrinsic(&self, key: &str) -> ValueRef {
805 if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
808 match declare_intrinsic(self, key) {
810 None => bug!("unknown intrinsic '{}'", key)
814 pub fn llmod(&self) -> ModuleRef {
818 pub fn llcx(&self) -> ContextRef {
822 pub fn previous_work_product(&self) -> Option<&WorkProduct> {
823 self.local().previous_work_product.as_ref()
826 pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> {
827 &self.local().codegen_unit
830 pub fn td(&self) -> llvm::TargetDataRef {
831 unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
834 pub fn tn<'a>(&'a self) -> &'a TypeNames {
838 pub fn export_map<'a>(&'a self) -> &'a ExportMap {
839 &self.shared.export_map
842 pub fn reachable<'a>(&'a self) -> &'a NodeSet {
843 &self.shared.reachable
846 pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
847 &self.shared.link_meta
850 pub fn needs_unwind_cleanup_cache(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, bool>> {
851 &self.local().needs_unwind_cleanup_cache
854 pub fn fn_pointer_shims(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, ValueRef>> {
855 &self.local().fn_pointer_shims
858 pub fn drop_glues<'a>(&'a self)
859 -> &'a RefCell<FnvHashMap<DropGlueKind<'tcx>, (ValueRef, FnType)>> {
860 &self.local().drop_glues
863 pub fn local_node_for_inlined_defid<'a>(&'a self, def_id: DefId) -> Option<ast::NodeId> {
864 self.sess().cstore.local_node_for_inlined_defid(def_id)
867 pub fn defid_for_inlined_node<'a>(&'a self, node_id: ast::NodeId) -> Option<DefId> {
868 self.sess().cstore.defid_for_inlined_node(node_id)
871 pub fn instances<'a>(&'a self) -> &'a RefCell<FnvHashMap<Instance<'tcx>, ValueRef>> {
872 &self.local().instances
875 pub fn vtables<'a>(&'a self) -> &'a RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>> {
876 &self.local().vtables
879 pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<InternedString, ValueRef>> {
880 &self.local().const_cstr_cache
883 pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
884 &self.local().const_unsized
887 pub fn const_globals<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
888 &self.local().const_globals
891 pub fn const_values<'a>(&'a self) -> &'a RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>),
893 &self.local().const_values
896 pub fn extern_const_values<'a>(&'a self) -> &'a RefCell<DefIdMap<ValueRef>> {
897 &self.local().extern_const_values
900 pub fn statics<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, DefId>> {
901 &self.local().statics
904 pub fn impl_method_cache<'a>(&'a self)
905 -> &'a RefCell<FnvHashMap<(DefId, ast::Name), DefId>> {
906 &self.local().impl_method_cache
909 pub fn closure_bare_wrapper_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
910 &self.local().closure_bare_wrapper_cache
913 pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> {
914 &self.local().statics_to_rauw
917 pub fn lltypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
918 &self.local().lltypes
921 pub fn llsizingtypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
922 &self.local().llsizingtypes
925 pub fn adt_reprs<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Rc<adt::Repr<'tcx>>>> {
926 &self.local().adt_reprs
929 pub fn symbol_hasher<'a>(&'a self) -> &'a RefCell<Sha256> {
930 &self.shared.symbol_hasher
933 pub fn type_hashcodes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, String>> {
934 &self.local().type_hashcodes
937 pub fn stats<'a>(&'a self) -> &'a Stats {
941 pub fn int_type(&self) -> Type {
942 self.local().int_type
945 pub fn opaque_vec_type(&self) -> Type {
946 self.local().opaque_vec_type
949 pub fn closure_vals<'a>(&'a self) -> &'a RefCell<FnvHashMap<Instance<'tcx>, ValueRef>> {
950 &self.local().closure_vals
953 pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
957 pub fn eh_personality<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
958 &self.local().eh_personality
961 pub fn eh_unwind_resume<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
962 &self.local().eh_unwind_resume
965 pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
966 &self.local().rust_try_fn
969 fn intrinsics<'a>(&'a self) -> &'a RefCell<FnvHashMap<&'static str, ValueRef>> {
970 &self.local().intrinsics
973 pub fn count_llvm_insn(&self) {
974 self.local().n_llvm_insns.set(self.local().n_llvm_insns.get() + 1);
977 pub fn obj_size_bound(&self) -> u64 {
978 self.tcx().data_layout.obj_size_bound()
981 pub fn report_overbig_object(&self, obj: Ty<'tcx>) -> ! {
983 &format!("the type `{:?}` is too big for the current architecture",
987 pub fn enter_type_of(&self, ty: Ty<'tcx>) -> TypeOfDepthLock<'b, 'tcx> {
988 let current_depth = self.local().type_of_depth.get();
989 debug!("enter_type_of({:?}) at depth {:?}", ty, current_depth);
990 if current_depth > self.sess().recursion_limit.get() {
992 &format!("overflow representing the type `{}`", ty))
994 self.local().type_of_depth.set(current_depth + 1);
995 TypeOfDepthLock(self.local())
998 pub fn layout_of(&self, ty: Ty<'tcx>) -> &'tcx ty::layout::Layout {
999 self.tcx().infer_ctxt(None, None, traits::Reveal::All).enter(|infcx| {
1000 ty.layout(&infcx).unwrap_or_else(|e| {
1001 bug!("failed to get layout for `{}`: {}", ty, e);
1006 pub fn check_overflow(&self) -> bool {
1007 self.shared.check_overflow
1010 pub fn use_dll_storage_attrs(&self) -> bool {
1011 self.shared.use_dll_storage_attrs()
1014 pub fn get_mir(&self, def_id: DefId) -> Option<CachedMir<'b, 'tcx>> {
1015 self.shared.get_mir(def_id)
1018 pub fn symbol_map(&self) -> &SymbolMap<'tcx> {
1019 &*self.local().symbol_map
1022 pub fn translation_items(&self) -> &RefCell<FnvHashSet<TransItem<'tcx>>> {
1023 &self.shared.translation_items
1026 /// Given the def-id of some item that has no type parameters, make
1027 /// a suitable "empty substs" for it.
1028 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
1029 self.shared().empty_substs_for_def_id(item_def_id)
1033 pub struct TypeOfDepthLock<'a, 'tcx: 'a>(&'a LocalCrateContext<'tcx>);
1035 impl<'a, 'tcx> Drop for TypeOfDepthLock<'a, 'tcx> {
1036 fn drop(&mut self) {
1037 self.0.type_of_depth.set(self.0.type_of_depth.get() - 1);
1041 /// Declare any llvm intrinsics that you might need
1042 fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> {
1044 ($name:expr, fn() -> $ret:expr) => (
1046 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret));
1047 llvm::SetUnnamedAddr(f, false);
1048 ccx.intrinsics().borrow_mut().insert($name, f.clone());
1052 ($name:expr, fn(...) -> $ret:expr) => (
1054 let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret));
1055 llvm::SetUnnamedAddr(f, false);
1056 ccx.intrinsics().borrow_mut().insert($name, f.clone());
1060 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
1062 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret));
1063 llvm::SetUnnamedAddr(f, false);
1064 ccx.intrinsics().borrow_mut().insert($name, f.clone());
1069 macro_rules! mk_struct {
1070 ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
1073 let i8p = Type::i8p(ccx);
1074 let void = Type::void(ccx);
1075 let i1 = Type::i1(ccx);
1076 let t_i8 = Type::i8(ccx);
1077 let t_i16 = Type::i16(ccx);
1078 let t_i32 = Type::i32(ccx);
1079 let t_i64 = Type::i64(ccx);
1080 let t_f32 = Type::f32(ccx);
1081 let t_f64 = Type::f64(ccx);
1083 ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
1084 ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
1085 ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
1086 ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
1087 ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
1088 ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
1089 ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
1090 ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
1091 ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
1093 ifn!("llvm.trap", fn() -> void);
1094 ifn!("llvm.debugtrap", fn() -> void);
1095 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
1097 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
1098 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
1099 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
1100 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
1102 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
1103 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
1104 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
1105 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
1106 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
1107 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
1108 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
1109 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
1110 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
1111 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
1112 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
1113 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
1114 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
1115 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
1116 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
1117 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
1119 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
1120 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
1122 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
1123 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
1125 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
1126 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
1127 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
1128 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
1129 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
1130 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
1132 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
1133 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
1134 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
1135 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
1137 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
1138 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
1139 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
1140 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
1142 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
1143 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
1144 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
1145 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
1147 ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
1148 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
1149 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
1150 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
1152 ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
1153 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
1154 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
1155 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
1157 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
1158 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
1159 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
1161 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1162 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1163 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1164 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1166 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1167 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1168 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1169 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1171 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1172 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1173 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1174 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1176 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1177 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1178 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1179 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1181 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1182 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1183 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1184 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1186 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1187 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1188 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1189 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1191 ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
1192 ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
1194 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
1195 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
1196 ifn!("llvm.localescape", fn(...) -> void);
1197 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
1198 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
1200 ifn!("llvm.assume", fn(i1) -> void);
1202 if ccx.sess().opts.debuginfo != NoDebugInfo {
1203 ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
1204 ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);