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};
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, VecPerParamSpace};
34 use rustc::ty::{self, Ty, TyCtxt};
35 use session::config::NoDebugInfo;
37 use symbol_map::SymbolMap;
38 use util::sha2::Sha256;
39 use util::nodemap::{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_fallback_instantiations: Cell<usize>,
56 pub n_fns: Cell<usize>,
57 pub n_monos: Cell<usize>,
58 pub n_inlines: Cell<usize>,
59 pub n_closures: Cell<usize>,
60 pub n_llvm_insns: Cell<usize>,
61 pub llvm_insns: RefCell<FnvHashMap<String, usize>>,
62 // (ident, llvm-instructions)
63 pub fn_stats: RefCell<Vec<(String, usize)> >,
66 /// The shared portion of a `CrateContext`. There is one `SharedCrateContext`
67 /// per crate. The data here is shared between all compilation units of the
68 /// crate, so it must not contain references to any LLVM data structures
69 /// (aside from metadata-related ones).
70 pub struct SharedCrateContext<'a, 'tcx: 'a> {
71 metadata_llmod: ModuleRef,
72 metadata_llcx: ContextRef,
74 export_map: ExportMap,
77 symbol_hasher: RefCell<Sha256>,
78 tcx: TyCtxt<'a, 'tcx, 'tcx>,
81 check_drop_flag_for_sanity: bool,
82 mir_map: &'a MirMap<'tcx>,
83 mir_cache: RefCell<DefIdMap<Rc<mir::Mir<'tcx>>>>,
85 use_dll_storage_attrs: bool,
87 translation_items: RefCell<FnvHashSet<TransItem<'tcx>>>,
88 trait_cache: RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>>,
91 /// The local portion of a `CrateContext`. There is one `LocalCrateContext`
92 /// per compilation unit. Each one has its own LLVM `ContextRef` so that
93 /// several compilation units may be optimized in parallel. All other LLVM
94 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
95 pub struct LocalCrateContext<'tcx> {
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 /// Track mapping of external ids to local items imported for inlining
104 external: RefCell<DefIdMap<Option<ast::NodeId>>>,
105 /// Backwards version of the `external` map (inlined items to where they
107 external_srcs: RefCell<NodeMap<DefId>>,
108 /// Cache instances of monomorphic and polymorphic items
109 instances: RefCell<FnvHashMap<Instance<'tcx>, ValueRef>>,
110 monomorphizing: RefCell<DefIdMap<usize>>,
111 /// Cache generated vtables
112 vtables: RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>>,
113 /// Cache of constant strings,
114 const_cstr_cache: RefCell<FnvHashMap<InternedString, ValueRef>>,
116 /// Reverse-direction for const ptrs cast from globals.
117 /// Key is a ValueRef holding a *T,
118 /// Val is a ValueRef holding a *[T].
120 /// Needed because LLVM loses pointer->pointee association
121 /// when we ptrcast, and we have to ptrcast during translation
122 /// of a [T] const because we form a slice, a (*T,usize) pair, not
123 /// a pointer to an LLVM array type. Similar for trait objects.
124 const_unsized: RefCell<FnvHashMap<ValueRef, ValueRef>>,
126 /// Cache of emitted const globals (value -> global)
127 const_globals: RefCell<FnvHashMap<ValueRef, ValueRef>>,
129 /// Cache of emitted const values
130 const_values: RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>), ValueRef>>,
132 /// Cache of external const values
133 extern_const_values: RefCell<DefIdMap<ValueRef>>,
135 /// Mapping from static definitions to their DefId's.
136 statics: RefCell<FnvHashMap<ValueRef, DefId>>,
138 impl_method_cache: RefCell<FnvHashMap<(DefId, ast::Name), DefId>>,
140 /// Cache of closure wrappers for bare fn's.
141 closure_bare_wrapper_cache: RefCell<FnvHashMap<ValueRef, ValueRef>>,
143 /// List of globals for static variables which need to be passed to the
144 /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete.
145 /// (We have to make sure we don't invalidate any ValueRefs referring
147 statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>,
149 lltypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
150 llsizingtypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
151 adt_reprs: RefCell<FnvHashMap<Ty<'tcx>, Rc<adt::Repr<'tcx>>>>,
152 type_hashcodes: RefCell<FnvHashMap<Ty<'tcx>, String>>,
154 opaque_vec_type: Type,
155 builder: BuilderRef_res,
157 /// Holds the LLVM values for closure IDs.
158 closure_vals: RefCell<FnvHashMap<Instance<'tcx>, ValueRef>>,
160 dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>,
162 eh_personality: Cell<Option<ValueRef>>,
163 eh_unwind_resume: Cell<Option<ValueRef>>,
164 rust_try_fn: Cell<Option<ValueRef>>,
166 intrinsics: RefCell<FnvHashMap<&'static str, ValueRef>>,
168 /// Number of LLVM instructions translated into this `LocalCrateContext`.
169 /// This is used to perform some basic load-balancing to keep all LLVM
170 /// contexts around the same size.
171 n_llvm_insns: Cell<usize>,
173 /// Depth of the current type-of computation - used to bail out
174 type_of_depth: Cell<usize>,
176 symbol_map: Rc<SymbolMap<'tcx>>,
179 // Implement DepTrackingMapConfig for `trait_cache`
180 pub struct TraitSelectionCache<'tcx> {
181 data: PhantomData<&'tcx ()>
184 impl<'tcx> DepTrackingMapConfig for TraitSelectionCache<'tcx> {
185 type Key = ty::PolyTraitRef<'tcx>;
186 type Value = traits::Vtable<'tcx, ()>;
187 fn to_dep_node(key: &ty::PolyTraitRef<'tcx>) -> DepNode<DefId> {
188 key.to_poly_trait_predicate().dep_node()
192 /// This list owns a number of LocalCrateContexts and binds them to their common
193 /// SharedCrateContext. This type just exists as a convenience, something to
194 /// pass around all LocalCrateContexts with and get an iterator over them.
195 pub struct CrateContextList<'a, 'tcx: 'a> {
196 shared: &'a SharedCrateContext<'a, 'tcx>,
197 local_ccxs: Vec<LocalCrateContext<'tcx>>,
200 impl<'a, 'tcx: 'a> CrateContextList<'a, 'tcx> {
202 pub fn new(shared_ccx: &'a SharedCrateContext<'a, 'tcx>,
203 codegen_units: Vec<CodegenUnit<'tcx>>,
204 symbol_map: Rc<SymbolMap<'tcx>>)
205 -> CrateContextList<'a, 'tcx> {
208 local_ccxs: codegen_units.into_iter().map(|codegen_unit| {
209 LocalCrateContext::new(shared_ccx, codegen_unit, symbol_map.clone())
214 pub fn iter<'b>(&'b self) -> CrateContextIterator<'b, 'tcx> {
215 CrateContextIterator {
218 local_ccxs: &self.local_ccxs[..]
222 pub fn shared(&self) -> &'a SharedCrateContext<'a, 'tcx> {
227 /// A CrateContext value binds together one LocalCrateContext with the
228 /// SharedCrateContext. It exists as a convenience wrapper, so we don't have to
229 /// pass around (SharedCrateContext, LocalCrateContext) tuples all over trans.
230 pub struct CrateContext<'a, 'tcx: 'a> {
231 shared: &'a SharedCrateContext<'a, 'tcx>,
232 local_ccxs: &'a [LocalCrateContext<'tcx>],
233 /// The index of `local` in `local_ccxs`. This is used in
234 /// `maybe_iter(true)` to identify the original `LocalCrateContext`.
238 pub struct CrateContextIterator<'a, 'tcx: 'a> {
239 shared: &'a SharedCrateContext<'a, 'tcx>,
240 local_ccxs: &'a [LocalCrateContext<'tcx>],
244 impl<'a, 'tcx> Iterator for CrateContextIterator<'a,'tcx> {
245 type Item = CrateContext<'a, 'tcx>;
247 fn next(&mut self) -> Option<CrateContext<'a, 'tcx>> {
248 if self.index >= self.local_ccxs.len() {
252 let index = self.index;
258 local_ccxs: self.local_ccxs,
263 /// The iterator produced by `CrateContext::maybe_iter`.
264 pub struct CrateContextMaybeIterator<'a, 'tcx: 'a> {
265 shared: &'a SharedCrateContext<'a, 'tcx>,
266 local_ccxs: &'a [LocalCrateContext<'tcx>],
272 impl<'a, 'tcx> Iterator for CrateContextMaybeIterator<'a, 'tcx> {
273 type Item = (CrateContext<'a, 'tcx>, bool);
275 fn next(&mut self) -> Option<(CrateContext<'a, 'tcx>, bool)> {
276 if self.index >= self.local_ccxs.len() {
280 let index = self.index;
283 self.index = self.local_ccxs.len();
286 let ccx = CrateContext {
289 local_ccxs: self.local_ccxs
291 Some((ccx, index == self.origin))
295 unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
296 let llcx = llvm::LLVMContextCreate();
297 let mod_name = CString::new(mod_name).unwrap();
298 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
300 // Ensure the data-layout values hardcoded remain the defaults.
301 if sess.target.target.options.is_builtin {
302 let tm = ::back::write::create_target_machine(sess);
303 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
304 llvm::LLVMRustDisposeTargetMachine(tm);
306 let data_layout = llvm::LLVMGetDataLayout(llmod);
307 let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes())
308 .ok().expect("got a non-UTF8 data-layout from LLVM");
310 if sess.target.target.data_layout != data_layout {
311 bug!("data-layout for builtin `{}` target, `{}`, \
312 differs from LLVM default, `{}`",
313 sess.target.target.llvm_target,
314 sess.target.target.data_layout,
319 let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap();
320 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
322 let llvm_target = sess.target.target.llvm_target.as_bytes();
323 let llvm_target = CString::new(llvm_target).unwrap();
324 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
328 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
329 pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
330 mir_map: &'b MirMap<'tcx>,
331 export_map: ExportMap,
332 symbol_hasher: Sha256,
335 check_overflow: bool,
336 check_drop_flag_for_sanity: bool)
337 -> SharedCrateContext<'b, 'tcx> {
338 let (metadata_llcx, metadata_llmod) = unsafe {
339 create_context_and_module(&tcx.sess, "metadata")
342 // An interesting part of Windows which MSVC forces our hand on (and
343 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
344 // attributes in LLVM IR as well as native dependencies (in C these
345 // correspond to `__declspec(dllimport)`).
347 // Whenever a dynamic library is built by MSVC it must have its public
348 // interface specified by functions tagged with `dllexport` or otherwise
349 // they're not available to be linked against. This poses a few problems
350 // for the compiler, some of which are somewhat fundamental, but we use
351 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
352 // attribute to all LLVM functions that are reachable (e.g. they're
353 // already tagged with external linkage). This is suboptimal for a few
356 // * If an object file will never be included in a dynamic library,
357 // there's no need to attach the dllexport attribute. Most object
358 // files in Rust are not destined to become part of a dll as binaries
359 // are statically linked by default.
360 // * If the compiler is emitting both an rlib and a dylib, the same
361 // source object file is currently used but with MSVC this may be less
362 // feasible. The compiler may be able to get around this, but it may
363 // involve some invasive changes to deal with this.
365 // The flipside of this situation is that whenever you link to a dll and
366 // you import a function from it, the import should be tagged with
367 // `dllimport`. At this time, however, the compiler does not emit
368 // `dllimport` for any declarations other than constants (where it is
369 // required), which is again suboptimal for even more reasons!
371 // * Calling a function imported from another dll without using
372 // `dllimport` causes the linker/compiler to have extra overhead (one
373 // `jmp` instruction on x86) when calling the function.
374 // * The same object file may be used in different circumstances, so a
375 // function may be imported from a dll if the object is linked into a
376 // dll, but it may be just linked against if linked into an rlib.
377 // * The compiler has no knowledge about whether native functions should
378 // be tagged dllimport or not.
380 // For now the compiler takes the perf hit (I do not have any numbers to
381 // this effect) by marking very little as `dllimport` and praying the
382 // linker will take care of everything. Fixing this problem will likely
383 // require adding a few attributes to Rust itself (feature gated at the
384 // start) and then strongly recommending static linkage on MSVC!
385 let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc;
388 metadata_llmod: metadata_llmod,
389 metadata_llcx: metadata_llcx,
390 export_map: export_map,
391 reachable: reachable,
392 link_meta: link_meta,
393 symbol_hasher: RefCell::new(symbol_hasher),
396 mir_cache: RefCell::new(DefIdMap()),
398 n_glues_created: Cell::new(0),
399 n_null_glues: Cell::new(0),
400 n_real_glues: Cell::new(0),
401 n_fallback_instantiations: Cell::new(0),
403 n_monos: Cell::new(0),
404 n_inlines: Cell::new(0),
405 n_closures: Cell::new(0),
406 n_llvm_insns: Cell::new(0),
407 llvm_insns: RefCell::new(FnvHashMap()),
408 fn_stats: RefCell::new(Vec::new()),
410 check_overflow: check_overflow,
411 check_drop_flag_for_sanity: check_drop_flag_for_sanity,
412 use_dll_storage_attrs: use_dll_storage_attrs,
413 translation_items: RefCell::new(FnvHashSet()),
414 trait_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
418 pub fn metadata_llmod(&self) -> ModuleRef {
422 pub fn metadata_llcx(&self) -> ContextRef {
426 pub fn export_map<'a>(&'a self) -> &'a ExportMap {
430 pub fn reachable<'a>(&'a self) -> &'a NodeSet {
434 pub fn trait_cache(&self) -> &RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>> {
438 pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
442 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
446 pub fn sess<'a>(&'a self) -> &'a Session {
450 pub fn stats<'a>(&'a self) -> &'a Stats {
454 pub fn use_dll_storage_attrs(&self) -> bool {
455 self.use_dll_storage_attrs
458 pub fn get_mir(&self, def_id: DefId) -> Option<CachedMir<'b, 'tcx>> {
459 if def_id.is_local() {
460 let node_id = self.tcx.map.as_local_node_id(def_id).unwrap();
461 self.mir_map.map.get(&node_id).map(CachedMir::Ref)
463 if let Some(mir) = self.mir_cache.borrow().get(&def_id).cloned() {
464 return Some(CachedMir::Owned(mir));
467 let mir = self.sess().cstore.maybe_get_item_mir(self.tcx, def_id);
468 let cached = mir.map(Rc::new);
469 if let Some(ref mir) = cached {
470 self.mir_cache.borrow_mut().insert(def_id, mir.clone());
472 cached.map(CachedMir::Owned)
476 pub fn translation_items(&self) -> &RefCell<FnvHashSet<TransItem<'tcx>>> {
477 &self.translation_items
480 /// Given the def-id of some item that has no type parameters, make
481 /// a suitable "empty substs" for it.
482 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
483 let scheme = self.tcx().lookup_item_type(item_def_id);
484 self.empty_substs_for_scheme(&scheme)
487 pub fn empty_substs_for_scheme(&self, scheme: &ty::TypeScheme<'tcx>)
488 -> &'tcx Substs<'tcx> {
489 assert!(scheme.generics.types.is_empty());
490 self.tcx().mk_substs(
491 Substs::new(VecPerParamSpace::empty(),
492 scheme.generics.regions.map(|_| ty::ReErased)))
495 pub fn symbol_hasher(&self) -> &RefCell<Sha256> {
499 pub fn mir_map(&self) -> &MirMap<'tcx> {
503 pub fn metadata_symbol_name(&self) -> String {
504 format!("rust_metadata_{}_{}",
505 self.link_meta().crate_name,
506 self.link_meta().crate_hash)
510 impl<'tcx> LocalCrateContext<'tcx> {
511 fn new<'a>(shared: &SharedCrateContext<'a, 'tcx>,
512 codegen_unit: CodegenUnit<'tcx>,
513 symbol_map: Rc<SymbolMap<'tcx>>)
514 -> LocalCrateContext<'tcx> {
516 // Append ".rs" to LLVM module identifier.
518 // LLVM code generator emits a ".file filename" directive
519 // for ELF backends. Value of the "filename" is set as the
520 // LLVM module identifier. Due to a LLVM MC bug[1], LLVM
521 // crashes if the module identifier is same as other symbols
522 // such as a function name in the module.
523 // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
524 let llmod_id = format!("{}.rs", codegen_unit.name);
526 let (llcx, llmod) = create_context_and_module(&shared.tcx.sess,
529 let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
530 Some(debuginfo::CrateDebugContext::new(llmod))
535 let local_ccx = LocalCrateContext {
538 codegen_unit: codegen_unit,
539 tn: TypeNames::new(),
540 needs_unwind_cleanup_cache: RefCell::new(FnvHashMap()),
541 fn_pointer_shims: RefCell::new(FnvHashMap()),
542 drop_glues: RefCell::new(FnvHashMap()),
543 external: RefCell::new(DefIdMap()),
544 external_srcs: RefCell::new(NodeMap()),
545 instances: RefCell::new(FnvHashMap()),
546 monomorphizing: RefCell::new(DefIdMap()),
547 vtables: RefCell::new(FnvHashMap()),
548 const_cstr_cache: RefCell::new(FnvHashMap()),
549 const_unsized: RefCell::new(FnvHashMap()),
550 const_globals: RefCell::new(FnvHashMap()),
551 const_values: RefCell::new(FnvHashMap()),
552 extern_const_values: RefCell::new(DefIdMap()),
553 statics: RefCell::new(FnvHashMap()),
554 impl_method_cache: RefCell::new(FnvHashMap()),
555 closure_bare_wrapper_cache: RefCell::new(FnvHashMap()),
556 statics_to_rauw: RefCell::new(Vec::new()),
557 lltypes: RefCell::new(FnvHashMap()),
558 llsizingtypes: RefCell::new(FnvHashMap()),
559 adt_reprs: RefCell::new(FnvHashMap()),
560 type_hashcodes: RefCell::new(FnvHashMap()),
561 int_type: Type::from_ref(ptr::null_mut()),
562 opaque_vec_type: Type::from_ref(ptr::null_mut()),
563 builder: BuilderRef_res(llvm::LLVMCreateBuilderInContext(llcx)),
564 closure_vals: RefCell::new(FnvHashMap()),
566 eh_personality: Cell::new(None),
567 eh_unwind_resume: Cell::new(None),
568 rust_try_fn: Cell::new(None),
569 intrinsics: RefCell::new(FnvHashMap()),
570 n_llvm_insns: Cell::new(0),
571 type_of_depth: Cell::new(0),
572 symbol_map: symbol_map,
575 let (int_type, opaque_vec_type, str_slice_ty, mut local_ccx) = {
576 // Do a little dance to create a dummy CrateContext, so we can
577 // create some things in the LLVM module of this codegen unit
578 let mut local_ccxs = vec![local_ccx];
579 let (int_type, opaque_vec_type, str_slice_ty) = {
580 let dummy_ccx = LocalCrateContext::dummy_ccx(shared,
581 local_ccxs.as_mut_slice());
582 let mut str_slice_ty = Type::named_struct(&dummy_ccx, "str_slice");
583 str_slice_ty.set_struct_body(&[Type::i8p(&dummy_ccx),
584 Type::int(&dummy_ccx)],
586 (Type::int(&dummy_ccx), Type::opaque_vec(&dummy_ccx), str_slice_ty)
588 (int_type, opaque_vec_type, str_slice_ty, local_ccxs.pop().unwrap())
591 local_ccx.int_type = int_type;
592 local_ccx.opaque_vec_type = opaque_vec_type;
593 local_ccx.tn.associate_type("str_slice", &str_slice_ty);
595 if shared.tcx.sess.count_llvm_insns() {
596 base::init_insn_ctxt()
603 /// Create a dummy `CrateContext` from `self` and the provided
604 /// `SharedCrateContext`. This is somewhat dangerous because `self` may
605 /// not be fully initialized.
607 /// This is used in the `LocalCrateContext` constructor to allow calling
608 /// functions that expect a complete `CrateContext`, even before the local
609 /// portion is fully initialized and attached to the `SharedCrateContext`.
610 fn dummy_ccx<'a>(shared: &'a SharedCrateContext<'a, 'tcx>,
611 local_ccxs: &'a [LocalCrateContext<'tcx>])
612 -> CrateContext<'a, 'tcx> {
613 assert!(local_ccxs.len() == 1);
617 local_ccxs: local_ccxs
622 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
623 pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> {
627 pub fn local(&self) -> &'b LocalCrateContext<'tcx> {
628 &self.local_ccxs[self.index]
631 /// Get a (possibly) different `CrateContext` from the same
632 /// `SharedCrateContext`.
633 pub fn rotate(&'b self) -> CrateContext<'b, 'tcx> {
637 .zip(0..self.local_ccxs.len())
638 .min_by_key(|&(local_ccx, _idx)| local_ccx.n_llvm_insns.get())
643 local_ccxs: &self.local_ccxs[..],
647 /// Either iterate over only `self`, or iterate over all `CrateContext`s in
648 /// the `SharedCrateContext`. The iterator produces `(ccx, is_origin)`
649 /// pairs, where `is_origin` is `true` if `ccx` is `self` and `false`
650 /// otherwise. This method is useful for avoiding code duplication in
651 /// cases where it may or may not be necessary to translate code into every
653 pub fn maybe_iter(&self, iter_all: bool) -> CrateContextMaybeIterator<'b, 'tcx> {
654 CrateContextMaybeIterator {
656 index: if iter_all { 0 } else { self.index },
659 local_ccxs: self.local_ccxs,
663 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
667 pub fn sess<'a>(&'a self) -> &'a Session {
668 &self.shared.tcx.sess
671 pub fn builder<'a>(&'a self) -> Builder<'a, 'tcx> {
675 pub fn raw_builder<'a>(&'a self) -> BuilderRef {
676 self.local().builder.b
679 pub fn get_intrinsic(&self, key: &str) -> ValueRef {
680 if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
683 match declare_intrinsic(self, key) {
685 None => bug!("unknown intrinsic '{}'", key)
689 pub fn llmod(&self) -> ModuleRef {
693 pub fn llcx(&self) -> ContextRef {
697 pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> {
698 &self.local().codegen_unit
701 pub fn td(&self) -> llvm::TargetDataRef {
702 unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
705 pub fn tn<'a>(&'a self) -> &'a TypeNames {
709 pub fn export_map<'a>(&'a self) -> &'a ExportMap {
710 &self.shared.export_map
713 pub fn reachable<'a>(&'a self) -> &'a NodeSet {
714 &self.shared.reachable
717 pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
718 &self.shared.link_meta
721 pub fn needs_unwind_cleanup_cache(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, bool>> {
722 &self.local().needs_unwind_cleanup_cache
725 pub fn fn_pointer_shims(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, ValueRef>> {
726 &self.local().fn_pointer_shims
729 pub fn drop_glues<'a>(&'a self)
730 -> &'a RefCell<FnvHashMap<DropGlueKind<'tcx>, (ValueRef, FnType)>> {
731 &self.local().drop_glues
734 pub fn external<'a>(&'a self) -> &'a RefCell<DefIdMap<Option<ast::NodeId>>> {
735 &self.local().external
738 pub fn external_srcs<'a>(&'a self) -> &'a RefCell<NodeMap<DefId>> {
739 &self.local().external_srcs
742 pub fn instances<'a>(&'a self) -> &'a RefCell<FnvHashMap<Instance<'tcx>, ValueRef>> {
743 &self.local().instances
746 pub fn monomorphizing<'a>(&'a self) -> &'a RefCell<DefIdMap<usize>> {
747 &self.local().monomorphizing
750 pub fn vtables<'a>(&'a self) -> &'a RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>> {
751 &self.local().vtables
754 pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<InternedString, ValueRef>> {
755 &self.local().const_cstr_cache
758 pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
759 &self.local().const_unsized
762 pub fn const_globals<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
763 &self.local().const_globals
766 pub fn const_values<'a>(&'a self) -> &'a RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>),
768 &self.local().const_values
771 pub fn extern_const_values<'a>(&'a self) -> &'a RefCell<DefIdMap<ValueRef>> {
772 &self.local().extern_const_values
775 pub fn statics<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, DefId>> {
776 &self.local().statics
779 pub fn impl_method_cache<'a>(&'a self)
780 -> &'a RefCell<FnvHashMap<(DefId, ast::Name), DefId>> {
781 &self.local().impl_method_cache
784 pub fn closure_bare_wrapper_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
785 &self.local().closure_bare_wrapper_cache
788 pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> {
789 &self.local().statics_to_rauw
792 pub fn lltypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
793 &self.local().lltypes
796 pub fn llsizingtypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
797 &self.local().llsizingtypes
800 pub fn adt_reprs<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Rc<adt::Repr<'tcx>>>> {
801 &self.local().adt_reprs
804 pub fn symbol_hasher<'a>(&'a self) -> &'a RefCell<Sha256> {
805 &self.shared.symbol_hasher
808 pub fn type_hashcodes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, String>> {
809 &self.local().type_hashcodes
812 pub fn stats<'a>(&'a self) -> &'a Stats {
816 pub fn int_type(&self) -> Type {
817 self.local().int_type
820 pub fn opaque_vec_type(&self) -> Type {
821 self.local().opaque_vec_type
824 pub fn closure_vals<'a>(&'a self) -> &'a RefCell<FnvHashMap<Instance<'tcx>, ValueRef>> {
825 &self.local().closure_vals
828 pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
832 pub fn eh_personality<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
833 &self.local().eh_personality
836 pub fn eh_unwind_resume<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
837 &self.local().eh_unwind_resume
840 pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
841 &self.local().rust_try_fn
844 fn intrinsics<'a>(&'a self) -> &'a RefCell<FnvHashMap<&'static str, ValueRef>> {
845 &self.local().intrinsics
848 pub fn count_llvm_insn(&self) {
849 self.local().n_llvm_insns.set(self.local().n_llvm_insns.get() + 1);
852 pub fn obj_size_bound(&self) -> u64 {
853 self.tcx().data_layout.obj_size_bound()
856 pub fn report_overbig_object(&self, obj: Ty<'tcx>) -> ! {
858 &format!("the type `{:?}` is too big for the current architecture",
862 pub fn enter_type_of(&self, ty: Ty<'tcx>) -> TypeOfDepthLock<'b, 'tcx> {
863 let current_depth = self.local().type_of_depth.get();
864 debug!("enter_type_of({:?}) at depth {:?}", ty, current_depth);
865 if current_depth > self.sess().recursion_limit.get() {
867 &format!("overflow representing the type `{}`", ty))
869 self.local().type_of_depth.set(current_depth + 1);
870 TypeOfDepthLock(self.local())
873 pub fn check_overflow(&self) -> bool {
874 self.shared.check_overflow
877 pub fn check_drop_flag_for_sanity(&self) -> bool {
878 // This controls whether we emit a conditional llvm.debugtrap
879 // guarded on whether the dropflag is one of its (two) valid
881 self.shared.check_drop_flag_for_sanity
884 pub fn use_dll_storage_attrs(&self) -> bool {
885 self.shared.use_dll_storage_attrs()
888 pub fn get_mir(&self, def_id: DefId) -> Option<CachedMir<'b, 'tcx>> {
889 self.shared.get_mir(def_id)
892 pub fn symbol_map(&self) -> &SymbolMap<'tcx> {
893 &*self.local().symbol_map
896 pub fn translation_items(&self) -> &RefCell<FnvHashSet<TransItem<'tcx>>> {
897 &self.shared.translation_items
900 /// Given the def-id of some item that has no type parameters, make
901 /// a suitable "empty substs" for it.
902 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
903 self.shared().empty_substs_for_def_id(item_def_id)
906 pub fn empty_substs_for_scheme(&self, scheme: &ty::TypeScheme<'tcx>)
907 -> &'tcx Substs<'tcx> {
908 self.shared().empty_substs_for_scheme(scheme)
912 pub struct TypeOfDepthLock<'a, 'tcx: 'a>(&'a LocalCrateContext<'tcx>);
914 impl<'a, 'tcx> Drop for TypeOfDepthLock<'a, 'tcx> {
916 self.0.type_of_depth.set(self.0.type_of_depth.get() - 1);
920 /// Declare any llvm intrinsics that you might need
921 fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> {
923 ($name:expr, fn() -> $ret:expr) => (
925 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret));
926 llvm::SetUnnamedAddr(f, false);
927 ccx.intrinsics().borrow_mut().insert($name, f.clone());
931 ($name:expr, fn(...) -> $ret:expr) => (
933 let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret));
934 llvm::SetUnnamedAddr(f, false);
935 ccx.intrinsics().borrow_mut().insert($name, f.clone());
939 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
941 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret));
942 llvm::SetUnnamedAddr(f, false);
943 ccx.intrinsics().borrow_mut().insert($name, f.clone());
948 macro_rules! mk_struct {
949 ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
952 let i8p = Type::i8p(ccx);
953 let void = Type::void(ccx);
954 let i1 = Type::i1(ccx);
955 let t_i8 = Type::i8(ccx);
956 let t_i16 = Type::i16(ccx);
957 let t_i32 = Type::i32(ccx);
958 let t_i64 = Type::i64(ccx);
959 let t_f32 = Type::f32(ccx);
960 let t_f64 = Type::f64(ccx);
962 ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
963 ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
964 ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
965 ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
966 ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
967 ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
968 ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
969 ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
970 ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
972 ifn!("llvm.trap", fn() -> void);
973 ifn!("llvm.debugtrap", fn() -> void);
974 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
976 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
977 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
978 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
979 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
981 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
982 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
983 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
984 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
985 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
986 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
987 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
988 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
989 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
990 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
991 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
992 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
993 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
994 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
995 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
996 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
998 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
999 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
1001 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
1002 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
1004 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
1005 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
1006 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
1007 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
1008 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
1009 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
1011 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
1012 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
1013 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
1014 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
1016 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
1017 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
1018 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
1019 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
1021 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
1022 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
1023 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
1024 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
1026 ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
1027 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
1028 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
1029 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
1031 ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
1032 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
1033 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
1034 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
1036 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
1037 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
1038 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
1040 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1041 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1042 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1043 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1045 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1046 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1047 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1048 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1050 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1051 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1052 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1053 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1055 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1056 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1057 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1058 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1060 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1061 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1062 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1063 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1065 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1066 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1067 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1068 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1070 ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
1071 ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
1073 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
1074 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
1075 ifn!("llvm.localescape", fn(...) -> void);
1076 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
1077 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
1079 ifn!("llvm.assume", fn(i1) -> void);
1081 if ccx.sess().opts.debuginfo != NoDebugInfo {
1082 ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
1083 ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);