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};
13 use rustc::dep_graph::{DepGraph, DepGraphSafe, DepNode, DepTrackingMap, DepTrackingMapConfig};
15 use rustc::hir::def_id::DefId;
21 use monomorphize::Instance;
23 use partitioning::CodegenUnit;
24 use trans_item::TransItem;
26 use rustc_data_structures::base_n;
27 use rustc::ty::subst::Substs;
28 use rustc::ty::{self, Ty, TyCtxt};
29 use rustc::ty::layout::{LayoutTyper, TyLayout};
30 use session::config::NoDebugInfo;
33 use symbol_map::SymbolMap;
34 use util::nodemap::{NodeSet, DefIdMap, FxHashMap, FxHashSet};
36 use std::ffi::{CStr, CString};
37 use std::cell::{Cell, RefCell};
38 use std::marker::PhantomData;
44 use syntax::symbol::InternedString;
45 use syntax_pos::DUMMY_SP;
48 #[derive(Clone, Default)]
50 pub n_glues_created: Cell<usize>,
51 pub n_null_glues: Cell<usize>,
52 pub n_real_glues: Cell<usize>,
53 pub n_fns: Cell<usize>,
54 pub n_inlines: Cell<usize>,
55 pub n_closures: Cell<usize>,
56 pub n_llvm_insns: Cell<usize>,
57 pub llvm_insns: RefCell<FxHashMap<String, usize>>,
58 // (ident, llvm-instructions)
59 pub fn_stats: RefCell<Vec<(String, usize)> >,
63 pub fn extend(&mut self, stats: Stats) {
64 self.n_glues_created.set(self.n_glues_created.get() + stats.n_glues_created.get());
65 self.n_null_glues.set(self.n_null_glues.get() + stats.n_null_glues.get());
66 self.n_real_glues.set(self.n_real_glues.get() + stats.n_real_glues.get());
67 self.n_fns.set(self.n_fns.get() + stats.n_fns.get());
68 self.n_inlines.set(self.n_inlines.get() + stats.n_inlines.get());
69 self.n_closures.set(self.n_closures.get() + stats.n_closures.get());
70 self.n_llvm_insns.set(self.n_llvm_insns.get() + stats.n_llvm_insns.get());
71 self.llvm_insns.borrow_mut().extend(
72 stats.llvm_insns.borrow().iter()
73 .map(|(key, value)| (key.clone(), value.clone())));
74 self.fn_stats.borrow_mut().append(&mut *stats.fn_stats.borrow_mut());
78 /// The shared portion of a `CrateContext`. There is one `SharedCrateContext`
79 /// per crate. The data here is shared between all compilation units of the
80 /// crate, so it must not contain references to any LLVM data structures
81 /// (aside from metadata-related ones).
82 pub struct SharedCrateContext<'a, 'tcx: 'a> {
83 exported_symbols: NodeSet,
84 tcx: TyCtxt<'a, 'tcx, 'tcx>,
85 empty_param_env: ty::ParameterEnvironment<'tcx>,
88 use_dll_storage_attrs: bool,
90 translation_items: RefCell<FxHashSet<TransItem<'tcx>>>,
91 trait_cache: RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>>,
92 project_cache: RefCell<DepTrackingMap<ProjectionCache<'tcx>>>,
95 /// The local portion of a `CrateContext`. There is one `LocalCrateContext`
96 /// per compilation unit. Each one has its own LLVM `ContextRef` so that
97 /// several compilation units may be optimized in parallel. All other LLVM
98 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
99 pub struct LocalCrateContext<'tcx> {
103 codegen_unit: CodegenUnit<'tcx>,
104 needs_unwind_cleanup_cache: RefCell<FxHashMap<Ty<'tcx>, bool>>,
105 /// Cache instances of monomorphic and polymorphic items
106 instances: RefCell<FxHashMap<Instance<'tcx>, ValueRef>>,
107 /// Cache generated vtables
108 vtables: RefCell<FxHashMap<(ty::Ty<'tcx>,
109 Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>>,
110 /// Cache of constant strings,
111 const_cstr_cache: RefCell<FxHashMap<InternedString, ValueRef>>,
113 /// Reverse-direction for const ptrs cast from globals.
114 /// Key is a ValueRef holding a *T,
115 /// Val is a ValueRef holding a *[T].
117 /// Needed because LLVM loses pointer->pointee association
118 /// when we ptrcast, and we have to ptrcast during translation
119 /// of a [T] const because we form a slice, a (*T,usize) pair, not
120 /// a pointer to an LLVM array type. Similar for trait objects.
121 const_unsized: RefCell<FxHashMap<ValueRef, ValueRef>>,
123 /// Cache of emitted const globals (value -> global)
124 const_globals: RefCell<FxHashMap<ValueRef, ValueRef>>,
126 /// Cache of emitted const values
127 const_values: RefCell<FxHashMap<(ast::NodeId, &'tcx Substs<'tcx>), ValueRef>>,
129 /// Cache of external const values
130 extern_const_values: RefCell<DefIdMap<ValueRef>>,
132 /// Mapping from static definitions to their DefId's.
133 statics: RefCell<FxHashMap<ValueRef, DefId>>,
135 impl_method_cache: RefCell<FxHashMap<(DefId, ast::Name), DefId>>,
137 /// Cache of closure wrappers for bare fn's.
138 closure_bare_wrapper_cache: RefCell<FxHashMap<ValueRef, ValueRef>>,
140 /// List of globals for static variables which need to be passed to the
141 /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete.
142 /// (We have to make sure we don't invalidate any ValueRefs referring
144 statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>,
146 /// Statics that will be placed in the llvm.used variable
147 /// See http://llvm.org/docs/LangRef.html#the-llvm-used-global-variable for details
148 used_statics: RefCell<Vec<ValueRef>>,
150 lltypes: RefCell<FxHashMap<Ty<'tcx>, Type>>,
151 llsizingtypes: RefCell<FxHashMap<Ty<'tcx>, Type>>,
152 type_hashcodes: RefCell<FxHashMap<Ty<'tcx>, String>>,
154 opaque_vec_type: Type,
155 str_slice_type: Type,
157 /// Holds the LLVM values for closure IDs.
158 closure_vals: RefCell<FxHashMap<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<FxHashMap<&'static str, ValueRef>>,
168 /// Depth of the current type-of computation - used to bail out
169 type_of_depth: Cell<usize>,
171 symbol_map: Rc<SymbolMap<'tcx>>,
173 /// A counter that is used for generating local symbol names
174 local_gen_sym_counter: Cell<usize>,
177 // Implement DepTrackingMapConfig for `trait_cache`
178 pub struct TraitSelectionCache<'tcx> {
179 data: PhantomData<&'tcx ()>
182 impl<'tcx> DepTrackingMapConfig for TraitSelectionCache<'tcx> {
183 type Key = ty::PolyTraitRef<'tcx>;
184 type Value = traits::Vtable<'tcx, ()>;
185 fn to_dep_node(key: &ty::PolyTraitRef<'tcx>) -> DepNode<DefId> {
186 key.to_poly_trait_predicate().dep_node()
192 pub struct ProjectionCache<'gcx> {
193 data: PhantomData<&'gcx ()>
196 impl<'gcx> DepTrackingMapConfig for ProjectionCache<'gcx> {
198 type Value = Ty<'gcx>;
199 fn to_dep_node(key: &Self::Key) -> DepNode<DefId> {
200 // Ideally, we'd just put `key` into the dep-node, but we
201 // can't put full types in there. So just collect up all the
202 // def-ids of structs/enums as well as any traits that we
203 // project out of. It doesn't matter so much what we do here,
204 // except that if we are too coarse, we'll create overly
205 // coarse edges between impls and the trans. For example, if
206 // we just used the def-id of things we are projecting out of,
207 // then the key for `<Foo as SomeTrait>::T` and `<Bar as
208 // SomeTrait>::T` would both share a dep-node
209 // (`TraitSelect(SomeTrait)`), and hence the impls for both
210 // `Foo` and `Bar` would be considered inputs. So a change to
211 // `Bar` would affect things that just normalized `Foo`.
212 // Anyway, this heuristic is not ideal, but better than
214 let def_ids: Vec<DefId> =
216 .filter_map(|t| match t.sty {
217 ty::TyAdt(adt_def, _) => Some(adt_def.did),
218 ty::TyProjection(ref proj) => Some(proj.trait_ref.def_id),
223 DepNode::ProjectionCache { def_ids: def_ids }
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_ccx: &'a LocalCrateContext<'tcx>,
235 impl<'a, 'tcx> CrateContext<'a, 'tcx> {
236 pub fn new(shared: &'a SharedCrateContext<'a, 'tcx>,
237 local_ccx: &'a LocalCrateContext<'tcx>)
239 CrateContext { shared, local_ccx }
243 impl<'a, 'tcx> DepGraphSafe for CrateContext<'a, 'tcx> {
246 pub fn get_reloc_model(sess: &Session) -> llvm::RelocMode {
247 let reloc_model_arg = match sess.opts.cg.relocation_model {
248 Some(ref s) => &s[..],
249 None => &sess.target.target.options.relocation_model[..],
252 match ::back::write::RELOC_MODEL_ARGS.iter().find(
253 |&&arg| arg.0 == reloc_model_arg) {
256 sess.err(&format!("{:?} is not a valid relocation mode",
260 sess.abort_if_errors();
266 fn is_any_library(sess: &Session) -> bool {
267 sess.crate_types.borrow().iter().any(|ty| {
268 *ty != config::CrateTypeExecutable
272 pub fn is_pie_binary(sess: &Session) -> bool {
273 !is_any_library(sess) && get_reloc_model(sess) == llvm::RelocMode::PIC
276 pub unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
277 let llcx = llvm::LLVMContextCreate();
278 let mod_name = CString::new(mod_name).unwrap();
279 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
281 // Ensure the data-layout values hardcoded remain the defaults.
282 if sess.target.target.options.is_builtin {
283 let tm = ::back::write::create_target_machine(sess);
284 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
285 llvm::LLVMRustDisposeTargetMachine(tm);
287 let data_layout = llvm::LLVMGetDataLayout(llmod);
288 let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes())
289 .ok().expect("got a non-UTF8 data-layout from LLVM");
291 // Unfortunately LLVM target specs change over time, and right now we
292 // don't have proper support to work with any more than one
293 // `data_layout` than the one that is in the rust-lang/rust repo. If
294 // this compiler is configured against a custom LLVM, we may have a
295 // differing data layout, even though we should update our own to use
298 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
299 // disable this check entirely as we may be configured with something
300 // that has a different target layout.
302 // Unsure if this will actually cause breakage when rustc is configured
306 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
307 let custom_llvm_used = cfg_llvm_root.trim() != "";
309 if !custom_llvm_used && sess.target.target.data_layout != data_layout {
310 bug!("data-layout for builtin `{}` target, `{}`, \
311 differs from LLVM default, `{}`",
312 sess.target.target.llvm_target,
313 sess.target.target.data_layout,
318 let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap();
319 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
321 let llvm_target = sess.target.target.llvm_target.as_bytes();
322 let llvm_target = CString::new(llvm_target).unwrap();
323 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
325 if is_pie_binary(sess) {
326 llvm::LLVMRustSetModulePIELevel(llmod);
332 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
333 pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
334 exported_symbols: NodeSet,
335 check_overflow: bool)
336 -> SharedCrateContext<'b, 'tcx> {
337 // An interesting part of Windows which MSVC forces our hand on (and
338 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
339 // attributes in LLVM IR as well as native dependencies (in C these
340 // correspond to `__declspec(dllimport)`).
342 // Whenever a dynamic library is built by MSVC it must have its public
343 // interface specified by functions tagged with `dllexport` or otherwise
344 // they're not available to be linked against. This poses a few problems
345 // for the compiler, some of which are somewhat fundamental, but we use
346 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
347 // attribute to all LLVM functions that are exported e.g. they're
348 // already tagged with external linkage). This is suboptimal for a few
351 // * If an object file will never be included in a dynamic library,
352 // there's no need to attach the dllexport attribute. Most object
353 // files in Rust are not destined to become part of a dll as binaries
354 // are statically linked by default.
355 // * If the compiler is emitting both an rlib and a dylib, the same
356 // source object file is currently used but with MSVC this may be less
357 // feasible. The compiler may be able to get around this, but it may
358 // involve some invasive changes to deal with this.
360 // The flipside of this situation is that whenever you link to a dll and
361 // you import a function from it, the import should be tagged with
362 // `dllimport`. At this time, however, the compiler does not emit
363 // `dllimport` for any declarations other than constants (where it is
364 // required), which is again suboptimal for even more reasons!
366 // * Calling a function imported from another dll without using
367 // `dllimport` causes the linker/compiler to have extra overhead (one
368 // `jmp` instruction on x86) when calling the function.
369 // * The same object file may be used in different circumstances, so a
370 // function may be imported from a dll if the object is linked into a
371 // dll, but it may be just linked against if linked into an rlib.
372 // * The compiler has no knowledge about whether native functions should
373 // be tagged dllimport or not.
375 // For now the compiler takes the perf hit (I do not have any numbers to
376 // this effect) by marking very little as `dllimport` and praying the
377 // linker will take care of everything. Fixing this problem will likely
378 // require adding a few attributes to Rust itself (feature gated at the
379 // start) and then strongly recommending static linkage on MSVC!
380 let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc;
383 exported_symbols: exported_symbols,
384 empty_param_env: tcx.empty_parameter_environment(),
386 check_overflow: check_overflow,
387 use_dll_storage_attrs: use_dll_storage_attrs,
388 translation_items: RefCell::new(FxHashSet()),
389 trait_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
390 project_cache: RefCell::new(DepTrackingMap::new(tcx.dep_graph.clone())),
394 pub fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool {
395 self.tcx.type_needs_drop_given_env(ty, &self.empty_param_env)
398 pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
399 ty.is_sized(self.tcx, &self.empty_param_env, DUMMY_SP)
402 pub fn exported_symbols<'a>(&'a self) -> &'a NodeSet {
403 &self.exported_symbols
406 pub fn trait_cache(&self) -> &RefCell<DepTrackingMap<TraitSelectionCache<'tcx>>> {
410 pub fn project_cache(&self) -> &RefCell<DepTrackingMap<ProjectionCache<'tcx>>> {
414 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
418 pub fn sess<'a>(&'a self) -> &'a Session {
422 pub fn dep_graph<'a>(&'a self) -> &'a DepGraph {
426 pub fn use_dll_storage_attrs(&self) -> bool {
427 self.use_dll_storage_attrs
430 pub fn translation_items(&self) -> &RefCell<FxHashSet<TransItem<'tcx>>> {
431 &self.translation_items
435 impl<'tcx> LocalCrateContext<'tcx> {
436 pub fn new<'a>(shared: &SharedCrateContext<'a, 'tcx>,
437 codegen_unit: CodegenUnit<'tcx>,
438 symbol_map: Rc<SymbolMap<'tcx>>)
439 -> LocalCrateContext<'tcx> {
441 // Append ".rs" to LLVM module identifier.
443 // LLVM code generator emits a ".file filename" directive
444 // for ELF backends. Value of the "filename" is set as the
445 // LLVM module identifier. Due to a LLVM MC bug[1], LLVM
446 // crashes if the module identifier is same as other symbols
447 // such as a function name in the module.
448 // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
449 let llmod_id = format!("{}.rs", codegen_unit.name());
451 let (llcx, llmod) = create_context_and_module(&shared.tcx.sess,
454 let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
455 let dctx = debuginfo::CrateDebugContext::new(llmod);
456 debuginfo::metadata::compile_unit_metadata(shared, &dctx, shared.tcx.sess);
462 let local_ccx = LocalCrateContext {
465 stats: Stats::default(),
466 codegen_unit: codegen_unit,
467 needs_unwind_cleanup_cache: RefCell::new(FxHashMap()),
468 instances: RefCell::new(FxHashMap()),
469 vtables: RefCell::new(FxHashMap()),
470 const_cstr_cache: RefCell::new(FxHashMap()),
471 const_unsized: RefCell::new(FxHashMap()),
472 const_globals: RefCell::new(FxHashMap()),
473 const_values: RefCell::new(FxHashMap()),
474 extern_const_values: RefCell::new(DefIdMap()),
475 statics: RefCell::new(FxHashMap()),
476 impl_method_cache: RefCell::new(FxHashMap()),
477 closure_bare_wrapper_cache: RefCell::new(FxHashMap()),
478 statics_to_rauw: RefCell::new(Vec::new()),
479 used_statics: RefCell::new(Vec::new()),
480 lltypes: RefCell::new(FxHashMap()),
481 llsizingtypes: RefCell::new(FxHashMap()),
482 type_hashcodes: RefCell::new(FxHashMap()),
483 int_type: Type::from_ref(ptr::null_mut()),
484 opaque_vec_type: Type::from_ref(ptr::null_mut()),
485 str_slice_type: Type::from_ref(ptr::null_mut()),
486 closure_vals: RefCell::new(FxHashMap()),
488 eh_personality: Cell::new(None),
489 eh_unwind_resume: Cell::new(None),
490 rust_try_fn: Cell::new(None),
491 intrinsics: RefCell::new(FxHashMap()),
492 type_of_depth: Cell::new(0),
493 symbol_map: symbol_map,
494 local_gen_sym_counter: Cell::new(0),
497 let (int_type, opaque_vec_type, str_slice_ty, mut local_ccx) = {
498 // Do a little dance to create a dummy CrateContext, so we can
499 // create some things in the LLVM module of this codegen unit
500 let mut local_ccxs = vec![local_ccx];
501 let (int_type, opaque_vec_type, str_slice_ty) = {
502 let dummy_ccx = LocalCrateContext::dummy_ccx(shared,
503 local_ccxs.as_mut_slice());
504 let mut str_slice_ty = Type::named_struct(&dummy_ccx, "str_slice");
505 str_slice_ty.set_struct_body(&[Type::i8p(&dummy_ccx),
506 Type::int(&dummy_ccx)],
508 (Type::int(&dummy_ccx), Type::opaque_vec(&dummy_ccx), str_slice_ty)
510 (int_type, opaque_vec_type, str_slice_ty, local_ccxs.pop().unwrap())
513 local_ccx.int_type = int_type;
514 local_ccx.opaque_vec_type = opaque_vec_type;
515 local_ccx.str_slice_type = str_slice_ty;
521 /// Create a dummy `CrateContext` from `self` and the provided
522 /// `SharedCrateContext`. This is somewhat dangerous because `self` may
523 /// not be fully initialized.
525 /// This is used in the `LocalCrateContext` constructor to allow calling
526 /// functions that expect a complete `CrateContext`, even before the local
527 /// portion is fully initialized and attached to the `SharedCrateContext`.
528 fn dummy_ccx<'a>(shared: &'a SharedCrateContext<'a, 'tcx>,
529 local_ccxs: &'a [LocalCrateContext<'tcx>])
530 -> CrateContext<'a, 'tcx> {
531 assert!(local_ccxs.len() == 1);
534 local_ccx: &local_ccxs[0]
538 pub fn into_stats(self) -> Stats {
543 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
544 pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> {
548 fn local(&self) -> &'b LocalCrateContext<'tcx> {
552 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
556 pub fn sess<'a>(&'a self) -> &'a Session {
557 &self.shared.tcx.sess
560 pub fn get_intrinsic(&self, key: &str) -> ValueRef {
561 if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
564 match declare_intrinsic(self, key) {
566 None => bug!("unknown intrinsic '{}'", key)
570 pub fn llmod(&self) -> ModuleRef {
574 pub fn llcx(&self) -> ContextRef {
578 pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> {
579 &self.local().codegen_unit
582 pub fn td(&self) -> llvm::TargetDataRef {
583 unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
586 pub fn needs_unwind_cleanup_cache(&self) -> &RefCell<FxHashMap<Ty<'tcx>, bool>> {
587 &self.local().needs_unwind_cleanup_cache
590 pub fn instances<'a>(&'a self) -> &'a RefCell<FxHashMap<Instance<'tcx>, ValueRef>> {
591 &self.local().instances
594 pub fn vtables<'a>(&'a self)
595 -> &'a RefCell<FxHashMap<(ty::Ty<'tcx>,
596 Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>> {
597 &self.local().vtables
600 pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FxHashMap<InternedString, ValueRef>> {
601 &self.local().const_cstr_cache
604 pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
605 &self.local().const_unsized
608 pub fn const_globals<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
609 &self.local().const_globals
612 pub fn const_values<'a>(&'a self) -> &'a RefCell<FxHashMap<(ast::NodeId, &'tcx Substs<'tcx>),
614 &self.local().const_values
617 pub fn extern_const_values<'a>(&'a self) -> &'a RefCell<DefIdMap<ValueRef>> {
618 &self.local().extern_const_values
621 pub fn statics<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, DefId>> {
622 &self.local().statics
625 pub fn impl_method_cache<'a>(&'a self)
626 -> &'a RefCell<FxHashMap<(DefId, ast::Name), DefId>> {
627 &self.local().impl_method_cache
630 pub fn closure_bare_wrapper_cache<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
631 &self.local().closure_bare_wrapper_cache
634 pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> {
635 &self.local().statics_to_rauw
638 pub fn used_statics<'a>(&'a self) -> &'a RefCell<Vec<ValueRef>> {
639 &self.local().used_statics
642 pub fn lltypes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, Type>> {
643 &self.local().lltypes
646 pub fn llsizingtypes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, Type>> {
647 &self.local().llsizingtypes
650 pub fn type_hashcodes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, String>> {
651 &self.local().type_hashcodes
654 pub fn stats<'a>(&'a self) -> &'a Stats {
658 pub fn int_type(&self) -> Type {
659 self.local().int_type
662 pub fn opaque_vec_type(&self) -> Type {
663 self.local().opaque_vec_type
666 pub fn str_slice_type(&self) -> Type {
667 self.local().str_slice_type
670 pub fn closure_vals<'a>(&'a self) -> &'a RefCell<FxHashMap<Instance<'tcx>, ValueRef>> {
671 &self.local().closure_vals
674 pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
678 pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
679 &self.local().rust_try_fn
682 fn intrinsics<'a>(&'a self) -> &'a RefCell<FxHashMap<&'static str, ValueRef>> {
683 &self.local().intrinsics
686 pub fn obj_size_bound(&self) -> u64 {
687 self.tcx().data_layout.obj_size_bound()
690 pub fn report_overbig_object(&self, obj: Ty<'tcx>) -> ! {
692 &format!("the type `{:?}` is too big for the current architecture",
696 pub fn enter_type_of(&self, ty: Ty<'tcx>) -> TypeOfDepthLock<'b, 'tcx> {
697 let current_depth = self.local().type_of_depth.get();
698 debug!("enter_type_of({:?}) at depth {:?}", ty, current_depth);
699 if current_depth > self.sess().recursion_limit.get() {
701 &format!("overflow representing the type `{}`", ty))
703 self.local().type_of_depth.set(current_depth + 1);
704 TypeOfDepthLock(self.local())
707 pub fn check_overflow(&self) -> bool {
708 self.shared.check_overflow
711 pub fn use_dll_storage_attrs(&self) -> bool {
712 self.shared.use_dll_storage_attrs()
715 pub fn symbol_map(&self) -> &SymbolMap<'tcx> {
716 &*self.local().symbol_map
719 pub fn translation_items(&self) -> &RefCell<FxHashSet<TransItem<'tcx>>> {
720 &self.shared.translation_items
723 /// Given the def-id of some item that has no type parameters, make
724 /// a suitable "empty substs" for it.
725 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
726 self.tcx().empty_substs_for_def_id(item_def_id)
729 /// Generate a new symbol name with the given prefix. This symbol name must
730 /// only be used for definitions with `internal` or `private` linkage.
731 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
732 let idx = self.local().local_gen_sym_counter.get();
733 self.local().local_gen_sym_counter.set(idx + 1);
734 // Include a '.' character, so there can be no accidental conflicts with
735 // user defined names
736 let mut name = String::with_capacity(prefix.len() + 6);
737 name.push_str(prefix);
739 base_n::push_str(idx as u64, base_n::ALPHANUMERIC_ONLY, &mut name);
743 pub fn eh_personality(&self) -> ValueRef {
744 // The exception handling personality function.
746 // If our compilation unit has the `eh_personality` lang item somewhere
747 // within it, then we just need to translate that. Otherwise, we're
748 // building an rlib which will depend on some upstream implementation of
749 // this function, so we just codegen a generic reference to it. We don't
750 // specify any of the types for the function, we just make it a symbol
751 // that LLVM can later use.
753 // Note that MSVC is a little special here in that we don't use the
754 // `eh_personality` lang item at all. Currently LLVM has support for
755 // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
756 // *name of the personality function* to decide what kind of unwind side
757 // tables/landing pads to emit. It looks like Dwarf is used by default,
758 // injecting a dependency on the `_Unwind_Resume` symbol for resuming
759 // an "exception", but for MSVC we want to force SEH. This means that we
760 // can't actually have the personality function be our standard
761 // `rust_eh_personality` function, but rather we wired it up to the
762 // CRT's custom personality function, which forces LLVM to consider
763 // landing pads as "landing pads for SEH".
764 if let Some(llpersonality) = self.local().eh_personality.get() {
767 let tcx = self.tcx();
768 let llfn = match tcx.lang_items.eh_personality() {
769 Some(def_id) if !base::wants_msvc_seh(self.sess()) => {
770 callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]))
773 let name = if base::wants_msvc_seh(self.sess()) {
776 "rust_eh_personality"
778 let fty = Type::variadic_func(&[], &Type::i32(self));
779 declare::declare_cfn(self, name, fty)
782 self.local().eh_personality.set(Some(llfn));
786 // Returns a ValueRef of the "eh_unwind_resume" lang item if one is defined,
787 // otherwise declares it as an external function.
788 pub fn eh_unwind_resume(&self) -> ValueRef {
790 let unwresume = &self.local().eh_unwind_resume;
791 if let Some(llfn) = unwresume.get() {
795 let tcx = self.tcx();
796 assert!(self.sess().target.target.options.custom_unwind_resume);
797 if let Some(def_id) = tcx.lang_items.eh_unwind_resume() {
798 let llfn = callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]));
799 unwresume.set(Some(llfn));
803 let ty = tcx.mk_fn_ptr(ty::Binder(tcx.mk_fn_sig(
804 iter::once(tcx.mk_mut_ptr(tcx.types.u8)),
807 hir::Unsafety::Unsafe,
811 let llfn = declare::declare_fn(self, "rust_eh_unwind_resume", ty);
812 attributes::unwind(llfn, true);
813 unwresume.set(Some(llfn));
818 impl<'a, 'tcx> ty::layout::HasDataLayout for &'a SharedCrateContext<'a, 'tcx> {
819 fn data_layout(&self) -> &ty::layout::TargetDataLayout {
820 &self.tcx.data_layout
824 impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
825 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
830 impl<'a, 'tcx> ty::layout::HasDataLayout for &'a CrateContext<'a, 'tcx> {
831 fn data_layout(&self) -> &ty::layout::TargetDataLayout {
832 &self.shared.tcx.data_layout
836 impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a CrateContext<'a, 'tcx> {
837 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
842 impl<'a, 'tcx> LayoutTyper<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
843 type TyLayout = TyLayout<'tcx>;
845 fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
846 self.tcx().infer_ctxt((), traits::Reveal::All).enter(|infcx| {
847 infcx.layout_of(ty).unwrap_or_else(|e| {
849 ty::layout::LayoutError::SizeOverflow(_) =>
850 self.sess().fatal(&e.to_string()),
851 _ => bug!("failed to get layout for `{}`: {}", ty, e)
858 impl<'a, 'tcx> LayoutTyper<'tcx> for &'a CrateContext<'a, 'tcx> {
859 type TyLayout = TyLayout<'tcx>;
861 fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
862 self.shared.layout_of(ty)
866 pub struct TypeOfDepthLock<'a, 'tcx: 'a>(&'a LocalCrateContext<'tcx>);
868 impl<'a, 'tcx> Drop for TypeOfDepthLock<'a, 'tcx> {
870 self.0.type_of_depth.set(self.0.type_of_depth.get() - 1);
874 /// Declare any llvm intrinsics that you might need
875 fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> {
877 ($name:expr, fn() -> $ret:expr) => (
879 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret));
880 llvm::SetUnnamedAddr(f, false);
881 ccx.intrinsics().borrow_mut().insert($name, f.clone());
885 ($name:expr, fn(...) -> $ret:expr) => (
887 let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret));
888 llvm::SetUnnamedAddr(f, false);
889 ccx.intrinsics().borrow_mut().insert($name, f.clone());
893 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
895 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret));
896 llvm::SetUnnamedAddr(f, false);
897 ccx.intrinsics().borrow_mut().insert($name, f.clone());
902 macro_rules! mk_struct {
903 ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
906 let i8p = Type::i8p(ccx);
907 let void = Type::void(ccx);
908 let i1 = Type::i1(ccx);
909 let t_i8 = Type::i8(ccx);
910 let t_i16 = Type::i16(ccx);
911 let t_i32 = Type::i32(ccx);
912 let t_i64 = Type::i64(ccx);
913 let t_i128 = Type::i128(ccx);
914 let t_f32 = Type::f32(ccx);
915 let t_f64 = Type::f64(ccx);
917 ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
918 ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
919 ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
920 ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
921 ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
922 ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
923 ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
924 ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
925 ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
927 ifn!("llvm.trap", fn() -> void);
928 ifn!("llvm.debugtrap", fn() -> void);
929 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
931 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
932 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
933 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
934 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
936 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
937 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
938 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
939 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
940 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
941 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
942 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
943 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
944 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
945 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
946 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
947 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
948 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
949 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
950 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
951 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
953 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
954 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
956 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
957 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
959 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
960 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
961 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
962 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
963 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
964 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
966 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
967 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
968 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
969 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
971 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
972 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
973 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
974 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
976 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
977 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
978 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
979 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
980 ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128);
982 ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
983 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
984 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
985 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
986 ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128);
988 ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
989 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
990 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
991 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
992 ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128);
994 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
995 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
996 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
997 ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128);
999 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1000 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1001 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1002 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1003 ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
1005 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1006 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1007 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1008 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1009 ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
1011 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1012 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1013 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1014 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1015 ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
1017 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1018 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1019 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1020 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1021 ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
1023 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1024 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1025 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1026 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1027 ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
1029 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
1030 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
1031 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
1032 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
1033 ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
1035 ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
1036 ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
1038 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
1039 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
1040 ifn!("llvm.localescape", fn(...) -> void);
1041 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
1042 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
1044 ifn!("llvm.assume", fn(i1) -> void);
1046 if ccx.sess().opts.debuginfo != NoDebugInfo {
1047 ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
1048 ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);