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};
15 use rustc::hir::def_id::DefId;
19 use back::symbol_export::ExportedSymbols;
22 use monomorphize::Instance;
24 use partitioning::CodegenUnit;
25 use trans_item::TransItem;
27 use rustc_data_structures::base_n;
28 use rustc::session::config::{self, NoDebugInfo, OutputFilenames};
29 use rustc::session::Session;
30 use rustc::ty::{self, Ty, TyCtxt};
31 use rustc::ty::layout::{LayoutCx, LayoutError, LayoutTyper, TyLayout};
32 use rustc::util::nodemap::{FxHashMap, FxHashSet};
34 use std::ffi::{CStr, CString};
35 use std::cell::{Cell, RefCell};
40 use std::marker::PhantomData;
41 use syntax::symbol::InternedString;
42 use syntax_pos::DUMMY_SP;
45 #[derive(Clone, Default)]
47 pub n_glues_created: Cell<usize>,
48 pub n_null_glues: Cell<usize>,
49 pub n_real_glues: Cell<usize>,
50 pub n_fns: Cell<usize>,
51 pub n_inlines: Cell<usize>,
52 pub n_closures: Cell<usize>,
53 pub n_llvm_insns: Cell<usize>,
54 pub llvm_insns: RefCell<FxHashMap<String, usize>>,
55 // (ident, llvm-instructions)
56 pub fn_stats: RefCell<Vec<(String, usize)> >,
60 pub fn extend(&mut self, stats: Stats) {
61 self.n_glues_created.set(self.n_glues_created.get() + stats.n_glues_created.get());
62 self.n_null_glues.set(self.n_null_glues.get() + stats.n_null_glues.get());
63 self.n_real_glues.set(self.n_real_glues.get() + stats.n_real_glues.get());
64 self.n_fns.set(self.n_fns.get() + stats.n_fns.get());
65 self.n_inlines.set(self.n_inlines.get() + stats.n_inlines.get());
66 self.n_closures.set(self.n_closures.get() + stats.n_closures.get());
67 self.n_llvm_insns.set(self.n_llvm_insns.get() + stats.n_llvm_insns.get());
68 self.llvm_insns.borrow_mut().extend(
69 stats.llvm_insns.borrow().iter()
70 .map(|(key, value)| (key.clone(), value.clone())));
71 self.fn_stats.borrow_mut().append(&mut *stats.fn_stats.borrow_mut());
75 /// The shared portion of a `CrateContext`. There is one `SharedCrateContext`
76 /// per crate. The data here is shared between all compilation units of the
77 /// crate, so it must not contain references to any LLVM data structures
78 /// (aside from metadata-related ones).
79 pub struct SharedCrateContext<'a, 'tcx: 'a> {
80 tcx: TyCtxt<'a, 'tcx, 'tcx>,
83 use_dll_storage_attrs: bool,
85 output_filenames: &'a OutputFilenames,
88 /// The local portion of a `CrateContext`. There is one `LocalCrateContext`
89 /// per compilation unit. Each one has its own LLVM `ContextRef` so that
90 /// several compilation units may be optimized in parallel. All other LLVM
91 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
92 pub struct LocalCrateContext<'a, 'tcx: 'a> {
96 codegen_unit: CodegenUnit<'tcx>,
98 /// The translation items of the whole crate.
99 crate_trans_items: Arc<FxHashSet<TransItem<'tcx>>>,
101 /// Information about which symbols are exported from the crate.
102 exported_symbols: Arc<ExportedSymbols>,
104 /// Cache instances of monomorphic and polymorphic items
105 instances: RefCell<FxHashMap<Instance<'tcx>, ValueRef>>,
106 /// Cache generated vtables
107 vtables: RefCell<FxHashMap<(Ty<'tcx>,
108 Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>>,
109 /// Cache of constant strings,
110 const_cstr_cache: RefCell<FxHashMap<InternedString, ValueRef>>,
112 /// Reverse-direction for const ptrs cast from globals.
113 /// Key is a ValueRef holding a *T,
114 /// Val is a ValueRef holding a *[T].
116 /// Needed because LLVM loses pointer->pointee association
117 /// when we ptrcast, and we have to ptrcast during translation
118 /// of a [T] const because we form a slice, a (*T,usize) pair, not
119 /// a pointer to an LLVM array type. Similar for trait objects.
120 const_unsized: RefCell<FxHashMap<ValueRef, ValueRef>>,
122 /// Cache of emitted const globals (value -> global)
123 const_globals: RefCell<FxHashMap<ValueRef, ValueRef>>,
125 /// Mapping from static definitions to their DefId's.
126 statics: RefCell<FxHashMap<ValueRef, DefId>>,
128 /// List of globals for static variables which need to be passed to the
129 /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete.
130 /// (We have to make sure we don't invalidate any ValueRefs referring
132 statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>,
134 /// Statics that will be placed in the llvm.used variable
135 /// See http://llvm.org/docs/LangRef.html#the-llvm-used-global-variable for details
136 used_statics: RefCell<Vec<ValueRef>>,
138 lltypes: RefCell<FxHashMap<Ty<'tcx>, Type>>,
140 opaque_vec_type: Type,
141 str_slice_type: Type,
143 dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>,
145 eh_personality: Cell<Option<ValueRef>>,
146 eh_unwind_resume: Cell<Option<ValueRef>>,
147 rust_try_fn: Cell<Option<ValueRef>>,
149 intrinsics: RefCell<FxHashMap<&'static str, ValueRef>>,
151 /// A counter that is used for generating local symbol names
152 local_gen_sym_counter: Cell<usize>,
154 /// A placeholder so we can add lifetimes
155 placeholder: PhantomData<&'a ()>,
158 /// A CrateContext value binds together one LocalCrateContext with the
159 /// SharedCrateContext. It exists as a convenience wrapper, so we don't have to
160 /// pass around (SharedCrateContext, LocalCrateContext) tuples all over trans.
161 pub struct CrateContext<'a, 'tcx: 'a> {
162 shared: &'a SharedCrateContext<'a, 'tcx>,
163 local_ccx: &'a LocalCrateContext<'a, 'tcx>,
166 impl<'a, 'tcx> CrateContext<'a, 'tcx> {
167 pub fn new(shared: &'a SharedCrateContext<'a, 'tcx>,
168 local_ccx: &'a LocalCrateContext<'a, 'tcx>)
170 CrateContext { shared, local_ccx }
174 impl<'a, 'tcx> DepGraphSafe for CrateContext<'a, 'tcx> {
177 pub fn get_reloc_model(sess: &Session) -> llvm::RelocMode {
178 let reloc_model_arg = match sess.opts.cg.relocation_model {
179 Some(ref s) => &s[..],
180 None => &sess.target.target.options.relocation_model[..],
183 match ::back::write::RELOC_MODEL_ARGS.iter().find(
184 |&&arg| arg.0 == reloc_model_arg) {
187 sess.err(&format!("{:?} is not a valid relocation mode",
191 sess.abort_if_errors();
197 fn is_any_library(sess: &Session) -> bool {
198 sess.crate_types.borrow().iter().any(|ty| {
199 *ty != config::CrateTypeExecutable
203 pub fn is_pie_binary(sess: &Session) -> bool {
204 !is_any_library(sess) && get_reloc_model(sess) == llvm::RelocMode::PIC
207 pub unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
208 let llcx = llvm::LLVMContextCreate();
209 let mod_name = CString::new(mod_name).unwrap();
210 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
212 // Ensure the data-layout values hardcoded remain the defaults.
213 if sess.target.target.options.is_builtin {
214 let tm = ::back::write::create_target_machine(sess);
215 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
216 llvm::LLVMRustDisposeTargetMachine(tm);
218 let data_layout = llvm::LLVMGetDataLayout(llmod);
219 let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes())
220 .ok().expect("got a non-UTF8 data-layout from LLVM");
222 // Unfortunately LLVM target specs change over time, and right now we
223 // don't have proper support to work with any more than one
224 // `data_layout` than the one that is in the rust-lang/rust repo. If
225 // this compiler is configured against a custom LLVM, we may have a
226 // differing data layout, even though we should update our own to use
229 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
230 // disable this check entirely as we may be configured with something
231 // that has a different target layout.
233 // Unsure if this will actually cause breakage when rustc is configured
237 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
238 let custom_llvm_used = cfg_llvm_root.trim() != "";
240 if !custom_llvm_used && sess.target.target.data_layout != data_layout {
241 bug!("data-layout for builtin `{}` target, `{}`, \
242 differs from LLVM default, `{}`",
243 sess.target.target.llvm_target,
244 sess.target.target.data_layout,
249 let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap();
250 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
252 let llvm_target = sess.target.target.llvm_target.as_bytes();
253 let llvm_target = CString::new(llvm_target).unwrap();
254 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
256 if is_pie_binary(sess) {
257 llvm::LLVMRustSetModulePIELevel(llmod);
263 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
264 pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
265 check_overflow: bool,
266 output_filenames: &'b OutputFilenames)
267 -> SharedCrateContext<'b, 'tcx> {
268 // An interesting part of Windows which MSVC forces our hand on (and
269 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
270 // attributes in LLVM IR as well as native dependencies (in C these
271 // correspond to `__declspec(dllimport)`).
273 // Whenever a dynamic library is built by MSVC it must have its public
274 // interface specified by functions tagged with `dllexport` or otherwise
275 // they're not available to be linked against. This poses a few problems
276 // for the compiler, some of which are somewhat fundamental, but we use
277 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
278 // attribute to all LLVM functions that are exported e.g. they're
279 // already tagged with external linkage). This is suboptimal for a few
282 // * If an object file will never be included in a dynamic library,
283 // there's no need to attach the dllexport attribute. Most object
284 // files in Rust are not destined to become part of a dll as binaries
285 // are statically linked by default.
286 // * If the compiler is emitting both an rlib and a dylib, the same
287 // source object file is currently used but with MSVC this may be less
288 // feasible. The compiler may be able to get around this, but it may
289 // involve some invasive changes to deal with this.
291 // The flipside of this situation is that whenever you link to a dll and
292 // you import a function from it, the import should be tagged with
293 // `dllimport`. At this time, however, the compiler does not emit
294 // `dllimport` for any declarations other than constants (where it is
295 // required), which is again suboptimal for even more reasons!
297 // * Calling a function imported from another dll without using
298 // `dllimport` causes the linker/compiler to have extra overhead (one
299 // `jmp` instruction on x86) when calling the function.
300 // * The same object file may be used in different circumstances, so a
301 // function may be imported from a dll if the object is linked into a
302 // dll, but it may be just linked against if linked into an rlib.
303 // * The compiler has no knowledge about whether native functions should
304 // be tagged dllimport or not.
306 // For now the compiler takes the perf hit (I do not have any numbers to
307 // this effect) by marking very little as `dllimport` and praying the
308 // linker will take care of everything. Fixing this problem will likely
309 // require adding a few attributes to Rust itself (feature gated at the
310 // start) and then strongly recommending static linkage on MSVC!
311 let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc;
316 use_dll_storage_attrs,
321 pub fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool {
322 ty.needs_drop(self.tcx, ty::ParamEnv::empty(traits::Reveal::All))
325 pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
326 ty.is_sized(self.tcx, ty::ParamEnv::empty(traits::Reveal::All), DUMMY_SP)
329 pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
330 ty.is_freeze(self.tcx, ty::ParamEnv::empty(traits::Reveal::All), DUMMY_SP)
333 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
337 pub fn sess<'a>(&'a self) -> &'a Session {
341 pub fn dep_graph<'a>(&'a self) -> &'a DepGraph {
345 pub fn use_dll_storage_attrs(&self) -> bool {
346 self.use_dll_storage_attrs
349 pub fn output_filenames(&self) -> &OutputFilenames {
350 self.output_filenames
354 impl<'a, 'tcx> LocalCrateContext<'a, 'tcx> {
355 pub fn new(shared: &SharedCrateContext<'a, 'tcx>,
356 codegen_unit: CodegenUnit<'tcx>,
357 crate_trans_items: Arc<FxHashSet<TransItem<'tcx>>>,
358 exported_symbols: Arc<ExportedSymbols>,)
359 -> LocalCrateContext<'a, 'tcx> {
361 // Append ".rs" to LLVM module identifier.
363 // LLVM code generator emits a ".file filename" directive
364 // for ELF backends. Value of the "filename" is set as the
365 // LLVM module identifier. Due to a LLVM MC bug[1], LLVM
366 // crashes if the module identifier is same as other symbols
367 // such as a function name in the module.
368 // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
369 let llmod_id = format!("{}.rs", codegen_unit.name());
371 let (llcx, llmod) = create_context_and_module(&shared.tcx.sess,
374 let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
375 let dctx = debuginfo::CrateDebugContext::new(llmod);
376 debuginfo::metadata::compile_unit_metadata(shared,
385 let local_ccx = LocalCrateContext {
388 stats: Stats::default(),
392 instances: RefCell::new(FxHashMap()),
393 vtables: RefCell::new(FxHashMap()),
394 const_cstr_cache: RefCell::new(FxHashMap()),
395 const_unsized: RefCell::new(FxHashMap()),
396 const_globals: RefCell::new(FxHashMap()),
397 statics: RefCell::new(FxHashMap()),
398 statics_to_rauw: RefCell::new(Vec::new()),
399 used_statics: RefCell::new(Vec::new()),
400 lltypes: RefCell::new(FxHashMap()),
401 isize_ty: Type::from_ref(ptr::null_mut()),
402 opaque_vec_type: Type::from_ref(ptr::null_mut()),
403 str_slice_type: Type::from_ref(ptr::null_mut()),
405 eh_personality: Cell::new(None),
406 eh_unwind_resume: Cell::new(None),
407 rust_try_fn: Cell::new(None),
408 intrinsics: RefCell::new(FxHashMap()),
409 local_gen_sym_counter: Cell::new(0),
410 placeholder: PhantomData,
413 let (isize_ty, opaque_vec_type, str_slice_ty, mut local_ccx) = {
414 // Do a little dance to create a dummy CrateContext, so we can
415 // create some things in the LLVM module of this codegen unit
416 let mut local_ccxs = vec![local_ccx];
417 let (isize_ty, opaque_vec_type, str_slice_ty) = {
418 let dummy_ccx = LocalCrateContext::dummy_ccx(shared,
419 local_ccxs.as_mut_slice());
420 let mut str_slice_ty = Type::named_struct(&dummy_ccx, "str_slice");
421 str_slice_ty.set_struct_body(&[Type::i8p(&dummy_ccx),
422 Type::isize(&dummy_ccx)],
424 (Type::isize(&dummy_ccx), Type::opaque_vec(&dummy_ccx), str_slice_ty)
426 (isize_ty, opaque_vec_type, str_slice_ty, local_ccxs.pop().unwrap())
429 local_ccx.isize_ty = isize_ty;
430 local_ccx.opaque_vec_type = opaque_vec_type;
431 local_ccx.str_slice_type = str_slice_ty;
437 /// Create a dummy `CrateContext` from `self` and the provided
438 /// `SharedCrateContext`. This is somewhat dangerous because `self` may
439 /// not be fully initialized.
441 /// This is used in the `LocalCrateContext` constructor to allow calling
442 /// functions that expect a complete `CrateContext`, even before the local
443 /// portion is fully initialized and attached to the `SharedCrateContext`.
444 fn dummy_ccx(shared: &'a SharedCrateContext<'a, 'tcx>,
445 local_ccxs: &'a [LocalCrateContext<'a, 'tcx>])
446 -> CrateContext<'a, 'tcx> {
447 assert!(local_ccxs.len() == 1);
450 local_ccx: &local_ccxs[0]
454 pub fn into_stats(self) -> Stats {
459 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
460 pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> {
464 fn local(&self) -> &'b LocalCrateContext<'b, 'tcx> {
468 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
472 pub fn sess<'a>(&'a self) -> &'a Session {
473 &self.shared.tcx.sess
476 pub fn get_intrinsic(&self, key: &str) -> ValueRef {
477 if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
480 match declare_intrinsic(self, key) {
482 None => bug!("unknown intrinsic '{}'", key)
486 pub fn llmod(&self) -> ModuleRef {
490 pub fn llcx(&self) -> ContextRef {
494 pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> {
495 &self.local().codegen_unit
498 pub fn crate_trans_items(&self) -> &FxHashSet<TransItem<'tcx>> {
499 &self.local().crate_trans_items
502 pub fn exported_symbols(&self) -> &ExportedSymbols {
503 &self.local().exported_symbols
506 pub fn td(&self) -> llvm::TargetDataRef {
507 unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
510 pub fn instances<'a>(&'a self) -> &'a RefCell<FxHashMap<Instance<'tcx>, ValueRef>> {
511 &self.local().instances
514 pub fn vtables<'a>(&'a self)
515 -> &'a RefCell<FxHashMap<(Ty<'tcx>,
516 Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>> {
517 &self.local().vtables
520 pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FxHashMap<InternedString, ValueRef>> {
521 &self.local().const_cstr_cache
524 pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
525 &self.local().const_unsized
528 pub fn const_globals<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
529 &self.local().const_globals
532 pub fn statics<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, DefId>> {
533 &self.local().statics
536 pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> {
537 &self.local().statics_to_rauw
540 pub fn used_statics<'a>(&'a self) -> &'a RefCell<Vec<ValueRef>> {
541 &self.local().used_statics
544 pub fn lltypes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, Type>> {
545 &self.local().lltypes
548 pub fn stats<'a>(&'a self) -> &'a Stats {
552 pub fn isize_ty(&self) -> Type {
553 self.local().isize_ty
556 pub fn str_slice_type(&self) -> Type {
557 self.local().str_slice_type
560 pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
564 pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
565 &self.local().rust_try_fn
568 fn intrinsics<'a>(&'a self) -> &'a RefCell<FxHashMap<&'static str, ValueRef>> {
569 &self.local().intrinsics
572 pub fn check_overflow(&self) -> bool {
573 self.shared.check_overflow
576 pub fn use_dll_storage_attrs(&self) -> bool {
577 self.shared.use_dll_storage_attrs()
580 /// Generate a new symbol name with the given prefix. This symbol name must
581 /// only be used for definitions with `internal` or `private` linkage.
582 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
583 let idx = self.local().local_gen_sym_counter.get();
584 self.local().local_gen_sym_counter.set(idx + 1);
585 // Include a '.' character, so there can be no accidental conflicts with
586 // user defined names
587 let mut name = String::with_capacity(prefix.len() + 6);
588 name.push_str(prefix);
590 base_n::push_str(idx as u64, base_n::ALPHANUMERIC_ONLY, &mut name);
594 pub fn eh_personality(&self) -> ValueRef {
595 // The exception handling personality function.
597 // If our compilation unit has the `eh_personality` lang item somewhere
598 // within it, then we just need to translate that. Otherwise, we're
599 // building an rlib which will depend on some upstream implementation of
600 // this function, so we just codegen a generic reference to it. We don't
601 // specify any of the types for the function, we just make it a symbol
602 // that LLVM can later use.
604 // Note that MSVC is a little special here in that we don't use the
605 // `eh_personality` lang item at all. Currently LLVM has support for
606 // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
607 // *name of the personality function* to decide what kind of unwind side
608 // tables/landing pads to emit. It looks like Dwarf is used by default,
609 // injecting a dependency on the `_Unwind_Resume` symbol for resuming
610 // an "exception", but for MSVC we want to force SEH. This means that we
611 // can't actually have the personality function be our standard
612 // `rust_eh_personality` function, but rather we wired it up to the
613 // CRT's custom personality function, which forces LLVM to consider
614 // landing pads as "landing pads for SEH".
615 if let Some(llpersonality) = self.local().eh_personality.get() {
618 let tcx = self.tcx();
619 let llfn = match tcx.lang_items().eh_personality() {
620 Some(def_id) if !base::wants_msvc_seh(self.sess()) => {
621 callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]))
624 let name = if base::wants_msvc_seh(self.sess()) {
627 "rust_eh_personality"
629 let fty = Type::variadic_func(&[], &Type::i32(self));
630 declare::declare_cfn(self, name, fty)
633 self.local().eh_personality.set(Some(llfn));
637 // Returns a ValueRef of the "eh_unwind_resume" lang item if one is defined,
638 // otherwise declares it as an external function.
639 pub fn eh_unwind_resume(&self) -> ValueRef {
641 let unwresume = &self.local().eh_unwind_resume;
642 if let Some(llfn) = unwresume.get() {
646 let tcx = self.tcx();
647 assert!(self.sess().target.target.options.custom_unwind_resume);
648 if let Some(def_id) = tcx.lang_items().eh_unwind_resume() {
649 let llfn = callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]));
650 unwresume.set(Some(llfn));
654 let ty = tcx.mk_fn_ptr(ty::Binder(tcx.mk_fn_sig(
655 iter::once(tcx.mk_mut_ptr(tcx.types.u8)),
658 hir::Unsafety::Unsafe,
662 let llfn = declare::declare_fn(self, "rust_eh_unwind_resume", ty);
663 attributes::unwind(llfn, true);
664 unwresume.set(Some(llfn));
669 impl<'a, 'tcx> ty::layout::HasDataLayout for &'a SharedCrateContext<'a, 'tcx> {
670 fn data_layout(&self) -> &ty::layout::TargetDataLayout {
671 &self.tcx.data_layout
675 impl<'a, 'tcx> ty::layout::HasDataLayout for &'a CrateContext<'a, 'tcx> {
676 fn data_layout(&self) -> &ty::layout::TargetDataLayout {
677 &self.shared.tcx.data_layout
681 impl<'a, 'tcx> LayoutTyper<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
682 type TyLayout = TyLayout<'tcx>;
684 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
688 fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
689 let param_env = ty::ParamEnv::empty(traits::Reveal::All);
690 LayoutCx::new(self.tcx, param_env)
692 .unwrap_or_else(|e| match e {
693 LayoutError::SizeOverflow(_) => self.sess().fatal(&e.to_string()),
694 _ => bug!("failed to get layout for `{}`: {}", ty, e)
698 fn normalize_projections(self, ty: Ty<'tcx>) -> Ty<'tcx> {
699 self.tcx().normalize_associated_type(&ty)
703 impl<'a, 'tcx> LayoutTyper<'tcx> for &'a CrateContext<'a, 'tcx> {
704 type TyLayout = TyLayout<'tcx>;
706 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
710 fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
711 self.shared.layout_of(ty)
714 fn normalize_projections(self, ty: Ty<'tcx>) -> Ty<'tcx> {
715 self.shared.normalize_projections(ty)
719 /// Declare any llvm intrinsics that you might need
720 fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> {
722 ($name:expr, fn() -> $ret:expr) => (
724 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret));
725 llvm::SetUnnamedAddr(f, false);
726 ccx.intrinsics().borrow_mut().insert($name, f.clone());
730 ($name:expr, fn(...) -> $ret:expr) => (
732 let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret));
733 llvm::SetUnnamedAddr(f, false);
734 ccx.intrinsics().borrow_mut().insert($name, f.clone());
738 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
740 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret));
741 llvm::SetUnnamedAddr(f, false);
742 ccx.intrinsics().borrow_mut().insert($name, f.clone());
747 macro_rules! mk_struct {
748 ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
751 let i8p = Type::i8p(ccx);
752 let void = Type::void(ccx);
753 let i1 = Type::i1(ccx);
754 let t_i8 = Type::i8(ccx);
755 let t_i16 = Type::i16(ccx);
756 let t_i32 = Type::i32(ccx);
757 let t_i64 = Type::i64(ccx);
758 let t_i128 = Type::i128(ccx);
759 let t_f32 = Type::f32(ccx);
760 let t_f64 = Type::f64(ccx);
762 ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
763 ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
764 ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
765 ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
766 ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
767 ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
768 ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
769 ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
770 ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
772 ifn!("llvm.trap", fn() -> void);
773 ifn!("llvm.debugtrap", fn() -> void);
774 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
776 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
777 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
778 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
779 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
781 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
782 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
783 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
784 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
785 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
786 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
787 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
788 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
789 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
790 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
791 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
792 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
793 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
794 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
795 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
796 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
798 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
799 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
801 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
802 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
804 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
805 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
806 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
807 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
808 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
809 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
811 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
812 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
813 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
814 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
816 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
817 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
818 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
819 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
821 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
822 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
823 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
824 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
825 ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128);
827 ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
828 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
829 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
830 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
831 ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128);
833 ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
834 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
835 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
836 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
837 ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128);
839 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
840 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
841 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
842 ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128);
844 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
845 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
846 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
847 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
848 ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
850 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
851 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
852 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
853 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
854 ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
856 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
857 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
858 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
859 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
860 ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
862 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
863 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
864 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
865 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
866 ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
868 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
869 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
870 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
871 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
872 ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
874 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
875 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
876 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
877 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
878 ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
880 ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
881 ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
883 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
884 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
885 ifn!("llvm.localescape", fn(...) -> void);
886 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
887 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
889 ifn!("llvm.assume", fn(i1) -> void);
890 ifn!("llvm.prefetch", fn(i8p, t_i32, t_i32, t_i32) -> void);
892 if ccx.sess().opts.debuginfo != NoDebugInfo {
893 ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
894 ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);