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;
21 use monomorphize::Instance;
23 use partitioning::CodegenUnit;
25 use rustc_data_structures::base_n;
26 use rustc::ty::subst::Substs;
27 use rustc::ty::{self, Ty, TyCtxt};
28 use rustc::ty::layout::{LayoutTyper, TyLayout};
29 use rustc::session::config::{self, NoDebugInfo};
30 use rustc::session::Session;
31 use rustc::util::nodemap::{NodeSet, DefIdMap, FxHashMap};
33 use std::ffi::{CStr, CString};
34 use std::cell::{Cell, RefCell};
38 use std::marker::PhantomData;
40 use syntax::symbol::InternedString;
41 use syntax_pos::DUMMY_SP;
44 #[derive(Clone, Default)]
46 pub n_glues_created: Cell<usize>,
47 pub n_null_glues: Cell<usize>,
48 pub n_real_glues: Cell<usize>,
49 pub n_fns: Cell<usize>,
50 pub n_inlines: Cell<usize>,
51 pub n_closures: Cell<usize>,
52 pub n_llvm_insns: Cell<usize>,
53 pub llvm_insns: RefCell<FxHashMap<String, usize>>,
54 // (ident, llvm-instructions)
55 pub fn_stats: RefCell<Vec<(String, usize)> >,
59 pub fn extend(&mut self, stats: Stats) {
60 self.n_glues_created.set(self.n_glues_created.get() + stats.n_glues_created.get());
61 self.n_null_glues.set(self.n_null_glues.get() + stats.n_null_glues.get());
62 self.n_real_glues.set(self.n_real_glues.get() + stats.n_real_glues.get());
63 self.n_fns.set(self.n_fns.get() + stats.n_fns.get());
64 self.n_inlines.set(self.n_inlines.get() + stats.n_inlines.get());
65 self.n_closures.set(self.n_closures.get() + stats.n_closures.get());
66 self.n_llvm_insns.set(self.n_llvm_insns.get() + stats.n_llvm_insns.get());
67 self.llvm_insns.borrow_mut().extend(
68 stats.llvm_insns.borrow().iter()
69 .map(|(key, value)| (key.clone(), value.clone())));
70 self.fn_stats.borrow_mut().append(&mut *stats.fn_stats.borrow_mut());
74 /// The shared portion of a `CrateContext`. There is one `SharedCrateContext`
75 /// per crate. The data here is shared between all compilation units of the
76 /// crate, so it must not contain references to any LLVM data structures
77 /// (aside from metadata-related ones).
78 pub struct SharedCrateContext<'a, 'tcx: 'a> {
79 exported_symbols: NodeSet,
80 tcx: TyCtxt<'a, 'tcx, 'tcx>,
83 use_dll_storage_attrs: bool,
86 /// The local portion of a `CrateContext`. There is one `LocalCrateContext`
87 /// per compilation unit. Each one has its own LLVM `ContextRef` so that
88 /// several compilation units may be optimized in parallel. All other LLVM
89 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
90 pub struct LocalCrateContext<'a, 'tcx: 'a> {
94 codegen_unit: CodegenUnit<'tcx>,
95 /// Cache instances of monomorphic and polymorphic items
96 instances: RefCell<FxHashMap<Instance<'tcx>, ValueRef>>,
97 /// Cache generated vtables
98 vtables: RefCell<FxHashMap<(ty::Ty<'tcx>,
99 Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>>,
100 /// Cache of constant strings,
101 const_cstr_cache: RefCell<FxHashMap<InternedString, ValueRef>>,
103 /// Reverse-direction for const ptrs cast from globals.
104 /// Key is a ValueRef holding a *T,
105 /// Val is a ValueRef holding a *[T].
107 /// Needed because LLVM loses pointer->pointee association
108 /// when we ptrcast, and we have to ptrcast during translation
109 /// of a [T] const because we form a slice, a (*T,usize) pair, not
110 /// a pointer to an LLVM array type. Similar for trait objects.
111 const_unsized: RefCell<FxHashMap<ValueRef, ValueRef>>,
113 /// Cache of emitted const globals (value -> global)
114 const_globals: RefCell<FxHashMap<ValueRef, ValueRef>>,
116 /// Cache of emitted const values
117 const_values: RefCell<FxHashMap<(ast::NodeId, &'tcx Substs<'tcx>), ValueRef>>,
119 /// Cache of external const values
120 extern_const_values: RefCell<DefIdMap<ValueRef>>,
122 /// Mapping from static definitions to their DefId's.
123 statics: RefCell<FxHashMap<ValueRef, DefId>>,
125 /// List of globals for static variables which need to be passed to the
126 /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete.
127 /// (We have to make sure we don't invalidate any ValueRefs referring
129 statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>,
131 /// Statics that will be placed in the llvm.used variable
132 /// See http://llvm.org/docs/LangRef.html#the-llvm-used-global-variable for details
133 used_statics: RefCell<Vec<ValueRef>>,
135 lltypes: RefCell<FxHashMap<Ty<'tcx>, Type>>,
136 type_hashcodes: RefCell<FxHashMap<Ty<'tcx>, String>>,
138 opaque_vec_type: Type,
139 str_slice_type: Type,
141 dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>,
143 eh_personality: Cell<Option<ValueRef>>,
144 eh_unwind_resume: Cell<Option<ValueRef>>,
145 rust_try_fn: Cell<Option<ValueRef>>,
147 intrinsics: RefCell<FxHashMap<&'static str, ValueRef>>,
149 /// Depth of the current type-of computation - used to bail out
150 type_of_depth: Cell<usize>,
152 /// A counter that is used for generating local symbol names
153 local_gen_sym_counter: Cell<usize>,
155 /// A placeholder so we can add lifetimes
156 placeholder: PhantomData<&'a ()>,
159 /// A CrateContext value binds together one LocalCrateContext with the
160 /// SharedCrateContext. It exists as a convenience wrapper, so we don't have to
161 /// pass around (SharedCrateContext, LocalCrateContext) tuples all over trans.
162 pub struct CrateContext<'a, 'tcx: 'a> {
163 shared: &'a SharedCrateContext<'a, 'tcx>,
164 local_ccx: &'a LocalCrateContext<'a, 'tcx>,
167 impl<'a, 'tcx> CrateContext<'a, 'tcx> {
168 pub fn new(shared: &'a SharedCrateContext<'a, 'tcx>,
169 local_ccx: &'a LocalCrateContext<'a, 'tcx>)
171 CrateContext { shared, local_ccx }
175 impl<'a, 'tcx> DepGraphSafe for CrateContext<'a, 'tcx> {
178 pub fn get_reloc_model(sess: &Session) -> llvm::RelocMode {
179 let reloc_model_arg = match sess.opts.cg.relocation_model {
180 Some(ref s) => &s[..],
181 None => &sess.target.target.options.relocation_model[..],
184 match ::back::write::RELOC_MODEL_ARGS.iter().find(
185 |&&arg| arg.0 == reloc_model_arg) {
188 sess.err(&format!("{:?} is not a valid relocation mode",
192 sess.abort_if_errors();
198 fn is_any_library(sess: &Session) -> bool {
199 sess.crate_types.borrow().iter().any(|ty| {
200 *ty != config::CrateTypeExecutable
204 pub fn is_pie_binary(sess: &Session) -> bool {
205 !is_any_library(sess) && get_reloc_model(sess) == llvm::RelocMode::PIC
208 pub unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
209 let llcx = llvm::LLVMContextCreate();
210 let mod_name = CString::new(mod_name).unwrap();
211 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
213 // Ensure the data-layout values hardcoded remain the defaults.
214 if sess.target.target.options.is_builtin {
215 let tm = ::back::write::create_target_machine(sess);
216 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
217 llvm::LLVMRustDisposeTargetMachine(tm);
219 let data_layout = llvm::LLVMGetDataLayout(llmod);
220 let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes())
221 .ok().expect("got a non-UTF8 data-layout from LLVM");
223 // Unfortunately LLVM target specs change over time, and right now we
224 // don't have proper support to work with any more than one
225 // `data_layout` than the one that is in the rust-lang/rust repo. If
226 // this compiler is configured against a custom LLVM, we may have a
227 // differing data layout, even though we should update our own to use
230 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
231 // disable this check entirely as we may be configured with something
232 // that has a different target layout.
234 // Unsure if this will actually cause breakage when rustc is configured
238 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
239 let custom_llvm_used = cfg_llvm_root.trim() != "";
241 if !custom_llvm_used && sess.target.target.data_layout != data_layout {
242 bug!("data-layout for builtin `{}` target, `{}`, \
243 differs from LLVM default, `{}`",
244 sess.target.target.llvm_target,
245 sess.target.target.data_layout,
250 let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap();
251 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
253 let llvm_target = sess.target.target.llvm_target.as_bytes();
254 let llvm_target = CString::new(llvm_target).unwrap();
255 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
257 if is_pie_binary(sess) {
258 llvm::LLVMRustSetModulePIELevel(llmod);
264 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
265 pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
266 exported_symbols: NodeSet,
267 check_overflow: bool)
268 -> SharedCrateContext<'b, 'tcx> {
269 // An interesting part of Windows which MSVC forces our hand on (and
270 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
271 // attributes in LLVM IR as well as native dependencies (in C these
272 // correspond to `__declspec(dllimport)`).
274 // Whenever a dynamic library is built by MSVC it must have its public
275 // interface specified by functions tagged with `dllexport` or otherwise
276 // they're not available to be linked against. This poses a few problems
277 // for the compiler, some of which are somewhat fundamental, but we use
278 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
279 // attribute to all LLVM functions that are exported e.g. they're
280 // already tagged with external linkage). This is suboptimal for a few
283 // * If an object file will never be included in a dynamic library,
284 // there's no need to attach the dllexport attribute. Most object
285 // files in Rust are not destined to become part of a dll as binaries
286 // are statically linked by default.
287 // * If the compiler is emitting both an rlib and a dylib, the same
288 // source object file is currently used but with MSVC this may be less
289 // feasible. The compiler may be able to get around this, but it may
290 // involve some invasive changes to deal with this.
292 // The flipside of this situation is that whenever you link to a dll and
293 // you import a function from it, the import should be tagged with
294 // `dllimport`. At this time, however, the compiler does not emit
295 // `dllimport` for any declarations other than constants (where it is
296 // required), which is again suboptimal for even more reasons!
298 // * Calling a function imported from another dll without using
299 // `dllimport` causes the linker/compiler to have extra overhead (one
300 // `jmp` instruction on x86) when calling the function.
301 // * The same object file may be used in different circumstances, so a
302 // function may be imported from a dll if the object is linked into a
303 // dll, but it may be just linked against if linked into an rlib.
304 // * The compiler has no knowledge about whether native functions should
305 // be tagged dllimport or not.
307 // For now the compiler takes the perf hit (I do not have any numbers to
308 // this effect) by marking very little as `dllimport` and praying the
309 // linker will take care of everything. Fixing this problem will likely
310 // require adding a few attributes to Rust itself (feature gated at the
311 // start) and then strongly recommending static linkage on MSVC!
312 let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc;
315 exported_symbols: exported_symbols,
317 check_overflow: check_overflow,
318 use_dll_storage_attrs: use_dll_storage_attrs,
322 pub fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool {
323 ty.needs_drop(self.tcx, ty::ParamEnv::empty())
326 pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
327 ty.is_sized(self.tcx, ty::ParamEnv::empty(), DUMMY_SP)
330 pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
331 ty.is_freeze(self.tcx, ty::ParamEnv::empty(), DUMMY_SP)
334 pub fn exported_symbols<'a>(&'a self) -> &'a NodeSet {
335 &self.exported_symbols
338 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
342 pub fn sess<'a>(&'a self) -> &'a Session {
346 pub fn dep_graph<'a>(&'a self) -> &'a DepGraph {
350 pub fn use_dll_storage_attrs(&self) -> bool {
351 self.use_dll_storage_attrs
355 impl<'a, 'tcx> LocalCrateContext<'a, 'tcx> {
356 pub fn new(shared: &SharedCrateContext<'a, 'tcx>,
357 codegen_unit: CodegenUnit<'tcx>)
358 -> LocalCrateContext<'a, 'tcx> {
360 // Append ".rs" to LLVM module identifier.
362 // LLVM code generator emits a ".file filename" directive
363 // for ELF backends. Value of the "filename" is set as the
364 // LLVM module identifier. Due to a LLVM MC bug[1], LLVM
365 // crashes if the module identifier is same as other symbols
366 // such as a function name in the module.
367 // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
368 let llmod_id = format!("{}.rs", codegen_unit.name());
370 let (llcx, llmod) = create_context_and_module(&shared.tcx.sess,
373 let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
374 let dctx = debuginfo::CrateDebugContext::new(llmod);
375 debuginfo::metadata::compile_unit_metadata(shared,
384 let local_ccx = LocalCrateContext {
387 stats: Stats::default(),
388 codegen_unit: codegen_unit,
389 instances: RefCell::new(FxHashMap()),
390 vtables: RefCell::new(FxHashMap()),
391 const_cstr_cache: RefCell::new(FxHashMap()),
392 const_unsized: RefCell::new(FxHashMap()),
393 const_globals: RefCell::new(FxHashMap()),
394 const_values: RefCell::new(FxHashMap()),
395 extern_const_values: RefCell::new(DefIdMap()),
396 statics: RefCell::new(FxHashMap()),
397 statics_to_rauw: RefCell::new(Vec::new()),
398 used_statics: RefCell::new(Vec::new()),
399 lltypes: RefCell::new(FxHashMap()),
400 type_hashcodes: RefCell::new(FxHashMap()),
401 int_type: 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 type_of_depth: Cell::new(0),
410 local_gen_sym_counter: Cell::new(0),
411 placeholder: PhantomData,
414 let (int_type, opaque_vec_type, str_slice_ty, mut local_ccx) = {
415 // Do a little dance to create a dummy CrateContext, so we can
416 // create some things in the LLVM module of this codegen unit
417 let mut local_ccxs = vec![local_ccx];
418 let (int_type, opaque_vec_type, str_slice_ty) = {
419 let dummy_ccx = LocalCrateContext::dummy_ccx(shared,
420 local_ccxs.as_mut_slice());
421 let mut str_slice_ty = Type::named_struct(&dummy_ccx, "str_slice");
422 str_slice_ty.set_struct_body(&[Type::i8p(&dummy_ccx),
423 Type::int(&dummy_ccx)],
425 (Type::int(&dummy_ccx), Type::opaque_vec(&dummy_ccx), str_slice_ty)
427 (int_type, opaque_vec_type, str_slice_ty, local_ccxs.pop().unwrap())
430 local_ccx.int_type = int_type;
431 local_ccx.opaque_vec_type = opaque_vec_type;
432 local_ccx.str_slice_type = str_slice_ty;
438 /// Create a dummy `CrateContext` from `self` and the provided
439 /// `SharedCrateContext`. This is somewhat dangerous because `self` may
440 /// not be fully initialized.
442 /// This is used in the `LocalCrateContext` constructor to allow calling
443 /// functions that expect a complete `CrateContext`, even before the local
444 /// portion is fully initialized and attached to the `SharedCrateContext`.
445 fn dummy_ccx(shared: &'a SharedCrateContext<'a, 'tcx>,
446 local_ccxs: &'a [LocalCrateContext<'a, 'tcx>])
447 -> CrateContext<'a, 'tcx> {
448 assert!(local_ccxs.len() == 1);
451 local_ccx: &local_ccxs[0]
455 pub fn into_stats(self) -> Stats {
460 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
461 pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> {
465 fn local(&self) -> &'b LocalCrateContext<'b, 'tcx> {
469 pub fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
473 pub fn sess<'a>(&'a self) -> &'a Session {
474 &self.shared.tcx.sess
477 pub fn get_intrinsic(&self, key: &str) -> ValueRef {
478 if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
481 match declare_intrinsic(self, key) {
483 None => bug!("unknown intrinsic '{}'", key)
487 pub fn llmod(&self) -> ModuleRef {
491 pub fn llcx(&self) -> ContextRef {
495 pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> {
496 &self.local().codegen_unit
499 pub fn td(&self) -> llvm::TargetDataRef {
500 unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
503 pub fn instances<'a>(&'a self) -> &'a RefCell<FxHashMap<Instance<'tcx>, ValueRef>> {
504 &self.local().instances
507 pub fn vtables<'a>(&'a self)
508 -> &'a RefCell<FxHashMap<(ty::Ty<'tcx>,
509 Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>> {
510 &self.local().vtables
513 pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FxHashMap<InternedString, ValueRef>> {
514 &self.local().const_cstr_cache
517 pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
518 &self.local().const_unsized
521 pub fn const_globals<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> {
522 &self.local().const_globals
525 pub fn const_values<'a>(&'a self) -> &'a RefCell<FxHashMap<(ast::NodeId, &'tcx Substs<'tcx>),
527 &self.local().const_values
530 pub fn extern_const_values<'a>(&'a self) -> &'a RefCell<DefIdMap<ValueRef>> {
531 &self.local().extern_const_values
534 pub fn statics<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, DefId>> {
535 &self.local().statics
538 pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> {
539 &self.local().statics_to_rauw
542 pub fn used_statics<'a>(&'a self) -> &'a RefCell<Vec<ValueRef>> {
543 &self.local().used_statics
546 pub fn lltypes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, Type>> {
547 &self.local().lltypes
550 pub fn type_hashcodes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, String>> {
551 &self.local().type_hashcodes
554 pub fn stats<'a>(&'a self) -> &'a Stats {
558 pub fn int_type(&self) -> Type {
559 self.local().int_type
562 pub fn opaque_vec_type(&self) -> Type {
563 self.local().opaque_vec_type
566 pub fn str_slice_type(&self) -> Type {
567 self.local().str_slice_type
570 pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
574 pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> {
575 &self.local().rust_try_fn
578 fn intrinsics<'a>(&'a self) -> &'a RefCell<FxHashMap<&'static str, ValueRef>> {
579 &self.local().intrinsics
582 pub fn obj_size_bound(&self) -> u64 {
583 self.tcx().data_layout.obj_size_bound()
586 pub fn report_overbig_object(&self, obj: Ty<'tcx>) -> ! {
588 &format!("the type `{:?}` is too big for the current architecture",
592 pub fn enter_type_of(&self, ty: Ty<'tcx>) -> TypeOfDepthLock<'b, 'tcx> {
593 let current_depth = self.local().type_of_depth.get();
594 debug!("enter_type_of({:?}) at depth {:?}", ty, current_depth);
595 if current_depth > self.sess().recursion_limit.get() {
597 &format!("overflow representing the type `{}`", ty))
599 self.local().type_of_depth.set(current_depth + 1);
600 TypeOfDepthLock(self.local())
603 pub fn check_overflow(&self) -> bool {
604 self.shared.check_overflow
607 pub fn use_dll_storage_attrs(&self) -> bool {
608 self.shared.use_dll_storage_attrs()
611 /// Given the def-id of some item that has no type parameters, make
612 /// a suitable "empty substs" for it.
613 pub fn empty_substs_for_def_id(&self, item_def_id: DefId) -> &'tcx Substs<'tcx> {
614 self.tcx().empty_substs_for_def_id(item_def_id)
617 /// Generate a new symbol name with the given prefix. This symbol name must
618 /// only be used for definitions with `internal` or `private` linkage.
619 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
620 let idx = self.local().local_gen_sym_counter.get();
621 self.local().local_gen_sym_counter.set(idx + 1);
622 // Include a '.' character, so there can be no accidental conflicts with
623 // user defined names
624 let mut name = String::with_capacity(prefix.len() + 6);
625 name.push_str(prefix);
627 base_n::push_str(idx as u64, base_n::ALPHANUMERIC_ONLY, &mut name);
631 pub fn eh_personality(&self) -> ValueRef {
632 // The exception handling personality function.
634 // If our compilation unit has the `eh_personality` lang item somewhere
635 // within it, then we just need to translate that. Otherwise, we're
636 // building an rlib which will depend on some upstream implementation of
637 // this function, so we just codegen a generic reference to it. We don't
638 // specify any of the types for the function, we just make it a symbol
639 // that LLVM can later use.
641 // Note that MSVC is a little special here in that we don't use the
642 // `eh_personality` lang item at all. Currently LLVM has support for
643 // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
644 // *name of the personality function* to decide what kind of unwind side
645 // tables/landing pads to emit. It looks like Dwarf is used by default,
646 // injecting a dependency on the `_Unwind_Resume` symbol for resuming
647 // an "exception", but for MSVC we want to force SEH. This means that we
648 // can't actually have the personality function be our standard
649 // `rust_eh_personality` function, but rather we wired it up to the
650 // CRT's custom personality function, which forces LLVM to consider
651 // landing pads as "landing pads for SEH".
652 if let Some(llpersonality) = self.local().eh_personality.get() {
655 let tcx = self.tcx();
656 let llfn = match tcx.lang_items.eh_personality() {
657 Some(def_id) if !base::wants_msvc_seh(self.sess()) => {
658 callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]))
661 let name = if base::wants_msvc_seh(self.sess()) {
664 "rust_eh_personality"
666 let fty = Type::variadic_func(&[], &Type::i32(self));
667 declare::declare_cfn(self, name, fty)
670 self.local().eh_personality.set(Some(llfn));
674 // Returns a ValueRef of the "eh_unwind_resume" lang item if one is defined,
675 // otherwise declares it as an external function.
676 pub fn eh_unwind_resume(&self) -> ValueRef {
678 let unwresume = &self.local().eh_unwind_resume;
679 if let Some(llfn) = unwresume.get() {
683 let tcx = self.tcx();
684 assert!(self.sess().target.target.options.custom_unwind_resume);
685 if let Some(def_id) = tcx.lang_items.eh_unwind_resume() {
686 let llfn = callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]));
687 unwresume.set(Some(llfn));
691 let ty = tcx.mk_fn_ptr(ty::Binder(tcx.mk_fn_sig(
692 iter::once(tcx.mk_mut_ptr(tcx.types.u8)),
695 hir::Unsafety::Unsafe,
699 let llfn = declare::declare_fn(self, "rust_eh_unwind_resume", ty);
700 attributes::unwind(llfn, true);
701 unwresume.set(Some(llfn));
706 impl<'a, 'tcx> ty::layout::HasDataLayout for &'a SharedCrateContext<'a, 'tcx> {
707 fn data_layout(&self) -> &ty::layout::TargetDataLayout {
708 &self.tcx.data_layout
712 impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
713 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
718 impl<'a, 'tcx> ty::layout::HasDataLayout for &'a CrateContext<'a, 'tcx> {
719 fn data_layout(&self) -> &ty::layout::TargetDataLayout {
720 &self.shared.tcx.data_layout
724 impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a CrateContext<'a, 'tcx> {
725 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
730 impl<'a, 'tcx> LayoutTyper<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
731 type TyLayout = TyLayout<'tcx>;
733 fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
734 if let Some(&layout) = self.tcx().layout_cache.borrow().get(&ty) {
735 return TyLayout { ty: ty, layout: layout, variant_index: None };
738 self.tcx().infer_ctxt((), traits::Reveal::All).enter(|infcx| {
739 infcx.layout_of(ty).unwrap_or_else(|e| {
741 ty::layout::LayoutError::SizeOverflow(_) =>
742 self.sess().fatal(&e.to_string()),
743 _ => bug!("failed to get layout for `{}`: {}", ty, e)
749 fn normalize_projections(self, ty: Ty<'tcx>) -> Ty<'tcx> {
750 self.tcx().normalize_associated_type(&ty)
754 impl<'a, 'tcx> LayoutTyper<'tcx> for &'a CrateContext<'a, 'tcx> {
755 type TyLayout = TyLayout<'tcx>;
757 fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
758 self.shared.layout_of(ty)
761 fn normalize_projections(self, ty: Ty<'tcx>) -> Ty<'tcx> {
762 self.shared.normalize_projections(ty)
766 pub struct TypeOfDepthLock<'a, 'tcx: 'a>(&'a LocalCrateContext<'a, 'tcx>);
768 impl<'a, 'tcx> Drop for TypeOfDepthLock<'a, 'tcx> {
770 self.0.type_of_depth.set(self.0.type_of_depth.get() - 1);
774 /// Declare any llvm intrinsics that you might need
775 fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> {
777 ($name:expr, fn() -> $ret:expr) => (
779 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret));
780 llvm::SetUnnamedAddr(f, false);
781 ccx.intrinsics().borrow_mut().insert($name, f.clone());
785 ($name:expr, fn(...) -> $ret:expr) => (
787 let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret));
788 llvm::SetUnnamedAddr(f, false);
789 ccx.intrinsics().borrow_mut().insert($name, f.clone());
793 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
795 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret));
796 llvm::SetUnnamedAddr(f, false);
797 ccx.intrinsics().borrow_mut().insert($name, f.clone());
802 macro_rules! mk_struct {
803 ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
806 let i8p = Type::i8p(ccx);
807 let void = Type::void(ccx);
808 let i1 = Type::i1(ccx);
809 let t_i8 = Type::i8(ccx);
810 let t_i16 = Type::i16(ccx);
811 let t_i32 = Type::i32(ccx);
812 let t_i64 = Type::i64(ccx);
813 let t_i128 = Type::i128(ccx);
814 let t_f32 = Type::f32(ccx);
815 let t_f64 = Type::f64(ccx);
817 ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
818 ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
819 ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
820 ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
821 ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
822 ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
823 ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
824 ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
825 ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
827 ifn!("llvm.trap", fn() -> void);
828 ifn!("llvm.debugtrap", fn() -> void);
829 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
831 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
832 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
833 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
834 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
836 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
837 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
838 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
839 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
840 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
841 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
842 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
843 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
844 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
845 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
846 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
847 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
848 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
849 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
850 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
851 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
853 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
854 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
856 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
857 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
859 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
860 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
861 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
862 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
863 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
864 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
866 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
867 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
868 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
869 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
871 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
872 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
873 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
874 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
876 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
877 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
878 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
879 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
880 ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128);
882 ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
883 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
884 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
885 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
886 ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128);
888 ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
889 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
890 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
891 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
892 ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128);
894 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
895 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
896 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
897 ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128);
899 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
900 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
901 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
902 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
903 ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
905 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
906 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
907 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
908 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
909 ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
911 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
912 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
913 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
914 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
915 ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
917 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
918 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
919 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
920 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
921 ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
923 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
924 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
925 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
926 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
927 ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
929 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
930 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
931 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
932 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
933 ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
935 ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
936 ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
938 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
939 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
940 ifn!("llvm.localescape", fn(...) -> void);
941 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
942 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
944 ifn!("llvm.assume", fn(i1) -> void);
946 if ccx.sess().opts.debuginfo != NoDebugInfo {
947 ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
948 ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);