2 use crate::back::write::to_llvm_code_model;
3 use crate::callee::get_fn;
4 use crate::coverageinfo;
8 use crate::type_::Type;
9 use crate::value::Value;
12 use rustc_codegen_ssa::base::wants_msvc_seh;
13 use rustc_codegen_ssa::traits::*;
14 use rustc_data_structures::base_n;
15 use rustc_data_structures::fx::FxHashMap;
16 use rustc_data_structures::small_c_str::SmallCStr;
17 use rustc_middle::bug;
18 use rustc_middle::mir::mono::CodegenUnit;
19 use rustc_middle::ty::layout::{HasParamEnv, LayoutError, TyAndLayout};
20 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
21 use rustc_session::config::{CFGuard, CrateType, DebugInfo};
22 use rustc_session::Session;
23 use rustc_span::source_map::{Span, DUMMY_SP};
24 use rustc_span::symbol::Symbol;
25 use rustc_target::abi::{HasDataLayout, LayoutOf, PointeeInfo, Size, TargetDataLayout, VariantIdx};
26 use rustc_target::spec::{HasTargetSpec, RelocModel, Target, TlsModel};
27 use smallvec::SmallVec;
29 use std::cell::{Cell, RefCell};
33 /// There is one `CodegenCx` per compilation unit. Each one has its own LLVM
34 /// `llvm::Context` so that several compilation units may be optimized in parallel.
35 /// All other LLVM data structures in the `CodegenCx` are tied to that `llvm::Context`.
36 pub struct CodegenCx<'ll, 'tcx> {
37 pub tcx: TyCtxt<'tcx>,
38 pub check_overflow: bool,
39 pub use_dll_storage_attrs: bool,
40 pub tls_model: llvm::ThreadLocalMode,
42 pub llmod: &'ll llvm::Module,
43 pub llcx: &'ll llvm::Context,
44 pub codegen_unit: &'tcx CodegenUnit<'tcx>,
46 /// Cache instances of monomorphic and polymorphic items
47 pub instances: RefCell<FxHashMap<Instance<'tcx>, &'ll Value>>,
48 /// Cache generated vtables
50 RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), &'ll Value>>,
51 /// Cache of constant strings,
52 pub const_cstr_cache: RefCell<FxHashMap<Symbol, &'ll Value>>,
54 /// Reverse-direction for const ptrs cast from globals.
56 /// Key is a Value holding a `*T`,
57 /// Val is a Value holding a `*[T]`.
59 /// Needed because LLVM loses pointer->pointee association
60 /// when we ptrcast, and we have to ptrcast during codegen
61 /// of a `[T]` const because we form a slice, a `(*T,usize)` pair, not
62 /// a pointer to an LLVM array type. Similar for trait objects.
63 pub const_unsized: RefCell<FxHashMap<&'ll Value, &'ll Value>>,
65 /// Cache of emitted const globals (value -> global)
66 pub const_globals: RefCell<FxHashMap<&'ll Value, &'ll Value>>,
68 /// List of globals for static variables which need to be passed to the
69 /// LLVM function ReplaceAllUsesWith (RAUW) when codegen is complete.
70 /// (We have to make sure we don't invalidate any Values referring
72 pub statics_to_rauw: RefCell<Vec<(&'ll Value, &'ll Value)>>,
74 /// Statics that will be placed in the llvm.used variable
75 /// See <https://llvm.org/docs/LangRef.html#the-llvm-used-global-variable> for details
76 pub used_statics: RefCell<Vec<&'ll Value>>,
78 /// Mapping of non-scalar types to llvm types and field remapping if needed.
79 pub type_lowering: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), TypeLowering<'ll>>>,
81 /// Mapping of scalar types to llvm types.
82 pub scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, &'ll Type>>,
84 pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>,
85 pub isize_ty: &'ll Type,
87 pub coverage_cx: Option<coverageinfo::CrateCoverageContext<'ll, 'tcx>>,
88 pub dbg_cx: Option<debuginfo::CrateDebugContext<'ll, 'tcx>>,
90 eh_personality: Cell<Option<&'ll Value>>,
91 eh_catch_typeinfo: Cell<Option<&'ll Value>>,
92 pub rust_try_fn: Cell<Option<&'ll Value>>,
94 intrinsics: RefCell<FxHashMap<&'static str, &'ll Value>>,
96 /// A counter that is used for generating local symbol names
97 local_gen_sym_counter: Cell<usize>,
100 pub struct TypeLowering<'ll> {
101 /// Associated LLVM type
102 pub lltype: &'ll Type,
104 /// If padding is used the slice maps fields from source order
106 pub field_remapping: Option<SmallVec<[u32; 4]>>,
109 fn to_llvm_tls_model(tls_model: TlsModel) -> llvm::ThreadLocalMode {
111 TlsModel::GeneralDynamic => llvm::ThreadLocalMode::GeneralDynamic,
112 TlsModel::LocalDynamic => llvm::ThreadLocalMode::LocalDynamic,
113 TlsModel::InitialExec => llvm::ThreadLocalMode::InitialExec,
114 TlsModel::LocalExec => llvm::ThreadLocalMode::LocalExec,
118 fn strip_powerpc64_vectors(data_layout: String) -> String {
119 data_layout.replace("-v256:256:256-v512:512:512", "")
122 pub unsafe fn create_module(
124 llcx: &'ll llvm::Context,
126 ) -> &'ll llvm::Module {
128 let mod_name = SmallCStr::new(mod_name);
129 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
131 let mut target_data_layout = sess.target.data_layout.clone();
132 if llvm_util::get_version() < (12, 0, 0) && sess.target.arch == "powerpc64" {
133 target_data_layout = strip_powerpc64_vectors(target_data_layout);
136 // Ensure the data-layout values hardcoded remain the defaults.
137 if sess.target.is_builtin {
138 let tm = crate::back::write::create_informational_target_machine(tcx.sess);
139 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
140 llvm::LLVMRustDisposeTargetMachine(tm);
142 let llvm_data_layout = llvm::LLVMGetDataLayoutStr(llmod);
143 let llvm_data_layout = str::from_utf8(CStr::from_ptr(llvm_data_layout).to_bytes())
144 .expect("got a non-UTF8 data-layout from LLVM");
146 // Unfortunately LLVM target specs change over time, and right now we
147 // don't have proper support to work with any more than one
148 // `data_layout` than the one that is in the rust-lang/rust repo. If
149 // this compiler is configured against a custom LLVM, we may have a
150 // differing data layout, even though we should update our own to use
153 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
154 // disable this check entirely as we may be configured with something
155 // that has a different target layout.
157 // Unsure if this will actually cause breakage when rustc is configured
161 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
162 let custom_llvm_used = cfg_llvm_root.trim() != "";
164 if !custom_llvm_used && target_data_layout != llvm_data_layout {
166 "data-layout for target `{rustc_target}`, `{rustc_layout}`, \
167 differs from LLVM target's `{llvm_target}` default layout, `{llvm_layout}`",
168 rustc_target = sess.opts.target_triple,
169 rustc_layout = target_data_layout,
170 llvm_target = sess.target.llvm_target,
171 llvm_layout = llvm_data_layout
176 let data_layout = SmallCStr::new(&target_data_layout);
177 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
179 let llvm_target = SmallCStr::new(&sess.target.llvm_target);
180 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
182 if sess.relocation_model() == RelocModel::Pic {
183 llvm::LLVMRustSetModulePICLevel(llmod);
184 // PIE is potentially more effective than PIC, but can only be used in executables.
185 // If all our outputs are executables, then we can relax PIC to PIE.
186 if sess.crate_types().iter().all(|ty| *ty == CrateType::Executable) {
187 llvm::LLVMRustSetModulePIELevel(llmod);
191 // Linking object files with different code models is undefined behavior
192 // because the compiler would have to generate additional code (to span
193 // longer jumps) if a larger code model is used with a smaller one.
195 // See https://reviews.llvm.org/D52322 and https://reviews.llvm.org/D52323.
196 llvm::LLVMRustSetModuleCodeModel(llmod, to_llvm_code_model(sess.code_model()));
198 // If skipping the PLT is enabled, we need to add some module metadata
199 // to ensure intrinsic calls don't use it.
200 if !sess.needs_plt() {
201 let avoid_plt = "RtLibUseGOT\0".as_ptr().cast();
202 llvm::LLVMRustAddModuleFlag(llmod, avoid_plt, 1);
205 // Control Flow Guard is currently only supported by the MSVC linker on Windows.
206 if sess.target.is_like_msvc {
207 match sess.opts.cg.control_flow_guard {
208 CFGuard::Disabled => {}
209 CFGuard::NoChecks => {
210 // Set `cfguard=1` module flag to emit metadata only.
211 llvm::LLVMRustAddModuleFlag(llmod, "cfguard\0".as_ptr() as *const _, 1)
214 // Set `cfguard=2` module flag to emit metadata and checks.
215 llvm::LLVMRustAddModuleFlag(llmod, "cfguard\0".as_ptr() as *const _, 2)
223 impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
226 codegen_unit: &'tcx CodegenUnit<'tcx>,
227 llvm_module: &'ll crate::ModuleLlvm,
229 // An interesting part of Windows which MSVC forces our hand on (and
230 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
231 // attributes in LLVM IR as well as native dependencies (in C these
232 // correspond to `__declspec(dllimport)`).
234 // LD (BFD) in MinGW mode can often correctly guess `dllexport` but
235 // relying on that can result in issues like #50176.
236 // LLD won't support that and expects symbols with proper attributes.
237 // Because of that we make MinGW target emit dllexport just like MSVC.
238 // When it comes to dllimport we use it for constants but for functions
239 // rely on the linker to do the right thing. Opposed to dllexport this
240 // task is easy for them (both LD and LLD) and allows us to easily use
241 // symbols from static libraries in shared libraries.
243 // Whenever a dynamic library is built on Windows it must have its public
244 // interface specified by functions tagged with `dllexport` or otherwise
245 // they're not available to be linked against. This poses a few problems
246 // for the compiler, some of which are somewhat fundamental, but we use
247 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
248 // attribute to all LLVM functions that are exported e.g., they're
249 // already tagged with external linkage). This is suboptimal for a few
252 // * If an object file will never be included in a dynamic library,
253 // there's no need to attach the dllexport attribute. Most object
254 // files in Rust are not destined to become part of a dll as binaries
255 // are statically linked by default.
256 // * If the compiler is emitting both an rlib and a dylib, the same
257 // source object file is currently used but with MSVC this may be less
258 // feasible. The compiler may be able to get around this, but it may
259 // involve some invasive changes to deal with this.
261 // The flipside of this situation is that whenever you link to a dll and
262 // you import a function from it, the import should be tagged with
263 // `dllimport`. At this time, however, the compiler does not emit
264 // `dllimport` for any declarations other than constants (where it is
265 // required), which is again suboptimal for even more reasons!
267 // * Calling a function imported from another dll without using
268 // `dllimport` causes the linker/compiler to have extra overhead (one
269 // `jmp` instruction on x86) when calling the function.
270 // * The same object file may be used in different circumstances, so a
271 // function may be imported from a dll if the object is linked into a
272 // dll, but it may be just linked against if linked into an rlib.
273 // * The compiler has no knowledge about whether native functions should
274 // be tagged dllimport or not.
276 // For now the compiler takes the perf hit (I do not have any numbers to
277 // this effect) by marking very little as `dllimport` and praying the
278 // linker will take care of everything. Fixing this problem will likely
279 // require adding a few attributes to Rust itself (feature gated at the
280 // start) and then strongly recommending static linkage on Windows!
281 let use_dll_storage_attrs = tcx.sess.target.is_like_windows;
283 let check_overflow = tcx.sess.overflow_checks();
285 let tls_model = to_llvm_tls_model(tcx.sess.tls_model());
287 let (llcx, llmod) = (&*llvm_module.llcx, llvm_module.llmod());
289 let coverage_cx = if tcx.sess.instrument_coverage() {
290 let covctx = coverageinfo::CrateCoverageContext::new();
296 let dbg_cx = if tcx.sess.opts.debuginfo != DebugInfo::None {
297 let dctx = debuginfo::CrateDebugContext::new(llmod);
298 debuginfo::metadata::compile_unit_metadata(tcx, &codegen_unit.name().as_str(), &dctx);
304 let isize_ty = Type::ix_llcx(llcx, tcx.data_layout.pointer_size.bits());
309 use_dll_storage_attrs,
314 instances: Default::default(),
315 vtables: Default::default(),
316 const_cstr_cache: Default::default(),
317 const_unsized: Default::default(),
318 const_globals: Default::default(),
319 statics_to_rauw: RefCell::new(Vec::new()),
320 used_statics: RefCell::new(Vec::new()),
321 type_lowering: Default::default(),
322 scalar_lltypes: Default::default(),
323 pointee_infos: Default::default(),
327 eh_personality: Cell::new(None),
328 eh_catch_typeinfo: Cell::new(None),
329 rust_try_fn: Cell::new(None),
330 intrinsics: Default::default(),
331 local_gen_sym_counter: Cell::new(0),
335 crate fn statics_to_rauw(&self) -> &RefCell<Vec<(&'ll Value, &'ll Value)>> {
336 &self.statics_to_rauw
340 pub fn coverage_context(&'a self) -> Option<&'a coverageinfo::CrateCoverageContext<'ll, 'tcx>> {
341 self.coverage_cx.as_ref()
345 impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
348 ) -> &RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), &'ll Value>>
353 fn get_fn(&self, instance: Instance<'tcx>) -> &'ll Value {
354 get_fn(self, instance)
357 fn get_fn_addr(&self, instance: Instance<'tcx>) -> &'ll Value {
358 get_fn(self, instance)
361 fn eh_personality(&self) -> &'ll Value {
362 // The exception handling personality function.
364 // If our compilation unit has the `eh_personality` lang item somewhere
365 // within it, then we just need to codegen that. Otherwise, we're
366 // building an rlib which will depend on some upstream implementation of
367 // this function, so we just codegen a generic reference to it. We don't
368 // specify any of the types for the function, we just make it a symbol
369 // that LLVM can later use.
371 // Note that MSVC is a little special here in that we don't use the
372 // `eh_personality` lang item at all. Currently LLVM has support for
373 // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
374 // *name of the personality function* to decide what kind of unwind side
375 // tables/landing pads to emit. It looks like Dwarf is used by default,
376 // injecting a dependency on the `_Unwind_Resume` symbol for resuming
377 // an "exception", but for MSVC we want to force SEH. This means that we
378 // can't actually have the personality function be our standard
379 // `rust_eh_personality` function, but rather we wired it up to the
380 // CRT's custom personality function, which forces LLVM to consider
381 // landing pads as "landing pads for SEH".
382 if let Some(llpersonality) = self.eh_personality.get() {
383 return llpersonality;
386 let llfn = match tcx.lang_items().eh_personality() {
387 Some(def_id) if !wants_msvc_seh(self.sess()) => self.get_fn_addr(
388 ty::Instance::resolve(
390 ty::ParamEnv::reveal_all(),
392 tcx.intern_substs(&[]),
398 let name = if wants_msvc_seh(self.sess()) {
401 "rust_eh_personality"
403 if let Some(llfn) = self.get_declared_value(name) {
406 let fty = self.type_variadic_func(&[], self.type_i32());
407 let llfn = self.declare_cfn(name, llvm::UnnamedAddr::Global, fty);
408 attributes::apply_target_cpu_attr(self, llfn);
413 self.eh_personality.set(Some(llfn));
417 fn sess(&self) -> &Session {
421 fn check_overflow(&self) -> bool {
425 fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
429 fn used_statics(&self) -> &RefCell<Vec<&'ll Value>> {
433 fn set_frame_pointer_type(&self, llfn: &'ll Value) {
434 attributes::set_frame_pointer_type(self, llfn)
437 fn apply_target_cpu_attr(&self, llfn: &'ll Value) {
438 attributes::apply_target_cpu_attr(self, llfn);
439 attributes::apply_tune_cpu_attr(self, llfn);
442 fn create_used_variable(&self) {
443 let name = cstr!("llvm.used");
444 let section = cstr!("llvm.metadata");
446 self.const_array(&self.type_ptr_to(self.type_i8()), &*self.used_statics.borrow());
449 let g = llvm::LLVMAddGlobal(self.llmod, self.val_ty(array), name.as_ptr());
450 llvm::LLVMSetInitializer(g, array);
451 llvm::LLVMRustSetLinkage(g, llvm::Linkage::AppendingLinkage);
452 llvm::LLVMSetSection(g, section.as_ptr());
456 fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
457 if self.get_declared_value("main").is_none() {
458 Some(self.declare_cfn("main", llvm::UnnamedAddr::Global, fn_type))
460 // If the symbol already exists, it is an error: for example, the user wrote
461 // #[no_mangle] extern "C" fn main(..) {..}
462 // instead of #[start]
468 impl CodegenCx<'b, 'tcx> {
469 crate fn get_intrinsic(&self, key: &str) -> &'b Value {
470 if let Some(v) = self.intrinsics.borrow().get(key).cloned() {
474 self.declare_intrinsic(key).unwrap_or_else(|| bug!("unknown intrinsic '{}'", key))
480 args: Option<&[&'b llvm::Type]>,
482 ) -> &'b llvm::Value {
483 let fn_ty = if let Some(args) = args {
484 self.type_func(args, ret)
486 self.type_variadic_func(&[], ret)
488 let f = self.declare_cfn(name, llvm::UnnamedAddr::No, fn_ty);
489 self.intrinsics.borrow_mut().insert(name, f);
493 fn declare_intrinsic(&self, key: &str) -> Option<&'b Value> {
495 ($name:expr, fn() -> $ret:expr) => (
497 return Some(self.insert_intrinsic($name, Some(&[]), $ret));
500 ($name:expr, fn(...) -> $ret:expr) => (
502 return Some(self.insert_intrinsic($name, None, $ret));
505 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
507 return Some(self.insert_intrinsic($name, Some(&[$($arg),*]), $ret));
511 macro_rules! mk_struct {
512 ($($field_ty:expr),*) => (self.type_struct( &[$($field_ty),*], false))
515 let i8p = self.type_i8p();
516 let void = self.type_void();
517 let i1 = self.type_i1();
518 let t_i8 = self.type_i8();
519 let t_i16 = self.type_i16();
520 let t_i32 = self.type_i32();
521 let t_i64 = self.type_i64();
522 let t_i128 = self.type_i128();
523 let t_isize = self.type_isize();
524 let t_f32 = self.type_f32();
525 let t_f64 = self.type_f64();
527 ifn!("llvm.wasm.trunc.unsigned.i32.f32", fn(t_f32) -> t_i32);
528 ifn!("llvm.wasm.trunc.unsigned.i32.f64", fn(t_f64) -> t_i32);
529 ifn!("llvm.wasm.trunc.unsigned.i64.f32", fn(t_f32) -> t_i64);
530 ifn!("llvm.wasm.trunc.unsigned.i64.f64", fn(t_f64) -> t_i64);
531 ifn!("llvm.wasm.trunc.signed.i32.f32", fn(t_f32) -> t_i32);
532 ifn!("llvm.wasm.trunc.signed.i32.f64", fn(t_f64) -> t_i32);
533 ifn!("llvm.wasm.trunc.signed.i64.f32", fn(t_f32) -> t_i64);
534 ifn!("llvm.wasm.trunc.signed.i64.f64", fn(t_f64) -> t_i64);
536 ifn!("llvm.fptosi.sat.i8.f32", fn(t_f32) -> t_i8);
537 ifn!("llvm.fptosi.sat.i16.f32", fn(t_f32) -> t_i16);
538 ifn!("llvm.fptosi.sat.i32.f32", fn(t_f32) -> t_i32);
539 ifn!("llvm.fptosi.sat.i64.f32", fn(t_f32) -> t_i64);
540 ifn!("llvm.fptosi.sat.i128.f32", fn(t_f32) -> t_i128);
541 ifn!("llvm.fptosi.sat.i8.f64", fn(t_f64) -> t_i8);
542 ifn!("llvm.fptosi.sat.i16.f64", fn(t_f64) -> t_i16);
543 ifn!("llvm.fptosi.sat.i32.f64", fn(t_f64) -> t_i32);
544 ifn!("llvm.fptosi.sat.i64.f64", fn(t_f64) -> t_i64);
545 ifn!("llvm.fptosi.sat.i128.f64", fn(t_f64) -> t_i128);
547 ifn!("llvm.fptoui.sat.i8.f32", fn(t_f32) -> t_i8);
548 ifn!("llvm.fptoui.sat.i16.f32", fn(t_f32) -> t_i16);
549 ifn!("llvm.fptoui.sat.i32.f32", fn(t_f32) -> t_i32);
550 ifn!("llvm.fptoui.sat.i64.f32", fn(t_f32) -> t_i64);
551 ifn!("llvm.fptoui.sat.i128.f32", fn(t_f32) -> t_i128);
552 ifn!("llvm.fptoui.sat.i8.f64", fn(t_f64) -> t_i8);
553 ifn!("llvm.fptoui.sat.i16.f64", fn(t_f64) -> t_i16);
554 ifn!("llvm.fptoui.sat.i32.f64", fn(t_f64) -> t_i32);
555 ifn!("llvm.fptoui.sat.i64.f64", fn(t_f64) -> t_i64);
556 ifn!("llvm.fptoui.sat.i128.f64", fn(t_f64) -> t_i128);
558 ifn!("llvm.trap", fn() -> void);
559 ifn!("llvm.debugtrap", fn() -> void);
560 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
561 ifn!("llvm.sideeffect", fn() -> void);
563 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
564 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
566 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
567 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
569 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
570 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
572 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
573 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
575 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
576 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
578 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
579 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
581 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
582 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
584 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
585 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
587 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
588 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
590 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
591 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
593 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
594 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
596 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
597 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
599 ifn!("llvm.minnum.f32", fn(t_f32, t_f32) -> t_f32);
600 ifn!("llvm.minnum.f64", fn(t_f64, t_f64) -> t_f64);
601 ifn!("llvm.maxnum.f32", fn(t_f32, t_f32) -> t_f32);
602 ifn!("llvm.maxnum.f64", fn(t_f64, t_f64) -> t_f64);
604 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
605 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
607 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
608 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
610 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
611 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
613 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
614 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
615 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
616 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
618 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
619 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
620 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
621 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
623 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
624 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
625 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
626 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
627 ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128);
629 ifn!("llvm.ctlz.i8", fn(t_i8, i1) -> t_i8);
630 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
631 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
632 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
633 ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128);
635 ifn!("llvm.cttz.i8", fn(t_i8, i1) -> t_i8);
636 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
637 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
638 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
639 ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128);
641 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
642 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
643 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
644 ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128);
646 ifn!("llvm.bitreverse.i8", fn(t_i8) -> t_i8);
647 ifn!("llvm.bitreverse.i16", fn(t_i16) -> t_i16);
648 ifn!("llvm.bitreverse.i32", fn(t_i32) -> t_i32);
649 ifn!("llvm.bitreverse.i64", fn(t_i64) -> t_i64);
650 ifn!("llvm.bitreverse.i128", fn(t_i128) -> t_i128);
652 ifn!("llvm.fshl.i8", fn(t_i8, t_i8, t_i8) -> t_i8);
653 ifn!("llvm.fshl.i16", fn(t_i16, t_i16, t_i16) -> t_i16);
654 ifn!("llvm.fshl.i32", fn(t_i32, t_i32, t_i32) -> t_i32);
655 ifn!("llvm.fshl.i64", fn(t_i64, t_i64, t_i64) -> t_i64);
656 ifn!("llvm.fshl.i128", fn(t_i128, t_i128, t_i128) -> t_i128);
658 ifn!("llvm.fshr.i8", fn(t_i8, t_i8, t_i8) -> t_i8);
659 ifn!("llvm.fshr.i16", fn(t_i16, t_i16, t_i16) -> t_i16);
660 ifn!("llvm.fshr.i32", fn(t_i32, t_i32, t_i32) -> t_i32);
661 ifn!("llvm.fshr.i64", fn(t_i64, t_i64, t_i64) -> t_i64);
662 ifn!("llvm.fshr.i128", fn(t_i128, t_i128, t_i128) -> t_i128);
664 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
665 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
666 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
667 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
668 ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
670 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
671 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
672 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
673 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
674 ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
676 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
677 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
678 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
679 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
680 ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
682 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
683 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
684 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
685 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
686 ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
688 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
689 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
690 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
691 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
692 ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
694 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
695 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
696 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
697 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
698 ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
700 ifn!("llvm.sadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
701 ifn!("llvm.sadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
702 ifn!("llvm.sadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
703 ifn!("llvm.sadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
704 ifn!("llvm.sadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
706 ifn!("llvm.uadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
707 ifn!("llvm.uadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
708 ifn!("llvm.uadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
709 ifn!("llvm.uadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
710 ifn!("llvm.uadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
712 ifn!("llvm.ssub.sat.i8", fn(t_i8, t_i8) -> t_i8);
713 ifn!("llvm.ssub.sat.i16", fn(t_i16, t_i16) -> t_i16);
714 ifn!("llvm.ssub.sat.i32", fn(t_i32, t_i32) -> t_i32);
715 ifn!("llvm.ssub.sat.i64", fn(t_i64, t_i64) -> t_i64);
716 ifn!("llvm.ssub.sat.i128", fn(t_i128, t_i128) -> t_i128);
718 ifn!("llvm.usub.sat.i8", fn(t_i8, t_i8) -> t_i8);
719 ifn!("llvm.usub.sat.i16", fn(t_i16, t_i16) -> t_i16);
720 ifn!("llvm.usub.sat.i32", fn(t_i32, t_i32) -> t_i32);
721 ifn!("llvm.usub.sat.i64", fn(t_i64, t_i64) -> t_i64);
722 ifn!("llvm.usub.sat.i128", fn(t_i128, t_i128) -> t_i128);
724 ifn!("llvm.lifetime.start.p0i8", fn(t_i64, i8p) -> void);
725 ifn!("llvm.lifetime.end.p0i8", fn(t_i64, i8p) -> void);
727 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
728 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
729 ifn!("llvm.localescape", fn(...) -> void);
730 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
731 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
733 ifn!("llvm.assume", fn(i1) -> void);
734 ifn!("llvm.prefetch", fn(i8p, t_i32, t_i32, t_i32) -> void);
736 // This isn't an "LLVM intrinsic", but LLVM's optimization passes
737 // recognize it like one and we assume it exists in `core::slice::cmp`
738 ifn!("memcmp", fn(i8p, i8p, t_isize) -> t_i32);
740 // variadic intrinsics
741 ifn!("llvm.va_start", fn(i8p) -> void);
742 ifn!("llvm.va_end", fn(i8p) -> void);
743 ifn!("llvm.va_copy", fn(i8p, i8p) -> void);
745 if self.sess().instrument_coverage() {
746 ifn!("llvm.instrprof.increment", fn(i8p, t_i64, t_i32, t_i32) -> void);
749 if self.sess().opts.debuginfo != DebugInfo::None {
750 ifn!("llvm.dbg.declare", fn(self.type_metadata(), self.type_metadata()) -> void);
751 ifn!("llvm.dbg.value", fn(self.type_metadata(), t_i64, self.type_metadata()) -> void);
756 crate fn eh_catch_typeinfo(&self) -> &'b Value {
757 if let Some(eh_catch_typeinfo) = self.eh_catch_typeinfo.get() {
758 return eh_catch_typeinfo;
761 assert!(self.sess().target.is_like_emscripten);
762 let eh_catch_typeinfo = match tcx.lang_items().eh_catch_typeinfo() {
763 Some(def_id) => self.get_static(def_id),
766 .type_struct(&[self.type_ptr_to(self.type_isize()), self.type_i8p()], false);
767 self.declare_global("rust_eh_catch_typeinfo", ty)
770 let eh_catch_typeinfo = self.const_bitcast(eh_catch_typeinfo, self.type_i8p());
771 self.eh_catch_typeinfo.set(Some(eh_catch_typeinfo));
776 impl<'b, 'tcx> CodegenCx<'b, 'tcx> {
777 /// Generates a new symbol name with the given prefix. This symbol name must
778 /// only be used for definitions with `internal` or `private` linkage.
779 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
780 let idx = self.local_gen_sym_counter.get();
781 self.local_gen_sym_counter.set(idx + 1);
782 // Include a '.' character, so there can be no accidental conflicts with
783 // user defined names
784 let mut name = String::with_capacity(prefix.len() + 6);
785 name.push_str(prefix);
787 base_n::push_str(idx as u128, base_n::ALPHANUMERIC_ONLY, &mut name);
792 impl HasDataLayout for CodegenCx<'ll, 'tcx> {
794 fn data_layout(&self) -> &TargetDataLayout {
795 &self.tcx.data_layout
799 impl HasTargetSpec for CodegenCx<'ll, 'tcx> {
801 fn target_spec(&self) -> &Target {
802 &self.tcx.sess.target
806 impl ty::layout::HasTyCtxt<'tcx> for CodegenCx<'ll, 'tcx> {
808 fn tcx(&self) -> TyCtxt<'tcx> {
813 impl LayoutOf for CodegenCx<'ll, 'tcx> {
815 type TyAndLayout = TyAndLayout<'tcx>;
817 fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
818 self.spanned_layout_of(ty, DUMMY_SP)
821 fn spanned_layout_of(&self, ty: Ty<'tcx>, span: Span) -> Self::TyAndLayout {
822 self.tcx.layout_of(ty::ParamEnv::reveal_all().and(ty)).unwrap_or_else(|e| {
823 if let LayoutError::SizeOverflow(_) = e {
824 self.sess().span_fatal(span, &e.to_string())
826 bug!("failed to get layout for `{}`: {}", ty, e)
832 impl<'tcx, 'll> HasParamEnv<'tcx> for CodegenCx<'ll, 'tcx> {
833 fn param_env(&self) -> ty::ParamEnv<'tcx> {
834 ty::ParamEnv::reveal_all()