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::mir::mono::CodegenUnit;
18 use rustc_middle::ty::layout::{
19 FnAbiError, FnAbiOfHelpers, FnAbiRequest, HasParamEnv, LayoutError, LayoutOfHelpers,
22 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
23 use rustc_middle::{bug, span_bug};
24 use rustc_session::config::{BranchProtection, CFGuard, CrateType, DebugInfo, PAuthKey};
25 use rustc_session::Session;
26 use rustc_span::source_map::Span;
27 use rustc_span::symbol::Symbol;
28 use rustc_target::abi::{
29 call::FnAbi, HasDataLayout, PointeeInfo, Size, TargetDataLayout, VariantIdx,
31 use rustc_target::spec::{HasTargetSpec, RelocModel, Target, TlsModel};
32 use smallvec::SmallVec;
34 use std::cell::{Cell, RefCell};
38 /// There is one `CodegenCx` per compilation unit. Each one has its own LLVM
39 /// `llvm::Context` so that several compilation units may be optimized in parallel.
40 /// All other LLVM data structures in the `CodegenCx` are tied to that `llvm::Context`.
41 pub struct CodegenCx<'ll, 'tcx> {
42 pub tcx: TyCtxt<'tcx>,
43 pub check_overflow: bool,
44 pub use_dll_storage_attrs: bool,
45 pub tls_model: llvm::ThreadLocalMode,
47 pub llmod: &'ll llvm::Module,
48 pub llcx: &'ll llvm::Context,
49 pub codegen_unit: &'tcx CodegenUnit<'tcx>,
51 /// Cache instances of monomorphic and polymorphic items
52 pub instances: RefCell<FxHashMap<Instance<'tcx>, &'ll Value>>,
53 /// Cache generated vtables
55 RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), &'ll Value>>,
56 /// Cache of constant strings,
57 pub const_cstr_cache: RefCell<FxHashMap<Symbol, &'ll Value>>,
59 /// Reverse-direction for const ptrs cast from globals.
61 /// Key is a Value holding a `*T`,
62 /// Val is a Value holding a `*[T]`.
64 /// Needed because LLVM loses pointer->pointee association
65 /// when we ptrcast, and we have to ptrcast during codegen
66 /// of a `[T]` const because we form a slice, a `(*T,usize)` pair, not
67 /// a pointer to an LLVM array type. Similar for trait objects.
68 pub const_unsized: RefCell<FxHashMap<&'ll Value, &'ll Value>>,
70 /// Cache of emitted const globals (value -> global)
71 pub const_globals: RefCell<FxHashMap<&'ll Value, &'ll Value>>,
73 /// List of globals for static variables which need to be passed to the
74 /// LLVM function ReplaceAllUsesWith (RAUW) when codegen is complete.
75 /// (We have to make sure we don't invalidate any Values referring
77 pub statics_to_rauw: RefCell<Vec<(&'ll Value, &'ll Value)>>,
79 /// Statics that will be placed in the llvm.used variable
80 /// See <https://llvm.org/docs/LangRef.html#the-llvm-used-global-variable> for details
81 pub used_statics: RefCell<Vec<&'ll Value>>,
83 /// Statics that will be placed in the llvm.compiler.used variable
84 /// See <https://llvm.org/docs/LangRef.html#the-llvm-compiler-used-global-variable> for details
85 pub compiler_used_statics: RefCell<Vec<&'ll Value>>,
87 /// Mapping of non-scalar types to llvm types and field remapping if needed.
88 pub type_lowering: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), TypeLowering<'ll>>>,
90 /// Mapping of scalar types to llvm types.
91 pub scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, &'ll Type>>,
93 pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>,
94 pub isize_ty: &'ll Type,
96 pub coverage_cx: Option<coverageinfo::CrateCoverageContext<'ll, 'tcx>>,
97 pub dbg_cx: Option<debuginfo::CrateDebugContext<'ll, 'tcx>>,
99 eh_personality: Cell<Option<&'ll Value>>,
100 eh_catch_typeinfo: Cell<Option<&'ll Value>>,
101 pub rust_try_fn: Cell<Option<(&'ll Type, &'ll Value)>>,
103 intrinsics: RefCell<FxHashMap<&'static str, (&'ll Type, &'ll Value)>>,
105 /// A counter that is used for generating local symbol names
106 local_gen_sym_counter: Cell<usize>,
109 pub struct TypeLowering<'ll> {
110 /// Associated LLVM type
111 pub lltype: &'ll Type,
113 /// If padding is used the slice maps fields from source order
115 pub field_remapping: Option<SmallVec<[u32; 4]>>,
118 fn to_llvm_tls_model(tls_model: TlsModel) -> llvm::ThreadLocalMode {
120 TlsModel::GeneralDynamic => llvm::ThreadLocalMode::GeneralDynamic,
121 TlsModel::LocalDynamic => llvm::ThreadLocalMode::LocalDynamic,
122 TlsModel::InitialExec => llvm::ThreadLocalMode::InitialExec,
123 TlsModel::LocalExec => llvm::ThreadLocalMode::LocalExec,
127 pub unsafe fn create_module(
129 llcx: &'ll llvm::Context,
131 ) -> &'ll llvm::Module {
133 let mod_name = SmallCStr::new(mod_name);
134 let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
136 let mut target_data_layout = sess.target.data_layout.clone();
137 if llvm_util::get_version() < (13, 0, 0) {
138 if sess.target.arch == "powerpc64" {
139 target_data_layout = target_data_layout.replace("-S128", "");
141 if sess.target.arch == "wasm32" {
142 target_data_layout = "e-m:e-p:32:32-i64:64-n32:64-S128".to_string();
144 if sess.target.arch == "wasm64" {
145 target_data_layout = "e-m:e-p:64:64-i64:64-n32:64-S128".to_string();
149 // Ensure the data-layout values hardcoded remain the defaults.
150 if sess.target.is_builtin {
151 let tm = crate::back::write::create_informational_target_machine(tcx.sess);
152 llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm);
153 llvm::LLVMRustDisposeTargetMachine(tm);
155 let llvm_data_layout = llvm::LLVMGetDataLayoutStr(llmod);
156 let llvm_data_layout = str::from_utf8(CStr::from_ptr(llvm_data_layout).to_bytes())
157 .expect("got a non-UTF8 data-layout from LLVM");
159 // Unfortunately LLVM target specs change over time, and right now we
160 // don't have proper support to work with any more than one
161 // `data_layout` than the one that is in the rust-lang/rust repo. If
162 // this compiler is configured against a custom LLVM, we may have a
163 // differing data layout, even though we should update our own to use
166 // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we
167 // disable this check entirely as we may be configured with something
168 // that has a different target layout.
170 // Unsure if this will actually cause breakage when rustc is configured
174 let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or("");
175 let custom_llvm_used = cfg_llvm_root.trim() != "";
177 if !custom_llvm_used && target_data_layout != llvm_data_layout {
179 "data-layout for target `{rustc_target}`, `{rustc_layout}`, \
180 differs from LLVM target's `{llvm_target}` default layout, `{llvm_layout}`",
181 rustc_target = sess.opts.target_triple,
182 rustc_layout = target_data_layout,
183 llvm_target = sess.target.llvm_target,
184 llvm_layout = llvm_data_layout
189 let data_layout = SmallCStr::new(&target_data_layout);
190 llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
192 let llvm_target = SmallCStr::new(&sess.target.llvm_target);
193 llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
195 let reloc_model = sess.relocation_model();
196 if matches!(reloc_model, RelocModel::Pic | RelocModel::Pie) {
197 llvm::LLVMRustSetModulePICLevel(llmod);
198 // PIE is potentially more effective than PIC, but can only be used in executables.
199 // If all our outputs are executables, then we can relax PIC to PIE.
200 if reloc_model == RelocModel::Pie
201 || sess.crate_types().iter().all(|ty| *ty == CrateType::Executable)
203 llvm::LLVMRustSetModulePIELevel(llmod);
207 // Linking object files with different code models is undefined behavior
208 // because the compiler would have to generate additional code (to span
209 // longer jumps) if a larger code model is used with a smaller one.
211 // See https://reviews.llvm.org/D52322 and https://reviews.llvm.org/D52323.
212 llvm::LLVMRustSetModuleCodeModel(llmod, to_llvm_code_model(sess.code_model()));
214 // If skipping the PLT is enabled, we need to add some module metadata
215 // to ensure intrinsic calls don't use it.
216 if !sess.needs_plt() {
217 let avoid_plt = "RtLibUseGOT\0".as_ptr().cast();
218 llvm::LLVMRustAddModuleFlag(llmod, avoid_plt, 1);
221 if sess.is_sanitizer_cfi_enabled() {
222 // FIXME(rcvalle): Add support for non canonical jump tables.
223 let canonical_jump_tables = "CFI Canonical Jump Tables\0".as_ptr().cast();
224 // FIXME(rcvalle): Add it with Override behavior flag--LLVMRustAddModuleFlag adds it with
225 // Warning behavior flag. Add support for specifying the behavior flag to
226 // LLVMRustAddModuleFlag.
227 llvm::LLVMRustAddModuleFlag(llmod, canonical_jump_tables, 1);
230 // Control Flow Guard is currently only supported by the MSVC linker on Windows.
231 if sess.target.is_like_msvc {
232 match sess.opts.cg.control_flow_guard {
233 CFGuard::Disabled => {}
234 CFGuard::NoChecks => {
235 // Set `cfguard=1` module flag to emit metadata only.
236 llvm::LLVMRustAddModuleFlag(llmod, "cfguard\0".as_ptr() as *const _, 1)
239 // Set `cfguard=2` module flag to emit metadata and checks.
240 llvm::LLVMRustAddModuleFlag(llmod, "cfguard\0".as_ptr() as *const _, 2)
245 if sess.target.arch == "aarch64" {
246 let BranchProtection { bti, pac_ret: pac } = sess.opts.cg.branch_protection;
248 llvm::LLVMRustAddModuleFlag(
250 "branch-target-enforcement\0".as_ptr().cast(),
254 if let Some(pac_opts) = pac {
255 llvm::LLVMRustAddModuleFlag(llmod, "sign-return-address\0".as_ptr().cast(), 1);
256 llvm::LLVMRustAddModuleFlag(
258 "sign-return-address-all\0".as_ptr().cast(),
259 pac_opts.leaf.into(),
261 llvm::LLVMRustAddModuleFlag(
263 "sign-return-address-with-bkey\0".as_ptr().cast(),
264 if pac_opts.key == PAuthKey::A { 0 } else { 1 },
267 llvm::LLVMRustAddModuleFlag(llmod, "sign-return-address\0".as_ptr().cast(), 0);
268 llvm::LLVMRustAddModuleFlag(llmod, "sign-return-address-all\0".as_ptr().cast(), 0);
269 llvm::LLVMRustAddModuleFlag(
271 "sign-return-address-with-bkey\0".as_ptr().cast(),
280 impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
283 codegen_unit: &'tcx CodegenUnit<'tcx>,
284 llvm_module: &'ll crate::ModuleLlvm,
286 // An interesting part of Windows which MSVC forces our hand on (and
287 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
288 // attributes in LLVM IR as well as native dependencies (in C these
289 // correspond to `__declspec(dllimport)`).
291 // LD (BFD) in MinGW mode can often correctly guess `dllexport` but
292 // relying on that can result in issues like #50176.
293 // LLD won't support that and expects symbols with proper attributes.
294 // Because of that we make MinGW target emit dllexport just like MSVC.
295 // When it comes to dllimport we use it for constants but for functions
296 // rely on the linker to do the right thing. Opposed to dllexport this
297 // task is easy for them (both LD and LLD) and allows us to easily use
298 // symbols from static libraries in shared libraries.
300 // Whenever a dynamic library is built on Windows it must have its public
301 // interface specified by functions tagged with `dllexport` or otherwise
302 // they're not available to be linked against. This poses a few problems
303 // for the compiler, some of which are somewhat fundamental, but we use
304 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
305 // attribute to all LLVM functions that are exported e.g., they're
306 // already tagged with external linkage). This is suboptimal for a few
309 // * If an object file will never be included in a dynamic library,
310 // there's no need to attach the dllexport attribute. Most object
311 // files in Rust are not destined to become part of a dll as binaries
312 // are statically linked by default.
313 // * If the compiler is emitting both an rlib and a dylib, the same
314 // source object file is currently used but with MSVC this may be less
315 // feasible. The compiler may be able to get around this, but it may
316 // involve some invasive changes to deal with this.
318 // The flipside of this situation is that whenever you link to a dll and
319 // you import a function from it, the import should be tagged with
320 // `dllimport`. At this time, however, the compiler does not emit
321 // `dllimport` for any declarations other than constants (where it is
322 // required), which is again suboptimal for even more reasons!
324 // * Calling a function imported from another dll without using
325 // `dllimport` causes the linker/compiler to have extra overhead (one
326 // `jmp` instruction on x86) when calling the function.
327 // * The same object file may be used in different circumstances, so a
328 // function may be imported from a dll if the object is linked into a
329 // dll, but it may be just linked against if linked into an rlib.
330 // * The compiler has no knowledge about whether native functions should
331 // be tagged dllimport or not.
333 // For now the compiler takes the perf hit (I do not have any numbers to
334 // this effect) by marking very little as `dllimport` and praying the
335 // linker will take care of everything. Fixing this problem will likely
336 // require adding a few attributes to Rust itself (feature gated at the
337 // start) and then strongly recommending static linkage on Windows!
338 let use_dll_storage_attrs = tcx.sess.target.is_like_windows;
340 let check_overflow = tcx.sess.overflow_checks();
342 let tls_model = to_llvm_tls_model(tcx.sess.tls_model());
344 let (llcx, llmod) = (&*llvm_module.llcx, llvm_module.llmod());
346 let coverage_cx = if tcx.sess.instrument_coverage() {
347 let covctx = coverageinfo::CrateCoverageContext::new();
353 let dbg_cx = if tcx.sess.opts.debuginfo != DebugInfo::None {
354 let dctx = debuginfo::CrateDebugContext::new(llmod);
355 debuginfo::metadata::compile_unit_metadata(tcx, &codegen_unit.name().as_str(), &dctx);
361 let isize_ty = Type::ix_llcx(llcx, tcx.data_layout.pointer_size.bits());
366 use_dll_storage_attrs,
371 instances: Default::default(),
372 vtables: Default::default(),
373 const_cstr_cache: Default::default(),
374 const_unsized: Default::default(),
375 const_globals: Default::default(),
376 statics_to_rauw: RefCell::new(Vec::new()),
377 used_statics: RefCell::new(Vec::new()),
378 compiler_used_statics: RefCell::new(Vec::new()),
379 type_lowering: Default::default(),
380 scalar_lltypes: Default::default(),
381 pointee_infos: Default::default(),
385 eh_personality: Cell::new(None),
386 eh_catch_typeinfo: Cell::new(None),
387 rust_try_fn: Cell::new(None),
388 intrinsics: Default::default(),
389 local_gen_sym_counter: Cell::new(0),
393 crate fn statics_to_rauw(&self) -> &RefCell<Vec<(&'ll Value, &'ll Value)>> {
394 &self.statics_to_rauw
398 pub fn coverage_context(&'a self) -> Option<&'a coverageinfo::CrateCoverageContext<'ll, 'tcx>> {
399 self.coverage_cx.as_ref()
402 fn create_used_variable_impl(&self, name: &'static CStr, values: &[&'ll Value]) {
403 let section = cstr!("llvm.metadata");
404 let array = self.const_array(self.type_ptr_to(self.type_i8()), values);
407 let g = llvm::LLVMAddGlobal(self.llmod, self.val_ty(array), name.as_ptr());
408 llvm::LLVMSetInitializer(g, array);
409 llvm::LLVMRustSetLinkage(g, llvm::Linkage::AppendingLinkage);
410 llvm::LLVMSetSection(g, section.as_ptr());
415 impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
418 ) -> &RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), &'ll Value>>
423 fn get_fn(&self, instance: Instance<'tcx>) -> &'ll Value {
424 get_fn(self, instance)
427 fn get_fn_addr(&self, instance: Instance<'tcx>) -> &'ll Value {
428 get_fn(self, instance)
431 fn eh_personality(&self) -> &'ll Value {
432 // The exception handling personality function.
434 // If our compilation unit has the `eh_personality` lang item somewhere
435 // within it, then we just need to codegen that. Otherwise, we're
436 // building an rlib which will depend on some upstream implementation of
437 // this function, so we just codegen a generic reference to it. We don't
438 // specify any of the types for the function, we just make it a symbol
439 // that LLVM can later use.
441 // Note that MSVC is a little special here in that we don't use the
442 // `eh_personality` lang item at all. Currently LLVM has support for
443 // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
444 // *name of the personality function* to decide what kind of unwind side
445 // tables/landing pads to emit. It looks like Dwarf is used by default,
446 // injecting a dependency on the `_Unwind_Resume` symbol for resuming
447 // an "exception", but for MSVC we want to force SEH. This means that we
448 // can't actually have the personality function be our standard
449 // `rust_eh_personality` function, but rather we wired it up to the
450 // CRT's custom personality function, which forces LLVM to consider
451 // landing pads as "landing pads for SEH".
452 if let Some(llpersonality) = self.eh_personality.get() {
453 return llpersonality;
456 let llfn = match tcx.lang_items().eh_personality() {
457 Some(def_id) if !wants_msvc_seh(self.sess()) => self.get_fn_addr(
458 ty::Instance::resolve(
460 ty::ParamEnv::reveal_all(),
462 tcx.intern_substs(&[]),
468 let name = if wants_msvc_seh(self.sess()) {
471 "rust_eh_personality"
473 if let Some(llfn) = self.get_declared_value(name) {
476 let fty = self.type_variadic_func(&[], self.type_i32());
477 let llfn = self.declare_cfn(name, llvm::UnnamedAddr::Global, fty);
478 attributes::apply_target_cpu_attr(self, llfn);
483 self.eh_personality.set(Some(llfn));
487 fn sess(&self) -> &Session {
491 fn check_overflow(&self) -> bool {
495 fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
499 fn used_statics(&self) -> &RefCell<Vec<&'ll Value>> {
503 fn compiler_used_statics(&self) -> &RefCell<Vec<&'ll Value>> {
504 &self.compiler_used_statics
507 fn set_frame_pointer_type(&self, llfn: &'ll Value) {
508 attributes::set_frame_pointer_type(self, llfn)
511 fn apply_target_cpu_attr(&self, llfn: &'ll Value) {
512 attributes::apply_target_cpu_attr(self, llfn);
513 attributes::apply_tune_cpu_attr(self, llfn);
516 fn create_used_variable(&self) {
517 self.create_used_variable_impl(cstr!("llvm.used"), &*self.used_statics.borrow());
520 fn create_compiler_used_variable(&self) {
521 self.create_used_variable_impl(
522 cstr!("llvm.compiler.used"),
523 &*self.compiler_used_statics.borrow(),
527 fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
528 if self.get_declared_value("main").is_none() {
529 Some(self.declare_cfn("main", llvm::UnnamedAddr::Global, fn_type))
531 // If the symbol already exists, it is an error: for example, the user wrote
532 // #[no_mangle] extern "C" fn main(..) {..}
533 // instead of #[start]
539 impl CodegenCx<'b, 'tcx> {
540 crate fn get_intrinsic(&self, key: &str) -> (&'b Type, &'b Value) {
541 if let Some(v) = self.intrinsics.borrow().get(key).cloned() {
545 self.declare_intrinsic(key).unwrap_or_else(|| bug!("unknown intrinsic '{}'", key))
551 args: Option<&[&'b llvm::Type]>,
553 ) -> (&'b llvm::Type, &'b llvm::Value) {
554 let fn_ty = if let Some(args) = args {
555 self.type_func(args, ret)
557 self.type_variadic_func(&[], ret)
559 let f = self.declare_cfn(name, llvm::UnnamedAddr::No, fn_ty);
560 self.intrinsics.borrow_mut().insert(name, (fn_ty, f));
564 fn declare_intrinsic(&self, key: &str) -> Option<(&'b Type, &'b Value)> {
566 ($name:expr, fn() -> $ret:expr) => (
568 return Some(self.insert_intrinsic($name, Some(&[]), $ret));
571 ($name:expr, fn(...) -> $ret:expr) => (
573 return Some(self.insert_intrinsic($name, None, $ret));
576 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
578 return Some(self.insert_intrinsic($name, Some(&[$($arg),*]), $ret));
582 macro_rules! mk_struct {
583 ($($field_ty:expr),*) => (self.type_struct( &[$($field_ty),*], false))
586 let i8p = self.type_i8p();
587 let void = self.type_void();
588 let i1 = self.type_i1();
589 let t_i8 = self.type_i8();
590 let t_i16 = self.type_i16();
591 let t_i32 = self.type_i32();
592 let t_i64 = self.type_i64();
593 let t_i128 = self.type_i128();
594 let t_isize = self.type_isize();
595 let t_f32 = self.type_f32();
596 let t_f64 = self.type_f64();
598 ifn!("llvm.wasm.trunc.unsigned.i32.f32", fn(t_f32) -> t_i32);
599 ifn!("llvm.wasm.trunc.unsigned.i32.f64", fn(t_f64) -> t_i32);
600 ifn!("llvm.wasm.trunc.unsigned.i64.f32", fn(t_f32) -> t_i64);
601 ifn!("llvm.wasm.trunc.unsigned.i64.f64", fn(t_f64) -> t_i64);
602 ifn!("llvm.wasm.trunc.signed.i32.f32", fn(t_f32) -> t_i32);
603 ifn!("llvm.wasm.trunc.signed.i32.f64", fn(t_f64) -> t_i32);
604 ifn!("llvm.wasm.trunc.signed.i64.f32", fn(t_f32) -> t_i64);
605 ifn!("llvm.wasm.trunc.signed.i64.f64", fn(t_f64) -> t_i64);
607 ifn!("llvm.fptosi.sat.i8.f32", fn(t_f32) -> t_i8);
608 ifn!("llvm.fptosi.sat.i16.f32", fn(t_f32) -> t_i16);
609 ifn!("llvm.fptosi.sat.i32.f32", fn(t_f32) -> t_i32);
610 ifn!("llvm.fptosi.sat.i64.f32", fn(t_f32) -> t_i64);
611 ifn!("llvm.fptosi.sat.i128.f32", fn(t_f32) -> t_i128);
612 ifn!("llvm.fptosi.sat.i8.f64", fn(t_f64) -> t_i8);
613 ifn!("llvm.fptosi.sat.i16.f64", fn(t_f64) -> t_i16);
614 ifn!("llvm.fptosi.sat.i32.f64", fn(t_f64) -> t_i32);
615 ifn!("llvm.fptosi.sat.i64.f64", fn(t_f64) -> t_i64);
616 ifn!("llvm.fptosi.sat.i128.f64", fn(t_f64) -> t_i128);
618 ifn!("llvm.fptoui.sat.i8.f32", fn(t_f32) -> t_i8);
619 ifn!("llvm.fptoui.sat.i16.f32", fn(t_f32) -> t_i16);
620 ifn!("llvm.fptoui.sat.i32.f32", fn(t_f32) -> t_i32);
621 ifn!("llvm.fptoui.sat.i64.f32", fn(t_f32) -> t_i64);
622 ifn!("llvm.fptoui.sat.i128.f32", fn(t_f32) -> t_i128);
623 ifn!("llvm.fptoui.sat.i8.f64", fn(t_f64) -> t_i8);
624 ifn!("llvm.fptoui.sat.i16.f64", fn(t_f64) -> t_i16);
625 ifn!("llvm.fptoui.sat.i32.f64", fn(t_f64) -> t_i32);
626 ifn!("llvm.fptoui.sat.i64.f64", fn(t_f64) -> t_i64);
627 ifn!("llvm.fptoui.sat.i128.f64", fn(t_f64) -> t_i128);
629 ifn!("llvm.trap", fn() -> void);
630 ifn!("llvm.debugtrap", fn() -> void);
631 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
633 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
634 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
636 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
637 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
639 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
640 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
642 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
643 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
645 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
646 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
648 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
649 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
651 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
652 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
654 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
655 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
657 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
658 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
660 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
661 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
663 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
664 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
666 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
667 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
669 ifn!("llvm.minnum.f32", fn(t_f32, t_f32) -> t_f32);
670 ifn!("llvm.minnum.f64", fn(t_f64, t_f64) -> t_f64);
671 ifn!("llvm.maxnum.f32", fn(t_f32, t_f32) -> t_f32);
672 ifn!("llvm.maxnum.f64", fn(t_f64, t_f64) -> t_f64);
674 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
675 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
677 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
678 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
680 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
681 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
683 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
684 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
685 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
686 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
688 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
689 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
690 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
691 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
693 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
694 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
695 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
696 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
697 ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128);
699 ifn!("llvm.ctlz.i8", fn(t_i8, i1) -> t_i8);
700 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
701 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
702 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
703 ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128);
705 ifn!("llvm.cttz.i8", fn(t_i8, i1) -> t_i8);
706 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
707 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
708 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
709 ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128);
711 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
712 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
713 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
714 ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128);
716 ifn!("llvm.bitreverse.i8", fn(t_i8) -> t_i8);
717 ifn!("llvm.bitreverse.i16", fn(t_i16) -> t_i16);
718 ifn!("llvm.bitreverse.i32", fn(t_i32) -> t_i32);
719 ifn!("llvm.bitreverse.i64", fn(t_i64) -> t_i64);
720 ifn!("llvm.bitreverse.i128", fn(t_i128) -> t_i128);
722 ifn!("llvm.fshl.i8", fn(t_i8, t_i8, t_i8) -> t_i8);
723 ifn!("llvm.fshl.i16", fn(t_i16, t_i16, t_i16) -> t_i16);
724 ifn!("llvm.fshl.i32", fn(t_i32, t_i32, t_i32) -> t_i32);
725 ifn!("llvm.fshl.i64", fn(t_i64, t_i64, t_i64) -> t_i64);
726 ifn!("llvm.fshl.i128", fn(t_i128, t_i128, t_i128) -> t_i128);
728 ifn!("llvm.fshr.i8", fn(t_i8, t_i8, t_i8) -> t_i8);
729 ifn!("llvm.fshr.i16", fn(t_i16, t_i16, t_i16) -> t_i16);
730 ifn!("llvm.fshr.i32", fn(t_i32, t_i32, t_i32) -> t_i32);
731 ifn!("llvm.fshr.i64", fn(t_i64, t_i64, t_i64) -> t_i64);
732 ifn!("llvm.fshr.i128", fn(t_i128, t_i128, t_i128) -> t_i128);
734 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
735 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
736 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
737 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
738 ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
740 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
741 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
742 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
743 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
744 ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
746 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
747 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
748 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
749 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
750 ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
752 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
753 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
754 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
755 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
756 ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
758 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
759 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
760 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
761 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
762 ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
764 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
765 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
766 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
767 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
768 ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
770 ifn!("llvm.sadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
771 ifn!("llvm.sadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
772 ifn!("llvm.sadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
773 ifn!("llvm.sadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
774 ifn!("llvm.sadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
776 ifn!("llvm.uadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
777 ifn!("llvm.uadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
778 ifn!("llvm.uadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
779 ifn!("llvm.uadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
780 ifn!("llvm.uadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
782 ifn!("llvm.ssub.sat.i8", fn(t_i8, t_i8) -> t_i8);
783 ifn!("llvm.ssub.sat.i16", fn(t_i16, t_i16) -> t_i16);
784 ifn!("llvm.ssub.sat.i32", fn(t_i32, t_i32) -> t_i32);
785 ifn!("llvm.ssub.sat.i64", fn(t_i64, t_i64) -> t_i64);
786 ifn!("llvm.ssub.sat.i128", fn(t_i128, t_i128) -> t_i128);
788 ifn!("llvm.usub.sat.i8", fn(t_i8, t_i8) -> t_i8);
789 ifn!("llvm.usub.sat.i16", fn(t_i16, t_i16) -> t_i16);
790 ifn!("llvm.usub.sat.i32", fn(t_i32, t_i32) -> t_i32);
791 ifn!("llvm.usub.sat.i64", fn(t_i64, t_i64) -> t_i64);
792 ifn!("llvm.usub.sat.i128", fn(t_i128, t_i128) -> t_i128);
794 ifn!("llvm.lifetime.start.p0i8", fn(t_i64, i8p) -> void);
795 ifn!("llvm.lifetime.end.p0i8", fn(t_i64, i8p) -> void);
797 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
798 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
799 ifn!("llvm.localescape", fn(...) -> void);
800 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
801 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
803 ifn!("llvm.assume", fn(i1) -> void);
804 ifn!("llvm.prefetch", fn(i8p, t_i32, t_i32, t_i32) -> void);
806 // This isn't an "LLVM intrinsic", but LLVM's optimization passes
807 // recognize it like one and we assume it exists in `core::slice::cmp`
808 ifn!("memcmp", fn(i8p, i8p, t_isize) -> t_i32);
810 // variadic intrinsics
811 ifn!("llvm.va_start", fn(i8p) -> void);
812 ifn!("llvm.va_end", fn(i8p) -> void);
813 ifn!("llvm.va_copy", fn(i8p, i8p) -> void);
815 if self.sess().instrument_coverage() {
816 ifn!("llvm.instrprof.increment", fn(i8p, t_i64, t_i32, t_i32) -> void);
819 ifn!("llvm.type.test", fn(i8p, self.type_metadata()) -> i1);
821 if self.sess().opts.debuginfo != DebugInfo::None {
822 ifn!("llvm.dbg.declare", fn(self.type_metadata(), self.type_metadata()) -> void);
823 ifn!("llvm.dbg.value", fn(self.type_metadata(), t_i64, self.type_metadata()) -> void);
828 crate fn eh_catch_typeinfo(&self) -> &'b Value {
829 if let Some(eh_catch_typeinfo) = self.eh_catch_typeinfo.get() {
830 return eh_catch_typeinfo;
833 assert!(self.sess().target.is_like_emscripten);
834 let eh_catch_typeinfo = match tcx.lang_items().eh_catch_typeinfo() {
835 Some(def_id) => self.get_static(def_id),
838 .type_struct(&[self.type_ptr_to(self.type_isize()), self.type_i8p()], false);
839 self.declare_global("rust_eh_catch_typeinfo", ty)
842 let eh_catch_typeinfo = self.const_bitcast(eh_catch_typeinfo, self.type_i8p());
843 self.eh_catch_typeinfo.set(Some(eh_catch_typeinfo));
848 impl<'b, 'tcx> CodegenCx<'b, 'tcx> {
849 /// Generates a new symbol name with the given prefix. This symbol name must
850 /// only be used for definitions with `internal` or `private` linkage.
851 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
852 let idx = self.local_gen_sym_counter.get();
853 self.local_gen_sym_counter.set(idx + 1);
854 // Include a '.' character, so there can be no accidental conflicts with
855 // user defined names
856 let mut name = String::with_capacity(prefix.len() + 6);
857 name.push_str(prefix);
859 base_n::push_str(idx as u128, base_n::ALPHANUMERIC_ONLY, &mut name);
864 impl HasDataLayout for CodegenCx<'ll, 'tcx> {
866 fn data_layout(&self) -> &TargetDataLayout {
867 &self.tcx.data_layout
871 impl HasTargetSpec for CodegenCx<'ll, 'tcx> {
873 fn target_spec(&self) -> &Target {
874 &self.tcx.sess.target
878 impl ty::layout::HasTyCtxt<'tcx> for CodegenCx<'ll, 'tcx> {
880 fn tcx(&self) -> TyCtxt<'tcx> {
885 impl<'tcx, 'll> HasParamEnv<'tcx> for CodegenCx<'ll, 'tcx> {
886 fn param_env(&self) -> ty::ParamEnv<'tcx> {
887 ty::ParamEnv::reveal_all()
891 impl LayoutOfHelpers<'tcx> for CodegenCx<'ll, 'tcx> {
892 type LayoutOfResult = TyAndLayout<'tcx>;
895 fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
896 if let LayoutError::SizeOverflow(_) = err {
897 self.sess().span_fatal(span, &err.to_string())
899 span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
904 impl FnAbiOfHelpers<'tcx> for CodegenCx<'ll, 'tcx> {
905 type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;
908 fn handle_fn_abi_err(
910 err: FnAbiError<'tcx>,
912 fn_abi_request: FnAbiRequest<'tcx>,
914 if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err {
915 self.sess().span_fatal(span, &err.to_string())
917 match fn_abi_request {
918 FnAbiRequest::OfFnPtr { sig, extra_args } => {
921 "`fn_abi_of_fn_ptr({}, {:?})` failed: {}",
927 FnAbiRequest::OfInstance { instance, extra_args } => {
930 "`fn_abi_of_instance({}, {:?})` failed: {}",