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::{CFGuard, CrateType, DebugInfo};
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)
248 impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
251 codegen_unit: &'tcx CodegenUnit<'tcx>,
252 llvm_module: &'ll crate::ModuleLlvm,
254 // An interesting part of Windows which MSVC forces our hand on (and
255 // apparently MinGW didn't) is the usage of `dllimport` and `dllexport`
256 // attributes in LLVM IR as well as native dependencies (in C these
257 // correspond to `__declspec(dllimport)`).
259 // LD (BFD) in MinGW mode can often correctly guess `dllexport` but
260 // relying on that can result in issues like #50176.
261 // LLD won't support that and expects symbols with proper attributes.
262 // Because of that we make MinGW target emit dllexport just like MSVC.
263 // When it comes to dllimport we use it for constants but for functions
264 // rely on the linker to do the right thing. Opposed to dllexport this
265 // task is easy for them (both LD and LLD) and allows us to easily use
266 // symbols from static libraries in shared libraries.
268 // Whenever a dynamic library is built on Windows it must have its public
269 // interface specified by functions tagged with `dllexport` or otherwise
270 // they're not available to be linked against. This poses a few problems
271 // for the compiler, some of which are somewhat fundamental, but we use
272 // the `use_dll_storage_attrs` variable below to attach the `dllexport`
273 // attribute to all LLVM functions that are exported e.g., they're
274 // already tagged with external linkage). This is suboptimal for a few
277 // * If an object file will never be included in a dynamic library,
278 // there's no need to attach the dllexport attribute. Most object
279 // files in Rust are not destined to become part of a dll as binaries
280 // are statically linked by default.
281 // * If the compiler is emitting both an rlib and a dylib, the same
282 // source object file is currently used but with MSVC this may be less
283 // feasible. The compiler may be able to get around this, but it may
284 // involve some invasive changes to deal with this.
286 // The flipside of this situation is that whenever you link to a dll and
287 // you import a function from it, the import should be tagged with
288 // `dllimport`. At this time, however, the compiler does not emit
289 // `dllimport` for any declarations other than constants (where it is
290 // required), which is again suboptimal for even more reasons!
292 // * Calling a function imported from another dll without using
293 // `dllimport` causes the linker/compiler to have extra overhead (one
294 // `jmp` instruction on x86) when calling the function.
295 // * The same object file may be used in different circumstances, so a
296 // function may be imported from a dll if the object is linked into a
297 // dll, but it may be just linked against if linked into an rlib.
298 // * The compiler has no knowledge about whether native functions should
299 // be tagged dllimport or not.
301 // For now the compiler takes the perf hit (I do not have any numbers to
302 // this effect) by marking very little as `dllimport` and praying the
303 // linker will take care of everything. Fixing this problem will likely
304 // require adding a few attributes to Rust itself (feature gated at the
305 // start) and then strongly recommending static linkage on Windows!
306 let use_dll_storage_attrs = tcx.sess.target.is_like_windows;
308 let check_overflow = tcx.sess.overflow_checks();
310 let tls_model = to_llvm_tls_model(tcx.sess.tls_model());
312 let (llcx, llmod) = (&*llvm_module.llcx, llvm_module.llmod());
314 let coverage_cx = if tcx.sess.instrument_coverage() {
315 let covctx = coverageinfo::CrateCoverageContext::new();
321 let dbg_cx = if tcx.sess.opts.debuginfo != DebugInfo::None {
322 let dctx = debuginfo::CrateDebugContext::new(llmod);
323 debuginfo::metadata::compile_unit_metadata(tcx, &codegen_unit.name().as_str(), &dctx);
329 let isize_ty = Type::ix_llcx(llcx, tcx.data_layout.pointer_size.bits());
334 use_dll_storage_attrs,
339 instances: Default::default(),
340 vtables: Default::default(),
341 const_cstr_cache: Default::default(),
342 const_unsized: Default::default(),
343 const_globals: Default::default(),
344 statics_to_rauw: RefCell::new(Vec::new()),
345 used_statics: RefCell::new(Vec::new()),
346 compiler_used_statics: RefCell::new(Vec::new()),
347 type_lowering: Default::default(),
348 scalar_lltypes: Default::default(),
349 pointee_infos: Default::default(),
353 eh_personality: Cell::new(None),
354 eh_catch_typeinfo: Cell::new(None),
355 rust_try_fn: Cell::new(None),
356 intrinsics: Default::default(),
357 local_gen_sym_counter: Cell::new(0),
361 crate fn statics_to_rauw(&self) -> &RefCell<Vec<(&'ll Value, &'ll Value)>> {
362 &self.statics_to_rauw
366 pub fn coverage_context(&'a self) -> Option<&'a coverageinfo::CrateCoverageContext<'ll, 'tcx>> {
367 self.coverage_cx.as_ref()
370 fn create_used_variable_impl(&self, name: &'static CStr, values: &[&'ll Value]) {
371 let section = cstr!("llvm.metadata");
372 let array = self.const_array(self.type_ptr_to(self.type_i8()), values);
375 let g = llvm::LLVMAddGlobal(self.llmod, self.val_ty(array), name.as_ptr());
376 llvm::LLVMSetInitializer(g, array);
377 llvm::LLVMRustSetLinkage(g, llvm::Linkage::AppendingLinkage);
378 llvm::LLVMSetSection(g, section.as_ptr());
383 impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
386 ) -> &RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), &'ll Value>>
391 fn get_fn(&self, instance: Instance<'tcx>) -> &'ll Value {
392 get_fn(self, instance)
395 fn get_fn_addr(&self, instance: Instance<'tcx>) -> &'ll Value {
396 get_fn(self, instance)
399 fn eh_personality(&self) -> &'ll Value {
400 // The exception handling personality function.
402 // If our compilation unit has the `eh_personality` lang item somewhere
403 // within it, then we just need to codegen that. Otherwise, we're
404 // building an rlib which will depend on some upstream implementation of
405 // this function, so we just codegen a generic reference to it. We don't
406 // specify any of the types for the function, we just make it a symbol
407 // that LLVM can later use.
409 // Note that MSVC is a little special here in that we don't use the
410 // `eh_personality` lang item at all. Currently LLVM has support for
411 // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
412 // *name of the personality function* to decide what kind of unwind side
413 // tables/landing pads to emit. It looks like Dwarf is used by default,
414 // injecting a dependency on the `_Unwind_Resume` symbol for resuming
415 // an "exception", but for MSVC we want to force SEH. This means that we
416 // can't actually have the personality function be our standard
417 // `rust_eh_personality` function, but rather we wired it up to the
418 // CRT's custom personality function, which forces LLVM to consider
419 // landing pads as "landing pads for SEH".
420 if let Some(llpersonality) = self.eh_personality.get() {
421 return llpersonality;
424 let llfn = match tcx.lang_items().eh_personality() {
425 Some(def_id) if !wants_msvc_seh(self.sess()) => self.get_fn_addr(
426 ty::Instance::resolve(
428 ty::ParamEnv::reveal_all(),
430 tcx.intern_substs(&[]),
436 let name = if wants_msvc_seh(self.sess()) {
439 "rust_eh_personality"
441 if let Some(llfn) = self.get_declared_value(name) {
444 let fty = self.type_variadic_func(&[], self.type_i32());
445 let llfn = self.declare_cfn(name, llvm::UnnamedAddr::Global, fty);
446 attributes::apply_target_cpu_attr(self, llfn);
451 self.eh_personality.set(Some(llfn));
455 fn sess(&self) -> &Session {
459 fn check_overflow(&self) -> bool {
463 fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
467 fn used_statics(&self) -> &RefCell<Vec<&'ll Value>> {
471 fn compiler_used_statics(&self) -> &RefCell<Vec<&'ll Value>> {
472 &self.compiler_used_statics
475 fn set_frame_pointer_type(&self, llfn: &'ll Value) {
476 attributes::set_frame_pointer_type(self, llfn)
479 fn apply_target_cpu_attr(&self, llfn: &'ll Value) {
480 attributes::apply_target_cpu_attr(self, llfn);
481 attributes::apply_tune_cpu_attr(self, llfn);
484 fn create_used_variable(&self) {
485 self.create_used_variable_impl(cstr!("llvm.used"), &*self.used_statics.borrow());
488 fn create_compiler_used_variable(&self) {
489 self.create_used_variable_impl(
490 cstr!("llvm.compiler.used"),
491 &*self.compiler_used_statics.borrow(),
495 fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
496 if self.get_declared_value("main").is_none() {
497 Some(self.declare_cfn("main", llvm::UnnamedAddr::Global, fn_type))
499 // If the symbol already exists, it is an error: for example, the user wrote
500 // #[no_mangle] extern "C" fn main(..) {..}
501 // instead of #[start]
507 impl CodegenCx<'b, 'tcx> {
508 crate fn get_intrinsic(&self, key: &str) -> (&'b Type, &'b Value) {
509 if let Some(v) = self.intrinsics.borrow().get(key).cloned() {
513 self.declare_intrinsic(key).unwrap_or_else(|| bug!("unknown intrinsic '{}'", key))
519 args: Option<&[&'b llvm::Type]>,
521 ) -> (&'b llvm::Type, &'b llvm::Value) {
522 let fn_ty = if let Some(args) = args {
523 self.type_func(args, ret)
525 self.type_variadic_func(&[], ret)
527 let f = self.declare_cfn(name, llvm::UnnamedAddr::No, fn_ty);
528 self.intrinsics.borrow_mut().insert(name, (fn_ty, f));
532 fn declare_intrinsic(&self, key: &str) -> Option<(&'b Type, &'b Value)> {
534 ($name:expr, fn() -> $ret:expr) => (
536 return Some(self.insert_intrinsic($name, Some(&[]), $ret));
539 ($name:expr, fn(...) -> $ret:expr) => (
541 return Some(self.insert_intrinsic($name, None, $ret));
544 ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
546 return Some(self.insert_intrinsic($name, Some(&[$($arg),*]), $ret));
550 macro_rules! mk_struct {
551 ($($field_ty:expr),*) => (self.type_struct( &[$($field_ty),*], false))
554 let i8p = self.type_i8p();
555 let void = self.type_void();
556 let i1 = self.type_i1();
557 let t_i8 = self.type_i8();
558 let t_i16 = self.type_i16();
559 let t_i32 = self.type_i32();
560 let t_i64 = self.type_i64();
561 let t_i128 = self.type_i128();
562 let t_isize = self.type_isize();
563 let t_f32 = self.type_f32();
564 let t_f64 = self.type_f64();
566 ifn!("llvm.wasm.trunc.unsigned.i32.f32", fn(t_f32) -> t_i32);
567 ifn!("llvm.wasm.trunc.unsigned.i32.f64", fn(t_f64) -> t_i32);
568 ifn!("llvm.wasm.trunc.unsigned.i64.f32", fn(t_f32) -> t_i64);
569 ifn!("llvm.wasm.trunc.unsigned.i64.f64", fn(t_f64) -> t_i64);
570 ifn!("llvm.wasm.trunc.signed.i32.f32", fn(t_f32) -> t_i32);
571 ifn!("llvm.wasm.trunc.signed.i32.f64", fn(t_f64) -> t_i32);
572 ifn!("llvm.wasm.trunc.signed.i64.f32", fn(t_f32) -> t_i64);
573 ifn!("llvm.wasm.trunc.signed.i64.f64", fn(t_f64) -> t_i64);
575 ifn!("llvm.fptosi.sat.i8.f32", fn(t_f32) -> t_i8);
576 ifn!("llvm.fptosi.sat.i16.f32", fn(t_f32) -> t_i16);
577 ifn!("llvm.fptosi.sat.i32.f32", fn(t_f32) -> t_i32);
578 ifn!("llvm.fptosi.sat.i64.f32", fn(t_f32) -> t_i64);
579 ifn!("llvm.fptosi.sat.i128.f32", fn(t_f32) -> t_i128);
580 ifn!("llvm.fptosi.sat.i8.f64", fn(t_f64) -> t_i8);
581 ifn!("llvm.fptosi.sat.i16.f64", fn(t_f64) -> t_i16);
582 ifn!("llvm.fptosi.sat.i32.f64", fn(t_f64) -> t_i32);
583 ifn!("llvm.fptosi.sat.i64.f64", fn(t_f64) -> t_i64);
584 ifn!("llvm.fptosi.sat.i128.f64", fn(t_f64) -> t_i128);
586 ifn!("llvm.fptoui.sat.i8.f32", fn(t_f32) -> t_i8);
587 ifn!("llvm.fptoui.sat.i16.f32", fn(t_f32) -> t_i16);
588 ifn!("llvm.fptoui.sat.i32.f32", fn(t_f32) -> t_i32);
589 ifn!("llvm.fptoui.sat.i64.f32", fn(t_f32) -> t_i64);
590 ifn!("llvm.fptoui.sat.i128.f32", fn(t_f32) -> t_i128);
591 ifn!("llvm.fptoui.sat.i8.f64", fn(t_f64) -> t_i8);
592 ifn!("llvm.fptoui.sat.i16.f64", fn(t_f64) -> t_i16);
593 ifn!("llvm.fptoui.sat.i32.f64", fn(t_f64) -> t_i32);
594 ifn!("llvm.fptoui.sat.i64.f64", fn(t_f64) -> t_i64);
595 ifn!("llvm.fptoui.sat.i128.f64", fn(t_f64) -> t_i128);
597 ifn!("llvm.trap", fn() -> void);
598 ifn!("llvm.debugtrap", fn() -> void);
599 ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
601 ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
602 ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
604 ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
605 ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
607 ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
608 ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
610 ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
611 ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
613 ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
614 ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
616 ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
617 ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
619 ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
620 ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
622 ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
623 ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
625 ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
626 ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
628 ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
629 ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
631 ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
632 ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
634 ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
635 ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
637 ifn!("llvm.minnum.f32", fn(t_f32, t_f32) -> t_f32);
638 ifn!("llvm.minnum.f64", fn(t_f64, t_f64) -> t_f64);
639 ifn!("llvm.maxnum.f32", fn(t_f32, t_f32) -> t_f32);
640 ifn!("llvm.maxnum.f64", fn(t_f64, t_f64) -> t_f64);
642 ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
643 ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
645 ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
646 ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
648 ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
649 ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
651 ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32);
652 ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64);
653 ifn!("llvm.round.f32", fn(t_f32) -> t_f32);
654 ifn!("llvm.round.f64", fn(t_f64) -> t_f64);
656 ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
657 ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
658 ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
659 ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
661 ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
662 ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
663 ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
664 ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
665 ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128);
667 ifn!("llvm.ctlz.i8", fn(t_i8, i1) -> t_i8);
668 ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
669 ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
670 ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
671 ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128);
673 ifn!("llvm.cttz.i8", fn(t_i8, i1) -> t_i8);
674 ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
675 ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
676 ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
677 ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128);
679 ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
680 ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
681 ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
682 ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128);
684 ifn!("llvm.bitreverse.i8", fn(t_i8) -> t_i8);
685 ifn!("llvm.bitreverse.i16", fn(t_i16) -> t_i16);
686 ifn!("llvm.bitreverse.i32", fn(t_i32) -> t_i32);
687 ifn!("llvm.bitreverse.i64", fn(t_i64) -> t_i64);
688 ifn!("llvm.bitreverse.i128", fn(t_i128) -> t_i128);
690 ifn!("llvm.fshl.i8", fn(t_i8, t_i8, t_i8) -> t_i8);
691 ifn!("llvm.fshl.i16", fn(t_i16, t_i16, t_i16) -> t_i16);
692 ifn!("llvm.fshl.i32", fn(t_i32, t_i32, t_i32) -> t_i32);
693 ifn!("llvm.fshl.i64", fn(t_i64, t_i64, t_i64) -> t_i64);
694 ifn!("llvm.fshl.i128", fn(t_i128, t_i128, t_i128) -> t_i128);
696 ifn!("llvm.fshr.i8", fn(t_i8, t_i8, t_i8) -> t_i8);
697 ifn!("llvm.fshr.i16", fn(t_i16, t_i16, t_i16) -> t_i16);
698 ifn!("llvm.fshr.i32", fn(t_i32, t_i32, t_i32) -> t_i32);
699 ifn!("llvm.fshr.i64", fn(t_i64, t_i64, t_i64) -> t_i64);
700 ifn!("llvm.fshr.i128", fn(t_i128, t_i128, t_i128) -> t_i128);
702 ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
703 ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
704 ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
705 ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
706 ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
708 ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
709 ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
710 ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
711 ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
712 ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
714 ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
715 ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
716 ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
717 ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
718 ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
720 ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
721 ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
722 ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
723 ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
724 ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
726 ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
727 ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
728 ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
729 ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
730 ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
732 ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct! {t_i8, i1});
733 ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct! {t_i16, i1});
734 ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct! {t_i32, i1});
735 ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct! {t_i64, i1});
736 ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct! {t_i128, i1});
738 ifn!("llvm.sadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
739 ifn!("llvm.sadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
740 ifn!("llvm.sadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
741 ifn!("llvm.sadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
742 ifn!("llvm.sadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
744 ifn!("llvm.uadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
745 ifn!("llvm.uadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
746 ifn!("llvm.uadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
747 ifn!("llvm.uadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
748 ifn!("llvm.uadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
750 ifn!("llvm.ssub.sat.i8", fn(t_i8, t_i8) -> t_i8);
751 ifn!("llvm.ssub.sat.i16", fn(t_i16, t_i16) -> t_i16);
752 ifn!("llvm.ssub.sat.i32", fn(t_i32, t_i32) -> t_i32);
753 ifn!("llvm.ssub.sat.i64", fn(t_i64, t_i64) -> t_i64);
754 ifn!("llvm.ssub.sat.i128", fn(t_i128, t_i128) -> t_i128);
756 ifn!("llvm.usub.sat.i8", fn(t_i8, t_i8) -> t_i8);
757 ifn!("llvm.usub.sat.i16", fn(t_i16, t_i16) -> t_i16);
758 ifn!("llvm.usub.sat.i32", fn(t_i32, t_i32) -> t_i32);
759 ifn!("llvm.usub.sat.i64", fn(t_i64, t_i64) -> t_i64);
760 ifn!("llvm.usub.sat.i128", fn(t_i128, t_i128) -> t_i128);
762 ifn!("llvm.lifetime.start.p0i8", fn(t_i64, i8p) -> void);
763 ifn!("llvm.lifetime.end.p0i8", fn(t_i64, i8p) -> void);
765 ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
766 ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32);
767 ifn!("llvm.localescape", fn(...) -> void);
768 ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p);
769 ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p);
771 ifn!("llvm.assume", fn(i1) -> void);
772 ifn!("llvm.prefetch", fn(i8p, t_i32, t_i32, t_i32) -> void);
774 // This isn't an "LLVM intrinsic", but LLVM's optimization passes
775 // recognize it like one and we assume it exists in `core::slice::cmp`
776 ifn!("memcmp", fn(i8p, i8p, t_isize) -> t_i32);
778 // variadic intrinsics
779 ifn!("llvm.va_start", fn(i8p) -> void);
780 ifn!("llvm.va_end", fn(i8p) -> void);
781 ifn!("llvm.va_copy", fn(i8p, i8p) -> void);
783 if self.sess().instrument_coverage() {
784 ifn!("llvm.instrprof.increment", fn(i8p, t_i64, t_i32, t_i32) -> void);
787 ifn!("llvm.type.test", fn(i8p, self.type_metadata()) -> i1);
789 if self.sess().opts.debuginfo != DebugInfo::None {
790 ifn!("llvm.dbg.declare", fn(self.type_metadata(), self.type_metadata()) -> void);
791 ifn!("llvm.dbg.value", fn(self.type_metadata(), t_i64, self.type_metadata()) -> void);
796 crate fn eh_catch_typeinfo(&self) -> &'b Value {
797 if let Some(eh_catch_typeinfo) = self.eh_catch_typeinfo.get() {
798 return eh_catch_typeinfo;
801 assert!(self.sess().target.is_like_emscripten);
802 let eh_catch_typeinfo = match tcx.lang_items().eh_catch_typeinfo() {
803 Some(def_id) => self.get_static(def_id),
806 .type_struct(&[self.type_ptr_to(self.type_isize()), self.type_i8p()], false);
807 self.declare_global("rust_eh_catch_typeinfo", ty)
810 let eh_catch_typeinfo = self.const_bitcast(eh_catch_typeinfo, self.type_i8p());
811 self.eh_catch_typeinfo.set(Some(eh_catch_typeinfo));
816 impl<'b, 'tcx> CodegenCx<'b, 'tcx> {
817 /// Generates a new symbol name with the given prefix. This symbol name must
818 /// only be used for definitions with `internal` or `private` linkage.
819 pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
820 let idx = self.local_gen_sym_counter.get();
821 self.local_gen_sym_counter.set(idx + 1);
822 // Include a '.' character, so there can be no accidental conflicts with
823 // user defined names
824 let mut name = String::with_capacity(prefix.len() + 6);
825 name.push_str(prefix);
827 base_n::push_str(idx as u128, base_n::ALPHANUMERIC_ONLY, &mut name);
832 impl HasDataLayout for CodegenCx<'ll, 'tcx> {
834 fn data_layout(&self) -> &TargetDataLayout {
835 &self.tcx.data_layout
839 impl HasTargetSpec for CodegenCx<'ll, 'tcx> {
841 fn target_spec(&self) -> &Target {
842 &self.tcx.sess.target
846 impl ty::layout::HasTyCtxt<'tcx> for CodegenCx<'ll, 'tcx> {
848 fn tcx(&self) -> TyCtxt<'tcx> {
853 impl<'tcx, 'll> HasParamEnv<'tcx> for CodegenCx<'ll, 'tcx> {
854 fn param_env(&self) -> ty::ParamEnv<'tcx> {
855 ty::ParamEnv::reveal_all()
859 impl LayoutOfHelpers<'tcx> for CodegenCx<'ll, 'tcx> {
860 type LayoutOfResult = TyAndLayout<'tcx>;
863 fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
864 if let LayoutError::SizeOverflow(_) = err {
865 self.sess().span_fatal(span, &err.to_string())
867 span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
872 impl FnAbiOfHelpers<'tcx> for CodegenCx<'ll, 'tcx> {
873 type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;
876 fn handle_fn_abi_err(
878 err: FnAbiError<'tcx>,
880 fn_abi_request: FnAbiRequest<'tcx>,
882 if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err {
883 self.sess().span_fatal(span, &err.to_string())
885 match fn_abi_request {
886 FnAbiRequest::OfFnPtr { sig, extra_args } => {
889 "`fn_abi_of_fn_ptr({}, {:?})` failed: {}",
895 FnAbiRequest::OfInstance { instance, extra_args } => {
898 "`fn_abi_of_instance({}, {:?})` failed: {}",