| // Copyright 2013 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use common; |
| use llvm; |
| use llvm::{ContextRef, ModuleRef, ValueRef}; |
| use rustc::dep_graph::{DepGraph, DepGraphSafe}; |
| use rustc::hir; |
| use rustc::hir::def_id::DefId; |
| use rustc::ich::StableHashingContext; |
| use rustc::traits; |
| use debuginfo; |
| use callee; |
| use base; |
| use declare; |
| use monomorphize::Instance; |
| |
| use monomorphize::partitioning::CodegenUnit; |
| use type_::Type; |
| use type_of::PointeeInfo; |
| |
| use rustc_data_structures::base_n; |
| use rustc::mir::mono::Stats; |
| use rustc_data_structures::stable_hasher::StableHashingContextProvider; |
| use rustc::session::config::{self, NoDebugInfo}; |
| use rustc::session::Session; |
| use rustc::ty::layout::{LayoutError, LayoutOf, Size, TyLayout}; |
| use rustc::ty::{self, Ty, TyCtxt}; |
| use rustc::util::nodemap::FxHashMap; |
| |
| use std::ffi::{CStr, CString}; |
| use std::cell::{Cell, RefCell}; |
| use std::ptr; |
| use std::iter; |
| use std::str; |
| use std::sync::Arc; |
| use std::marker::PhantomData; |
| use syntax::symbol::InternedString; |
| use abi::Abi; |
| |
| /// The shared portion of a `CrateContext`. There is one `SharedCrateContext` |
| /// per crate. The data here is shared between all compilation units of the |
| /// crate, so it must not contain references to any LLVM data structures |
| /// (aside from metadata-related ones). |
| pub struct SharedCrateContext<'a, 'tcx: 'a> { |
| tcx: TyCtxt<'a, 'tcx, 'tcx>, |
| check_overflow: bool, |
| use_dll_storage_attrs: bool, |
| tls_model: llvm::ThreadLocalMode, |
| } |
| |
| /// The local portion of a `CrateContext`. There is one `LocalCrateContext` |
| /// per compilation unit. Each one has its own LLVM `ContextRef` so that |
| /// several compilation units may be optimized in parallel. All other LLVM |
| /// data structures in the `LocalCrateContext` are tied to that `ContextRef`. |
| pub struct LocalCrateContext<'a, 'tcx: 'a> { |
| llmod: ModuleRef, |
| llcx: ContextRef, |
| stats: RefCell<Stats>, |
| codegen_unit: Arc<CodegenUnit<'tcx>>, |
| |
| /// Cache instances of monomorphic and polymorphic items |
| instances: RefCell<FxHashMap<Instance<'tcx>, ValueRef>>, |
| /// Cache generated vtables |
| vtables: RefCell<FxHashMap<(Ty<'tcx>, |
| Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>>, |
| /// Cache of constant strings, |
| const_cstr_cache: RefCell<FxHashMap<InternedString, ValueRef>>, |
| |
| /// Reverse-direction for const ptrs cast from globals. |
| /// Key is a ValueRef holding a *T, |
| /// Val is a ValueRef holding a *[T]. |
| /// |
| /// Needed because LLVM loses pointer->pointee association |
| /// when we ptrcast, and we have to ptrcast during translation |
| /// of a [T] const because we form a slice, a (*T,usize) pair, not |
| /// a pointer to an LLVM array type. Similar for trait objects. |
| const_unsized: RefCell<FxHashMap<ValueRef, ValueRef>>, |
| |
| /// Cache of emitted const globals (value -> global) |
| const_globals: RefCell<FxHashMap<ValueRef, ValueRef>>, |
| |
| /// Mapping from static definitions to their DefId's. |
| statics: RefCell<FxHashMap<ValueRef, DefId>>, |
| |
| /// List of globals for static variables which need to be passed to the |
| /// LLVM function ReplaceAllUsesWith (RAUW) when translation is complete. |
| /// (We have to make sure we don't invalidate any ValueRefs referring |
| /// to constants.) |
| statics_to_rauw: RefCell<Vec<(ValueRef, ValueRef)>>, |
| |
| /// Statics that will be placed in the llvm.used variable |
| /// See http://llvm.org/docs/LangRef.html#the-llvm-used-global-variable for details |
| used_statics: RefCell<Vec<ValueRef>>, |
| |
| lltypes: RefCell<FxHashMap<(Ty<'tcx>, Option<usize>), Type>>, |
| scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, Type>>, |
| pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>, |
| isize_ty: Type, |
| |
| dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>, |
| |
| eh_personality: Cell<Option<ValueRef>>, |
| eh_unwind_resume: Cell<Option<ValueRef>>, |
| rust_try_fn: Cell<Option<ValueRef>>, |
| |
| intrinsics: RefCell<FxHashMap<&'static str, ValueRef>>, |
| |
| /// A counter that is used for generating local symbol names |
| local_gen_sym_counter: Cell<usize>, |
| |
| /// A placeholder so we can add lifetimes |
| placeholder: PhantomData<&'a ()>, |
| } |
| |
| /// A CrateContext value binds together one LocalCrateContext with the |
| /// SharedCrateContext. It exists as a convenience wrapper, so we don't have to |
| /// pass around (SharedCrateContext, LocalCrateContext) tuples all over trans. |
| pub struct CrateContext<'a, 'tcx: 'a> { |
| shared: &'a SharedCrateContext<'a, 'tcx>, |
| local_ccx: &'a LocalCrateContext<'a, 'tcx>, |
| } |
| |
| impl<'a, 'tcx> CrateContext<'a, 'tcx> { |
| pub fn new(shared: &'a SharedCrateContext<'a, 'tcx>, |
| local_ccx: &'a LocalCrateContext<'a, 'tcx>) |
| -> Self { |
| CrateContext { shared, local_ccx } |
| } |
| } |
| |
| impl<'a, 'tcx> DepGraphSafe for CrateContext<'a, 'tcx> { |
| } |
| |
| impl<'a, 'tcx> DepGraphSafe for SharedCrateContext<'a, 'tcx> { |
| } |
| |
| impl<'a, 'tcx> StableHashingContextProvider for SharedCrateContext<'a, 'tcx> { |
| type ContextType = StableHashingContext<'tcx>; |
| |
| fn create_stable_hashing_context(&self) -> Self::ContextType { |
| self.tcx.create_stable_hashing_context() |
| } |
| } |
| |
| pub fn get_reloc_model(sess: &Session) -> llvm::RelocMode { |
| let reloc_model_arg = match sess.opts.cg.relocation_model { |
| Some(ref s) => &s[..], |
| None => &sess.target.target.options.relocation_model[..], |
| }; |
| |
| match ::back::write::RELOC_MODEL_ARGS.iter().find( |
| |&&arg| arg.0 == reloc_model_arg) { |
| Some(x) => x.1, |
| _ => { |
| sess.err(&format!("{:?} is not a valid relocation mode", |
| reloc_model_arg)); |
| sess.abort_if_errors(); |
| bug!(); |
| } |
| } |
| } |
| |
| fn get_tls_model(sess: &Session) -> llvm::ThreadLocalMode { |
| let tls_model_arg = match sess.opts.debugging_opts.tls_model { |
| Some(ref s) => &s[..], |
| None => &sess.target.target.options.tls_model[..], |
| }; |
| |
| match ::back::write::TLS_MODEL_ARGS.iter().find( |
| |&&arg| arg.0 == tls_model_arg) { |
| Some(x) => x.1, |
| _ => { |
| sess.err(&format!("{:?} is not a valid TLS model", |
| tls_model_arg)); |
| sess.abort_if_errors(); |
| bug!(); |
| } |
| } |
| } |
| |
| fn is_any_library(sess: &Session) -> bool { |
| sess.crate_types.borrow().iter().any(|ty| { |
| *ty != config::CrateTypeExecutable |
| }) |
| } |
| |
| pub fn is_pie_binary(sess: &Session) -> bool { |
| !is_any_library(sess) && get_reloc_model(sess) == llvm::RelocMode::PIC |
| } |
| |
| pub unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) { |
| let llcx = llvm::LLVMRustContextCreate(sess.fewer_names()); |
| let mod_name = CString::new(mod_name).unwrap(); |
| let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx); |
| |
| // Ensure the data-layout values hardcoded remain the defaults. |
| if sess.target.target.options.is_builtin { |
| let tm = ::back::write::create_target_machine(sess); |
| llvm::LLVMRustSetDataLayoutFromTargetMachine(llmod, tm); |
| llvm::LLVMRustDisposeTargetMachine(tm); |
| |
| let data_layout = llvm::LLVMGetDataLayout(llmod); |
| let data_layout = str::from_utf8(CStr::from_ptr(data_layout).to_bytes()) |
| .ok().expect("got a non-UTF8 data-layout from LLVM"); |
| |
| // Unfortunately LLVM target specs change over time, and right now we |
| // don't have proper support to work with any more than one |
| // `data_layout` than the one that is in the rust-lang/rust repo. If |
| // this compiler is configured against a custom LLVM, we may have a |
| // differing data layout, even though we should update our own to use |
| // that one. |
| // |
| // As an interim hack, if CFG_LLVM_ROOT is not an empty string then we |
| // disable this check entirely as we may be configured with something |
| // that has a different target layout. |
| // |
| // Unsure if this will actually cause breakage when rustc is configured |
| // as such. |
| // |
| // FIXME(#34960) |
| let cfg_llvm_root = option_env!("CFG_LLVM_ROOT").unwrap_or(""); |
| let custom_llvm_used = cfg_llvm_root.trim() != ""; |
| |
| if !custom_llvm_used && sess.target.target.data_layout != data_layout { |
| bug!("data-layout for builtin `{}` target, `{}`, \ |
| differs from LLVM default, `{}`", |
| sess.target.target.llvm_target, |
| sess.target.target.data_layout, |
| data_layout); |
| } |
| } |
| |
| let data_layout = CString::new(&sess.target.target.data_layout[..]).unwrap(); |
| llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr()); |
| |
| let llvm_target = sess.target.target.llvm_target.as_bytes(); |
| let llvm_target = CString::new(llvm_target).unwrap(); |
| llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr()); |
| |
| if is_pie_binary(sess) { |
| llvm::LLVMRustSetModulePIELevel(llmod); |
| } |
| |
| (llcx, llmod) |
| } |
| |
| impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> { |
| pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>) -> SharedCrateContext<'b, 'tcx> { |
| // An interesting part of Windows which MSVC forces our hand on (and |
| // apparently MinGW didn't) is the usage of `dllimport` and `dllexport` |
| // attributes in LLVM IR as well as native dependencies (in C these |
| // correspond to `__declspec(dllimport)`). |
| // |
| // Whenever a dynamic library is built by MSVC it must have its public |
| // interface specified by functions tagged with `dllexport` or otherwise |
| // they're not available to be linked against. This poses a few problems |
| // for the compiler, some of which are somewhat fundamental, but we use |
| // the `use_dll_storage_attrs` variable below to attach the `dllexport` |
| // attribute to all LLVM functions that are exported e.g. they're |
| // already tagged with external linkage). This is suboptimal for a few |
| // reasons: |
| // |
| // * If an object file will never be included in a dynamic library, |
| // there's no need to attach the dllexport attribute. Most object |
| // files in Rust are not destined to become part of a dll as binaries |
| // are statically linked by default. |
| // * If the compiler is emitting both an rlib and a dylib, the same |
| // source object file is currently used but with MSVC this may be less |
| // feasible. The compiler may be able to get around this, but it may |
| // involve some invasive changes to deal with this. |
| // |
| // The flipside of this situation is that whenever you link to a dll and |
| // you import a function from it, the import should be tagged with |
| // `dllimport`. At this time, however, the compiler does not emit |
| // `dllimport` for any declarations other than constants (where it is |
| // required), which is again suboptimal for even more reasons! |
| // |
| // * Calling a function imported from another dll without using |
| // `dllimport` causes the linker/compiler to have extra overhead (one |
| // `jmp` instruction on x86) when calling the function. |
| // * The same object file may be used in different circumstances, so a |
| // function may be imported from a dll if the object is linked into a |
| // dll, but it may be just linked against if linked into an rlib. |
| // * The compiler has no knowledge about whether native functions should |
| // be tagged dllimport or not. |
| // |
| // For now the compiler takes the perf hit (I do not have any numbers to |
| // this effect) by marking very little as `dllimport` and praying the |
| // linker will take care of everything. Fixing this problem will likely |
| // require adding a few attributes to Rust itself (feature gated at the |
| // start) and then strongly recommending static linkage on MSVC! |
| let use_dll_storage_attrs = tcx.sess.target.target.options.is_like_msvc; |
| |
| let check_overflow = tcx.sess.overflow_checks(); |
| |
| let tls_model = get_tls_model(&tcx.sess); |
| |
| SharedCrateContext { |
| tcx, |
| check_overflow, |
| use_dll_storage_attrs, |
| tls_model, |
| } |
| } |
| |
| pub fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool { |
| common::type_needs_drop(self.tcx, ty) |
| } |
| |
| pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool { |
| common::type_is_sized(self.tcx, ty) |
| } |
| |
| pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool { |
| common::type_is_freeze(self.tcx, ty) |
| } |
| |
| pub fn type_has_metadata(&self, ty: Ty<'tcx>) -> bool { |
| use syntax_pos::DUMMY_SP; |
| if ty.is_sized(self.tcx, ty::ParamEnv::empty(traits::Reveal::All), DUMMY_SP) { |
| return false; |
| } |
| |
| let tail = self.tcx.struct_tail(ty); |
| match tail.sty { |
| ty::TyForeign(..) => false, |
| ty::TyStr | ty::TySlice(..) | ty::TyDynamic(..) => true, |
| _ => bug!("unexpected unsized tail: {:?}", tail.sty), |
| } |
| } |
| |
| pub fn tcx(&self) -> TyCtxt<'b, 'tcx, 'tcx> { |
| self.tcx |
| } |
| |
| pub fn sess<'a>(&'a self) -> &'a Session { |
| &self.tcx.sess |
| } |
| |
| pub fn dep_graph<'a>(&'a self) -> &'a DepGraph { |
| &self.tcx.dep_graph |
| } |
| |
| pub fn use_dll_storage_attrs(&self) -> bool { |
| self.use_dll_storage_attrs |
| } |
| } |
| |
| impl<'a, 'tcx> LocalCrateContext<'a, 'tcx> { |
| pub fn new(shared: &SharedCrateContext<'a, 'tcx>, |
| codegen_unit: Arc<CodegenUnit<'tcx>>, |
| llmod_id: &str) |
| -> LocalCrateContext<'a, 'tcx> { |
| unsafe { |
| let (llcx, llmod) = create_context_and_module(&shared.tcx.sess, |
| &llmod_id[..]); |
| |
| let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo { |
| let dctx = debuginfo::CrateDebugContext::new(llmod); |
| debuginfo::metadata::compile_unit_metadata(shared, |
| codegen_unit.name(), |
| &dctx, |
| shared.tcx.sess); |
| Some(dctx) |
| } else { |
| None |
| }; |
| |
| let local_ccx = LocalCrateContext { |
| llmod, |
| llcx, |
| stats: RefCell::new(Stats::default()), |
| codegen_unit, |
| instances: RefCell::new(FxHashMap()), |
| vtables: RefCell::new(FxHashMap()), |
| const_cstr_cache: RefCell::new(FxHashMap()), |
| const_unsized: RefCell::new(FxHashMap()), |
| const_globals: RefCell::new(FxHashMap()), |
| statics: RefCell::new(FxHashMap()), |
| statics_to_rauw: RefCell::new(Vec::new()), |
| used_statics: RefCell::new(Vec::new()), |
| lltypes: RefCell::new(FxHashMap()), |
| scalar_lltypes: RefCell::new(FxHashMap()), |
| pointee_infos: RefCell::new(FxHashMap()), |
| isize_ty: Type::from_ref(ptr::null_mut()), |
| dbg_cx, |
| eh_personality: Cell::new(None), |
| eh_unwind_resume: Cell::new(None), |
| rust_try_fn: Cell::new(None), |
| intrinsics: RefCell::new(FxHashMap()), |
| local_gen_sym_counter: Cell::new(0), |
| placeholder: PhantomData, |
| }; |
| |
| let (isize_ty, mut local_ccx) = { |
| // Do a little dance to create a dummy CrateContext, so we can |
| // create some things in the LLVM module of this codegen unit |
| let mut local_ccxs = vec![local_ccx]; |
| let isize_ty = { |
| let dummy_ccx = LocalCrateContext::dummy_ccx(shared, |
| local_ccxs.as_mut_slice()); |
| Type::isize(&dummy_ccx) |
| }; |
| (isize_ty, local_ccxs.pop().unwrap()) |
| }; |
| |
| local_ccx.isize_ty = isize_ty; |
| |
| local_ccx |
| } |
| } |
| |
| /// Create a dummy `CrateContext` from `self` and the provided |
| /// `SharedCrateContext`. This is somewhat dangerous because `self` may |
| /// not be fully initialized. |
| /// |
| /// This is used in the `LocalCrateContext` constructor to allow calling |
| /// functions that expect a complete `CrateContext`, even before the local |
| /// portion is fully initialized and attached to the `SharedCrateContext`. |
| fn dummy_ccx(shared: &'a SharedCrateContext<'a, 'tcx>, |
| local_ccxs: &'a [LocalCrateContext<'a, 'tcx>]) |
| -> CrateContext<'a, 'tcx> { |
| assert!(local_ccxs.len() == 1); |
| CrateContext { |
| shared, |
| local_ccx: &local_ccxs[0] |
| } |
| } |
| |
| pub fn into_stats(self) -> Stats { |
| self.stats.into_inner() |
| } |
| } |
| |
| impl<'b, 'tcx> CrateContext<'b, 'tcx> { |
| pub fn shared(&self) -> &'b SharedCrateContext<'b, 'tcx> { |
| self.shared |
| } |
| |
| fn local(&self) -> &'b LocalCrateContext<'b, 'tcx> { |
| self.local_ccx |
| } |
| |
| pub fn tcx(&self) -> TyCtxt<'b, 'tcx, 'tcx> { |
| self.shared.tcx |
| } |
| |
| pub fn sess<'a>(&'a self) -> &'a Session { |
| &self.shared.tcx.sess |
| } |
| |
| pub fn get_intrinsic(&self, key: &str) -> ValueRef { |
| if let Some(v) = self.intrinsics().borrow().get(key).cloned() { |
| return v; |
| } |
| match declare_intrinsic(self, key) { |
| Some(v) => return v, |
| None => bug!("unknown intrinsic '{}'", key) |
| } |
| } |
| |
| pub fn llmod(&self) -> ModuleRef { |
| self.local().llmod |
| } |
| |
| pub fn llcx(&self) -> ContextRef { |
| self.local().llcx |
| } |
| |
| pub fn codegen_unit(&self) -> &CodegenUnit<'tcx> { |
| &self.local().codegen_unit |
| } |
| |
| pub fn td(&self) -> llvm::TargetDataRef { |
| unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) } |
| } |
| |
| pub fn instances<'a>(&'a self) -> &'a RefCell<FxHashMap<Instance<'tcx>, ValueRef>> { |
| &self.local().instances |
| } |
| |
| pub fn vtables<'a>(&'a self) |
| -> &'a RefCell<FxHashMap<(Ty<'tcx>, |
| Option<ty::PolyExistentialTraitRef<'tcx>>), ValueRef>> { |
| &self.local().vtables |
| } |
| |
| pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FxHashMap<InternedString, ValueRef>> { |
| &self.local().const_cstr_cache |
| } |
| |
| pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> { |
| &self.local().const_unsized |
| } |
| |
| pub fn const_globals<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, ValueRef>> { |
| &self.local().const_globals |
| } |
| |
| pub fn statics<'a>(&'a self) -> &'a RefCell<FxHashMap<ValueRef, DefId>> { |
| &self.local().statics |
| } |
| |
| pub fn statics_to_rauw<'a>(&'a self) -> &'a RefCell<Vec<(ValueRef, ValueRef)>> { |
| &self.local().statics_to_rauw |
| } |
| |
| pub fn used_statics<'a>(&'a self) -> &'a RefCell<Vec<ValueRef>> { |
| &self.local().used_statics |
| } |
| |
| pub fn lltypes<'a>(&'a self) -> &'a RefCell<FxHashMap<(Ty<'tcx>, Option<usize>), Type>> { |
| &self.local().lltypes |
| } |
| |
| pub fn scalar_lltypes<'a>(&'a self) -> &'a RefCell<FxHashMap<Ty<'tcx>, Type>> { |
| &self.local().scalar_lltypes |
| } |
| |
| pub fn pointee_infos<'a>(&'a self) |
| -> &'a RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>> { |
| &self.local().pointee_infos |
| } |
| |
| pub fn stats<'a>(&'a self) -> &'a RefCell<Stats> { |
| &self.local().stats |
| } |
| |
| pub fn isize_ty(&self) -> Type { |
| self.local().isize_ty |
| } |
| |
| pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> { |
| &self.local().dbg_cx |
| } |
| |
| pub fn rust_try_fn<'a>(&'a self) -> &'a Cell<Option<ValueRef>> { |
| &self.local().rust_try_fn |
| } |
| |
| fn intrinsics<'a>(&'a self) -> &'a RefCell<FxHashMap<&'static str, ValueRef>> { |
| &self.local().intrinsics |
| } |
| |
| pub fn check_overflow(&self) -> bool { |
| self.shared.check_overflow |
| } |
| |
| pub fn use_dll_storage_attrs(&self) -> bool { |
| self.shared.use_dll_storage_attrs() |
| } |
| |
| pub fn tls_model(&self) -> llvm::ThreadLocalMode { |
| self.shared.tls_model |
| } |
| |
| /// Generate a new symbol name with the given prefix. This symbol name must |
| /// only be used for definitions with `internal` or `private` linkage. |
| pub fn generate_local_symbol_name(&self, prefix: &str) -> String { |
| let idx = self.local().local_gen_sym_counter.get(); |
| self.local().local_gen_sym_counter.set(idx + 1); |
| // Include a '.' character, so there can be no accidental conflicts with |
| // user defined names |
| let mut name = String::with_capacity(prefix.len() + 6); |
| name.push_str(prefix); |
| name.push_str("."); |
| base_n::push_str(idx as u128, base_n::ALPHANUMERIC_ONLY, &mut name); |
| name |
| } |
| |
| pub fn eh_personality(&self) -> ValueRef { |
| // The exception handling personality function. |
| // |
| // If our compilation unit has the `eh_personality` lang item somewhere |
| // within it, then we just need to translate that. Otherwise, we're |
| // building an rlib which will depend on some upstream implementation of |
| // this function, so we just codegen a generic reference to it. We don't |
| // specify any of the types for the function, we just make it a symbol |
| // that LLVM can later use. |
| // |
| // Note that MSVC is a little special here in that we don't use the |
| // `eh_personality` lang item at all. Currently LLVM has support for |
| // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the |
| // *name of the personality function* to decide what kind of unwind side |
| // tables/landing pads to emit. It looks like Dwarf is used by default, |
| // injecting a dependency on the `_Unwind_Resume` symbol for resuming |
| // an "exception", but for MSVC we want to force SEH. This means that we |
| // can't actually have the personality function be our standard |
| // `rust_eh_personality` function, but rather we wired it up to the |
| // CRT's custom personality function, which forces LLVM to consider |
| // landing pads as "landing pads for SEH". |
| if let Some(llpersonality) = self.local().eh_personality.get() { |
| return llpersonality |
| } |
| let tcx = self.tcx(); |
| let llfn = match tcx.lang_items().eh_personality() { |
| Some(def_id) if !base::wants_msvc_seh(self.sess()) => { |
| callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[])) |
| } |
| _ => { |
| let name = if base::wants_msvc_seh(self.sess()) { |
| "__CxxFrameHandler3" |
| } else { |
| "rust_eh_personality" |
| }; |
| let fty = Type::variadic_func(&[], &Type::i32(self)); |
| declare::declare_cfn(self, name, fty) |
| } |
| }; |
| self.local().eh_personality.set(Some(llfn)); |
| llfn |
| } |
| |
| // Returns a ValueRef of the "eh_unwind_resume" lang item if one is defined, |
| // otherwise declares it as an external function. |
| pub fn eh_unwind_resume(&self) -> ValueRef { |
| use attributes; |
| let unwresume = &self.local().eh_unwind_resume; |
| if let Some(llfn) = unwresume.get() { |
| return llfn; |
| } |
| |
| let tcx = self.tcx(); |
| assert!(self.sess().target.target.options.custom_unwind_resume); |
| if let Some(def_id) = tcx.lang_items().eh_unwind_resume() { |
| let llfn = callee::resolve_and_get_fn(self, def_id, tcx.intern_substs(&[])); |
| unwresume.set(Some(llfn)); |
| return llfn; |
| } |
| |
| let ty = tcx.mk_fn_ptr(ty::Binder(tcx.mk_fn_sig( |
| iter::once(tcx.mk_mut_ptr(tcx.types.u8)), |
| tcx.types.never, |
| false, |
| hir::Unsafety::Unsafe, |
| Abi::C |
| ))); |
| |
| let llfn = declare::declare_fn(self, "rust_eh_unwind_resume", ty); |
| attributes::unwind(llfn, true); |
| unwresume.set(Some(llfn)); |
| llfn |
| } |
| } |
| |
| impl<'a, 'tcx> ty::layout::HasDataLayout for &'a SharedCrateContext<'a, 'tcx> { |
| fn data_layout(&self) -> &ty::layout::TargetDataLayout { |
| &self.tcx.data_layout |
| } |
| } |
| |
| impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a SharedCrateContext<'a, 'tcx> { |
| fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> { |
| self.tcx |
| } |
| } |
| |
| impl<'a, 'tcx> ty::layout::HasDataLayout for &'a CrateContext<'a, 'tcx> { |
| fn data_layout(&self) -> &ty::layout::TargetDataLayout { |
| &self.shared.tcx.data_layout |
| } |
| } |
| |
| impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a CrateContext<'a, 'tcx> { |
| fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> { |
| self.shared.tcx |
| } |
| } |
| |
| impl<'a, 'tcx> LayoutOf<Ty<'tcx>> for &'a SharedCrateContext<'a, 'tcx> { |
| type TyLayout = TyLayout<'tcx>; |
| |
| fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout { |
| (self.tcx, ty::ParamEnv::empty(traits::Reveal::All)) |
| .layout_of(ty) |
| .unwrap_or_else(|e| match e { |
| LayoutError::SizeOverflow(_) => self.sess().fatal(&e.to_string()), |
| _ => bug!("failed to get layout for `{}`: {}", ty, e) |
| }) |
| } |
| } |
| |
| impl<'a, 'tcx> LayoutOf<Ty<'tcx>> for &'a CrateContext<'a, 'tcx> { |
| type TyLayout = TyLayout<'tcx>; |
| |
| |
| fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout { |
| self.shared.layout_of(ty) |
| } |
| } |
| |
| /// Declare any llvm intrinsics that you might need |
| fn declare_intrinsic(ccx: &CrateContext, key: &str) -> Option<ValueRef> { |
| macro_rules! ifn { |
| ($name:expr, fn() -> $ret:expr) => ( |
| if key == $name { |
| let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret)); |
| llvm::SetUnnamedAddr(f, false); |
| ccx.intrinsics().borrow_mut().insert($name, f.clone()); |
| return Some(f); |
| } |
| ); |
| ($name:expr, fn(...) -> $ret:expr) => ( |
| if key == $name { |
| let f = declare::declare_cfn(ccx, $name, Type::variadic_func(&[], &$ret)); |
| llvm::SetUnnamedAddr(f, false); |
| ccx.intrinsics().borrow_mut().insert($name, f.clone()); |
| return Some(f); |
| } |
| ); |
| ($name:expr, fn($($arg:expr),*) -> $ret:expr) => ( |
| if key == $name { |
| let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret)); |
| llvm::SetUnnamedAddr(f, false); |
| ccx.intrinsics().borrow_mut().insert($name, f.clone()); |
| return Some(f); |
| } |
| ); |
| } |
| macro_rules! mk_struct { |
| ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false)) |
| } |
| |
| let i8p = Type::i8p(ccx); |
| let void = Type::void(ccx); |
| let i1 = Type::i1(ccx); |
| let t_i8 = Type::i8(ccx); |
| let t_i16 = Type::i16(ccx); |
| let t_i32 = Type::i32(ccx); |
| let t_i64 = Type::i64(ccx); |
| let t_i128 = Type::i128(ccx); |
| let t_f32 = Type::f32(ccx); |
| let t_f64 = Type::f64(ccx); |
| |
| ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void); |
| ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void); |
| ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void); |
| ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void); |
| ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void); |
| ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void); |
| ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void); |
| ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void); |
| ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void); |
| |
| ifn!("llvm.trap", fn() -> void); |
| ifn!("llvm.debugtrap", fn() -> void); |
| ifn!("llvm.frameaddress", fn(t_i32) -> i8p); |
| |
| ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32); |
| ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64); |
| ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32); |
| ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64); |
| |
| ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.sin.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.sin.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.cos.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.cos.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.exp.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.exp.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.log.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.log.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.log10.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.log10.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.log2.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.log2.f64", fn(t_f64) -> t_f64); |
| |
| ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32); |
| ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64); |
| |
| ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64); |
| |
| ifn!("llvm.floor.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.floor.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64); |
| |
| ifn!("llvm.copysign.f32", fn(t_f32, t_f32) -> t_f32); |
| ifn!("llvm.copysign.f64", fn(t_f64, t_f64) -> t_f64); |
| ifn!("llvm.round.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.round.f64", fn(t_f64) -> t_f64); |
| |
| ifn!("llvm.rint.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.rint.f64", fn(t_f64) -> t_f64); |
| ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32); |
| ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64); |
| |
| ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8); |
| ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16); |
| ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32); |
| ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64); |
| ifn!("llvm.ctpop.i128", fn(t_i128) -> t_i128); |
| |
| ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8); |
| ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16); |
| ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32); |
| ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64); |
| ifn!("llvm.ctlz.i128", fn(t_i128, i1) -> t_i128); |
| |
| ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8); |
| ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16); |
| ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32); |
| ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64); |
| ifn!("llvm.cttz.i128", fn(t_i128, i1) -> t_i128); |
| |
| ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16); |
| ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32); |
| ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64); |
| ifn!("llvm.bswap.i128", fn(t_i128) -> t_i128); |
| |
| ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1}); |
| ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1}); |
| ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1}); |
| ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1}); |
| ifn!("llvm.sadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1}); |
| |
| ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1}); |
| ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1}); |
| ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1}); |
| ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1}); |
| ifn!("llvm.uadd.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1}); |
| |
| ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1}); |
| ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1}); |
| ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1}); |
| ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1}); |
| ifn!("llvm.ssub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1}); |
| |
| ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1}); |
| ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1}); |
| ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1}); |
| ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1}); |
| ifn!("llvm.usub.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1}); |
| |
| ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1}); |
| ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1}); |
| ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1}); |
| ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1}); |
| ifn!("llvm.smul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1}); |
| |
| ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1}); |
| ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1}); |
| ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1}); |
| ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1}); |
| ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1}); |
| |
| ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void); |
| ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void); |
| |
| ifn!("llvm.expect.i1", fn(i1, i1) -> i1); |
| ifn!("llvm.eh.typeid.for", fn(i8p) -> t_i32); |
| ifn!("llvm.localescape", fn(...) -> void); |
| ifn!("llvm.localrecover", fn(i8p, i8p, t_i32) -> i8p); |
| ifn!("llvm.x86.seh.recoverfp", fn(i8p, i8p) -> i8p); |
| |
| ifn!("llvm.assume", fn(i1) -> void); |
| ifn!("llvm.prefetch", fn(i8p, t_i32, t_i32, t_i32) -> void); |
| |
| if ccx.sess().opts.debuginfo != NoDebugInfo { |
| ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void); |
| ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void); |
| } |
| return None; |
| } |
