src/librustc_trans/trans/context.rs

   1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use llvm;
  12 use llvm::{ContextRef, ModuleRef, ValueRef, BuilderRef};
  13 use llvm::TargetData;
  14 use llvm::mk_target_data;
  15 use metadata::common::LinkMeta;
  16 use middle::def::ExportMap;
  17 use middle::traits;
  18 use trans::adt;
  19 use trans::base;
  20 use trans::builder::Builder;
  21 use trans::common::{ExternMap,BuilderRef_res};
  22 use trans::debuginfo;
  23 use trans::declare;
  24 use trans::glue::DropGlueKind;
  25 use trans::monomorphize::MonoId;
  26 use trans::type_::{Type, TypeNames};
  27 use middle::subst::Substs;
  28 use middle::ty::{self, Ty};
  29 use session::config::NoDebugInfo;
  30 use session::Session;
  31 use util::ppaux::Repr;
  32 use util::sha2::Sha256;
  33 use util::nodemap::{NodeMap, NodeSet, DefIdMap, FnvHashMap, FnvHashSet};
  34
  35 use std::ffi::CString;
  36 use std::cell::{Cell, RefCell};
  37 use std::ptr;
  38 use std::rc::Rc;
  39 use syntax::ast;
  40 use syntax::parse::token::InternedString;
  41
  42 pub struct Stats {
  43     pub n_glues_created: Cell<usize>,
  44     pub n_null_glues: Cell<usize>,
  45     pub n_real_glues: Cell<usize>,
  46     pub n_fns: Cell<usize>,
  47     pub n_monos: Cell<usize>,
  48     pub n_inlines: Cell<usize>,
  49     pub n_closures: Cell<usize>,
  50     pub n_llvm_insns: Cell<usize>,
  51     pub llvm_insns: RefCell<FnvHashMap<String, usize>>,
  52     // (ident, llvm-instructions)
  53     pub fn_stats: RefCell<Vec<(String, usize)> >,
  54 }
  55
  56 /// The shared portion of a `CrateContext`.  There is one `SharedCrateContext`
  57 /// per crate.  The data here is shared between all compilation units of the
  58 /// crate, so it must not contain references to any LLVM data structures
  59 /// (aside from metadata-related ones).
  60 pub struct SharedCrateContext<'tcx> {
  61     local_ccxs: Vec<LocalCrateContext<'tcx>>,
  62
  63     metadata_llmod: ModuleRef,
  64     metadata_llcx: ContextRef,
  65
  66     export_map: ExportMap,
  67     reachable: NodeSet,
  68     item_symbols: RefCell<NodeMap<String>>,
  69     link_meta: LinkMeta,
  70     symbol_hasher: RefCell<Sha256>,
  71     tcx: ty::ctxt<'tcx>,
  72     stats: Stats,
  73     check_overflow: bool,
  74     check_drop_flag_for_sanity: bool,
  75
  76     available_monomorphizations: RefCell<FnvHashSet<String>>,
  77     available_drop_glues: RefCell<FnvHashMap<DropGlueKind<'tcx>, String>>,
  78 }
  79
  80 /// The local portion of a `CrateContext`.  There is one `LocalCrateContext`
  81 /// per compilation unit.  Each one has its own LLVM `ContextRef` so that
  82 /// several compilation units may be optimized in parallel.  All other LLVM
  83 /// data structures in the `LocalCrateContext` are tied to that `ContextRef`.
  84 pub struct LocalCrateContext<'tcx> {
  85     llmod: ModuleRef,
  86     llcx: ContextRef,
  87     td: TargetData,
  88     tn: TypeNames,
  89     externs: RefCell<ExternMap>,
  90     item_vals: RefCell<NodeMap<ValueRef>>,
  91     needs_unwind_cleanup_cache: RefCell<FnvHashMap<Ty<'tcx>, bool>>,
  92     fn_pointer_shims: RefCell<FnvHashMap<Ty<'tcx>, ValueRef>>,
  93     drop_glues: RefCell<FnvHashMap<DropGlueKind<'tcx>, ValueRef>>,
  94     /// Track mapping of external ids to local items imported for inlining
  95     external: RefCell<DefIdMap<Option<ast::NodeId>>>,
  96     /// Backwards version of the `external` map (inlined items to where they
  97     /// came from)
  98     external_srcs: RefCell<NodeMap<ast::DefId>>,
  99     /// Cache instances of monomorphized functions
 100     monomorphized: RefCell<FnvHashMap<MonoId<'tcx>, ValueRef>>,
 101     monomorphizing: RefCell<DefIdMap<usize>>,
 102     /// Cache generated vtables
 103     vtables: RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>>,
 104     /// Cache of constant strings,
 105     const_cstr_cache: RefCell<FnvHashMap<InternedString, ValueRef>>,
 106
 107     /// Reverse-direction for const ptrs cast from globals.
 108     /// Key is a ValueRef holding a *T,
 109     /// Val is a ValueRef holding a *[T].
 110     ///
 111     /// Needed because LLVM loses pointer->pointee association
 112     /// when we ptrcast, and we have to ptrcast during translation
 113     /// of a [T] const because we form a slice, a (*T,usize) pair, not
 114     /// a pointer to an LLVM array type. Similar for trait objects.
 115     const_unsized: RefCell<FnvHashMap<ValueRef, ValueRef>>,
 116
 117     /// Cache of emitted const globals (value -> global)
 118     const_globals: RefCell<FnvHashMap<ValueRef, ValueRef>>,
 119
 120     /// Cache of emitted const values
 121     const_values: RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>), ValueRef>>,
 122
 123     /// Cache of emitted static values
 124     static_values: RefCell<NodeMap<ValueRef>>,
 125
 126     /// Cache of external const values
 127     extern_const_values: RefCell<DefIdMap<ValueRef>>,
 128
 129     impl_method_cache: RefCell<FnvHashMap<(ast::DefId, ast::Name), ast::DefId>>,
 130
 131     /// Cache of closure wrappers for bare fn's.
 132     closure_bare_wrapper_cache: RefCell<FnvHashMap<ValueRef, ValueRef>>,
 133
 134     lltypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
 135     llsizingtypes: RefCell<FnvHashMap<Ty<'tcx>, Type>>,
 136     adt_reprs: RefCell<FnvHashMap<Ty<'tcx>, Rc<adt::Repr<'tcx>>>>,
 137     type_hashcodes: RefCell<FnvHashMap<Ty<'tcx>, String>>,
 138     int_type: Type,
 139     opaque_vec_type: Type,
 140     builder: BuilderRef_res,
 141
 142     /// Holds the LLVM values for closure IDs.
 143     closure_vals: RefCell<FnvHashMap<MonoId<'tcx>, ValueRef>>,
 144
 145     dbg_cx: Option<debuginfo::CrateDebugContext<'tcx>>,
 146
 147     eh_personality: RefCell<Option<ValueRef>>,
 148
 149     intrinsics: RefCell<FnvHashMap<&'static str, ValueRef>>,
 150
 151     /// Number of LLVM instructions translated into this `LocalCrateContext`.
 152     /// This is used to perform some basic load-balancing to keep all LLVM
 153     /// contexts around the same size.
 154     n_llvm_insns: Cell<usize>,
 155
 156     trait_cache: RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>,
 157                                     traits::Vtable<'tcx, ()>>>,
 158 }
 159
 160 pub struct CrateContext<'a, 'tcx: 'a> {
 161     shared: &'a SharedCrateContext<'tcx>,
 162     local: &'a LocalCrateContext<'tcx>,
 163     /// The index of `local` in `shared.local_ccxs`.  This is used in
 164     /// `maybe_iter(true)` to identify the original `LocalCrateContext`.
 165     index: usize,
 166 }
 167
 168 pub struct CrateContextIterator<'a, 'tcx: 'a> {
 169     shared: &'a SharedCrateContext<'tcx>,
 170     index: usize,
 171 }
 172
 173 impl<'a, 'tcx> Iterator for CrateContextIterator<'a,'tcx> {
 174     type Item = CrateContext<'a, 'tcx>;
 175
 176     fn next(&mut self) -> Option<CrateContext<'a, 'tcx>> {
 177         if self.index >= self.shared.local_ccxs.len() {
 178             return None;
 179         }
 180
 181         let index = self.index;
 182         self.index += 1;
 183
 184         Some(CrateContext {
 185             shared: self.shared,
 186             local: &self.shared.local_ccxs[index],
 187             index: index,
 188         })
 189     }
 190 }
 191
 192 /// The iterator produced by `CrateContext::maybe_iter`.
 193 pub struct CrateContextMaybeIterator<'a, 'tcx: 'a> {
 194     shared: &'a SharedCrateContext<'tcx>,
 195     index: usize,
 196     single: bool,
 197     origin: usize,
 198 }
 199
 200 impl<'a, 'tcx> Iterator for CrateContextMaybeIterator<'a, 'tcx> {
 201     type Item = (CrateContext<'a, 'tcx>, bool);
 202
 203     fn next(&mut self) -> Option<(CrateContext<'a, 'tcx>, bool)> {
 204         if self.index >= self.shared.local_ccxs.len() {
 205             return None;
 206         }
 207
 208         let index = self.index;
 209         self.index += 1;
 210         if self.single {
 211             self.index = self.shared.local_ccxs.len();
 212         }
 213
 214         let ccx = CrateContext {
 215             shared: self.shared,
 216             local: &self.shared.local_ccxs[index],
 217             index: index,
 218         };
 219         Some((ccx, index == self.origin))
 220     }
 221 }
 222
 223
 224 unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextRef, ModuleRef) {
 225     let llcx = llvm::LLVMContextCreate();
 226     let mod_name = CString::new(mod_name).unwrap();
 227     let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
 228
 229     let data_layout = sess.target.target.data_layout.as_bytes();
 230     let data_layout = CString::new(data_layout).unwrap();
 231     llvm::LLVMSetDataLayout(llmod, data_layout.as_ptr());
 232
 233     let llvm_target = sess.target.target.llvm_target.as_bytes();
 234     let llvm_target = CString::new(llvm_target).unwrap();
 235     llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
 236     (llcx, llmod)
 237 }
 238
 239 impl<'tcx> SharedCrateContext<'tcx> {
 240     pub fn new(crate_name: &str,
 241                local_count: usize,
 242                tcx: ty::ctxt<'tcx>,
 243                export_map: ExportMap,
 244                symbol_hasher: Sha256,
 245                link_meta: LinkMeta,
 246                reachable: NodeSet,
 247                check_overflow: bool,
 248                check_drop_flag_for_sanity: bool)
 249                -> SharedCrateContext<'tcx> {
 250         let (metadata_llcx, metadata_llmod) = unsafe {
 251             create_context_and_module(&tcx.sess, "metadata")
 252         };
 253
 254         let mut shared_ccx = SharedCrateContext {
 255             local_ccxs: Vec::with_capacity(local_count),
 256             metadata_llmod: metadata_llmod,
 257             metadata_llcx: metadata_llcx,
 258             export_map: export_map,
 259             reachable: reachable,
 260             item_symbols: RefCell::new(NodeMap()),
 261             link_meta: link_meta,
 262             symbol_hasher: RefCell::new(symbol_hasher),
 263             tcx: tcx,
 264             stats: Stats {
 265                 n_glues_created: Cell::new(0),
 266                 n_null_glues: Cell::new(0),
 267                 n_real_glues: Cell::new(0),
 268                 n_fns: Cell::new(0),
 269                 n_monos: Cell::new(0),
 270                 n_inlines: Cell::new(0),
 271                 n_closures: Cell::new(0),
 272                 n_llvm_insns: Cell::new(0),
 273                 llvm_insns: RefCell::new(FnvHashMap()),
 274                 fn_stats: RefCell::new(Vec::new()),
 275             },
 276             check_overflow: check_overflow,
 277             check_drop_flag_for_sanity: check_drop_flag_for_sanity,
 278             available_monomorphizations: RefCell::new(FnvHashSet()),
 279             available_drop_glues: RefCell::new(FnvHashMap()),
 280         };
 281
 282         for i in 0..local_count {
 283             // Append ".rs" to crate name as LLVM module identifier.
 284             //
 285             // LLVM code generator emits a ".file filename" directive
 286             // for ELF backends. Value of the "filename" is set as the
 287             // LLVM module identifier.  Due to a LLVM MC bug[1], LLVM
 288             // crashes if the module identifier is same as other symbols
 289             // such as a function name in the module.
 290             // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
 291             let llmod_id = format!("{}.{}.rs", crate_name, i);
 292             let local_ccx = LocalCrateContext::new(&shared_ccx, &llmod_id[..]);
 293             shared_ccx.local_ccxs.push(local_ccx);
 294         }
 295
 296         shared_ccx
 297     }
 298
 299     pub fn iter<'a>(&'a self) -> CrateContextIterator<'a, 'tcx> {
 300         CrateContextIterator {
 301             shared: self,
 302             index: 0,
 303         }
 304     }
 305
 306     pub fn get_ccx<'a>(&'a self, index: usize) -> CrateContext<'a, 'tcx> {
 307         CrateContext {
 308             shared: self,
 309             local: &self.local_ccxs[index],
 310             index: index,
 311         }
 312     }
 313
 314     fn get_smallest_ccx<'a>(&'a self) -> CrateContext<'a, 'tcx> {
 315         let (local_ccx, index) =
 316             self.local_ccxs
 317                 .iter()
 318                 .zip(0..self.local_ccxs.len())
 319                 .min_by(|&(local_ccx, _idx)| local_ccx.n_llvm_insns.get())
 320                 .unwrap();
 321         CrateContext {
 322             shared: self,
 323             local: local_ccx,
 324             index: index,
 325         }
 326     }
 327
 328
 329     pub fn metadata_llmod(&self) -> ModuleRef {
 330         self.metadata_llmod
 331     }
 332
 333     pub fn metadata_llcx(&self) -> ContextRef {
 334         self.metadata_llcx
 335     }
 336
 337     pub fn export_map<'a>(&'a self) -> &'a ExportMap {
 338         &self.export_map
 339     }
 340
 341     pub fn reachable<'a>(&'a self) -> &'a NodeSet {
 342         &self.reachable
 343     }
 344
 345     pub fn item_symbols<'a>(&'a self) -> &'a RefCell<NodeMap<String>> {
 346         &self.item_symbols
 347     }
 348
 349     pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
 350         &self.link_meta
 351     }
 352
 353     pub fn tcx<'a>(&'a self) -> &'a ty::ctxt<'tcx> {
 354         &self.tcx
 355     }
 356
 357     pub fn take_tcx(self) -> ty::ctxt<'tcx> {
 358         self.tcx
 359     }
 360
 361     pub fn sess<'a>(&'a self) -> &'a Session {
 362         &self.tcx.sess
 363     }
 364
 365     pub fn stats<'a>(&'a self) -> &'a Stats {
 366         &self.stats
 367     }
 368 }
 369
 370 impl<'tcx> LocalCrateContext<'tcx> {
 371     fn new(shared: &SharedCrateContext<'tcx>,
 372            name: &str)
 373            -> LocalCrateContext<'tcx> {
 374         unsafe {
 375             let (llcx, llmod) = create_context_and_module(&shared.tcx.sess, name);
 376
 377             let td = mk_target_data(&shared.tcx
 378                                           .sess
 379                                           .target
 380                                           .target
 381                                           .data_layout
 382                                           );
 383
 384             let dbg_cx = if shared.tcx.sess.opts.debuginfo != NoDebugInfo {
 385                 Some(debuginfo::CrateDebugContext::new(llmod))
 386             } else {
 387                 None
 388             };
 389
 390             let mut local_ccx = LocalCrateContext {
 391                 llmod: llmod,
 392                 llcx: llcx,
 393                 td: td,
 394                 tn: TypeNames::new(),
 395                 externs: RefCell::new(FnvHashMap()),
 396                 item_vals: RefCell::new(NodeMap()),
 397                 needs_unwind_cleanup_cache: RefCell::new(FnvHashMap()),
 398                 fn_pointer_shims: RefCell::new(FnvHashMap()),
 399                 drop_glues: RefCell::new(FnvHashMap()),
 400                 external: RefCell::new(DefIdMap()),
 401                 external_srcs: RefCell::new(NodeMap()),
 402                 monomorphized: RefCell::new(FnvHashMap()),
 403                 monomorphizing: RefCell::new(DefIdMap()),
 404                 vtables: RefCell::new(FnvHashMap()),
 405                 const_cstr_cache: RefCell::new(FnvHashMap()),
 406                 const_unsized: RefCell::new(FnvHashMap()),
 407                 const_globals: RefCell::new(FnvHashMap()),
 408                 const_values: RefCell::new(FnvHashMap()),
 409                 static_values: RefCell::new(NodeMap()),
 410                 extern_const_values: RefCell::new(DefIdMap()),
 411                 impl_method_cache: RefCell::new(FnvHashMap()),
 412                 closure_bare_wrapper_cache: RefCell::new(FnvHashMap()),
 413                 lltypes: RefCell::new(FnvHashMap()),
 414                 llsizingtypes: RefCell::new(FnvHashMap()),
 415                 adt_reprs: RefCell::new(FnvHashMap()),
 416                 type_hashcodes: RefCell::new(FnvHashMap()),
 417                 int_type: Type::from_ref(ptr::null_mut()),
 418                 opaque_vec_type: Type::from_ref(ptr::null_mut()),
 419                 builder: BuilderRef_res(llvm::LLVMCreateBuilderInContext(llcx)),
 420                 closure_vals: RefCell::new(FnvHashMap()),
 421                 dbg_cx: dbg_cx,
 422                 eh_personality: RefCell::new(None),
 423                 intrinsics: RefCell::new(FnvHashMap()),
 424                 n_llvm_insns: Cell::new(0),
 425                 trait_cache: RefCell::new(FnvHashMap()),
 426             };
 427
 428             local_ccx.int_type = Type::int(&local_ccx.dummy_ccx(shared));
 429             local_ccx.opaque_vec_type = Type::opaque_vec(&local_ccx.dummy_ccx(shared));
 430
 431             // Done mutating local_ccx directly.  (The rest of the
 432             // initialization goes through RefCell.)
 433             {
 434                 let ccx = local_ccx.dummy_ccx(shared);
 435
 436                 let mut str_slice_ty = Type::named_struct(&ccx, "str_slice");
 437                 str_slice_ty.set_struct_body(&[Type::i8p(&ccx), ccx.int_type()], false);
 438                 ccx.tn().associate_type("str_slice", &str_slice_ty);
 439
 440                 if ccx.sess().count_llvm_insns() {
 441                     base::init_insn_ctxt()
 442                 }
 443             }
 444
 445             local_ccx
 446         }
 447     }
 448
 449     /// Create a dummy `CrateContext` from `self` and  the provided
 450     /// `SharedCrateContext`.  This is somewhat dangerous because `self` may
 451     /// not actually be an element of `shared.local_ccxs`, which can cause some
 452     /// operations to panic unexpectedly.
 453     ///
 454     /// This is used in the `LocalCrateContext` constructor to allow calling
 455     /// functions that expect a complete `CrateContext`, even before the local
 456     /// portion is fully initialized and attached to the `SharedCrateContext`.
 457     fn dummy_ccx<'a>(&'a self, shared: &'a SharedCrateContext<'tcx>)
 458                      -> CrateContext<'a, 'tcx> {
 459         CrateContext {
 460             shared: shared,
 461             local: self,
 462             index: !0 as usize,
 463         }
 464     }
 465 }
 466
 467 impl<'b, 'tcx> CrateContext<'b, 'tcx> {
 468     pub fn shared(&self) -> &'b SharedCrateContext<'tcx> {
 469         self.shared
 470     }
 471
 472     pub fn local(&self) -> &'b LocalCrateContext<'tcx> {
 473         self.local
 474     }
 475
 476
 477     /// Get a (possibly) different `CrateContext` from the same
 478     /// `SharedCrateContext`.
 479     pub fn rotate(&self) -> CrateContext<'b, 'tcx> {
 480         self.shared.get_smallest_ccx()
 481     }
 482
 483     /// Either iterate over only `self`, or iterate over all `CrateContext`s in
 484     /// the `SharedCrateContext`.  The iterator produces `(ccx, is_origin)`
 485     /// pairs, where `is_origin` is `true` if `ccx` is `self` and `false`
 486     /// otherwise.  This method is useful for avoiding code duplication in
 487     /// cases where it may or may not be necessary to translate code into every
 488     /// context.
 489     pub fn maybe_iter(&self, iter_all: bool) -> CrateContextMaybeIterator<'b, 'tcx> {
 490         CrateContextMaybeIterator {
 491             shared: self.shared,
 492             index: if iter_all { 0 } else { self.index },
 493             single: !iter_all,
 494             origin: self.index,
 495         }
 496     }
 497
 498
 499     pub fn tcx<'a>(&'a self) -> &'a ty::ctxt<'tcx> {
 500         &self.shared.tcx
 501     }
 502
 503     pub fn sess<'a>(&'a self) -> &'a Session {
 504         &self.shared.tcx.sess
 505     }
 506
 507     pub fn builder<'a>(&'a self) -> Builder<'a, 'tcx> {
 508         Builder::new(self)
 509     }
 510
 511     pub fn raw_builder<'a>(&'a self) -> BuilderRef {
 512         self.local.builder.b
 513     }
 514
 515     pub fn get_intrinsic(&self, key: & &'static str) -> ValueRef {
 516         if let Some(v) = self.intrinsics().borrow().get(key).cloned() {
 517             return v;
 518         }
 519         match declare_intrinsic(self, key) {
 520             Some(v) => return v,
 521             None => panic!()
 522         }
 523     }
 524
 525     pub fn is_split_stack_supported(&self) -> bool {
 526         self.sess().target.target.options.morestack
 527     }
 528
 529
 530     pub fn llmod(&self) -> ModuleRef {
 531         self.local.llmod
 532     }
 533
 534     pub fn llcx(&self) -> ContextRef {
 535         self.local.llcx
 536     }
 537
 538     pub fn td<'a>(&'a self) -> &'a TargetData {
 539         &self.local.td
 540     }
 541
 542     pub fn tn<'a>(&'a self) -> &'a TypeNames {
 543         &self.local.tn
 544     }
 545
 546     pub fn externs<'a>(&'a self) -> &'a RefCell<ExternMap> {
 547         &self.local.externs
 548     }
 549
 550     pub fn item_vals<'a>(&'a self) -> &'a RefCell<NodeMap<ValueRef>> {
 551         &self.local.item_vals
 552     }
 553
 554     pub fn export_map<'a>(&'a self) -> &'a ExportMap {
 555         &self.shared.export_map
 556     }
 557
 558     pub fn reachable<'a>(&'a self) -> &'a NodeSet {
 559         &self.shared.reachable
 560     }
 561
 562     pub fn item_symbols<'a>(&'a self) -> &'a RefCell<NodeMap<String>> {
 563         &self.shared.item_symbols
 564     }
 565
 566     pub fn link_meta<'a>(&'a self) -> &'a LinkMeta {
 567         &self.shared.link_meta
 568     }
 569
 570     pub fn needs_unwind_cleanup_cache(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, bool>> {
 571         &self.local.needs_unwind_cleanup_cache
 572     }
 573
 574     pub fn fn_pointer_shims(&self) -> &RefCell<FnvHashMap<Ty<'tcx>, ValueRef>> {
 575         &self.local.fn_pointer_shims
 576     }
 577
 578     pub fn drop_glues<'a>(&'a self) -> &'a RefCell<FnvHashMap<DropGlueKind<'tcx>, ValueRef>> {
 579         &self.local.drop_glues
 580     }
 581
 582     pub fn external<'a>(&'a self) -> &'a RefCell<DefIdMap<Option<ast::NodeId>>> {
 583         &self.local.external
 584     }
 585
 586     pub fn external_srcs<'a>(&'a self) -> &'a RefCell<NodeMap<ast::DefId>> {
 587         &self.local.external_srcs
 588     }
 589
 590     pub fn monomorphized<'a>(&'a self) -> &'a RefCell<FnvHashMap<MonoId<'tcx>, ValueRef>> {
 591         &self.local.monomorphized
 592     }
 593
 594     pub fn monomorphizing<'a>(&'a self) -> &'a RefCell<DefIdMap<usize>> {
 595         &self.local.monomorphizing
 596     }
 597
 598     pub fn vtables<'a>(&'a self) -> &'a RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>, ValueRef>> {
 599         &self.local.vtables
 600     }
 601
 602     pub fn const_cstr_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<InternedString, ValueRef>> {
 603         &self.local.const_cstr_cache
 604     }
 605
 606     pub fn const_unsized<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
 607         &self.local.const_unsized
 608     }
 609
 610     pub fn const_globals<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
 611         &self.local.const_globals
 612     }
 613
 614     pub fn const_values<'a>(&'a self) -> &'a RefCell<FnvHashMap<(ast::NodeId, &'tcx Substs<'tcx>),
 615                                                                 ValueRef>> {
 616         &self.local.const_values
 617     }
 618
 619     pub fn static_values<'a>(&'a self) -> &'a RefCell<NodeMap<ValueRef>> {
 620         &self.local.static_values
 621     }
 622
 623     pub fn extern_const_values<'a>(&'a self) -> &'a RefCell<DefIdMap<ValueRef>> {
 624         &self.local.extern_const_values
 625     }
 626
 627     pub fn impl_method_cache<'a>(&'a self)
 628             -> &'a RefCell<FnvHashMap<(ast::DefId, ast::Name), ast::DefId>> {
 629         &self.local.impl_method_cache
 630     }
 631
 632     pub fn closure_bare_wrapper_cache<'a>(&'a self) -> &'a RefCell<FnvHashMap<ValueRef, ValueRef>> {
 633         &self.local.closure_bare_wrapper_cache
 634     }
 635
 636     pub fn lltypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
 637         &self.local.lltypes
 638     }
 639
 640     pub fn llsizingtypes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Type>> {
 641         &self.local.llsizingtypes
 642     }
 643
 644     pub fn adt_reprs<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, Rc<adt::Repr<'tcx>>>> {
 645         &self.local.adt_reprs
 646     }
 647
 648     pub fn symbol_hasher<'a>(&'a self) -> &'a RefCell<Sha256> {
 649         &self.shared.symbol_hasher
 650     }
 651
 652     pub fn type_hashcodes<'a>(&'a self) -> &'a RefCell<FnvHashMap<Ty<'tcx>, String>> {
 653         &self.local.type_hashcodes
 654     }
 655
 656     pub fn stats<'a>(&'a self) -> &'a Stats {
 657         &self.shared.stats
 658     }
 659
 660     pub fn available_monomorphizations<'a>(&'a self) -> &'a RefCell<FnvHashSet<String>> {
 661         &self.shared.available_monomorphizations
 662     }
 663
 664     pub fn available_drop_glues(&self) -> &RefCell<FnvHashMap<DropGlueKind<'tcx>, String>> {
 665         &self.shared.available_drop_glues
 666     }
 667
 668     pub fn int_type(&self) -> Type {
 669         self.local.int_type
 670     }
 671
 672     pub fn opaque_vec_type(&self) -> Type {
 673         self.local.opaque_vec_type
 674     }
 675
 676     pub fn closure_vals<'a>(&'a self) -> &'a RefCell<FnvHashMap<MonoId<'tcx>, ValueRef>> {
 677         &self.local.closure_vals
 678     }
 679
 680     pub fn dbg_cx<'a>(&'a self) -> &'a Option<debuginfo::CrateDebugContext<'tcx>> {
 681         &self.local.dbg_cx
 682     }
 683
 684     pub fn eh_personality<'a>(&'a self) -> &'a RefCell<Option<ValueRef>> {
 685         &self.local.eh_personality
 686     }
 687
 688     fn intrinsics<'a>(&'a self) -> &'a RefCell<FnvHashMap<&'static str, ValueRef>> {
 689         &self.local.intrinsics
 690     }
 691
 692     pub fn count_llvm_insn(&self) {
 693         self.local.n_llvm_insns.set(self.local.n_llvm_insns.get() + 1);
 694     }
 695
 696     pub fn trait_cache(&self) -> &RefCell<FnvHashMap<ty::PolyTraitRef<'tcx>,
 697                                                      traits::Vtable<'tcx, ()>>> {
 698         &self.local.trait_cache
 699     }
 700
 701     /// Return exclusive upper bound on object size.
 702     ///
 703     /// The theoretical maximum object size is defined as the maximum positive `int` value. This
 704     /// ensures that the `offset` semantics remain well-defined by allowing it to correctly index
 705     /// every address within an object along with one byte past the end, along with allowing `int`
 706     /// to store the difference between any two pointers into an object.
 707     ///
 708     /// The upper bound on 64-bit currently needs to be lower because LLVM uses a 64-bit integer to
 709     /// represent object size in bits. It would need to be 1 << 61 to account for this, but is
 710     /// currently conservatively bounded to 1 << 47 as that is enough to cover the current usable
 711     /// address space on 64-bit ARMv8 and x86_64.
 712     pub fn obj_size_bound(&self) -> u64 {
 713         match &self.sess().target.target.target_pointer_width[..] {
 714             "32" => 1 << 31,
 715             "64" => 1 << 47,
 716             _ => unreachable!() // error handled by config::build_target_config
 717         }
 718     }
 719
 720     pub fn report_overbig_object(&self, obj: Ty<'tcx>) -> ! {
 721         self.sess().fatal(
 722             &format!("the type `{}` is too big for the current architecture",
 723                     obj.repr(self.tcx())))
 724     }
 725
 726     pub fn check_overflow(&self) -> bool {
 727         self.shared.check_overflow
 728     }
 729
 730     pub fn check_drop_flag_for_sanity(&self) -> bool {
 731         // This controls whether we emit a conditional llvm.debugtrap
 732         // guarded on whether the dropflag is one of its (two) valid
 733         // values.
 734         self.shared.check_drop_flag_for_sanity
 735     }
 736 }
 737
 738 /// Declare any llvm intrinsics that you might need
 739 fn declare_intrinsic(ccx: &CrateContext, key: & &'static str) -> Option<ValueRef> {
 740     macro_rules! ifn {
 741         ($name:expr, fn() -> $ret:expr) => (
 742             if *key == $name {
 743                 let f = declare::declare_cfn(ccx, $name, Type::func(&[], &$ret),
 744                                              ty::mk_nil(ccx.tcx()));
 745                 ccx.intrinsics().borrow_mut().insert($name, f.clone());
 746                 return Some(f);
 747             }
 748         );
 749         ($name:expr, fn($($arg:expr),*) -> $ret:expr) => (
 750             if *key == $name {
 751                 let f = declare::declare_cfn(ccx, $name, Type::func(&[$($arg),*], &$ret),
 752                                              ty::mk_nil(ccx.tcx()));
 753                 ccx.intrinsics().borrow_mut().insert($name, f.clone());
 754                 return Some(f);
 755             }
 756         )
 757     }
 758     macro_rules! mk_struct {
 759         ($($field_ty:expr),*) => (Type::struct_(ccx, &[$($field_ty),*], false))
 760     }
 761
 762     let i8p = Type::i8p(ccx);
 763     let void = Type::void(ccx);
 764     let i1 = Type::i1(ccx);
 765     let t_i8 = Type::i8(ccx);
 766     let t_i16 = Type::i16(ccx);
 767     let t_i32 = Type::i32(ccx);
 768     let t_i64 = Type::i64(ccx);
 769     let t_f32 = Type::f32(ccx);
 770     let t_f64 = Type::f64(ccx);
 771
 772     ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
 773     ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
 774     ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
 775     ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
 776     ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
 777     ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);
 778
 779     ifn!("llvm.trap", fn() -> void);
 780     ifn!("llvm.debugtrap", fn() -> void);
 781     ifn!("llvm.frameaddress", fn(t_i32) -> i8p);
 782
 783     ifn!("llvm.powi.f32", fn(t_f32, t_i32) -> t_f32);
 784     ifn!("llvm.powi.f64", fn(t_f64, t_i32) -> t_f64);
 785     ifn!("llvm.pow.f32", fn(t_f32, t_f32) -> t_f32);
 786     ifn!("llvm.pow.f64", fn(t_f64, t_f64) -> t_f64);
 787
 788     ifn!("llvm.sqrt.f32", fn(t_f32) -> t_f32);
 789     ifn!("llvm.sqrt.f64", fn(t_f64) -> t_f64);
 790     ifn!("llvm.sin.f32", fn(t_f32) -> t_f32);
 791     ifn!("llvm.sin.f64", fn(t_f64) -> t_f64);
 792     ifn!("llvm.cos.f32", fn(t_f32) -> t_f32);
 793     ifn!("llvm.cos.f64", fn(t_f64) -> t_f64);
 794     ifn!("llvm.exp.f32", fn(t_f32) -> t_f32);
 795     ifn!("llvm.exp.f64", fn(t_f64) -> t_f64);
 796     ifn!("llvm.exp2.f32", fn(t_f32) -> t_f32);
 797     ifn!("llvm.exp2.f64", fn(t_f64) -> t_f64);
 798     ifn!("llvm.log.f32", fn(t_f32) -> t_f32);
 799     ifn!("llvm.log.f64", fn(t_f64) -> t_f64);
 800     ifn!("llvm.log10.f32", fn(t_f32) -> t_f32);
 801     ifn!("llvm.log10.f64", fn(t_f64) -> t_f64);
 802     ifn!("llvm.log2.f32", fn(t_f32) -> t_f32);
 803     ifn!("llvm.log2.f64", fn(t_f64) -> t_f64);
 804
 805     ifn!("llvm.fma.f32", fn(t_f32, t_f32, t_f32) -> t_f32);
 806     ifn!("llvm.fma.f64", fn(t_f64, t_f64, t_f64) -> t_f64);
 807
 808     ifn!("llvm.fabs.f32", fn(t_f32) -> t_f32);
 809     ifn!("llvm.fabs.f64", fn(t_f64) -> t_f64);
 810
 811     ifn!("llvm.floor.f32", fn(t_f32) -> t_f32);
 812     ifn!("llvm.floor.f64", fn(t_f64) -> t_f64);
 813     ifn!("llvm.ceil.f32", fn(t_f32) -> t_f32);
 814     ifn!("llvm.ceil.f64", fn(t_f64) -> t_f64);
 815     ifn!("llvm.trunc.f32", fn(t_f32) -> t_f32);
 816     ifn!("llvm.trunc.f64", fn(t_f64) -> t_f64);
 817
 818     ifn!("llvm.rint.f32", fn(t_f32) -> t_f32);
 819     ifn!("llvm.rint.f64", fn(t_f64) -> t_f64);
 820     ifn!("llvm.nearbyint.f32", fn(t_f32) -> t_f32);
 821     ifn!("llvm.nearbyint.f64", fn(t_f64) -> t_f64);
 822
 823     ifn!("llvm.ctpop.i8", fn(t_i8) -> t_i8);
 824     ifn!("llvm.ctpop.i16", fn(t_i16) -> t_i16);
 825     ifn!("llvm.ctpop.i32", fn(t_i32) -> t_i32);
 826     ifn!("llvm.ctpop.i64", fn(t_i64) -> t_i64);
 827
 828     ifn!("llvm.ctlz.i8", fn(t_i8 , i1) -> t_i8);
 829     ifn!("llvm.ctlz.i16", fn(t_i16, i1) -> t_i16);
 830     ifn!("llvm.ctlz.i32", fn(t_i32, i1) -> t_i32);
 831     ifn!("llvm.ctlz.i64", fn(t_i64, i1) -> t_i64);
 832
 833     ifn!("llvm.cttz.i8", fn(t_i8 , i1) -> t_i8);
 834     ifn!("llvm.cttz.i16", fn(t_i16, i1) -> t_i16);
 835     ifn!("llvm.cttz.i32", fn(t_i32, i1) -> t_i32);
 836     ifn!("llvm.cttz.i64", fn(t_i64, i1) -> t_i64);
 837
 838     ifn!("llvm.bswap.i16", fn(t_i16) -> t_i16);
 839     ifn!("llvm.bswap.i32", fn(t_i32) -> t_i32);
 840     ifn!("llvm.bswap.i64", fn(t_i64) -> t_i64);
 841
 842     ifn!("llvm.sadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
 843     ifn!("llvm.sadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
 844     ifn!("llvm.sadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
 845     ifn!("llvm.sadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
 846
 847     ifn!("llvm.uadd.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
 848     ifn!("llvm.uadd.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
 849     ifn!("llvm.uadd.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
 850     ifn!("llvm.uadd.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
 851
 852     ifn!("llvm.ssub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
 853     ifn!("llvm.ssub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
 854     ifn!("llvm.ssub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
 855     ifn!("llvm.ssub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
 856
 857     ifn!("llvm.usub.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
 858     ifn!("llvm.usub.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
 859     ifn!("llvm.usub.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
 860     ifn!("llvm.usub.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
 861
 862     ifn!("llvm.smul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
 863     ifn!("llvm.smul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
 864     ifn!("llvm.smul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
 865     ifn!("llvm.smul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
 866
 867     ifn!("llvm.umul.with.overflow.i8", fn(t_i8, t_i8) -> mk_struct!{t_i8, i1});
 868     ifn!("llvm.umul.with.overflow.i16", fn(t_i16, t_i16) -> mk_struct!{t_i16, i1});
 869     ifn!("llvm.umul.with.overflow.i32", fn(t_i32, t_i32) -> mk_struct!{t_i32, i1});
 870     ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
 871
 872     ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
 873     ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);
 874
 875     ifn!("llvm.expect.i1", fn(i1, i1) -> i1);
 876     ifn!("llvm.assume", fn(i1) -> void);
 877
 878     // Some intrinsics were introduced in later versions of LLVM, but they have
 879     // fallbacks in libc or libm and such. Currently, all of these intrinsics
 880     // were introduced in LLVM 3.4, so we case on that.
 881     macro_rules! compatible_ifn {
 882         ($name:expr, $cname:ident ($($arg:expr),*) -> $ret:expr) => (
 883             ifn!($name, fn($($arg),*) -> $ret);
 884         )
 885     }
 886
 887     compatible_ifn!("llvm.copysign.f32", copysignf(t_f32, t_f32) -> t_f32);
 888     compatible_ifn!("llvm.copysign.f64", copysign(t_f64, t_f64) -> t_f64);
 889     compatible_ifn!("llvm.round.f32", roundf(t_f32) -> t_f32);
 890     compatible_ifn!("llvm.round.f64", round(t_f64) -> t_f64);
 891
 892
 893     if ccx.sess().opts.debuginfo != NoDebugInfo {
 894         ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void);
 895         ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void);
 896     }
 897     return None;
 898 }