1 // Copyright 2016 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.
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.
11 //! Walks the crate looking for items/impl-items/trait-items that have
12 //! either a `rustc_symbol_name` or `rustc_item_path` attribute and
13 //! generates an error giving, respectively, the symbol name or
14 //! item-path. This is used for unit testing the code that generates
15 //! paths etc in all kinds of annoying scenarios.
20 use context::{CrateContext, SharedCrateContext};
23 use glue::DropGlueKind;
25 use monomorphize::{self, Instance};
26 use rustc::dep_graph::DepNode;
28 use rustc::hir::def_id::DefId;
29 use rustc::ty::{self, Ty, TyCtxt, TypeFoldable};
30 use rustc::ty::subst::Substs;
31 use rustc_const_eval::fatal_const_eval_err;
32 use syntax::ast::{self, NodeId};
36 use abi::{Abi, FnType};
37 use back::symbol_names;
41 #[derive(PartialEq, Eq, Clone, Copy, Debug, Hash)]
42 pub enum TransItem<'tcx> {
43 DropGlue(DropGlueKind<'tcx>),
48 /// Describes how a translation item will be instantiated in object files.
49 #[derive(PartialEq, Eq, Clone, Copy, Debug, Hash)]
50 pub enum InstantiationMode {
51 /// There will be exactly one instance of the given TransItem. It will have
52 /// external linkage so that it can be linked to from other codegen units.
55 /// Each codegen unit containing a reference to the given TransItem will
56 /// have its own private copy of the function (with internal linkage).
60 impl<'a, 'tcx> TransItem<'tcx> {
62 pub fn define(&self, ccx: &CrateContext<'a, 'tcx>) {
63 debug!("BEGIN IMPLEMENTING '{} ({})' in cgu {}",
64 self.to_string(ccx.tcx()),
66 ccx.codegen_unit().name());
68 // (*) This code executes in the context of a dep-node for the
69 // entire CGU. In some cases, we introduce dep-nodes for
70 // particular items that we are translating (these nodes will
71 // have read edges coming into the CGU node). These smaller
72 // nodes are not needed for correctness -- we always
73 // invalidate an entire CGU at a time -- but they enable
74 // finer-grained testing, since you can write tests that check
75 // that the incoming edges to a particular fn are from a
79 TransItem::Static(node_id) => {
80 let def_id = ccx.tcx().hir.local_def_id(node_id);
81 let _task = ccx.tcx().dep_graph.in_task(DepNode::TransCrateItem(def_id)); // (*)
82 let item = ccx.tcx().hir.expect_item(node_id);
83 if let hir::ItemStatic(_, m, _) = item.node {
84 match consts::trans_static(&ccx, m, item.id, &item.attrs) {
85 Ok(_) => { /* Cool, everything's alright. */ },
87 // FIXME: shouldn't this be a `span_err`?
89 ccx.tcx(), &err, item.span, "static");
93 span_bug!(item.span, "Mismatch between hir::Item type and TransItem type")
96 TransItem::Fn(instance) => {
97 let _task = ccx.tcx().dep_graph.in_task(
98 DepNode::TransCrateItem(instance.def)); // (*)
100 base::trans_instance(&ccx, instance);
102 TransItem::DropGlue(dg) => {
103 glue::implement_drop_glue(&ccx, dg);
107 debug!("END IMPLEMENTING '{} ({})' in cgu {}",
108 self.to_string(ccx.tcx()),
109 self.to_raw_string(),
110 ccx.codegen_unit().name());
113 pub fn predefine(&self,
114 ccx: &CrateContext<'a, 'tcx>,
115 linkage: llvm::Linkage) {
116 debug!("BEGIN PREDEFINING '{} ({})' in cgu {}",
117 self.to_string(ccx.tcx()),
118 self.to_raw_string(),
119 ccx.codegen_unit().name());
121 let symbol_name = ccx.symbol_map()
122 .get_or_compute(ccx.shared(), *self);
124 debug!("symbol {}", &symbol_name);
127 TransItem::Static(node_id) => {
128 TransItem::predefine_static(ccx, node_id, linkage, &symbol_name);
130 TransItem::Fn(instance) => {
131 TransItem::predefine_fn(ccx, instance, linkage, &symbol_name);
133 TransItem::DropGlue(dg) => {
134 TransItem::predefine_drop_glue(ccx, dg, linkage, &symbol_name);
138 debug!("END PREDEFINING '{} ({})' in cgu {}",
139 self.to_string(ccx.tcx()),
140 self.to_raw_string(),
141 ccx.codegen_unit().name());
144 fn predefine_static(ccx: &CrateContext<'a, 'tcx>,
145 node_id: ast::NodeId,
146 linkage: llvm::Linkage,
148 let def_id = ccx.tcx().hir.local_def_id(node_id);
149 let ty = ccx.tcx().item_type(def_id);
150 let llty = type_of::type_of(ccx, ty);
152 let g = declare::define_global(ccx, symbol_name, llty).unwrap_or_else(|| {
153 ccx.sess().span_fatal(ccx.tcx().hir.span(node_id),
154 &format!("symbol `{}` is already defined", symbol_name))
157 unsafe { llvm::LLVMRustSetLinkage(g, linkage) };
159 let instance = Instance::mono(ccx.shared(), def_id);
160 ccx.instances().borrow_mut().insert(instance, g);
161 ccx.statics().borrow_mut().insert(g, def_id);
164 fn predefine_fn(ccx: &CrateContext<'a, 'tcx>,
165 instance: Instance<'tcx>,
166 linkage: llvm::Linkage,
168 assert!(!instance.substs.needs_infer() &&
169 !instance.substs.has_param_types());
171 let item_ty = ccx.tcx().item_type(instance.def);
172 let item_ty = ccx.tcx().erase_regions(&item_ty);
173 let mono_ty = monomorphize::apply_param_substs(ccx.shared(), instance.substs, &item_ty);
175 let attrs = ccx.tcx().get_attrs(instance.def);
176 let lldecl = declare::declare_fn(ccx, symbol_name, mono_ty);
177 unsafe { llvm::LLVMRustSetLinkage(lldecl, linkage) };
178 base::set_link_section(ccx, lldecl, &attrs);
179 if linkage == llvm::Linkage::LinkOnceODRLinkage ||
180 linkage == llvm::Linkage::WeakODRLinkage {
181 llvm::SetUniqueComdat(ccx.llmod(), lldecl);
184 if let ty::TyClosure(..) = mono_ty.sty {
185 // set an inline hint for all closures
186 attributes::inline(lldecl, attributes::InlineAttr::Hint);
189 attributes::from_fn_attrs(ccx, &attrs, lldecl);
191 ccx.instances().borrow_mut().insert(instance, lldecl);
194 fn predefine_drop_glue(ccx: &CrateContext<'a, 'tcx>,
195 dg: glue::DropGlueKind<'tcx>,
196 linkage: llvm::Linkage,
199 assert_eq!(dg.ty(), glue::get_drop_glue_type(ccx.shared(), dg.ty()));
202 let sig = tcx.mk_fn_sig(
203 iter::once(tcx.mk_mut_ptr(t)),
206 hir::Unsafety::Normal,
210 debug!("predefine_drop_glue: sig={}", sig);
212 let fn_ty = FnType::new(ccx, sig, &[]);
213 let llfnty = fn_ty.llvm_type(ccx);
215 assert!(declare::get_defined_value(ccx, symbol_name).is_none());
216 let llfn = declare::declare_cfn(ccx, symbol_name, llfnty);
217 unsafe { llvm::LLVMRustSetLinkage(llfn, linkage) };
218 if linkage == llvm::Linkage::LinkOnceODRLinkage ||
219 linkage == llvm::Linkage::WeakODRLinkage {
220 llvm::SetUniqueComdat(ccx.llmod(), llfn);
222 attributes::set_frame_pointer_elimination(ccx, llfn);
223 ccx.drop_glues().borrow_mut().insert(dg, (llfn, fn_ty));
226 pub fn compute_symbol_name(&self,
227 scx: &SharedCrateContext<'a, 'tcx>) -> String {
229 TransItem::Fn(instance) => instance.symbol_name(scx),
230 TransItem::Static(node_id) => {
231 let def_id = scx.tcx().hir.local_def_id(node_id);
232 Instance::mono(scx, def_id).symbol_name(scx)
234 TransItem::DropGlue(dg) => {
235 let prefix = match dg {
236 DropGlueKind::Ty(_) => "drop",
237 DropGlueKind::TyContents(_) => "drop_contents",
239 symbol_names::exported_name_from_type_and_prefix(scx, dg.ty(), prefix)
244 pub fn is_from_extern_crate(&self) -> bool {
246 TransItem::Fn(ref instance) => !instance.def.is_local(),
247 TransItem::DropGlue(..) |
248 TransItem::Static(..) => false,
252 pub fn instantiation_mode(&self,
253 tcx: TyCtxt<'a, 'tcx, 'tcx>)
254 -> InstantiationMode {
256 TransItem::Fn(ref instance) => {
257 if self.explicit_linkage(tcx).is_none() &&
258 (common::is_closure(tcx, instance.def) ||
259 attr::requests_inline(&tcx.get_attrs(instance.def)[..])) {
260 InstantiationMode::LocalCopy
262 InstantiationMode::GloballyShared
265 TransItem::DropGlue(..) => InstantiationMode::LocalCopy,
266 TransItem::Static(..) => InstantiationMode::GloballyShared,
270 pub fn is_generic_fn(&self) -> bool {
272 TransItem::Fn(ref instance) => {
273 instance.substs.types().next().is_some()
275 TransItem::DropGlue(..) |
276 TransItem::Static(..) => false,
280 pub fn explicit_linkage(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Option<llvm::Linkage> {
281 let def_id = match *self {
282 TransItem::Fn(ref instance) => instance.def,
283 TransItem::Static(node_id) => tcx.hir.local_def_id(node_id),
284 TransItem::DropGlue(..) => return None,
287 let attributes = tcx.get_attrs(def_id);
288 if let Some(name) = attr::first_attr_value_str_by_name(&attributes, "linkage") {
289 if let Some(linkage) = base::llvm_linkage_by_name(&name.as_str()) {
292 let span = tcx.hir.span_if_local(def_id);
293 if let Some(span) = span {
294 tcx.sess.span_fatal(span, "invalid linkage specified")
296 tcx.sess.fatal(&format!("invalid linkage specified: {}", name))
304 pub fn to_string(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> String {
305 let hir_map = &tcx.hir;
308 TransItem::DropGlue(dg) => {
309 let mut s = String::with_capacity(32);
311 DropGlueKind::Ty(_) => s.push_str("drop-glue "),
312 DropGlueKind::TyContents(_) => s.push_str("drop-glue-contents "),
314 let printer = DefPathBasedNames::new(tcx, false, false);
315 printer.push_type_name(dg.ty(), &mut s);
318 TransItem::Fn(instance) => {
319 to_string_internal(tcx, "fn ", instance)
321 TransItem::Static(node_id) => {
322 let def_id = hir_map.local_def_id(node_id);
323 let instance = Instance::new(def_id, tcx.intern_substs(&[]));
324 to_string_internal(tcx, "static ", instance)
328 fn to_string_internal<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
330 instance: Instance<'tcx>)
332 let mut result = String::with_capacity(32);
333 result.push_str(prefix);
334 let printer = DefPathBasedNames::new(tcx, false, false);
335 printer.push_instance_as_string(instance, &mut result);
340 pub fn to_raw_string(&self) -> String {
342 TransItem::DropGlue(dg) => {
343 let prefix = match dg {
344 DropGlueKind::Ty(_) => "Ty",
345 DropGlueKind::TyContents(_) => "TyContents",
347 format!("DropGlue({}: {})", prefix, dg.ty() as *const _ as usize)
349 TransItem::Fn(instance) => {
350 format!("Fn({:?}, {})",
352 instance.substs.as_ptr() as usize)
354 TransItem::Static(id) => {
355 format!("Static({:?})", id)
362 //=-----------------------------------------------------------------------------
363 // TransItem String Keys
364 //=-----------------------------------------------------------------------------
366 // The code below allows for producing a unique string key for a trans item.
367 // These keys are used by the handwritten auto-tests, so they need to be
368 // predictable and human-readable.
370 // Note: A lot of this could looks very similar to what's already in the
371 // ppaux module. It would be good to refactor things so we only have one
372 // parameterizable implementation for printing types.
374 /// Same as `unique_type_name()` but with the result pushed onto the given
375 /// `output` parameter.
376 pub struct DefPathBasedNames<'a, 'tcx: 'a> {
377 tcx: TyCtxt<'a, 'tcx, 'tcx>,
378 omit_disambiguators: bool,
379 omit_local_crate_name: bool,
382 impl<'a, 'tcx> DefPathBasedNames<'a, 'tcx> {
383 pub fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>,
384 omit_disambiguators: bool,
385 omit_local_crate_name: bool)
389 omit_disambiguators: omit_disambiguators,
390 omit_local_crate_name: omit_local_crate_name,
394 pub fn push_type_name(&self, t: Ty<'tcx>, output: &mut String) {
396 ty::TyBool => output.push_str("bool"),
397 ty::TyChar => output.push_str("char"),
398 ty::TyStr => output.push_str("str"),
399 ty::TyNever => output.push_str("!"),
400 ty::TyInt(ast::IntTy::Is) => output.push_str("isize"),
401 ty::TyInt(ast::IntTy::I8) => output.push_str("i8"),
402 ty::TyInt(ast::IntTy::I16) => output.push_str("i16"),
403 ty::TyInt(ast::IntTy::I32) => output.push_str("i32"),
404 ty::TyInt(ast::IntTy::I64) => output.push_str("i64"),
405 ty::TyInt(ast::IntTy::I128) => output.push_str("i128"),
406 ty::TyUint(ast::UintTy::Us) => output.push_str("usize"),
407 ty::TyUint(ast::UintTy::U8) => output.push_str("u8"),
408 ty::TyUint(ast::UintTy::U16) => output.push_str("u16"),
409 ty::TyUint(ast::UintTy::U32) => output.push_str("u32"),
410 ty::TyUint(ast::UintTy::U64) => output.push_str("u64"),
411 ty::TyUint(ast::UintTy::U128) => output.push_str("u128"),
412 ty::TyFloat(ast::FloatTy::F32) => output.push_str("f32"),
413 ty::TyFloat(ast::FloatTy::F64) => output.push_str("f64"),
414 ty::TyAdt(adt_def, substs) => {
415 self.push_def_path(adt_def.did, output);
416 self.push_type_params(substs, iter::empty(), output);
418 ty::TyTuple(component_types, _) => {
420 for &component_type in component_types {
421 self.push_type_name(component_type, output);
422 output.push_str(", ");
424 if !component_types.is_empty() {
430 ty::TyRawPtr(ty::TypeAndMut { ty: inner_type, mutbl } ) => {
433 hir::MutImmutable => output.push_str("const "),
434 hir::MutMutable => output.push_str("mut "),
437 self.push_type_name(inner_type, output);
439 ty::TyRef(_, ty::TypeAndMut { ty: inner_type, mutbl }) => {
441 if mutbl == hir::MutMutable {
442 output.push_str("mut ");
445 self.push_type_name(inner_type, output);
447 ty::TyArray(inner_type, len) => {
449 self.push_type_name(inner_type, output);
450 write!(output, "; {}", len).unwrap();
453 ty::TySlice(inner_type) => {
455 self.push_type_name(inner_type, output);
458 ty::TyDynamic(ref trait_data, ..) => {
459 if let Some(principal) = trait_data.principal() {
460 self.push_def_path(principal.def_id(), output);
461 self.push_type_params(principal.skip_binder().substs,
462 trait_data.projection_bounds(),
466 ty::TyFnDef(.., sig) |
467 ty::TyFnPtr(sig) => {
468 if sig.unsafety() == hir::Unsafety::Unsafe {
469 output.push_str("unsafe ");
473 if abi != ::abi::Abi::Rust {
474 output.push_str("extern \"");
475 output.push_str(abi.name());
476 output.push_str("\" ");
479 output.push_str("fn(");
481 let sig = self.tcx.erase_late_bound_regions_and_normalize(&sig);
483 if !sig.inputs().is_empty() {
484 for ¶meter_type in sig.inputs() {
485 self.push_type_name(parameter_type, output);
486 output.push_str(", ");
493 if !sig.inputs().is_empty() {
494 output.push_str(", ...");
496 output.push_str("...");
502 if !sig.output().is_nil() {
503 output.push_str(" -> ");
504 self.push_type_name(sig.output(), output);
507 ty::TyClosure(def_id, ref closure_substs) => {
508 self.push_def_path(def_id, output);
509 let generics = self.tcx.item_generics(self.tcx.closure_base_def_id(def_id));
510 let substs = closure_substs.substs.truncate_to(self.tcx, generics);
511 self.push_type_params(substs, iter::empty(), output);
515 ty::TyProjection(..) |
518 bug!("DefPathBasedNames: Trying to create type name for \
519 unexpected type: {:?}", t);
524 pub fn push_def_path(&self,
526 output: &mut String) {
527 let def_path = self.tcx.def_path(def_id);
530 if !(self.omit_local_crate_name && def_id.is_local()) {
531 output.push_str(&self.tcx.crate_name(def_path.krate).as_str());
532 output.push_str("::");
535 // foo::bar::ItemName::
536 for part in self.tcx.def_path(def_id).data {
537 if self.omit_disambiguators {
538 write!(output, "{}::", part.data.as_interned_str()).unwrap();
540 write!(output, "{}[{}]::",
541 part.data.as_interned_str(),
542 part.disambiguator).unwrap();
551 fn push_type_params<I>(&self,
552 substs: &Substs<'tcx>,
555 where I: Iterator<Item=ty::PolyExistentialProjection<'tcx>>
557 let mut projections = projections.peekable();
558 if substs.types().next().is_none() && projections.peek().is_none() {
564 for type_parameter in substs.types() {
565 self.push_type_name(type_parameter, output);
566 output.push_str(", ");
569 for projection in projections {
570 let projection = projection.skip_binder();
571 let name = &projection.item_name.as_str();
572 output.push_str(name);
573 output.push_str("=");
574 self.push_type_name(projection.ty, output);
575 output.push_str(", ");
584 pub fn push_instance_as_string(&self,
585 instance: Instance<'tcx>,
586 output: &mut String) {
587 self.push_def_path(instance.def, output);
588 self.push_type_params(instance.substs, iter::empty(), output);