1 // Copyright 2012-2014 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 //! # Debug Info Module
13 //! This module serves the purpose of generating debug symbols. We use LLVM's
14 //! [source level debugging](http://llvm.org/docs/SourceLevelDebugging.html)
15 //! features for generating the debug information. The general principle is this:
17 //! Given the right metadata in the LLVM IR, the LLVM code generator is able to
18 //! create DWARF debug symbols for the given code. The
19 //! [metadata](http://llvm.org/docs/LangRef.html#metadata-type) is structured much
20 //! like DWARF *debugging information entries* (DIE), representing type information
21 //! such as datatype layout, function signatures, block layout, variable location
22 //! and scope information, etc. It is the purpose of this module to generate correct
23 //! metadata and insert it into the LLVM IR.
25 //! As the exact format of metadata trees may change between different LLVM
26 //! versions, we now use LLVM
27 //! [DIBuilder](http://llvm.org/docs/doxygen/html/classllvm_1_1DIBuilder.html) to
28 //! create metadata where possible. This will hopefully ease the adaption of this
29 //! module to future LLVM versions.
31 //! The public API of the module is a set of functions that will insert the correct
32 //! metadata into the LLVM IR when called with the right parameters. The module is
33 //! thus driven from an outside client with functions like
34 //! `debuginfo::create_local_var_metadata(bcx: block, local: &ast::local)`.
36 //! Internally the module will try to reuse already created metadata by utilizing a
37 //! cache. The way to get a shared metadata node when needed is thus to just call
38 //! the corresponding function in this module:
40 //! let file_metadata = file_metadata(crate_context, path);
42 //! The function will take care of probing the cache for an existing node for that
45 //! All private state used by the module is stored within either the
46 //! CrateDebugContext struct (owned by the CrateContext) or the FunctionDebugContext
47 //! (owned by the FunctionContext).
49 //! This file consists of three conceptual sections:
50 //! 1. The public interface of the module
51 //! 2. Module-internal metadata creation functions
52 //! 3. Minor utility functions
55 //! ## Recursive Types
57 //! Some kinds of types, such as structs and enums can be recursive. That means that
58 //! the type definition of some type X refers to some other type which in turn
59 //! (transitively) refers to X. This introduces cycles into the type referral graph.
60 //! A naive algorithm doing an on-demand, depth-first traversal of this graph when
61 //! describing types, can get trapped in an endless loop when it reaches such a
64 //! For example, the following simple type for a singly-linked list...
69 //! tail: Option<Box<List>>,
73 //! will generate the following callstack with a naive DFS algorithm:
76 //! describe(t = List)
78 //! describe(t = Option<Box<List>>)
79 //! describe(t = Box<List>)
80 //! describe(t = List) // at the beginning again...
84 //! To break cycles like these, we use "forward declarations". That is, when the
85 //! algorithm encounters a possibly recursive type (any struct or enum), it
86 //! immediately creates a type description node and inserts it into the cache
87 //! *before* describing the members of the type. This type description is just a
88 //! stub (as type members are not described and added to it yet) but it allows the
89 //! algorithm to already refer to the type. After the stub is inserted into the
90 //! cache, the algorithm continues as before. If it now encounters a recursive
91 //! reference, it will hit the cache and does not try to describe the type anew.
93 //! This behaviour is encapsulated in the 'RecursiveTypeDescription' enum, which
94 //! represents a kind of continuation, storing all state needed to continue
95 //! traversal at the type members after the type has been registered with the cache.
96 //! (This implementation approach might be a tad over-engineered and may change in
100 //! ## Source Locations and Line Information
102 //! In addition to data type descriptions the debugging information must also allow
103 //! to map machine code locations back to source code locations in order to be useful.
104 //! This functionality is also handled in this module. The following functions allow
105 //! to control source mappings:
107 //! + set_source_location()
108 //! + clear_source_location()
109 //! + start_emitting_source_locations()
111 //! `set_source_location()` allows to set the current source location. All IR
112 //! instructions created after a call to this function will be linked to the given
113 //! source location, until another location is specified with
114 //! `set_source_location()` or the source location is cleared with
115 //! `clear_source_location()`. In the later case, subsequent IR instruction will not
116 //! be linked to any source location. As you can see, this is a stateful API
117 //! (mimicking the one in LLVM), so be careful with source locations set by previous
118 //! calls. It's probably best to not rely on any specific state being present at a
119 //! given point in code.
121 //! One topic that deserves some extra attention is *function prologues*. At the
122 //! beginning of a function's machine code there are typically a few instructions
123 //! for loading argument values into allocas and checking if there's enough stack
124 //! space for the function to execute. This *prologue* is not visible in the source
125 //! code and LLVM puts a special PROLOGUE END marker into the line table at the
126 //! first non-prologue instruction of the function. In order to find out where the
127 //! prologue ends, LLVM looks for the first instruction in the function body that is
128 //! linked to a source location. So, when generating prologue instructions we have
129 //! to make sure that we don't emit source location information until the 'real'
130 //! function body begins. For this reason, source location emission is disabled by
131 //! default for any new function being translated and is only activated after a call
132 //! to the third function from the list above, `start_emitting_source_locations()`.
133 //! This function should be called right before regularly starting to translate the
134 //! top-level block of the given function.
136 //! There is one exception to the above rule: `llvm.dbg.declare` instruction must be
137 //! linked to the source location of the variable being declared. For function
138 //! parameters these `llvm.dbg.declare` instructions typically occur in the middle
139 //! of the prologue, however, they are ignored by LLVM's prologue detection. The
140 //! `create_argument_metadata()` and related functions take care of linking the
141 //! `llvm.dbg.declare` instructions to the correct source locations even while
142 //! source location emission is still disabled, so there is no need to do anything
143 //! special with source location handling here.
145 //! ## Unique Type Identification
147 //! In order for link-time optimization to work properly, LLVM needs a unique type
148 //! identifier that tells it across compilation units which types are the same as
149 //! others. This type identifier is created by TypeMap::get_unique_type_id_of_type()
150 //! using the following algorithm:
152 //! (1) Primitive types have their name as ID
153 //! (2) Structs, enums and traits have a multipart identifier
155 //! (1) The first part is the SVH (strict version hash) of the crate they were
156 //! originally defined in
158 //! (2) The second part is the ast::NodeId of the definition in their original
161 //! (3) The final part is a concatenation of the type IDs of their concrete type
162 //! arguments if they are generic types.
164 //! (3) Tuple-, pointer and function types are structurally identified, which means
165 //! that they are equivalent if their component types are equivalent (i.e. (int,
166 //! int) is the same regardless in which crate it is used).
168 //! This algorithm also provides a stable ID for types that are defined in one crate
169 //! but instantiated from metadata within another crate. We just have to take care
170 //! to always map crate and node IDs back to the original crate context.
172 //! As a side-effect these unique type IDs also help to solve a problem arising from
173 //! lifetime parameters. Since lifetime parameters are completely omitted in
174 //! debuginfo, more than one `Ty` instance may map to the same debuginfo type
175 //! metadata, that is, some struct `Struct<'a>` may have N instantiations with
176 //! different concrete substitutions for `'a`, and thus there will be N `Ty`
177 //! instances for the type `Struct<'a>` even though it is not generic otherwise.
178 //! Unfortunately this means that we cannot use `ty::type_id()` as cheap identifier
179 //! for type metadata---we have done this in the past, but it led to unnecessary
180 //! metadata duplication in the best case and LLVM assertions in the worst. However,
181 //! the unique type ID as described above *can* be used as identifier. Since it is
182 //! comparatively expensive to construct, though, `ty::type_id()` is still used
183 //! additionally as an optimization for cases where the exact same type has been
184 //! seen before (which is most of the time).
185 use self::VariableAccess::*;
186 use self::VariableKind::*;
187 use self::MemberOffset::*;
188 use self::MemberDescriptionFactory::*;
189 use self::RecursiveTypeDescription::*;
190 use self::EnumDiscriminantInfo::*;
191 use self::DebugLocation::*;
194 use llvm::{ModuleRef, ContextRef, ValueRef};
195 use llvm::debuginfo::*;
196 use metadata::csearch;
197 use middle::subst::{self, Substs};
198 use trans::{self, adt, machine, type_of};
199 use trans::common::*;
200 use trans::_match::{BindingInfo, TrByCopy, TrByMove, TrByRef};
201 use trans::monomorphize;
202 use trans::type_::Type;
203 use middle::ty::{self, Ty, UnboxedClosureTyper};
204 use middle::pat_util;
205 use session::config::{self, FullDebugInfo, LimitedDebugInfo, NoDebugInfo};
206 use util::nodemap::{DefIdMap, NodeMap, FnvHashMap, FnvHashSet};
210 use std::ffi::CString;
211 use std::cell::{Cell, RefCell};
213 use std::rc::{Rc, Weak};
214 use syntax::util::interner::Interner;
215 use syntax::codemap::{Span, Pos};
216 use syntax::{ast, codemap, ast_util, ast_map, attr};
217 use syntax::ast_util::PostExpansionMethod;
218 use syntax::parse::token::{self, special_idents};
220 const DW_LANG_RUST: c_uint = 0x9000;
222 #[allow(non_upper_case_globals)]
223 const DW_TAG_auto_variable: c_uint = 0x100;
224 #[allow(non_upper_case_globals)]
225 const DW_TAG_arg_variable: c_uint = 0x101;
227 #[allow(non_upper_case_globals)]
228 const DW_ATE_boolean: c_uint = 0x02;
229 #[allow(non_upper_case_globals)]
230 const DW_ATE_float: c_uint = 0x04;
231 #[allow(non_upper_case_globals)]
232 const DW_ATE_signed: c_uint = 0x05;
233 #[allow(non_upper_case_globals)]
234 const DW_ATE_unsigned: c_uint = 0x07;
235 #[allow(non_upper_case_globals)]
236 const DW_ATE_unsigned_char: c_uint = 0x08;
238 const UNKNOWN_LINE_NUMBER: c_uint = 0;
239 const UNKNOWN_COLUMN_NUMBER: c_uint = 0;
241 // ptr::null() doesn't work :(
242 const UNKNOWN_FILE_METADATA: DIFile = (0 as DIFile);
243 const UNKNOWN_SCOPE_METADATA: DIScope = (0 as DIScope);
245 const FLAGS_NONE: c_uint = 0;
247 //=-----------------------------------------------------------------------------
248 // Public Interface of debuginfo module
249 //=-----------------------------------------------------------------------------
251 #[derive(Copy, Show, Hash, Eq, PartialEq, Clone)]
252 struct UniqueTypeId(ast::Name);
254 // The TypeMap is where the CrateDebugContext holds the type metadata nodes
255 // created so far. The metadata nodes are indexed by UniqueTypeId, and, for
256 // faster lookup, also by Ty. The TypeMap is responsible for creating
258 struct TypeMap<'tcx> {
259 // The UniqueTypeIds created so far
260 unique_id_interner: Interner<Rc<String>>,
261 // A map from UniqueTypeId to debuginfo metadata for that type. This is a 1:1 mapping.
262 unique_id_to_metadata: FnvHashMap<UniqueTypeId, DIType>,
263 // A map from types to debuginfo metadata. This is a N:1 mapping.
264 type_to_metadata: FnvHashMap<Ty<'tcx>, DIType>,
265 // A map from types to UniqueTypeId. This is a N:1 mapping.
266 type_to_unique_id: FnvHashMap<Ty<'tcx>, UniqueTypeId>
269 impl<'tcx> TypeMap<'tcx> {
271 fn new() -> TypeMap<'tcx> {
273 unique_id_interner: Interner::new(),
274 type_to_metadata: FnvHashMap::new(),
275 unique_id_to_metadata: FnvHashMap::new(),
276 type_to_unique_id: FnvHashMap::new(),
280 // Adds a Ty to metadata mapping to the TypeMap. The method will fail if
281 // the mapping already exists.
282 fn register_type_with_metadata<'a>(&mut self,
283 cx: &CrateContext<'a, 'tcx>,
286 if self.type_to_metadata.insert(type_, metadata).is_some() {
287 cx.sess().bug(&format!("Type metadata for Ty '{}' is already in the TypeMap!",
288 ppaux::ty_to_string(cx.tcx(), type_))[]);
292 // Adds a UniqueTypeId to metadata mapping to the TypeMap. The method will
293 // fail if the mapping already exists.
294 fn register_unique_id_with_metadata(&mut self,
296 unique_type_id: UniqueTypeId,
298 if self.unique_id_to_metadata.insert(unique_type_id, metadata).is_some() {
299 let unique_type_id_str = self.get_unique_type_id_as_string(unique_type_id);
300 cx.sess().bug(&format!("Type metadata for unique id '{}' is already in the TypeMap!",
301 &unique_type_id_str[])[]);
305 fn find_metadata_for_type(&self, type_: Ty<'tcx>) -> Option<DIType> {
306 self.type_to_metadata.get(&type_).cloned()
309 fn find_metadata_for_unique_id(&self, unique_type_id: UniqueTypeId) -> Option<DIType> {
310 self.unique_id_to_metadata.get(&unique_type_id).cloned()
313 // Get the string representation of a UniqueTypeId. This method will fail if
314 // the id is unknown.
315 fn get_unique_type_id_as_string(&self, unique_type_id: UniqueTypeId) -> Rc<String> {
316 let UniqueTypeId(interner_key) = unique_type_id;
317 self.unique_id_interner.get(interner_key)
320 // Get the UniqueTypeId for the given type. If the UniqueTypeId for the given
321 // type has been requested before, this is just a table lookup. Otherwise an
322 // ID will be generated and stored for later lookup.
323 fn get_unique_type_id_of_type<'a>(&mut self, cx: &CrateContext<'a, 'tcx>,
324 type_: Ty<'tcx>) -> UniqueTypeId {
326 // basic type -> {:name of the type:}
327 // tuple -> {tuple_(:param-uid:)*}
328 // struct -> {struct_:svh: / :node-id:_<(:param-uid:),*> }
329 // enum -> {enum_:svh: / :node-id:_<(:param-uid:),*> }
330 // enum variant -> {variant_:variant-name:_:enum-uid:}
331 // reference (&) -> {& :pointee-uid:}
332 // mut reference (&mut) -> {&mut :pointee-uid:}
333 // ptr (*) -> {* :pointee-uid:}
334 // mut ptr (*mut) -> {*mut :pointee-uid:}
335 // unique ptr (~) -> {~ :pointee-uid:}
336 // @-ptr (@) -> {@ :pointee-uid:}
337 // sized vec ([T; x]) -> {[:size:] :element-uid:}
338 // unsized vec ([T]) -> {[] :element-uid:}
339 // trait (T) -> {trait_:svh: / :node-id:_<(:param-uid:),*> }
340 // closure -> {<unsafe_> <once_> :store-sigil:
341 // |(:param-uid:),* <,_...>| -> \
342 // :return-type-uid: : (:bounds:)*}
343 // function -> {<unsafe_> <abi_> fn( (:param-uid:)* <,_...> ) -> \
344 // :return-type-uid:}
345 // unique vec box (~[]) -> {HEAP_VEC_BOX<:pointee-uid:>}
346 // gc box -> {GC_BOX<:pointee-uid:>}
347 // projection (<T as U>::V) -> {<:ty-uid: as :trait-uid:> :: :name-uid: }
349 match self.type_to_unique_id.get(&type_).cloned() {
350 Some(unique_type_id) => return unique_type_id,
351 None => { /* generate one */}
354 let mut unique_type_id = String::with_capacity(256);
355 unique_type_id.push('{');
364 push_debuginfo_type_name(cx, type_, false, &mut unique_type_id);
366 ty::ty_enum(def_id, substs) => {
367 unique_type_id.push_str("enum ");
368 from_def_id_and_substs(self, cx, def_id, substs, &mut unique_type_id);
370 ty::ty_struct(def_id, substs) => {
371 unique_type_id.push_str("struct ");
372 from_def_id_and_substs(self, cx, def_id, substs, &mut unique_type_id);
374 ty::ty_tup(ref component_types) if component_types.is_empty() => {
375 push_debuginfo_type_name(cx, type_, false, &mut unique_type_id);
377 ty::ty_tup(ref component_types) => {
378 unique_type_id.push_str("tuple ");
379 for &component_type in component_types.iter() {
380 let component_type_id =
381 self.get_unique_type_id_of_type(cx, component_type);
382 let component_type_id =
383 self.get_unique_type_id_as_string(component_type_id);
384 unique_type_id.push_str(&component_type_id[]);
387 ty::ty_uniq(inner_type) => {
388 unique_type_id.push('~');
389 let inner_type_id = self.get_unique_type_id_of_type(cx, inner_type);
390 let inner_type_id = self.get_unique_type_id_as_string(inner_type_id);
391 unique_type_id.push_str(&inner_type_id[]);
393 ty::ty_ptr(ty::mt { ty: inner_type, mutbl } ) => {
394 unique_type_id.push('*');
395 if mutbl == ast::MutMutable {
396 unique_type_id.push_str("mut");
399 let inner_type_id = self.get_unique_type_id_of_type(cx, inner_type);
400 let inner_type_id = self.get_unique_type_id_as_string(inner_type_id);
401 unique_type_id.push_str(&inner_type_id[]);
403 ty::ty_rptr(_, ty::mt { ty: inner_type, mutbl }) => {
404 unique_type_id.push('&');
405 if mutbl == ast::MutMutable {
406 unique_type_id.push_str("mut");
409 let inner_type_id = self.get_unique_type_id_of_type(cx, inner_type);
410 let inner_type_id = self.get_unique_type_id_as_string(inner_type_id);
411 unique_type_id.push_str(&inner_type_id[]);
413 ty::ty_vec(inner_type, optional_length) => {
414 match optional_length {
416 unique_type_id.push_str(&format!("[{}]", len)[]);
419 unique_type_id.push_str("[]");
423 let inner_type_id = self.get_unique_type_id_of_type(cx, inner_type);
424 let inner_type_id = self.get_unique_type_id_as_string(inner_type_id);
425 unique_type_id.push_str(&inner_type_id[]);
427 ty::ty_trait(ref trait_data) => {
428 unique_type_id.push_str("trait ");
431 ty::erase_late_bound_regions(cx.tcx(),
432 &trait_data.principal);
434 from_def_id_and_substs(self,
438 &mut unique_type_id);
440 ty::ty_projection(ref projection) => {
441 unique_type_id.push_str("<");
443 let self_ty = projection.trait_ref.self_ty();
444 let self_type_id = self.get_unique_type_id_of_type(cx, self_ty);
445 let self_type_id = self.get_unique_type_id_as_string(self_type_id);
446 unique_type_id.push_str(&self_type_id[]);
448 unique_type_id.push_str(" as ");
450 from_def_id_and_substs(self,
452 projection.trait_ref.def_id,
453 projection.trait_ref.substs,
454 &mut unique_type_id);
456 unique_type_id.push_str(">::");
457 unique_type_id.push_str(token::get_name(projection.item_name).get());
459 ty::ty_bare_fn(_, &ty::BareFnTy{ unsafety, abi, ref sig } ) => {
460 if unsafety == ast::Unsafety::Unsafe {
461 unique_type_id.push_str("unsafe ");
464 unique_type_id.push_str(abi.name());
466 unique_type_id.push_str(" fn(");
468 let sig = ty::erase_late_bound_regions(cx.tcx(), sig);
470 for ¶meter_type in sig.inputs.iter() {
471 let parameter_type_id =
472 self.get_unique_type_id_of_type(cx, parameter_type);
473 let parameter_type_id =
474 self.get_unique_type_id_as_string(parameter_type_id);
475 unique_type_id.push_str(¶meter_type_id[]);
476 unique_type_id.push(',');
480 unique_type_id.push_str("...");
483 unique_type_id.push_str(")->");
485 ty::FnConverging(ret_ty) => {
486 let return_type_id = self.get_unique_type_id_of_type(cx, ret_ty);
487 let return_type_id = self.get_unique_type_id_as_string(return_type_id);
488 unique_type_id.push_str(&return_type_id[]);
491 unique_type_id.push_str("!");
495 ty::ty_unboxed_closure(def_id, _, substs) => {
496 let typer = NormalizingUnboxedClosureTyper::new(cx.tcx());
497 let closure_ty = typer.unboxed_closure_type(def_id, substs);
498 self.get_unique_type_id_of_closure_type(cx,
500 &mut unique_type_id);
506 cx.sess().bug(&format!("get_unique_type_id_of_type() - unexpected type: {}, {:?}",
507 &ppaux::ty_to_string(cx.tcx(), type_)[],
512 unique_type_id.push('}');
514 // Trim to size before storing permanently
515 unique_type_id.shrink_to_fit();
517 let key = self.unique_id_interner.intern(Rc::new(unique_type_id));
518 self.type_to_unique_id.insert(type_, UniqueTypeId(key));
520 return UniqueTypeId(key);
522 fn from_def_id_and_substs<'a, 'tcx>(type_map: &mut TypeMap<'tcx>,
523 cx: &CrateContext<'a, 'tcx>,
525 substs: &subst::Substs<'tcx>,
526 output: &mut String) {
527 // First, find out the 'real' def_id of the type. Items inlined from
528 // other crates have to be mapped back to their source.
529 let source_def_id = if def_id.krate == ast::LOCAL_CRATE {
530 match cx.external_srcs().borrow().get(&def_id.node).cloned() {
531 Some(source_def_id) => {
532 // The given def_id identifies the inlined copy of a
533 // type definition, let's take the source of the copy.
542 // Get the crate hash as first part of the identifier.
543 let crate_hash = if source_def_id.krate == ast::LOCAL_CRATE {
544 cx.link_meta().crate_hash.clone()
546 cx.sess().cstore.get_crate_hash(source_def_id.krate)
549 output.push_str(crate_hash.as_str());
550 output.push_str("/");
551 output.push_str(&format!("{:x}", def_id.node)[]);
553 // Maybe check that there is no self type here.
555 let tps = substs.types.get_slice(subst::TypeSpace);
559 for &type_parameter in tps.iter() {
561 type_map.get_unique_type_id_of_type(cx, type_parameter);
563 type_map.get_unique_type_id_as_string(param_type_id);
564 output.push_str(¶m_type_id[]);
573 fn get_unique_type_id_of_closure_type<'a>(&mut self,
574 cx: &CrateContext<'a, 'tcx>,
575 closure_ty: ty::ClosureTy<'tcx>,
576 unique_type_id: &mut String) {
577 let ty::ClosureTy { unsafety,
582 abi: _ } = closure_ty;
583 if unsafety == ast::Unsafety::Unsafe {
584 unique_type_id.push_str("unsafe ");
587 if onceness == ast::Once {
588 unique_type_id.push_str("once ");
592 ty::UniqTraitStore => unique_type_id.push_str("~|"),
593 ty::RegionTraitStore(_, ast::MutMutable) => {
594 unique_type_id.push_str("&mut|")
596 ty::RegionTraitStore(_, ast::MutImmutable) => {
597 unique_type_id.push_str("&|")
601 let sig = ty::erase_late_bound_regions(cx.tcx(), sig);
603 for ¶meter_type in sig.inputs.iter() {
604 let parameter_type_id =
605 self.get_unique_type_id_of_type(cx, parameter_type);
606 let parameter_type_id =
607 self.get_unique_type_id_as_string(parameter_type_id);
608 unique_type_id.push_str(¶meter_type_id[]);
609 unique_type_id.push(',');
613 unique_type_id.push_str("...");
616 unique_type_id.push_str("|->");
619 ty::FnConverging(ret_ty) => {
620 let return_type_id = self.get_unique_type_id_of_type(cx, ret_ty);
621 let return_type_id = self.get_unique_type_id_as_string(return_type_id);
622 unique_type_id.push_str(&return_type_id[]);
625 unique_type_id.push_str("!");
629 unique_type_id.push(':');
631 for bound in bounds.builtin_bounds.iter() {
633 ty::BoundSend => unique_type_id.push_str("Send"),
634 ty::BoundSized => unique_type_id.push_str("Sized"),
635 ty::BoundCopy => unique_type_id.push_str("Copy"),
636 ty::BoundSync => unique_type_id.push_str("Sync"),
638 unique_type_id.push('+');
642 // Get the UniqueTypeId for an enum variant. Enum variants are not really
643 // types of their own, so they need special handling. We still need a
644 // UniqueTypeId for them, since to debuginfo they *are* real types.
645 fn get_unique_type_id_of_enum_variant<'a>(&mut self,
646 cx: &CrateContext<'a, 'tcx>,
650 let enum_type_id = self.get_unique_type_id_of_type(cx, enum_type);
651 let enum_variant_type_id = format!("{}::{}",
652 &self.get_unique_type_id_as_string(enum_type_id)[],
654 let interner_key = self.unique_id_interner.intern(Rc::new(enum_variant_type_id));
655 UniqueTypeId(interner_key)
659 // Returns from the enclosing function if the type metadata with the given
660 // unique id can be found in the type map
661 macro_rules! return_if_metadata_created_in_meantime {
662 ($cx: expr, $unique_type_id: expr) => (
663 match debug_context($cx).type_map
665 .find_metadata_for_unique_id($unique_type_id) {
666 Some(metadata) => return MetadataCreationResult::new(metadata, true),
667 None => { /* proceed normally */ }
673 /// A context object for maintaining all state needed by the debuginfo module.
674 pub struct CrateDebugContext<'tcx> {
675 llcontext: ContextRef,
676 builder: DIBuilderRef,
677 current_debug_location: Cell<DebugLocation>,
678 created_files: RefCell<FnvHashMap<String, DIFile>>,
679 created_enum_disr_types: RefCell<DefIdMap<DIType>>,
681 type_map: RefCell<TypeMap<'tcx>>,
682 namespace_map: RefCell<FnvHashMap<Vec<ast::Name>, Rc<NamespaceTreeNode>>>,
684 // This collection is used to assert that composite types (structs, enums,
685 // ...) have their members only set once:
686 composite_types_completed: RefCell<FnvHashSet<DIType>>,
689 impl<'tcx> CrateDebugContext<'tcx> {
690 pub fn new(llmod: ModuleRef) -> CrateDebugContext<'tcx> {
691 debug!("CrateDebugContext::new");
692 let builder = unsafe { llvm::LLVMDIBuilderCreate(llmod) };
693 // DIBuilder inherits context from the module, so we'd better use the same one
694 let llcontext = unsafe { llvm::LLVMGetModuleContext(llmod) };
695 return CrateDebugContext {
696 llcontext: llcontext,
698 current_debug_location: Cell::new(UnknownLocation),
699 created_files: RefCell::new(FnvHashMap::new()),
700 created_enum_disr_types: RefCell::new(DefIdMap::new()),
701 type_map: RefCell::new(TypeMap::new()),
702 namespace_map: RefCell::new(FnvHashMap::new()),
703 composite_types_completed: RefCell::new(FnvHashSet::new()),
708 pub enum FunctionDebugContext {
709 RegularContext(Box<FunctionDebugContextData>),
711 FunctionWithoutDebugInfo,
714 impl FunctionDebugContext {
715 fn get_ref<'a>(&'a self,
718 -> &'a FunctionDebugContextData {
720 FunctionDebugContext::RegularContext(box ref data) => data,
721 FunctionDebugContext::DebugInfoDisabled => {
722 cx.sess().span_bug(span,
723 FunctionDebugContext::debuginfo_disabled_message());
725 FunctionDebugContext::FunctionWithoutDebugInfo => {
726 cx.sess().span_bug(span,
727 FunctionDebugContext::should_be_ignored_message());
732 fn debuginfo_disabled_message() -> &'static str {
733 "debuginfo: Error trying to access FunctionDebugContext although debug info is disabled!"
736 fn should_be_ignored_message() -> &'static str {
737 "debuginfo: Error trying to access FunctionDebugContext for function that should be \
738 ignored by debug info!"
742 struct FunctionDebugContextData {
743 scope_map: RefCell<NodeMap<DIScope>>,
744 fn_metadata: DISubprogram,
745 argument_counter: Cell<uint>,
746 source_locations_enabled: Cell<bool>,
749 enum VariableAccess<'a> {
750 // The llptr given is an alloca containing the variable's value
751 DirectVariable { alloca: ValueRef },
752 // The llptr given is an alloca containing the start of some pointer chain
753 // leading to the variable's content.
754 IndirectVariable { alloca: ValueRef, address_operations: &'a [ValueRef] }
758 ArgumentVariable(uint /*index*/),
763 /// Create any deferred debug metadata nodes
764 pub fn finalize(cx: &CrateContext) {
765 if cx.dbg_cx().is_none() {
770 let _ = compile_unit_metadata(cx);
772 if needs_gdb_debug_scripts_section(cx) {
773 // Add a .debug_gdb_scripts section to this compile-unit. This will
774 // cause GDB to try and load the gdb_load_rust_pretty_printers.py file,
775 // which activates the Rust pretty printers for binary this section is
777 get_or_insert_gdb_debug_scripts_section_global(cx);
781 llvm::LLVMDIBuilderFinalize(DIB(cx));
782 llvm::LLVMDIBuilderDispose(DIB(cx));
783 // Debuginfo generation in LLVM by default uses a higher
784 // version of dwarf than OS X currently understands. We can
785 // instruct LLVM to emit an older version of dwarf, however,
786 // for OS X to understand. For more info see #11352
787 // This can be overridden using --llvm-opts -dwarf-version,N.
788 if cx.sess().target.target.options.is_like_osx {
789 llvm::LLVMRustAddModuleFlag(cx.llmod(),
790 "Dwarf Version\0".as_ptr() as *const _,
794 // Prevent bitcode readers from deleting the debug info.
795 let ptr = "Debug Info Version\0".as_ptr();
796 llvm::LLVMRustAddModuleFlag(cx.llmod(), ptr as *const _,
797 llvm::LLVMRustDebugMetadataVersion);
801 /// Creates debug information for the given global variable.
803 /// Adds the created metadata nodes directly to the crate's IR.
804 pub fn create_global_var_metadata(cx: &CrateContext,
805 node_id: ast::NodeId,
807 if cx.dbg_cx().is_none() {
811 // Don't create debuginfo for globals inlined from other crates. The other
812 // crate should already contain debuginfo for it. More importantly, the
813 // global might not even exist in un-inlined form anywhere which would lead
814 // to a linker errors.
815 if cx.external_srcs().borrow().contains_key(&node_id) {
819 let var_item = cx.tcx().map.get(node_id);
821 let (ident, span) = match var_item {
822 ast_map::NodeItem(item) => {
824 ast::ItemStatic(..) => (item.ident, item.span),
825 ast::ItemConst(..) => (item.ident, item.span),
829 &format!("debuginfo::\
830 create_global_var_metadata() -
831 Captured var-id refers to \
832 unexpected ast_item variant: {:?}",
837 _ => cx.sess().bug(&format!("debuginfo::create_global_var_metadata() \
838 - Captured var-id refers to unexpected \
839 ast_map variant: {:?}",
843 let (file_metadata, line_number) = if span != codemap::DUMMY_SP {
844 let loc = span_start(cx, span);
845 (file_metadata(cx, &loc.file.name[]), loc.line as c_uint)
847 (UNKNOWN_FILE_METADATA, UNKNOWN_LINE_NUMBER)
850 let is_local_to_unit = is_node_local_to_unit(cx, node_id);
851 let variable_type = ty::node_id_to_type(cx.tcx(), node_id);
852 let type_metadata = type_metadata(cx, variable_type, span);
853 let namespace_node = namespace_for_item(cx, ast_util::local_def(node_id));
854 let var_name = token::get_ident(ident).get().to_string();
856 namespace_node.mangled_name_of_contained_item(&var_name[]);
857 let var_scope = namespace_node.scope;
859 let var_name = CString::from_slice(var_name.as_bytes());
860 let linkage_name = CString::from_slice(linkage_name.as_bytes());
862 llvm::LLVMDIBuilderCreateStaticVariable(DIB(cx),
865 linkage_name.as_ptr(),
875 /// Creates debug information for the given local variable.
877 /// This function assumes that there's a datum for each pattern component of the
878 /// local in `bcx.fcx.lllocals`.
879 /// Adds the created metadata nodes directly to the crate's IR.
880 pub fn create_local_var_metadata(bcx: Block, local: &ast::Local) {
881 if bcx.unreachable.get() || fn_should_be_ignored(bcx.fcx) {
886 let def_map = &cx.tcx().def_map;
887 let locals = bcx.fcx.lllocals.borrow();
889 pat_util::pat_bindings(def_map, &*local.pat, |_, node_id, span, var_ident| {
890 let datum = match locals.get(&node_id) {
891 Some(datum) => datum,
893 bcx.sess().span_bug(span,
894 &format!("no entry in lllocals table for {}",
899 if unsafe { llvm::LLVMIsAAllocaInst(datum.val) } == ptr::null_mut() {
900 cx.sess().span_bug(span, "debuginfo::create_local_var_metadata() - \
901 Referenced variable location is not an alloca!");
904 let scope_metadata = scope_metadata(bcx.fcx, node_id, span);
910 DirectVariable { alloca: datum.val },
916 /// Creates debug information for a variable captured in a closure.
918 /// Adds the created metadata nodes directly to the crate's IR.
919 pub fn create_captured_var_metadata<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
920 node_id: ast::NodeId,
921 env_pointer: ValueRef,
923 captured_by_ref: bool,
925 if bcx.unreachable.get() || fn_should_be_ignored(bcx.fcx) {
931 let ast_item = cx.tcx().map.find(node_id);
933 let variable_ident = match ast_item {
935 cx.sess().span_bug(span, "debuginfo::create_captured_var_metadata: node not found");
937 Some(ast_map::NodeLocal(pat)) | Some(ast_map::NodeArg(pat)) => {
939 ast::PatIdent(_, ref path1, _) => {
946 "debuginfo::create_captured_var_metadata() - \
947 Captured var-id refers to unexpected \
948 ast_map variant: {:?}",
956 &format!("debuginfo::create_captured_var_metadata() - \
957 Captured var-id refers to unexpected \
958 ast_map variant: {:?}",
963 let variable_type = node_id_type(bcx, node_id);
964 let scope_metadata = bcx.fcx.debug_context.get_ref(cx, span).fn_metadata;
966 // env_pointer is the alloca containing the pointer to the environment,
967 // so it's type is **EnvironmentType. In order to find out the type of
968 // the environment we have to "dereference" two times.
969 let llvm_env_data_type = val_ty(env_pointer).element_type().element_type();
970 let byte_offset_of_var_in_env = machine::llelement_offset(cx,
974 let address_operations = unsafe {
975 [llvm::LLVMDIBuilderCreateOpDeref(Type::i64(cx).to_ref()),
976 llvm::LLVMDIBuilderCreateOpPlus(Type::i64(cx).to_ref()),
977 C_i64(cx, byte_offset_of_var_in_env as i64),
978 llvm::LLVMDIBuilderCreateOpDeref(Type::i64(cx).to_ref())]
981 let address_op_count = if captured_by_ref {
982 address_operations.len()
984 address_operations.len() - 1
987 let variable_access = IndirectVariable {
989 address_operations: &address_operations[..address_op_count]
1001 /// Creates debug information for a local variable introduced in the head of a
1002 /// match-statement arm.
1004 /// Adds the created metadata nodes directly to the crate's IR.
1005 pub fn create_match_binding_metadata<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
1006 variable_ident: ast::Ident,
1007 binding: BindingInfo<'tcx>) {
1008 if bcx.unreachable.get() || fn_should_be_ignored(bcx.fcx) {
1012 let scope_metadata = scope_metadata(bcx.fcx, binding.id, binding.span);
1014 [llvm::LLVMDIBuilderCreateOpDeref(bcx.ccx().int_type().to_ref())]
1016 // Regardless of the actual type (`T`) we're always passed the stack slot (alloca)
1017 // for the binding. For ByRef bindings that's a `T*` but for ByMove bindings we
1018 // actually have `T**`. So to get the actual variable we need to dereference once
1019 // more. For ByCopy we just use the stack slot we created for the binding.
1020 let var_access = match binding.trmode {
1021 TrByCopy(llbinding) => DirectVariable {
1024 TrByMove => IndirectVariable {
1025 alloca: binding.llmatch,
1026 address_operations: &aops
1028 TrByRef => DirectVariable {
1029 alloca: binding.llmatch
1042 /// Creates debug information for the given function argument.
1044 /// This function assumes that there's a datum for each pattern component of the
1045 /// argument in `bcx.fcx.lllocals`.
1046 /// Adds the created metadata nodes directly to the crate's IR.
1047 pub fn create_argument_metadata(bcx: Block, arg: &ast::Arg) {
1048 if bcx.unreachable.get() || fn_should_be_ignored(bcx.fcx) {
1052 let def_map = &bcx.tcx().def_map;
1053 let scope_metadata = bcx
1056 .get_ref(bcx.ccx(), arg.pat.span)
1058 let locals = bcx.fcx.lllocals.borrow();
1060 pat_util::pat_bindings(def_map, &*arg.pat, |_, node_id, span, var_ident| {
1061 let datum = match locals.get(&node_id) {
1064 bcx.sess().span_bug(span,
1065 &format!("no entry in lllocals table for {}",
1070 if unsafe { llvm::LLVMIsAAllocaInst(datum.val) } == ptr::null_mut() {
1071 bcx.sess().span_bug(span, "debuginfo::create_argument_metadata() - \
1072 Referenced variable location is not an alloca!");
1075 let argument_index = {
1079 .get_ref(bcx.ccx(), span)
1081 let argument_index = counter.get();
1082 counter.set(argument_index + 1);
1090 DirectVariable { alloca: datum.val },
1091 ArgumentVariable(argument_index),
1096 /// Creates debug information for the given for-loop variable.
1098 /// This function assumes that there's a datum for each pattern component of the
1099 /// loop variable in `bcx.fcx.lllocals`.
1100 /// Adds the created metadata nodes directly to the crate's IR.
1101 pub fn create_for_loop_var_metadata(bcx: Block, pat: &ast::Pat) {
1102 if bcx.unreachable.get() || fn_should_be_ignored(bcx.fcx) {
1106 let def_map = &bcx.tcx().def_map;
1107 let locals = bcx.fcx.lllocals.borrow();
1109 pat_util::pat_bindings(def_map, pat, |_, node_id, span, var_ident| {
1110 let datum = match locals.get(&node_id) {
1111 Some(datum) => datum,
1113 bcx.sess().span_bug(span,
1114 format!("no entry in lllocals table for {}",
1115 node_id).as_slice());
1119 if unsafe { llvm::LLVMIsAAllocaInst(datum.val) } == ptr::null_mut() {
1120 bcx.sess().span_bug(span, "debuginfo::create_for_loop_var_metadata() - \
1121 Referenced variable location is not an alloca!");
1124 let scope_metadata = scope_metadata(bcx.fcx, node_id, span);
1130 DirectVariable { alloca: datum.val },
1136 pub fn get_cleanup_debug_loc_for_ast_node<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
1137 node_id: ast::NodeId,
1141 // A debug location needs two things:
1142 // (1) A span (of which only the beginning will actually be used)
1143 // (2) An AST node-id which will be used to look up the lexical scope
1144 // for the location in the functions scope-map
1146 // This function will calculate the debug location for compiler-generated
1147 // cleanup calls that are executed when control-flow leaves the
1148 // scope identified by `node_id`.
1150 // For everything but block-like things we can simply take id and span of
1151 // the given expression, meaning that from a debugger's view cleanup code is
1152 // executed at the same source location as the statement/expr itself.
1154 // Blocks are a special case. Here we want the cleanup to be linked to the
1155 // closing curly brace of the block. The *scope* the cleanup is executed in
1156 // is up to debate: It could either still be *within* the block being
1157 // cleaned up, meaning that locals from the block are still visible in the
1159 // Or it could be in the scope that the block is contained in, so any locals
1160 // from within the block are already considered out-of-scope and thus not
1161 // accessible in the debugger anymore.
1163 // The current implementation opts for the second option: cleanup of a block
1164 // already happens in the parent scope of the block. The main reason for
1165 // this decision is that scoping becomes controlflow dependent when variable
1166 // shadowing is involved and it's impossible to decide statically which
1167 // scope is actually left when the cleanup code is executed.
1168 // In practice it shouldn't make much of a difference.
1170 let mut cleanup_span = node_span;
1173 // Not all blocks actually have curly braces (e.g. simple closure
1174 // bodies), in which case we also just want to return the span of the
1175 // whole expression.
1176 let code_snippet = cx.sess().codemap().span_to_snippet(node_span);
1177 if let Some(code_snippet) = code_snippet {
1178 let bytes = code_snippet.as_bytes();
1180 if bytes.len() > 0 && &bytes[(bytes.len()-1)..] == b"}" {
1181 cleanup_span = Span {
1182 lo: node_span.hi - codemap::BytePos(1),
1184 expn_id: node_span.expn_id
1196 /// Sets the current debug location at the beginning of the span.
1198 /// Maps to a call to llvm::LLVMSetCurrentDebugLocation(...). The node_id
1199 /// parameter is used to reliably find the correct visibility scope for the code
1201 pub fn set_source_location(fcx: &FunctionContext,
1202 node_id: ast::NodeId,
1204 match fcx.debug_context {
1205 FunctionDebugContext::DebugInfoDisabled => return,
1206 FunctionDebugContext::FunctionWithoutDebugInfo => {
1207 set_debug_location(fcx.ccx, UnknownLocation);
1210 FunctionDebugContext::RegularContext(box ref function_debug_context) => {
1213 debug!("set_source_location: {}", cx.sess().codemap().span_to_string(span));
1215 if function_debug_context.source_locations_enabled.get() {
1216 let loc = span_start(cx, span);
1217 let scope = scope_metadata(fcx, node_id, span);
1219 set_debug_location(cx, DebugLocation::new(scope,
1221 loc.col.to_uint()));
1223 set_debug_location(cx, UnknownLocation);
1229 /// Clears the current debug location.
1231 /// Instructions generated hereafter won't be assigned a source location.
1232 pub fn clear_source_location(fcx: &FunctionContext) {
1233 if fn_should_be_ignored(fcx) {
1237 set_debug_location(fcx.ccx, UnknownLocation);
1240 /// Enables emitting source locations for the given functions.
1242 /// Since we don't want source locations to be emitted for the function prelude,
1243 /// they are disabled when beginning to translate a new function. This functions
1244 /// switches source location emitting on and must therefore be called before the
1245 /// first real statement/expression of the function is translated.
1246 pub fn start_emitting_source_locations(fcx: &FunctionContext) {
1247 match fcx.debug_context {
1248 FunctionDebugContext::RegularContext(box ref data) => {
1249 data.source_locations_enabled.set(true)
1251 _ => { /* safe to ignore */ }
1255 /// Creates the function-specific debug context.
1257 /// Returns the FunctionDebugContext for the function which holds state needed
1258 /// for debug info creation. The function may also return another variant of the
1259 /// FunctionDebugContext enum which indicates why no debuginfo should be created
1260 /// for the function.
1261 pub fn create_function_debug_context<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
1262 fn_ast_id: ast::NodeId,
1263 param_substs: &Substs<'tcx>,
1264 llfn: ValueRef) -> FunctionDebugContext {
1265 if cx.sess().opts.debuginfo == NoDebugInfo {
1266 return FunctionDebugContext::DebugInfoDisabled;
1269 // Clear the debug location so we don't assign them in the function prelude.
1270 // Do this here already, in case we do an early exit from this function.
1271 set_debug_location(cx, UnknownLocation);
1273 if fn_ast_id == ast::DUMMY_NODE_ID {
1274 // This is a function not linked to any source location, so don't
1275 // generate debuginfo for it.
1276 return FunctionDebugContext::FunctionWithoutDebugInfo;
1279 let empty_generics = ast_util::empty_generics();
1281 let fnitem = cx.tcx().map.get(fn_ast_id);
1283 let (ident, fn_decl, generics, top_level_block, span, has_path) = match fnitem {
1284 ast_map::NodeItem(ref item) => {
1285 if contains_nodebug_attribute(item.attrs.as_slice()) {
1286 return FunctionDebugContext::FunctionWithoutDebugInfo;
1290 ast::ItemFn(ref fn_decl, _, _, ref generics, ref top_level_block) => {
1291 (item.ident, &**fn_decl, generics, &**top_level_block, item.span, true)
1294 cx.sess().span_bug(item.span,
1295 "create_function_debug_context: item bound to non-function");
1299 ast_map::NodeImplItem(ref item) => {
1301 ast::MethodImplItem(ref method) => {
1302 if contains_nodebug_attribute(method.attrs.as_slice()) {
1303 return FunctionDebugContext::FunctionWithoutDebugInfo;
1307 method.pe_fn_decl(),
1308 method.pe_generics(),
1313 ast::TypeImplItem(ref typedef) => {
1314 cx.sess().span_bug(typedef.span,
1315 "create_function_debug_context() \
1316 called on associated type?!")
1320 ast_map::NodeExpr(ref expr) => {
1322 ast::ExprClosure(_, _, ref fn_decl, ref top_level_block) => {
1323 let name = format!("fn{}", token::gensym("fn"));
1324 let name = token::str_to_ident(&name[]);
1326 // This is not quite right. It should actually inherit
1327 // the generics of the enclosing function.
1331 // Don't try to lookup the item path:
1334 _ => cx.sess().span_bug(expr.span,
1335 "create_function_debug_context: expected an expr_fn_block here")
1338 ast_map::NodeTraitItem(ref trait_method) => {
1339 match **trait_method {
1340 ast::ProvidedMethod(ref method) => {
1341 if contains_nodebug_attribute(method.attrs.as_slice()) {
1342 return FunctionDebugContext::FunctionWithoutDebugInfo;
1346 method.pe_fn_decl(),
1347 method.pe_generics(),
1354 .bug(&format!("create_function_debug_context: \
1355 unexpected sort of node: {:?}",
1360 ast_map::NodeForeignItem(..) |
1361 ast_map::NodeVariant(..) |
1362 ast_map::NodeStructCtor(..) => {
1363 return FunctionDebugContext::FunctionWithoutDebugInfo;
1365 _ => cx.sess().bug(&format!("create_function_debug_context: \
1366 unexpected sort of node: {:?}",
1370 // This can be the case for functions inlined from another crate
1371 if span == codemap::DUMMY_SP {
1372 return FunctionDebugContext::FunctionWithoutDebugInfo;
1375 let loc = span_start(cx, span);
1376 let file_metadata = file_metadata(cx, &loc.file.name[]);
1378 let function_type_metadata = unsafe {
1379 let fn_signature = get_function_signature(cx,
1384 llvm::LLVMDIBuilderCreateSubroutineType(DIB(cx), file_metadata, fn_signature)
1387 // Get_template_parameters() will append a `<...>` clause to the function
1388 // name if necessary.
1389 let mut function_name = String::from_str(token::get_ident(ident).get());
1390 let template_parameters = get_template_parameters(cx,
1394 &mut function_name);
1396 // There is no ast_map::Path for ast::ExprClosure-type functions. For now,
1397 // just don't put them into a namespace. In the future this could be improved
1398 // somehow (storing a path in the ast_map, or construct a path using the
1399 // enclosing function).
1400 let (linkage_name, containing_scope) = if has_path {
1401 let namespace_node = namespace_for_item(cx, ast_util::local_def(fn_ast_id));
1402 let linkage_name = namespace_node.mangled_name_of_contained_item(
1404 let containing_scope = namespace_node.scope;
1405 (linkage_name, containing_scope)
1407 (function_name.clone(), file_metadata)
1410 // Clang sets this parameter to the opening brace of the function's block,
1411 // so let's do this too.
1412 let scope_line = span_start(cx, top_level_block.span).line;
1414 let is_local_to_unit = is_node_local_to_unit(cx, fn_ast_id);
1416 let function_name = CString::from_slice(function_name.as_bytes());
1417 let linkage_name = CString::from_slice(linkage_name.as_bytes());
1418 let fn_metadata = unsafe {
1419 llvm::LLVMDIBuilderCreateFunction(
1422 function_name.as_ptr(),
1423 linkage_name.as_ptr(),
1426 function_type_metadata,
1429 scope_line as c_uint,
1430 FlagPrototyped as c_uint,
1431 cx.sess().opts.optimize != config::No,
1433 template_parameters,
1437 let scope_map = create_scope_map(cx,
1438 fn_decl.inputs.as_slice(),
1443 // Initialize fn debug context (including scope map and namespace map)
1444 let fn_debug_context = box FunctionDebugContextData {
1445 scope_map: RefCell::new(scope_map),
1446 fn_metadata: fn_metadata,
1447 argument_counter: Cell::new(1),
1448 source_locations_enabled: Cell::new(false),
1453 return FunctionDebugContext::RegularContext(fn_debug_context);
1455 fn get_function_signature<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
1456 fn_ast_id: ast::NodeId,
1457 fn_decl: &ast::FnDecl,
1458 param_substs: &Substs<'tcx>,
1459 error_reporting_span: Span) -> DIArray {
1460 if cx.sess().opts.debuginfo == LimitedDebugInfo {
1461 return create_DIArray(DIB(cx), &[]);
1464 let mut signature = Vec::with_capacity(fn_decl.inputs.len() + 1);
1466 // Return type -- llvm::DIBuilder wants this at index 0
1467 match fn_decl.output {
1468 ast::Return(ref ret_ty) if ret_ty.node == ast::TyTup(vec![]) =>
1469 signature.push(ptr::null_mut()),
1471 assert_type_for_node_id(cx, fn_ast_id, error_reporting_span);
1473 let return_type = ty::node_id_to_type(cx.tcx(), fn_ast_id);
1474 let return_type = monomorphize::apply_param_substs(cx.tcx(),
1477 signature.push(type_metadata(cx, return_type, codemap::DUMMY_SP));
1482 for arg in fn_decl.inputs.iter() {
1483 assert_type_for_node_id(cx, arg.pat.id, arg.pat.span);
1484 let arg_type = ty::node_id_to_type(cx.tcx(), arg.pat.id);
1485 let arg_type = monomorphize::apply_param_substs(cx.tcx(),
1488 signature.push(type_metadata(cx, arg_type, codemap::DUMMY_SP));
1491 return create_DIArray(DIB(cx), &signature[]);
1494 fn get_template_parameters<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
1495 generics: &ast::Generics,
1496 param_substs: &Substs<'tcx>,
1497 file_metadata: DIFile,
1498 name_to_append_suffix_to: &mut String)
1501 let self_type = param_substs.self_ty();
1502 let self_type = monomorphize::normalize_associated_type(cx.tcx(), &self_type);
1504 // Only true for static default methods:
1505 let has_self_type = self_type.is_some();
1507 if !generics.is_type_parameterized() && !has_self_type {
1508 return create_DIArray(DIB(cx), &[]);
1511 name_to_append_suffix_to.push('<');
1513 // The list to be filled with template parameters:
1514 let mut template_params: Vec<DIDescriptor> =
1515 Vec::with_capacity(generics.ty_params.len() + 1);
1519 let actual_self_type = self_type.unwrap();
1520 // Add self type name to <...> clause of function name
1521 let actual_self_type_name = compute_debuginfo_type_name(
1526 name_to_append_suffix_to.push_str(&actual_self_type_name[]);
1528 if generics.is_type_parameterized() {
1529 name_to_append_suffix_to.push_str(",");
1532 // Only create type information if full debuginfo is enabled
1533 if cx.sess().opts.debuginfo == FullDebugInfo {
1534 let actual_self_type_metadata = type_metadata(cx,
1538 let ident = special_idents::type_self;
1540 let ident = token::get_ident(ident);
1541 let name = CString::from_slice(ident.get().as_bytes());
1542 let param_metadata = unsafe {
1543 llvm::LLVMDIBuilderCreateTemplateTypeParameter(
1547 actual_self_type_metadata,
1553 template_params.push(param_metadata);
1557 // Handle other generic parameters
1558 let actual_types = param_substs.types.get_slice(subst::FnSpace);
1559 for (index, &ast::TyParam{ ident, .. }) in generics.ty_params.iter().enumerate() {
1560 let actual_type = actual_types[index];
1561 // Add actual type name to <...> clause of function name
1562 let actual_type_name = compute_debuginfo_type_name(cx,
1565 name_to_append_suffix_to.push_str(&actual_type_name[]);
1567 if index != generics.ty_params.len() - 1 {
1568 name_to_append_suffix_to.push_str(",");
1571 // Again, only create type information if full debuginfo is enabled
1572 if cx.sess().opts.debuginfo == FullDebugInfo {
1573 let actual_type_metadata = type_metadata(cx, actual_type, codemap::DUMMY_SP);
1574 let ident = token::get_ident(ident);
1575 let name = CString::from_slice(ident.get().as_bytes());
1576 let param_metadata = unsafe {
1577 llvm::LLVMDIBuilderCreateTemplateTypeParameter(
1581 actual_type_metadata,
1586 template_params.push(param_metadata);
1590 name_to_append_suffix_to.push('>');
1592 return create_DIArray(DIB(cx), &template_params[]);
1596 //=-----------------------------------------------------------------------------
1597 // Module-Internal debug info creation functions
1598 //=-----------------------------------------------------------------------------
1600 fn is_node_local_to_unit(cx: &CrateContext, node_id: ast::NodeId) -> bool
1602 // The is_local_to_unit flag indicates whether a function is local to the
1603 // current compilation unit (i.e. if it is *static* in the C-sense). The
1604 // *reachable* set should provide a good approximation of this, as it
1605 // contains everything that might leak out of the current crate (by being
1606 // externally visible or by being inlined into something externally visible).
1607 // It might better to use the `exported_items` set from `driver::CrateAnalysis`
1608 // in the future, but (atm) this set is not available in the translation pass.
1609 !cx.reachable().contains(&node_id)
1612 #[allow(non_snake_case)]
1613 fn create_DIArray(builder: DIBuilderRef, arr: &[DIDescriptor]) -> DIArray {
1615 llvm::LLVMDIBuilderGetOrCreateArray(builder, arr.as_ptr(), arr.len() as u32)
1619 fn compile_unit_metadata(cx: &CrateContext) -> DIDescriptor {
1620 let work_dir = &cx.sess().working_dir;
1621 let compile_unit_name = match cx.sess().local_crate_source_file {
1622 None => fallback_path(cx),
1623 Some(ref abs_path) => {
1624 if abs_path.is_relative() {
1625 cx.sess().warn("debuginfo: Invalid path to crate's local root source file!");
1628 match abs_path.path_relative_from(work_dir) {
1629 Some(ref p) if p.is_relative() => {
1630 // prepend "./" if necessary
1632 let prefix: &[u8] = &[dotdot[0], ::std::path::SEP_BYTE];
1633 let mut path_bytes = p.as_vec().to_vec();
1635 if path_bytes.slice_to(2) != prefix &&
1636 path_bytes.slice_to(2) != dotdot {
1637 path_bytes.insert(0, prefix[0]);
1638 path_bytes.insert(1, prefix[1]);
1641 CString::from_vec(path_bytes)
1643 _ => fallback_path(cx)
1649 debug!("compile_unit_metadata: {:?}", compile_unit_name);
1650 let producer = format!("rustc version {}",
1651 (option_env!("CFG_VERSION")).expect("CFG_VERSION"));
1653 let compile_unit_name = compile_unit_name.as_ptr();
1654 let work_dir = CString::from_slice(work_dir.as_vec());
1655 let producer = CString::from_slice(producer.as_bytes());
1657 let split_name = "\0";
1659 llvm::LLVMDIBuilderCreateCompileUnit(
1660 debug_context(cx).builder,
1665 cx.sess().opts.optimize != config::No,
1666 flags.as_ptr() as *const _,
1668 split_name.as_ptr() as *const _)
1671 fn fallback_path(cx: &CrateContext) -> CString {
1672 CString::from_slice(cx.link_meta().crate_name.as_bytes())
1676 fn declare_local<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
1677 variable_ident: ast::Ident,
1678 variable_type: Ty<'tcx>,
1679 scope_metadata: DIScope,
1680 variable_access: VariableAccess,
1681 variable_kind: VariableKind,
1683 let cx: &CrateContext = bcx.ccx();
1685 let filename = span_start(cx, span).file.name.clone();
1686 let file_metadata = file_metadata(cx, &filename[]);
1688 let name = token::get_ident(variable_ident);
1689 let loc = span_start(cx, span);
1690 let type_metadata = type_metadata(cx, variable_type, span);
1692 let (argument_index, dwarf_tag) = match variable_kind {
1693 ArgumentVariable(index) => (index as c_uint, DW_TAG_arg_variable),
1695 CapturedVariable => (0, DW_TAG_auto_variable)
1698 let name = CString::from_slice(name.get().as_bytes());
1699 let (var_alloca, var_metadata) = match variable_access {
1700 DirectVariable { alloca } => (
1703 llvm::LLVMDIBuilderCreateLocalVariable(
1711 cx.sess().opts.optimize != config::No,
1716 IndirectVariable { alloca, address_operations } => (
1719 llvm::LLVMDIBuilderCreateComplexVariable(
1727 address_operations.as_ptr(),
1728 address_operations.len() as c_uint,
1734 set_debug_location(cx, DebugLocation::new(scope_metadata,
1736 loc.col.to_uint()));
1738 let instr = llvm::LLVMDIBuilderInsertDeclareAtEnd(
1744 llvm::LLVMSetInstDebugLocation(trans::build::B(bcx).llbuilder, instr);
1747 match variable_kind {
1748 ArgumentVariable(_) | CapturedVariable => {
1752 .source_locations_enabled
1754 set_debug_location(cx, UnknownLocation);
1756 _ => { /* nothing to do */ }
1760 fn file_metadata(cx: &CrateContext, full_path: &str) -> DIFile {
1761 match debug_context(cx).created_files.borrow().get(full_path) {
1762 Some(file_metadata) => return *file_metadata,
1766 debug!("file_metadata: {}", full_path);
1768 // FIXME (#9639): This needs to handle non-utf8 paths
1769 let work_dir = cx.sess().working_dir.as_str().unwrap();
1771 if full_path.starts_with(work_dir) {
1772 &full_path[(work_dir.len() + 1u)..full_path.len()]
1777 let file_name = CString::from_slice(file_name.as_bytes());
1778 let work_dir = CString::from_slice(work_dir.as_bytes());
1779 let file_metadata = unsafe {
1780 llvm::LLVMDIBuilderCreateFile(DIB(cx), file_name.as_ptr(),
1784 let mut created_files = debug_context(cx).created_files.borrow_mut();
1785 created_files.insert(full_path.to_string(), file_metadata);
1786 return file_metadata;
1789 /// Finds the scope metadata node for the given AST node.
1790 fn scope_metadata(fcx: &FunctionContext,
1791 node_id: ast::NodeId,
1792 error_reporting_span: Span)
1794 let scope_map = &fcx.debug_context
1795 .get_ref(fcx.ccx, error_reporting_span)
1797 match scope_map.borrow().get(&node_id).cloned() {
1798 Some(scope_metadata) => scope_metadata,
1800 let node = fcx.ccx.tcx().map.get(node_id);
1802 fcx.ccx.sess().span_bug(error_reporting_span,
1803 &format!("debuginfo: Could not find scope info for node {:?}",
1809 fn diverging_type_metadata(cx: &CrateContext) -> DIType {
1811 llvm::LLVMDIBuilderCreateBasicType(
1813 "!\0".as_ptr() as *const _,
1820 fn basic_type_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
1821 t: Ty<'tcx>) -> DIType {
1823 debug!("basic_type_metadata: {:?}", t);
1825 let (name, encoding) = match t.sty {
1826 ty::ty_tup(ref elements) if elements.is_empty() =>
1827 ("()".to_string(), DW_ATE_unsigned),
1828 ty::ty_bool => ("bool".to_string(), DW_ATE_boolean),
1829 ty::ty_char => ("char".to_string(), DW_ATE_unsigned_char),
1830 ty::ty_int(int_ty) => match int_ty {
1831 ast::TyIs(_) => ("isize".to_string(), DW_ATE_signed),
1832 ast::TyI8 => ("i8".to_string(), DW_ATE_signed),
1833 ast::TyI16 => ("i16".to_string(), DW_ATE_signed),
1834 ast::TyI32 => ("i32".to_string(), DW_ATE_signed),
1835 ast::TyI64 => ("i64".to_string(), DW_ATE_signed)
1837 ty::ty_uint(uint_ty) => match uint_ty {
1838 ast::TyUs(_) => ("usize".to_string(), DW_ATE_unsigned),
1839 ast::TyU8 => ("u8".to_string(), DW_ATE_unsigned),
1840 ast::TyU16 => ("u16".to_string(), DW_ATE_unsigned),
1841 ast::TyU32 => ("u32".to_string(), DW_ATE_unsigned),
1842 ast::TyU64 => ("u64".to_string(), DW_ATE_unsigned)
1844 ty::ty_float(float_ty) => match float_ty {
1845 ast::TyF32 => ("f32".to_string(), DW_ATE_float),
1846 ast::TyF64 => ("f64".to_string(), DW_ATE_float),
1848 _ => cx.sess().bug("debuginfo::basic_type_metadata - t is invalid type")
1851 let llvm_type = type_of::type_of(cx, t);
1852 let (size, align) = size_and_align_of(cx, llvm_type);
1853 let name = CString::from_slice(name.as_bytes());
1854 let ty_metadata = unsafe {
1855 llvm::LLVMDIBuilderCreateBasicType(
1858 bytes_to_bits(size),
1859 bytes_to_bits(align),
1866 fn pointer_type_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
1867 pointer_type: Ty<'tcx>,
1868 pointee_type_metadata: DIType)
1870 let pointer_llvm_type = type_of::type_of(cx, pointer_type);
1871 let (pointer_size, pointer_align) = size_and_align_of(cx, pointer_llvm_type);
1872 let name = compute_debuginfo_type_name(cx, pointer_type, false);
1873 let name = CString::from_slice(name.as_bytes());
1874 let ptr_metadata = unsafe {
1875 llvm::LLVMDIBuilderCreatePointerType(
1877 pointee_type_metadata,
1878 bytes_to_bits(pointer_size),
1879 bytes_to_bits(pointer_align),
1882 return ptr_metadata;
1885 //=-----------------------------------------------------------------------------
1886 // Common facilities for record-like types (structs, enums, tuples)
1887 //=-----------------------------------------------------------------------------
1890 FixedMemberOffset { bytes: uint },
1891 // For ComputedMemberOffset, the offset is read from the llvm type definition
1892 ComputedMemberOffset
1895 // Description of a type member, which can either be a regular field (as in
1896 // structs or tuples) or an enum variant
1897 struct MemberDescription {
1900 type_metadata: DIType,
1901 offset: MemberOffset,
1905 // A factory for MemberDescriptions. It produces a list of member descriptions
1906 // for some record-like type. MemberDescriptionFactories are used to defer the
1907 // creation of type member descriptions in order to break cycles arising from
1908 // recursive type definitions.
1909 enum MemberDescriptionFactory<'tcx> {
1910 StructMDF(StructMemberDescriptionFactory<'tcx>),
1911 TupleMDF(TupleMemberDescriptionFactory<'tcx>),
1912 EnumMDF(EnumMemberDescriptionFactory<'tcx>),
1913 VariantMDF(VariantMemberDescriptionFactory<'tcx>)
1916 impl<'tcx> MemberDescriptionFactory<'tcx> {
1917 fn create_member_descriptions<'a>(&self, cx: &CrateContext<'a, 'tcx>)
1918 -> Vec<MemberDescription> {
1920 StructMDF(ref this) => {
1921 this.create_member_descriptions(cx)
1923 TupleMDF(ref this) => {
1924 this.create_member_descriptions(cx)
1926 EnumMDF(ref this) => {
1927 this.create_member_descriptions(cx)
1929 VariantMDF(ref this) => {
1930 this.create_member_descriptions(cx)
1936 // A description of some recursive type. It can either be already finished (as
1937 // with FinalMetadata) or it is not yet finished, but contains all information
1938 // needed to generate the missing parts of the description. See the documentation
1939 // section on Recursive Types at the top of this file for more information.
1940 enum RecursiveTypeDescription<'tcx> {
1941 UnfinishedMetadata {
1942 unfinished_type: Ty<'tcx>,
1943 unique_type_id: UniqueTypeId,
1944 metadata_stub: DICompositeType,
1946 member_description_factory: MemberDescriptionFactory<'tcx>,
1948 FinalMetadata(DICompositeType)
1951 fn create_and_register_recursive_type_forward_declaration<'a, 'tcx>(
1952 cx: &CrateContext<'a, 'tcx>,
1953 unfinished_type: Ty<'tcx>,
1954 unique_type_id: UniqueTypeId,
1955 metadata_stub: DICompositeType,
1957 member_description_factory: MemberDescriptionFactory<'tcx>)
1958 -> RecursiveTypeDescription<'tcx> {
1960 // Insert the stub into the TypeMap in order to allow for recursive references
1961 let mut type_map = debug_context(cx).type_map.borrow_mut();
1962 type_map.register_unique_id_with_metadata(cx, unique_type_id, metadata_stub);
1963 type_map.register_type_with_metadata(cx, unfinished_type, metadata_stub);
1965 UnfinishedMetadata {
1966 unfinished_type: unfinished_type,
1967 unique_type_id: unique_type_id,
1968 metadata_stub: metadata_stub,
1969 llvm_type: llvm_type,
1970 member_description_factory: member_description_factory,
1974 impl<'tcx> RecursiveTypeDescription<'tcx> {
1975 // Finishes up the description of the type in question (mostly by providing
1976 // descriptions of the fields of the given type) and returns the final type metadata.
1977 fn finalize<'a>(&self, cx: &CrateContext<'a, 'tcx>) -> MetadataCreationResult {
1979 FinalMetadata(metadata) => MetadataCreationResult::new(metadata, false),
1980 UnfinishedMetadata {
1985 ref member_description_factory,
1988 // Make sure that we have a forward declaration of the type in
1989 // the TypeMap so that recursive references are possible. This
1990 // will always be the case if the RecursiveTypeDescription has
1991 // been properly created through the
1992 // create_and_register_recursive_type_forward_declaration() function.
1994 let type_map = debug_context(cx).type_map.borrow();
1995 if type_map.find_metadata_for_unique_id(unique_type_id).is_none() ||
1996 type_map.find_metadata_for_type(unfinished_type).is_none() {
1997 cx.sess().bug(&format!("Forward declaration of potentially recursive type \
1998 '{}' was not found in TypeMap!",
1999 ppaux::ty_to_string(cx.tcx(), unfinished_type))
2004 // ... then create the member descriptions ...
2005 let member_descriptions =
2006 member_description_factory.create_member_descriptions(cx);
2008 // ... and attach them to the stub to complete it.
2009 set_members_of_composite_type(cx,
2012 &member_descriptions[]);
2013 return MetadataCreationResult::new(metadata_stub, true);
2020 //=-----------------------------------------------------------------------------
2022 //=-----------------------------------------------------------------------------
2024 // Creates MemberDescriptions for the fields of a struct
2025 struct StructMemberDescriptionFactory<'tcx> {
2026 fields: Vec<ty::field<'tcx>>,
2031 impl<'tcx> StructMemberDescriptionFactory<'tcx> {
2032 fn create_member_descriptions<'a>(&self, cx: &CrateContext<'a, 'tcx>)
2033 -> Vec<MemberDescription> {
2034 if self.fields.len() == 0 {
2038 let field_size = if self.is_simd {
2039 machine::llsize_of_alloc(cx, type_of::type_of(cx, self.fields[0].mt.ty)) as uint
2044 self.fields.iter().enumerate().map(|(i, field)| {
2045 let name = if field.name == special_idents::unnamed_field.name {
2048 token::get_name(field.name).get().to_string()
2051 let offset = if self.is_simd {
2052 assert!(field_size != 0xdeadbeef);
2053 FixedMemberOffset { bytes: i * field_size }
2055 ComputedMemberOffset
2060 llvm_type: type_of::type_of(cx, field.mt.ty),
2061 type_metadata: type_metadata(cx, field.mt.ty, self.span),
2070 fn prepare_struct_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2071 struct_type: Ty<'tcx>,
2073 substs: &subst::Substs<'tcx>,
2074 unique_type_id: UniqueTypeId,
2076 -> RecursiveTypeDescription<'tcx> {
2077 let struct_name = compute_debuginfo_type_name(cx, struct_type, false);
2078 let struct_llvm_type = type_of::type_of(cx, struct_type);
2080 let (containing_scope, _) = get_namespace_and_span_for_item(cx, def_id);
2082 let struct_metadata_stub = create_struct_stub(cx,
2088 let fields = ty::struct_fields(cx.tcx(), def_id, substs);
2090 create_and_register_recursive_type_forward_declaration(
2094 struct_metadata_stub,
2096 StructMDF(StructMemberDescriptionFactory {
2098 is_simd: ty::type_is_simd(cx.tcx(), struct_type),
2105 //=-----------------------------------------------------------------------------
2107 //=-----------------------------------------------------------------------------
2109 // Creates MemberDescriptions for the fields of a tuple
2110 struct TupleMemberDescriptionFactory<'tcx> {
2111 component_types: Vec<Ty<'tcx>>,
2115 impl<'tcx> TupleMemberDescriptionFactory<'tcx> {
2116 fn create_member_descriptions<'a>(&self, cx: &CrateContext<'a, 'tcx>)
2117 -> Vec<MemberDescription> {
2118 self.component_types.iter().map(|&component_type| {
2120 name: "".to_string(),
2121 llvm_type: type_of::type_of(cx, component_type),
2122 type_metadata: type_metadata(cx, component_type, self.span),
2123 offset: ComputedMemberOffset,
2130 fn prepare_tuple_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2131 tuple_type: Ty<'tcx>,
2132 component_types: &[Ty<'tcx>],
2133 unique_type_id: UniqueTypeId,
2135 -> RecursiveTypeDescription<'tcx> {
2136 let tuple_name = compute_debuginfo_type_name(cx, tuple_type, false);
2137 let tuple_llvm_type = type_of::type_of(cx, tuple_type);
2139 create_and_register_recursive_type_forward_declaration(
2143 create_struct_stub(cx,
2147 UNKNOWN_SCOPE_METADATA),
2149 TupleMDF(TupleMemberDescriptionFactory {
2150 component_types: component_types.to_vec(),
2157 //=-----------------------------------------------------------------------------
2159 //=-----------------------------------------------------------------------------
2161 // Describes the members of an enum value: An enum is described as a union of
2162 // structs in DWARF. This MemberDescriptionFactory provides the description for
2163 // the members of this union; so for every variant of the given enum, this factory
2164 // will produce one MemberDescription (all with no name and a fixed offset of
2166 struct EnumMemberDescriptionFactory<'tcx> {
2167 enum_type: Ty<'tcx>,
2168 type_rep: Rc<adt::Repr<'tcx>>,
2169 variants: Rc<Vec<Rc<ty::VariantInfo<'tcx>>>>,
2170 discriminant_type_metadata: Option<DIType>,
2171 containing_scope: DIScope,
2172 file_metadata: DIFile,
2176 impl<'tcx> EnumMemberDescriptionFactory<'tcx> {
2177 fn create_member_descriptions<'a>(&self, cx: &CrateContext<'a, 'tcx>)
2178 -> Vec<MemberDescription> {
2179 match *self.type_rep {
2180 adt::General(_, ref struct_defs, _) => {
2181 let discriminant_info = RegularDiscriminant(self.discriminant_type_metadata
2187 .map(|(i, struct_def)| {
2188 let (variant_type_metadata,
2190 member_desc_factory) =
2191 describe_enum_variant(cx,
2194 &*(*self.variants)[i],
2196 self.containing_scope,
2199 let member_descriptions = member_desc_factory
2200 .create_member_descriptions(cx);
2202 set_members_of_composite_type(cx,
2203 variant_type_metadata,
2205 &member_descriptions[]);
2207 name: "".to_string(),
2208 llvm_type: variant_llvm_type,
2209 type_metadata: variant_type_metadata,
2210 offset: FixedMemberOffset { bytes: 0 },
2215 adt::Univariant(ref struct_def, _) => {
2216 assert!(self.variants.len() <= 1);
2218 if self.variants.len() == 0 {
2221 let (variant_type_metadata,
2223 member_description_factory) =
2224 describe_enum_variant(cx,
2227 &*(*self.variants)[0],
2229 self.containing_scope,
2232 let member_descriptions =
2233 member_description_factory.create_member_descriptions(cx);
2235 set_members_of_composite_type(cx,
2236 variant_type_metadata,
2238 &member_descriptions[]);
2241 name: "".to_string(),
2242 llvm_type: variant_llvm_type,
2243 type_metadata: variant_type_metadata,
2244 offset: FixedMemberOffset { bytes: 0 },
2250 adt::RawNullablePointer { nndiscr: non_null_variant_index, nnty, .. } => {
2251 // As far as debuginfo is concerned, the pointer this enum
2252 // represents is still wrapped in a struct. This is to make the
2253 // DWARF representation of enums uniform.
2255 // First create a description of the artificial wrapper struct:
2256 let non_null_variant = &(*self.variants)[non_null_variant_index as uint];
2257 let non_null_variant_name = token::get_name(non_null_variant.name);
2259 // The llvm type and metadata of the pointer
2260 let non_null_llvm_type = type_of::type_of(cx, nnty);
2261 let non_null_type_metadata = type_metadata(cx, nnty, self.span);
2263 // The type of the artificial struct wrapping the pointer
2264 let artificial_struct_llvm_type = Type::struct_(cx,
2265 &[non_null_llvm_type],
2268 // For the metadata of the wrapper struct, we need to create a
2269 // MemberDescription of the struct's single field.
2270 let sole_struct_member_description = MemberDescription {
2271 name: match non_null_variant.arg_names {
2272 Some(ref names) => token::get_ident(names[0]).get().to_string(),
2273 None => "".to_string()
2275 llvm_type: non_null_llvm_type,
2276 type_metadata: non_null_type_metadata,
2277 offset: FixedMemberOffset { bytes: 0 },
2281 let unique_type_id = debug_context(cx).type_map
2283 .get_unique_type_id_of_enum_variant(
2286 non_null_variant_name.get());
2288 // Now we can create the metadata of the artificial struct
2289 let artificial_struct_metadata =
2290 composite_type_metadata(cx,
2291 artificial_struct_llvm_type,
2292 non_null_variant_name.get(),
2294 &[sole_struct_member_description],
2295 self.containing_scope,
2299 // Encode the information about the null variant in the union
2301 let null_variant_index = (1 - non_null_variant_index) as uint;
2302 let null_variant_name = token::get_name((*self.variants)[null_variant_index].name);
2303 let union_member_name = format!("RUST$ENCODED$ENUM${}${}",
2307 // Finally create the (singleton) list of descriptions of union
2311 name: union_member_name,
2312 llvm_type: artificial_struct_llvm_type,
2313 type_metadata: artificial_struct_metadata,
2314 offset: FixedMemberOffset { bytes: 0 },
2319 adt::StructWrappedNullablePointer { nonnull: ref struct_def,
2321 ref discrfield, ..} => {
2322 // Create a description of the non-null variant
2323 let (variant_type_metadata, variant_llvm_type, member_description_factory) =
2324 describe_enum_variant(cx,
2327 &*(*self.variants)[nndiscr as uint],
2328 OptimizedDiscriminant,
2329 self.containing_scope,
2332 let variant_member_descriptions =
2333 member_description_factory.create_member_descriptions(cx);
2335 set_members_of_composite_type(cx,
2336 variant_type_metadata,
2338 &variant_member_descriptions[]);
2340 // Encode the information about the null variant in the union
2342 let null_variant_index = (1 - nndiscr) as uint;
2343 let null_variant_name = token::get_name((*self.variants)[null_variant_index].name);
2344 let discrfield = discrfield.iter()
2346 .map(|x| x.to_string())
2347 .collect::<Vec<_>>().connect("$");
2348 let union_member_name = format!("RUST$ENCODED$ENUM${}${}",
2352 // Create the (singleton) list of descriptions of union members.
2355 name: union_member_name,
2356 llvm_type: variant_llvm_type,
2357 type_metadata: variant_type_metadata,
2358 offset: FixedMemberOffset { bytes: 0 },
2363 adt::CEnum(..) => cx.sess().span_bug(self.span, "This should be unreachable.")
2368 // Creates MemberDescriptions for the fields of a single enum variant.
2369 struct VariantMemberDescriptionFactory<'tcx> {
2370 args: Vec<(String, Ty<'tcx>)>,
2371 discriminant_type_metadata: Option<DIType>,
2375 impl<'tcx> VariantMemberDescriptionFactory<'tcx> {
2376 fn create_member_descriptions<'a>(&self, cx: &CrateContext<'a, 'tcx>)
2377 -> Vec<MemberDescription> {
2378 self.args.iter().enumerate().map(|(i, &(ref name, ty))| {
2380 name: name.to_string(),
2381 llvm_type: type_of::type_of(cx, ty),
2382 type_metadata: match self.discriminant_type_metadata {
2383 Some(metadata) if i == 0 => metadata,
2384 _ => type_metadata(cx, ty, self.span)
2386 offset: ComputedMemberOffset,
2394 enum EnumDiscriminantInfo {
2395 RegularDiscriminant(DIType),
2396 OptimizedDiscriminant,
2400 // Returns a tuple of (1) type_metadata_stub of the variant, (2) the llvm_type
2401 // of the variant, and (3) a MemberDescriptionFactory for producing the
2402 // descriptions of the fields of the variant. This is a rudimentary version of a
2403 // full RecursiveTypeDescription.
2404 fn describe_enum_variant<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2405 enum_type: Ty<'tcx>,
2406 struct_def: &adt::Struct<'tcx>,
2407 variant_info: &ty::VariantInfo<'tcx>,
2408 discriminant_info: EnumDiscriminantInfo,
2409 containing_scope: DIScope,
2411 -> (DICompositeType, Type, MemberDescriptionFactory<'tcx>) {
2412 let variant_llvm_type =
2413 Type::struct_(cx, &struct_def.fields
2415 .map(|&t| type_of::type_of(cx, t))
2416 .collect::<Vec<_>>()
2419 // Could do some consistency checks here: size, align, field count, discr type
2421 let variant_name = token::get_name(variant_info.name);
2422 let variant_name = variant_name.get();
2423 let unique_type_id = debug_context(cx).type_map
2425 .get_unique_type_id_of_enum_variant(
2430 let metadata_stub = create_struct_stub(cx,
2436 // Get the argument names from the enum variant info
2437 let mut arg_names: Vec<_> = match variant_info.arg_names {
2438 Some(ref names) => {
2441 token::get_ident(*ident).get().to_string()
2444 None => variant_info.args.iter().map(|_| "".to_string()).collect()
2447 // If this is not a univariant enum, there is also the discriminant field.
2448 match discriminant_info {
2449 RegularDiscriminant(_) => arg_names.insert(0, "RUST$ENUM$DISR".to_string()),
2450 _ => { /* do nothing */ }
2453 // Build an array of (field name, field type) pairs to be captured in the factory closure.
2454 let args: Vec<(String, Ty)> = arg_names.iter()
2455 .zip(struct_def.fields.iter())
2456 .map(|(s, &t)| (s.to_string(), t))
2459 let member_description_factory =
2460 VariantMDF(VariantMemberDescriptionFactory {
2462 discriminant_type_metadata: match discriminant_info {
2463 RegularDiscriminant(discriminant_type_metadata) => {
2464 Some(discriminant_type_metadata)
2471 (metadata_stub, variant_llvm_type, member_description_factory)
2474 fn prepare_enum_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2475 enum_type: Ty<'tcx>,
2476 enum_def_id: ast::DefId,
2477 unique_type_id: UniqueTypeId,
2479 -> RecursiveTypeDescription<'tcx> {
2480 let enum_name = compute_debuginfo_type_name(cx, enum_type, false);
2482 let (containing_scope, definition_span) = get_namespace_and_span_for_item(cx, enum_def_id);
2483 let loc = span_start(cx, definition_span);
2484 let file_metadata = file_metadata(cx, &loc.file.name[]);
2486 let variants = ty::enum_variants(cx.tcx(), enum_def_id);
2488 let enumerators_metadata: Vec<DIDescriptor> = variants
2491 let token = token::get_name(v.name);
2492 let name = CString::from_slice(token.get().as_bytes());
2494 llvm::LLVMDIBuilderCreateEnumerator(
2502 let discriminant_type_metadata = |&: inttype| {
2503 // We can reuse the type of the discriminant for all monomorphized
2504 // instances of an enum because it doesn't depend on any type parameters.
2505 // The def_id, uniquely identifying the enum's polytype acts as key in
2507 let cached_discriminant_type_metadata = debug_context(cx).created_enum_disr_types
2509 .get(&enum_def_id).cloned();
2510 match cached_discriminant_type_metadata {
2511 Some(discriminant_type_metadata) => discriminant_type_metadata,
2513 let discriminant_llvm_type = adt::ll_inttype(cx, inttype);
2514 let (discriminant_size, discriminant_align) =
2515 size_and_align_of(cx, discriminant_llvm_type);
2516 let discriminant_base_type_metadata =
2518 adt::ty_of_inttype(cx.tcx(), inttype),
2520 let discriminant_name = get_enum_discriminant_name(cx, enum_def_id);
2522 let name = CString::from_slice(discriminant_name.get().as_bytes());
2523 let discriminant_type_metadata = unsafe {
2524 llvm::LLVMDIBuilderCreateEnumerationType(
2528 UNKNOWN_FILE_METADATA,
2529 UNKNOWN_LINE_NUMBER,
2530 bytes_to_bits(discriminant_size),
2531 bytes_to_bits(discriminant_align),
2532 create_DIArray(DIB(cx), enumerators_metadata.as_slice()),
2533 discriminant_base_type_metadata)
2536 debug_context(cx).created_enum_disr_types
2538 .insert(enum_def_id, discriminant_type_metadata);
2540 discriminant_type_metadata
2545 let type_rep = adt::represent_type(cx, enum_type);
2547 let discriminant_type_metadata = match *type_rep {
2548 adt::CEnum(inttype, _, _) => {
2549 return FinalMetadata(discriminant_type_metadata(inttype))
2551 adt::RawNullablePointer { .. } |
2552 adt::StructWrappedNullablePointer { .. } |
2553 adt::Univariant(..) => None,
2554 adt::General(inttype, _, _) => Some(discriminant_type_metadata(inttype)),
2557 let enum_llvm_type = type_of::type_of(cx, enum_type);
2558 let (enum_type_size, enum_type_align) = size_and_align_of(cx, enum_llvm_type);
2560 let unique_type_id_str = debug_context(cx)
2563 .get_unique_type_id_as_string(unique_type_id);
2565 let enum_name = CString::from_slice(enum_name.as_bytes());
2566 let unique_type_id_str = CString::from_slice(unique_type_id_str.as_bytes());
2567 let enum_metadata = unsafe {
2568 llvm::LLVMDIBuilderCreateUnionType(
2572 UNKNOWN_FILE_METADATA,
2573 UNKNOWN_LINE_NUMBER,
2574 bytes_to_bits(enum_type_size),
2575 bytes_to_bits(enum_type_align),
2579 unique_type_id_str.as_ptr())
2582 return create_and_register_recursive_type_forward_declaration(
2588 EnumMDF(EnumMemberDescriptionFactory {
2589 enum_type: enum_type,
2590 type_rep: type_rep.clone(),
2592 discriminant_type_metadata: discriminant_type_metadata,
2593 containing_scope: containing_scope,
2594 file_metadata: file_metadata,
2599 fn get_enum_discriminant_name(cx: &CrateContext,
2601 -> token::InternedString {
2602 let name = if def_id.krate == ast::LOCAL_CRATE {
2603 cx.tcx().map.get_path_elem(def_id.node).name()
2605 csearch::get_item_path(cx.tcx(), def_id).last().unwrap().name()
2608 token::get_name(name)
2612 /// Creates debug information for a composite type, that is, anything that
2613 /// results in a LLVM struct.
2615 /// Examples of Rust types to use this are: structs, tuples, boxes, vecs, and enums.
2616 fn composite_type_metadata(cx: &CrateContext,
2617 composite_llvm_type: Type,
2618 composite_type_name: &str,
2619 composite_type_unique_id: UniqueTypeId,
2620 member_descriptions: &[MemberDescription],
2621 containing_scope: DIScope,
2623 // Ignore source location information as long as it
2624 // can't be reconstructed for non-local crates.
2625 _file_metadata: DIFile,
2626 _definition_span: Span)
2627 -> DICompositeType {
2628 // Create the (empty) struct metadata node ...
2629 let composite_type_metadata = create_struct_stub(cx,
2630 composite_llvm_type,
2631 composite_type_name,
2632 composite_type_unique_id,
2634 // ... and immediately create and add the member descriptions.
2635 set_members_of_composite_type(cx,
2636 composite_type_metadata,
2637 composite_llvm_type,
2638 member_descriptions);
2640 return composite_type_metadata;
2643 fn set_members_of_composite_type(cx: &CrateContext,
2644 composite_type_metadata: DICompositeType,
2645 composite_llvm_type: Type,
2646 member_descriptions: &[MemberDescription]) {
2647 // In some rare cases LLVM metadata uniquing would lead to an existing type
2648 // description being used instead of a new one created in create_struct_stub.
2649 // This would cause a hard to trace assertion in DICompositeType::SetTypeArray().
2650 // The following check makes sure that we get a better error message if this
2651 // should happen again due to some regression.
2653 let mut composite_types_completed =
2654 debug_context(cx).composite_types_completed.borrow_mut();
2655 if composite_types_completed.contains(&composite_type_metadata) {
2656 let (llvm_version_major, llvm_version_minor) = unsafe {
2657 (llvm::LLVMVersionMajor(), llvm::LLVMVersionMinor())
2660 let actual_llvm_version = llvm_version_major * 1000000 + llvm_version_minor * 1000;
2661 let min_supported_llvm_version = 3 * 1000000 + 4 * 1000;
2663 if actual_llvm_version < min_supported_llvm_version {
2664 cx.sess().warn(&format!("This version of rustc was built with LLVM \
2665 {}.{}. Rustc just ran into a known \
2666 debuginfo corruption problem thatoften \
2667 occurs with LLVM versions below 3.4. \
2668 Please use a rustc built with anewer \
2671 llvm_version_minor)[]);
2673 cx.sess().bug("debuginfo::set_members_of_composite_type() - \
2674 Already completed forward declaration re-encountered.");
2677 composite_types_completed.insert(composite_type_metadata);
2681 let member_metadata: Vec<DIDescriptor> = member_descriptions
2684 .map(|(i, member_description)| {
2685 let (member_size, member_align) = size_and_align_of(cx, member_description.llvm_type);
2686 let member_offset = match member_description.offset {
2687 FixedMemberOffset { bytes } => bytes as u64,
2688 ComputedMemberOffset => machine::llelement_offset(cx, composite_llvm_type, i)
2691 let member_name = CString::from_slice(member_description.name.as_bytes());
2693 llvm::LLVMDIBuilderCreateMemberType(
2695 composite_type_metadata,
2696 member_name.as_ptr(),
2697 UNKNOWN_FILE_METADATA,
2698 UNKNOWN_LINE_NUMBER,
2699 bytes_to_bits(member_size),
2700 bytes_to_bits(member_align),
2701 bytes_to_bits(member_offset),
2702 member_description.flags,
2703 member_description.type_metadata)
2709 let type_array = create_DIArray(DIB(cx), &member_metadata[]);
2710 llvm::LLVMDICompositeTypeSetTypeArray(composite_type_metadata, type_array);
2714 // A convenience wrapper around LLVMDIBuilderCreateStructType(). Does not do any
2715 // caching, does not add any fields to the struct. This can be done later with
2716 // set_members_of_composite_type().
2717 fn create_struct_stub(cx: &CrateContext,
2718 struct_llvm_type: Type,
2719 struct_type_name: &str,
2720 unique_type_id: UniqueTypeId,
2721 containing_scope: DIScope)
2722 -> DICompositeType {
2723 let (struct_size, struct_align) = size_and_align_of(cx, struct_llvm_type);
2725 let unique_type_id_str = debug_context(cx).type_map
2727 .get_unique_type_id_as_string(unique_type_id);
2728 let name = CString::from_slice(struct_type_name.as_bytes());
2729 let unique_type_id = CString::from_slice(unique_type_id_str.as_bytes());
2730 let metadata_stub = unsafe {
2731 // LLVMDIBuilderCreateStructType() wants an empty array. A null
2732 // pointer will lead to hard to trace and debug LLVM assertions
2733 // later on in llvm/lib/IR/Value.cpp.
2734 let empty_array = create_DIArray(DIB(cx), &[]);
2736 llvm::LLVMDIBuilderCreateStructType(
2740 UNKNOWN_FILE_METADATA,
2741 UNKNOWN_LINE_NUMBER,
2742 bytes_to_bits(struct_size),
2743 bytes_to_bits(struct_align),
2749 unique_type_id.as_ptr())
2752 return metadata_stub;
2755 fn fixed_vec_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2756 unique_type_id: UniqueTypeId,
2757 element_type: Ty<'tcx>,
2760 -> MetadataCreationResult {
2761 let element_type_metadata = type_metadata(cx, element_type, span);
2763 return_if_metadata_created_in_meantime!(cx, unique_type_id);
2765 let element_llvm_type = type_of::type_of(cx, element_type);
2766 let (element_type_size, element_type_align) = size_and_align_of(cx, element_llvm_type);
2768 let subrange = unsafe {
2769 llvm::LLVMDIBuilderGetOrCreateSubrange(
2775 let subscripts = create_DIArray(DIB(cx), &[subrange]);
2776 let metadata = unsafe {
2777 llvm::LLVMDIBuilderCreateArrayType(
2779 bytes_to_bits(element_type_size * (len as u64)),
2780 bytes_to_bits(element_type_align),
2781 element_type_metadata,
2785 return MetadataCreationResult::new(metadata, false);
2788 fn vec_slice_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2790 element_type: Ty<'tcx>,
2791 unique_type_id: UniqueTypeId,
2793 -> MetadataCreationResult {
2794 let data_ptr_type = ty::mk_ptr(cx.tcx(), ty::mt {
2796 mutbl: ast::MutImmutable
2799 let element_type_metadata = type_metadata(cx, data_ptr_type, span);
2801 return_if_metadata_created_in_meantime!(cx, unique_type_id);
2803 let slice_llvm_type = type_of::type_of(cx, vec_type);
2804 let slice_type_name = compute_debuginfo_type_name(cx, vec_type, true);
2806 let member_llvm_types = slice_llvm_type.field_types();
2807 assert!(slice_layout_is_correct(cx,
2808 &member_llvm_types[],
2810 let member_descriptions = [
2812 name: "data_ptr".to_string(),
2813 llvm_type: member_llvm_types[0],
2814 type_metadata: element_type_metadata,
2815 offset: ComputedMemberOffset,
2819 name: "length".to_string(),
2820 llvm_type: member_llvm_types[1],
2821 type_metadata: type_metadata(cx, cx.tcx().types.uint, span),
2822 offset: ComputedMemberOffset,
2827 assert!(member_descriptions.len() == member_llvm_types.len());
2829 let loc = span_start(cx, span);
2830 let file_metadata = file_metadata(cx, &loc.file.name[]);
2832 let metadata = composite_type_metadata(cx,
2836 &member_descriptions,
2837 UNKNOWN_SCOPE_METADATA,
2840 return MetadataCreationResult::new(metadata, false);
2842 fn slice_layout_is_correct<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2843 member_llvm_types: &[Type],
2844 element_type: Ty<'tcx>)
2846 member_llvm_types.len() == 2 &&
2847 member_llvm_types[0] == type_of::type_of(cx, element_type).ptr_to() &&
2848 member_llvm_types[1] == cx.int_type()
2852 fn subroutine_type_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2853 unique_type_id: UniqueTypeId,
2854 signature: &ty::PolyFnSig<'tcx>,
2856 -> MetadataCreationResult
2858 let signature = ty::erase_late_bound_regions(cx.tcx(), signature);
2860 let mut signature_metadata: Vec<DIType> = Vec::with_capacity(signature.inputs.len() + 1);
2863 signature_metadata.push(match signature.output {
2864 ty::FnConverging(ret_ty) => match ret_ty.sty {
2865 ty::ty_tup(ref tys) if tys.is_empty() => ptr::null_mut(),
2866 _ => type_metadata(cx, ret_ty, span)
2868 ty::FnDiverging => diverging_type_metadata(cx)
2871 // regular arguments
2872 for &argument_type in signature.inputs.iter() {
2873 signature_metadata.push(type_metadata(cx, argument_type, span));
2876 return_if_metadata_created_in_meantime!(cx, unique_type_id);
2878 return MetadataCreationResult::new(
2880 llvm::LLVMDIBuilderCreateSubroutineType(
2882 UNKNOWN_FILE_METADATA,
2883 create_DIArray(DIB(cx), &signature_metadata[]))
2888 // FIXME(1563) This is all a bit of a hack because 'trait pointer' is an ill-
2889 // defined concept. For the case of an actual trait pointer (i.e., Box<Trait>,
2890 // &Trait), trait_object_type should be the whole thing (e.g, Box<Trait>) and
2891 // trait_type should be the actual trait (e.g., Trait). Where the trait is part
2892 // of a DST struct, there is no trait_object_type and the results of this
2893 // function will be a little bit weird.
2894 fn trait_pointer_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2895 trait_type: Ty<'tcx>,
2896 trait_object_type: Option<Ty<'tcx>>,
2897 unique_type_id: UniqueTypeId)
2899 // The implementation provided here is a stub. It makes sure that the trait
2900 // type is assigned the correct name, size, namespace, and source location.
2901 // But it does not describe the trait's methods.
2903 let def_id = match trait_type.sty {
2904 ty::ty_trait(ref data) => data.principal_def_id(),
2906 let pp_type_name = ppaux::ty_to_string(cx.tcx(), trait_type);
2907 cx.sess().bug(&format!("debuginfo: Unexpected trait-object type in \
2908 trait_pointer_metadata(): {}",
2909 &pp_type_name[])[]);
2913 let trait_object_type = trait_object_type.unwrap_or(trait_type);
2914 let trait_type_name =
2915 compute_debuginfo_type_name(cx, trait_object_type, false);
2917 let (containing_scope, _) = get_namespace_and_span_for_item(cx, def_id);
2919 let trait_llvm_type = type_of::type_of(cx, trait_object_type);
2921 composite_type_metadata(cx,
2927 UNKNOWN_FILE_METADATA,
2931 fn type_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
2933 usage_site_span: Span)
2935 // Get the unique type id of this type.
2936 let unique_type_id = {
2937 let mut type_map = debug_context(cx).type_map.borrow_mut();
2938 // First, try to find the type in TypeMap. If we have seen it before, we
2939 // can exit early here.
2940 match type_map.find_metadata_for_type(t) {
2945 // The Ty is not in the TypeMap but maybe we have already seen
2946 // an equivalent type (e.g. only differing in region arguments).
2947 // In order to find out, generate the unique type id and look
2949 let unique_type_id = type_map.get_unique_type_id_of_type(cx, t);
2950 match type_map.find_metadata_for_unique_id(unique_type_id) {
2952 // There is already an equivalent type in the TypeMap.
2953 // Register this Ty as an alias in the cache and
2954 // return the cached metadata.
2955 type_map.register_type_with_metadata(cx, t, metadata);
2959 // There really is no type metadata for this type, so
2960 // proceed by creating it.
2968 debug!("type_metadata: {:?}", t);
2971 let MetadataCreationResult { metadata, already_stored_in_typemap } = match *sty {
2976 ty::ty_float(_) => {
2977 MetadataCreationResult::new(basic_type_metadata(cx, t), false)
2979 ty::ty_tup(ref elements) if elements.is_empty() => {
2980 MetadataCreationResult::new(basic_type_metadata(cx, t), false)
2982 ty::ty_enum(def_id, _) => {
2983 prepare_enum_metadata(cx, t, def_id, unique_type_id, usage_site_span).finalize(cx)
2985 ty::ty_vec(typ, Some(len)) => {
2986 fixed_vec_metadata(cx, unique_type_id, typ, len, usage_site_span)
2988 // FIXME Can we do better than this for unsized vec/str fields?
2989 ty::ty_vec(typ, None) => fixed_vec_metadata(cx, unique_type_id, typ, 0, usage_site_span),
2990 ty::ty_str => fixed_vec_metadata(cx, unique_type_id, cx.tcx().types.i8, 0, usage_site_span),
2991 ty::ty_trait(..) => {
2992 MetadataCreationResult::new(
2993 trait_pointer_metadata(cx, t, None, unique_type_id),
2996 ty::ty_uniq(ty) | ty::ty_ptr(ty::mt{ty, ..}) | ty::ty_rptr(_, ty::mt{ty, ..}) => {
2998 ty::ty_vec(typ, None) => {
2999 vec_slice_metadata(cx, t, typ, unique_type_id, usage_site_span)
3002 vec_slice_metadata(cx, t, cx.tcx().types.u8, unique_type_id, usage_site_span)
3004 ty::ty_trait(..) => {
3005 MetadataCreationResult::new(
3006 trait_pointer_metadata(cx, ty, Some(t), unique_type_id),
3010 let pointee_metadata = type_metadata(cx, ty, usage_site_span);
3012 match debug_context(cx).type_map
3014 .find_metadata_for_unique_id(unique_type_id) {
3015 Some(metadata) => return metadata,
3016 None => { /* proceed normally */ }
3019 MetadataCreationResult::new(pointer_type_metadata(cx, t, pointee_metadata),
3024 ty::ty_bare_fn(_, ref barefnty) => {
3025 subroutine_type_metadata(cx, unique_type_id, &barefnty.sig, usage_site_span)
3027 ty::ty_unboxed_closure(def_id, _, substs) => {
3028 let typer = NormalizingUnboxedClosureTyper::new(cx.tcx());
3029 let sig = typer.unboxed_closure_type(def_id, substs).sig;
3030 subroutine_type_metadata(cx, unique_type_id, &sig, usage_site_span)
3032 ty::ty_struct(def_id, substs) => {
3033 prepare_struct_metadata(cx,
3038 usage_site_span).finalize(cx)
3040 ty::ty_tup(ref elements) => {
3041 prepare_tuple_metadata(cx,
3045 usage_site_span).finalize(cx)
3048 cx.sess().bug(&format!("debuginfo: unexpected type in type_metadata: {:?}",
3054 let mut type_map = debug_context(cx).type_map.borrow_mut();
3056 if already_stored_in_typemap {
3057 // Also make sure that we already have a TypeMap entry entry for the unique type id.
3058 let metadata_for_uid = match type_map.find_metadata_for_unique_id(unique_type_id) {
3059 Some(metadata) => metadata,
3061 let unique_type_id_str =
3062 type_map.get_unique_type_id_as_string(unique_type_id);
3063 let error_message = format!("Expected type metadata for unique \
3064 type id '{}' to already be in \
3065 the debuginfo::TypeMap but it \
3066 was not. (Ty = {})",
3067 &unique_type_id_str[],
3068 ppaux::ty_to_string(cx.tcx(), t));
3069 cx.sess().span_bug(usage_site_span, &error_message[]);
3073 match type_map.find_metadata_for_type(t) {
3075 if metadata != metadata_for_uid {
3076 let unique_type_id_str =
3077 type_map.get_unique_type_id_as_string(unique_type_id);
3078 let error_message = format!("Mismatch between Ty and \
3079 UniqueTypeId maps in \
3080 debuginfo::TypeMap. \
3081 UniqueTypeId={}, Ty={}",
3082 &unique_type_id_str[],
3083 ppaux::ty_to_string(cx.tcx(), t));
3084 cx.sess().span_bug(usage_site_span, &error_message[]);
3088 type_map.register_type_with_metadata(cx, t, metadata);
3092 type_map.register_type_with_metadata(cx, t, metadata);
3093 type_map.register_unique_id_with_metadata(cx, unique_type_id, metadata);
3100 struct MetadataCreationResult {
3102 already_stored_in_typemap: bool
3105 impl MetadataCreationResult {
3106 fn new(metadata: DIType, already_stored_in_typemap: bool) -> MetadataCreationResult {
3107 MetadataCreationResult {
3109 already_stored_in_typemap: already_stored_in_typemap
3114 #[derive(Copy, PartialEq)]
3115 enum DebugLocation {
3116 KnownLocation { scope: DIScope, line: uint, col: uint },
3120 impl DebugLocation {
3121 fn new(scope: DIScope, line: uint, col: uint) -> DebugLocation {
3130 fn set_debug_location(cx: &CrateContext, debug_location: DebugLocation) {
3131 if debug_location == debug_context(cx).current_debug_location.get() {
3137 match debug_location {
3138 KnownLocation { scope, line, .. } => {
3139 // Always set the column to zero like Clang and GCC
3140 let col = UNKNOWN_COLUMN_NUMBER;
3141 debug!("setting debug location to {} {}", line, col);
3142 let elements = [C_i32(cx, line as i32), C_i32(cx, col as i32),
3143 scope, ptr::null_mut()];
3145 metadata_node = llvm::LLVMMDNodeInContext(debug_context(cx).llcontext,
3147 elements.len() as c_uint);
3150 UnknownLocation => {
3151 debug!("clearing debug location ");
3152 metadata_node = ptr::null_mut();
3157 llvm::LLVMSetCurrentDebugLocation(cx.raw_builder(), metadata_node);
3160 debug_context(cx).current_debug_location.set(debug_location);
3163 //=-----------------------------------------------------------------------------
3164 // Utility Functions
3165 //=-----------------------------------------------------------------------------
3167 fn contains_nodebug_attribute(attributes: &[ast::Attribute]) -> bool {
3168 attributes.iter().any(|attr| {
3169 let meta_item: &ast::MetaItem = &*attr.node.value;
3170 match meta_item.node {
3171 ast::MetaWord(ref value) => value.get() == "no_debug",
3177 /// Return codemap::Loc corresponding to the beginning of the span
3178 fn span_start(cx: &CrateContext, span: Span) -> codemap::Loc {
3179 cx.sess().codemap().lookup_char_pos(span.lo)
3182 fn size_and_align_of(cx: &CrateContext, llvm_type: Type) -> (u64, u64) {
3183 (machine::llsize_of_alloc(cx, llvm_type), machine::llalign_of_min(cx, llvm_type) as u64)
3186 fn bytes_to_bits(bytes: u64) -> u64 {
3191 fn debug_context<'a, 'tcx>(cx: &'a CrateContext<'a, 'tcx>)
3192 -> &'a CrateDebugContext<'tcx> {
3193 let debug_context: &'a CrateDebugContext<'tcx> = cx.dbg_cx().as_ref().unwrap();
3198 #[allow(non_snake_case)]
3199 fn DIB(cx: &CrateContext) -> DIBuilderRef {
3200 cx.dbg_cx().as_ref().unwrap().builder
3203 fn fn_should_be_ignored(fcx: &FunctionContext) -> bool {
3204 match fcx.debug_context {
3205 FunctionDebugContext::RegularContext(_) => false,
3210 fn assert_type_for_node_id(cx: &CrateContext,
3211 node_id: ast::NodeId,
3212 error_reporting_span: Span) {
3213 if !cx.tcx().node_types.borrow().contains_key(&node_id) {
3214 cx.sess().span_bug(error_reporting_span,
3215 "debuginfo: Could not find type for node id!");
3219 fn get_namespace_and_span_for_item(cx: &CrateContext, def_id: ast::DefId)
3220 -> (DIScope, Span) {
3221 let containing_scope = namespace_for_item(cx, def_id).scope;
3222 let definition_span = if def_id.krate == ast::LOCAL_CRATE {
3223 cx.tcx().map.span(def_id.node)
3225 // For external items there is no span information
3229 (containing_scope, definition_span)
3232 // This procedure builds the *scope map* for a given function, which maps any
3233 // given ast::NodeId in the function's AST to the correct DIScope metadata instance.
3235 // This builder procedure walks the AST in execution order and keeps track of
3236 // what belongs to which scope, creating DIScope DIEs along the way, and
3237 // introducing *artificial* lexical scope descriptors where necessary. These
3238 // artificial scopes allow GDB to correctly handle name shadowing.
3239 fn create_scope_map(cx: &CrateContext,
3241 fn_entry_block: &ast::Block,
3242 fn_metadata: DISubprogram,
3243 fn_ast_id: ast::NodeId)
3244 -> NodeMap<DIScope> {
3245 let mut scope_map = NodeMap::new();
3247 let def_map = &cx.tcx().def_map;
3249 struct ScopeStackEntry {
3250 scope_metadata: DIScope,
3251 ident: Option<ast::Ident>
3254 let mut scope_stack = vec!(ScopeStackEntry { scope_metadata: fn_metadata,
3256 scope_map.insert(fn_ast_id, fn_metadata);
3258 // Push argument identifiers onto the stack so arguments integrate nicely
3259 // with variable shadowing.
3260 for arg in args.iter() {
3261 pat_util::pat_bindings(def_map, &*arg.pat, |_, node_id, _, path1| {
3262 scope_stack.push(ScopeStackEntry { scope_metadata: fn_metadata,
3263 ident: Some(path1.node) });
3264 scope_map.insert(node_id, fn_metadata);
3268 // Clang creates a separate scope for function bodies, so let's do this too.
3270 fn_entry_block.span,
3273 |cx, scope_stack, scope_map| {
3274 walk_block(cx, fn_entry_block, scope_stack, scope_map);
3280 // local helper functions for walking the AST.
3281 fn with_new_scope<F>(cx: &CrateContext,
3283 scope_stack: &mut Vec<ScopeStackEntry> ,
3284 scope_map: &mut NodeMap<DIScope>,
3285 inner_walk: F) where
3286 F: FnOnce(&CrateContext, &mut Vec<ScopeStackEntry>, &mut NodeMap<DIScope>),
3288 // Create a new lexical scope and push it onto the stack
3289 let loc = cx.sess().codemap().lookup_char_pos(scope_span.lo);
3290 let file_metadata = file_metadata(cx, &loc.file.name[]);
3291 let parent_scope = scope_stack.last().unwrap().scope_metadata;
3293 let scope_metadata = unsafe {
3294 llvm::LLVMDIBuilderCreateLexicalBlock(
3299 loc.col.to_uint() as c_uint)
3302 scope_stack.push(ScopeStackEntry { scope_metadata: scope_metadata,
3305 inner_walk(cx, scope_stack, scope_map);
3307 // pop artificial scopes
3308 while scope_stack.last().unwrap().ident.is_some() {
3312 if scope_stack.last().unwrap().scope_metadata != scope_metadata {
3313 cx.sess().span_bug(scope_span, "debuginfo: Inconsistency in scope management.");
3319 fn walk_block(cx: &CrateContext,
3321 scope_stack: &mut Vec<ScopeStackEntry> ,
3322 scope_map: &mut NodeMap<DIScope>) {
3323 scope_map.insert(block.id, scope_stack.last().unwrap().scope_metadata);
3325 // The interesting things here are statements and the concluding expression.
3326 for statement in block.stmts.iter() {
3327 scope_map.insert(ast_util::stmt_id(&**statement),
3328 scope_stack.last().unwrap().scope_metadata);
3330 match statement.node {
3331 ast::StmtDecl(ref decl, _) =>
3332 walk_decl(cx, &**decl, scope_stack, scope_map),
3333 ast::StmtExpr(ref exp, _) |
3334 ast::StmtSemi(ref exp, _) =>
3335 walk_expr(cx, &**exp, scope_stack, scope_map),
3336 ast::StmtMac(..) => () // Ignore macros (which should be expanded anyway).
3340 for exp in block.expr.iter() {
3341 walk_expr(cx, &**exp, scope_stack, scope_map);
3345 fn walk_decl(cx: &CrateContext,
3347 scope_stack: &mut Vec<ScopeStackEntry> ,
3348 scope_map: &mut NodeMap<DIScope>) {
3350 codemap::Spanned { node: ast::DeclLocal(ref local), .. } => {
3351 scope_map.insert(local.id, scope_stack.last().unwrap().scope_metadata);
3353 walk_pattern(cx, &*local.pat, scope_stack, scope_map);
3355 for exp in local.init.iter() {
3356 walk_expr(cx, &**exp, scope_stack, scope_map);
3363 fn walk_pattern(cx: &CrateContext,
3365 scope_stack: &mut Vec<ScopeStackEntry> ,
3366 scope_map: &mut NodeMap<DIScope>) {
3368 let def_map = &cx.tcx().def_map;
3370 // Unfortunately, we cannot just use pat_util::pat_bindings() or
3371 // ast_util::walk_pat() here because we have to visit *all* nodes in
3372 // order to put them into the scope map. The above functions don't do that.
3374 ast::PatIdent(_, ref path1, ref sub_pat_opt) => {
3376 // Check if this is a binding. If so we need to put it on the
3377 // scope stack and maybe introduce an artificial scope
3378 if pat_util::pat_is_binding(def_map, &*pat) {
3380 let ident = path1.node;
3382 // LLVM does not properly generate 'DW_AT_start_scope' fields
3383 // for variable DIEs. For this reason we have to introduce
3384 // an artificial scope at bindings whenever a variable with
3385 // the same name is declared in *any* parent scope.
3387 // Otherwise the following error occurs:
3391 // do_something(); // 'gdb print x' correctly prints 10
3394 // do_something(); // 'gdb print x' prints 0, because it
3395 // // already reads the uninitialized 'x'
3396 // // from the next line...
3398 // do_something(); // 'gdb print x' correctly prints 100
3401 // Is there already a binding with that name?
3402 // N.B.: this comparison must be UNhygienic... because
3403 // gdb knows nothing about the context, so any two
3404 // variables with the same name will cause the problem.
3405 let need_new_scope = scope_stack
3407 .any(|entry| entry.ident.iter().any(|i| i.name == ident.name));
3410 // Create a new lexical scope and push it onto the stack
3411 let loc = cx.sess().codemap().lookup_char_pos(pat.span.lo);
3412 let file_metadata = file_metadata(cx, &loc.file.name[]);
3413 let parent_scope = scope_stack.last().unwrap().scope_metadata;
3415 let scope_metadata = unsafe {
3416 llvm::LLVMDIBuilderCreateLexicalBlock(
3421 loc.col.to_uint() as c_uint)
3424 scope_stack.push(ScopeStackEntry {
3425 scope_metadata: scope_metadata,
3430 // Push a new entry anyway so the name can be found
3431 let prev_metadata = scope_stack.last().unwrap().scope_metadata;
3432 scope_stack.push(ScopeStackEntry {
3433 scope_metadata: prev_metadata,
3439 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3441 for sub_pat in sub_pat_opt.iter() {
3442 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3446 ast::PatWild(_) => {
3447 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3450 ast::PatEnum(_, ref sub_pats_opt) => {
3451 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3453 for sub_pats in sub_pats_opt.iter() {
3454 for p in sub_pats.iter() {
3455 walk_pattern(cx, &**p, scope_stack, scope_map);
3460 ast::PatStruct(_, ref field_pats, _) => {
3461 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3463 for &codemap::Spanned {
3464 node: ast::FieldPat { pat: ref sub_pat, .. },
3466 } in field_pats.iter() {
3467 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3471 ast::PatTup(ref sub_pats) => {
3472 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3474 for sub_pat in sub_pats.iter() {
3475 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3479 ast::PatBox(ref sub_pat) | ast::PatRegion(ref sub_pat, _) => {
3480 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3481 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3484 ast::PatLit(ref exp) => {
3485 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3486 walk_expr(cx, &**exp, scope_stack, scope_map);
3489 ast::PatRange(ref exp1, ref exp2) => {
3490 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3491 walk_expr(cx, &**exp1, scope_stack, scope_map);
3492 walk_expr(cx, &**exp2, scope_stack, scope_map);
3495 ast::PatVec(ref front_sub_pats, ref middle_sub_pats, ref back_sub_pats) => {
3496 scope_map.insert(pat.id, scope_stack.last().unwrap().scope_metadata);
3498 for sub_pat in front_sub_pats.iter() {
3499 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3502 for sub_pat in middle_sub_pats.iter() {
3503 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3506 for sub_pat in back_sub_pats.iter() {
3507 walk_pattern(cx, &**sub_pat, scope_stack, scope_map);
3512 cx.sess().span_bug(pat.span, "debuginfo::create_scope_map() - \
3513 Found unexpanded macro.");
3518 fn walk_expr(cx: &CrateContext,
3520 scope_stack: &mut Vec<ScopeStackEntry> ,
3521 scope_map: &mut NodeMap<DIScope>) {
3523 scope_map.insert(exp.id, scope_stack.last().unwrap().scope_metadata);
3530 ast::ExprQPath(_) => {}
3532 ast::ExprCast(ref sub_exp, _) |
3533 ast::ExprAddrOf(_, ref sub_exp) |
3534 ast::ExprField(ref sub_exp, _) |
3535 ast::ExprTupField(ref sub_exp, _) |
3536 ast::ExprParen(ref sub_exp) =>
3537 walk_expr(cx, &**sub_exp, scope_stack, scope_map),
3539 ast::ExprBox(ref place, ref sub_expr) => {
3541 |e| walk_expr(cx, &**e, scope_stack, scope_map));
3542 walk_expr(cx, &**sub_expr, scope_stack, scope_map);
3545 ast::ExprRet(ref exp_opt) => match *exp_opt {
3546 Some(ref sub_exp) => walk_expr(cx, &**sub_exp, scope_stack, scope_map),
3550 ast::ExprUnary(_, ref sub_exp) => {
3551 walk_expr(cx, &**sub_exp, scope_stack, scope_map);
3554 ast::ExprAssignOp(_, ref lhs, ref rhs) |
3555 ast::ExprIndex(ref lhs, ref rhs) |
3556 ast::ExprBinary(_, ref lhs, ref rhs) => {
3557 walk_expr(cx, &**lhs, scope_stack, scope_map);
3558 walk_expr(cx, &**rhs, scope_stack, scope_map);
3561 ast::ExprRange(ref start, ref end) => {
3562 start.as_ref().map(|e| walk_expr(cx, &**e, scope_stack, scope_map));
3563 end.as_ref().map(|e| walk_expr(cx, &**e, scope_stack, scope_map));
3566 ast::ExprVec(ref init_expressions) |
3567 ast::ExprTup(ref init_expressions) => {
3568 for ie in init_expressions.iter() {
3569 walk_expr(cx, &**ie, scope_stack, scope_map);
3573 ast::ExprAssign(ref sub_exp1, ref sub_exp2) |
3574 ast::ExprRepeat(ref sub_exp1, ref sub_exp2) => {
3575 walk_expr(cx, &**sub_exp1, scope_stack, scope_map);
3576 walk_expr(cx, &**sub_exp2, scope_stack, scope_map);
3579 ast::ExprIf(ref cond_exp, ref then_block, ref opt_else_exp) => {
3580 walk_expr(cx, &**cond_exp, scope_stack, scope_map);
3586 |cx, scope_stack, scope_map| {
3587 walk_block(cx, &**then_block, scope_stack, scope_map);
3590 match *opt_else_exp {
3591 Some(ref else_exp) =>
3592 walk_expr(cx, &**else_exp, scope_stack, scope_map),
3597 ast::ExprIfLet(..) => {
3598 cx.sess().span_bug(exp.span, "debuginfo::create_scope_map() - \
3599 Found unexpanded if-let.");
3602 ast::ExprWhile(ref cond_exp, ref loop_body, _) => {
3603 walk_expr(cx, &**cond_exp, scope_stack, scope_map);
3609 |cx, scope_stack, scope_map| {
3610 walk_block(cx, &**loop_body, scope_stack, scope_map);
3614 ast::ExprWhileLet(..) => {
3615 cx.sess().span_bug(exp.span, "debuginfo::create_scope_map() - \
3616 Found unexpanded while-let.");
3619 ast::ExprForLoop(ref pattern, ref head, ref body, _) => {
3620 walk_expr(cx, &**head, scope_stack, scope_map);
3626 |cx, scope_stack, scope_map| {
3627 scope_map.insert(exp.id,
3635 walk_block(cx, &**body, scope_stack, scope_map);
3639 ast::ExprMac(_) => {
3640 cx.sess().span_bug(exp.span, "debuginfo::create_scope_map() - \
3641 Found unexpanded macro.");
3644 ast::ExprLoop(ref block, _) |
3645 ast::ExprBlock(ref block) => {
3650 |cx, scope_stack, scope_map| {
3651 walk_block(cx, &**block, scope_stack, scope_map);
3655 ast::ExprClosure(_, _, ref decl, ref block) => {
3660 |cx, scope_stack, scope_map| {
3661 for &ast::Arg { pat: ref pattern, .. } in decl.inputs.iter() {
3662 walk_pattern(cx, &**pattern, scope_stack, scope_map);
3665 walk_block(cx, &**block, scope_stack, scope_map);
3669 ast::ExprCall(ref fn_exp, ref args) => {
3670 walk_expr(cx, &**fn_exp, scope_stack, scope_map);
3672 for arg_exp in args.iter() {
3673 walk_expr(cx, &**arg_exp, scope_stack, scope_map);
3677 ast::ExprMethodCall(_, _, ref args) => {
3678 for arg_exp in args.iter() {
3679 walk_expr(cx, &**arg_exp, scope_stack, scope_map);
3683 ast::ExprMatch(ref discriminant_exp, ref arms, _) => {
3684 walk_expr(cx, &**discriminant_exp, scope_stack, scope_map);
3686 // For each arm we have to first walk the pattern as these might
3687 // introduce new artificial scopes. It should be sufficient to
3688 // walk only one pattern per arm, as they all must contain the
3689 // same binding names.
3691 for arm_ref in arms.iter() {
3692 let arm_span = arm_ref.pats[0].span;
3698 |cx, scope_stack, scope_map| {
3699 for pat in arm_ref.pats.iter() {
3700 walk_pattern(cx, &**pat, scope_stack, scope_map);
3703 for guard_exp in arm_ref.guard.iter() {
3704 walk_expr(cx, &**guard_exp, scope_stack, scope_map)
3707 walk_expr(cx, &*arm_ref.body, scope_stack, scope_map);
3712 ast::ExprStruct(_, ref fields, ref base_exp) => {
3713 for &ast::Field { expr: ref exp, .. } in fields.iter() {
3714 walk_expr(cx, &**exp, scope_stack, scope_map);
3718 Some(ref exp) => walk_expr(cx, &**exp, scope_stack, scope_map),
3723 ast::ExprInlineAsm(ast::InlineAsm { ref inputs,
3726 // inputs, outputs: Vec<(String, P<Expr>)>
3727 for &(_, ref exp) in inputs.iter() {
3728 walk_expr(cx, &**exp, scope_stack, scope_map);
3731 for &(_, ref exp, _) in outputs.iter() {
3732 walk_expr(cx, &**exp, scope_stack, scope_map);
3740 //=-----------------------------------------------------------------------------
3741 // Type Names for Debug Info
3742 //=-----------------------------------------------------------------------------
3744 // Compute the name of the type as it should be stored in debuginfo. Does not do
3745 // any caching, i.e. calling the function twice with the same type will also do
3746 // the work twice. The `qualified` parameter only affects the first level of the
3747 // type name, further levels (i.e. type parameters) are always fully qualified.
3748 fn compute_debuginfo_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
3752 let mut result = String::with_capacity(64);
3753 push_debuginfo_type_name(cx, t, qualified, &mut result);
3757 // Pushes the name of the type as it should be stored in debuginfo on the
3758 // `output` String. See also compute_debuginfo_type_name().
3759 fn push_debuginfo_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
3762 output: &mut String) {
3764 ty::ty_bool => output.push_str("bool"),
3765 ty::ty_char => output.push_str("char"),
3766 ty::ty_str => output.push_str("str"),
3767 ty::ty_int(ast::TyIs(_)) => output.push_str("isize"),
3768 ty::ty_int(ast::TyI8) => output.push_str("i8"),
3769 ty::ty_int(ast::TyI16) => output.push_str("i16"),
3770 ty::ty_int(ast::TyI32) => output.push_str("i32"),
3771 ty::ty_int(ast::TyI64) => output.push_str("i64"),
3772 ty::ty_uint(ast::TyUs(_)) => output.push_str("usize"),
3773 ty::ty_uint(ast::TyU8) => output.push_str("u8"),
3774 ty::ty_uint(ast::TyU16) => output.push_str("u16"),
3775 ty::ty_uint(ast::TyU32) => output.push_str("u32"),
3776 ty::ty_uint(ast::TyU64) => output.push_str("u64"),
3777 ty::ty_float(ast::TyF32) => output.push_str("f32"),
3778 ty::ty_float(ast::TyF64) => output.push_str("f64"),
3779 ty::ty_struct(def_id, substs) |
3780 ty::ty_enum(def_id, substs) => {
3781 push_item_name(cx, def_id, qualified, output);
3782 push_type_params(cx, substs, output);
3784 ty::ty_tup(ref component_types) => {
3786 for &component_type in component_types.iter() {
3787 push_debuginfo_type_name(cx, component_type, true, output);
3788 output.push_str(", ");
3790 if !component_types.is_empty() {
3796 ty::ty_uniq(inner_type) => {
3797 output.push_str("Box<");
3798 push_debuginfo_type_name(cx, inner_type, true, output);
3801 ty::ty_ptr(ty::mt { ty: inner_type, mutbl } ) => {
3804 ast::MutImmutable => output.push_str("const "),
3805 ast::MutMutable => output.push_str("mut "),
3808 push_debuginfo_type_name(cx, inner_type, true, output);
3810 ty::ty_rptr(_, ty::mt { ty: inner_type, mutbl }) => {
3812 if mutbl == ast::MutMutable {
3813 output.push_str("mut ");
3816 push_debuginfo_type_name(cx, inner_type, true, output);
3818 ty::ty_vec(inner_type, optional_length) => {
3820 push_debuginfo_type_name(cx, inner_type, true, output);
3822 match optional_length {
3824 output.push_str(format!("; {}", len).as_slice());
3826 None => { /* nothing to do */ }
3831 ty::ty_trait(ref trait_data) => {
3832 let principal = ty::erase_late_bound_regions(cx.tcx(), &trait_data.principal);
3833 push_item_name(cx, principal.def_id, false, output);
3834 push_type_params(cx, principal.substs, output);
3836 ty::ty_bare_fn(_, &ty::BareFnTy{ unsafety, abi, ref sig } ) => {
3837 if unsafety == ast::Unsafety::Unsafe {
3838 output.push_str("unsafe ");
3841 if abi != ::syntax::abi::Rust {
3842 output.push_str("extern \"");
3843 output.push_str(abi.name());
3844 output.push_str("\" ");
3847 output.push_str("fn(");
3849 let sig = ty::erase_late_bound_regions(cx.tcx(), sig);
3850 if sig.inputs.len() > 0 {
3851 for ¶meter_type in sig.inputs.iter() {
3852 push_debuginfo_type_name(cx, parameter_type, true, output);
3853 output.push_str(", ");
3860 if sig.inputs.len() > 0 {
3861 output.push_str(", ...");
3863 output.push_str("...");
3870 ty::FnConverging(result_type) if ty::type_is_nil(result_type) => {}
3871 ty::FnConverging(result_type) => {
3872 output.push_str(" -> ");
3873 push_debuginfo_type_name(cx, result_type, true, output);
3875 ty::FnDiverging => {
3876 output.push_str(" -> !");
3880 ty::ty_unboxed_closure(..) => {
3881 output.push_str("closure");
3883 ty::ty_projection(ref projection) => {
3884 output.push_str("<");
3885 let self_ty = projection.trait_ref.self_ty();
3886 push_debuginfo_type_name(cx, self_ty, true, output);
3888 output.push_str(" as ");
3890 push_item_name(cx, projection.trait_ref.def_id, false, output);
3891 push_type_params(cx, projection.trait_ref.substs, output);
3893 output.push_str(">::");
3894 output.push_str(token::get_name(projection.item_name).get());
3899 ty::ty_param(_) => {
3900 cx.sess().bug(&format!("debuginfo: Trying to create type name for \
3901 unexpected type: {}", ppaux::ty_to_string(cx.tcx(), t))[]);
3905 fn push_item_name(cx: &CrateContext,
3908 output: &mut String) {
3909 ty::with_path(cx.tcx(), def_id, |mut path| {
3911 if def_id.krate == ast::LOCAL_CRATE {
3912 output.push_str(crate_root_namespace(cx));
3913 output.push_str("::");
3916 let mut path_element_count = 0u;
3917 for path_element in path {
3918 let name = token::get_name(path_element.name());
3919 output.push_str(name.get());
3920 output.push_str("::");
3921 path_element_count += 1;
3924 if path_element_count == 0 {
3925 cx.sess().bug("debuginfo: Encountered empty item path!");
3931 let name = token::get_name(path.last()
3932 .expect("debuginfo: Empty item path?")
3934 output.push_str(name.get());
3939 // Pushes the type parameters in the given `Substs` to the output string.
3940 // This ignores region parameters, since they can't reliably be
3941 // reconstructed for items from non-local crates. For local crates, this
3942 // would be possible but with inlining and LTO we have to use the least
3943 // common denominator - otherwise we would run into conflicts.
3944 fn push_type_params<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
3945 substs: &subst::Substs<'tcx>,
3946 output: &mut String) {
3947 if substs.types.is_empty() {
3953 for &type_parameter in substs.types.iter() {
3954 push_debuginfo_type_name(cx, type_parameter, true, output);
3955 output.push_str(", ");
3966 //=-----------------------------------------------------------------------------
3967 // Namespace Handling
3968 //=-----------------------------------------------------------------------------
3970 struct NamespaceTreeNode {
3973 parent: Option<Weak<NamespaceTreeNode>>,
3976 impl NamespaceTreeNode {
3977 fn mangled_name_of_contained_item(&self, item_name: &str) -> String {
3978 fn fill_nested(node: &NamespaceTreeNode, output: &mut String) {
3980 Some(ref parent) => fill_nested(&*parent.upgrade().unwrap(), output),
3983 let string = token::get_name(node.name);
3984 output.push_str(&format!("{}", string.get().len())[]);
3985 output.push_str(string.get());
3988 let mut name = String::from_str("_ZN");
3989 fill_nested(self, &mut name);
3990 name.push_str(&format!("{}", item_name.len())[]);
3991 name.push_str(item_name);
3997 fn crate_root_namespace<'a>(cx: &'a CrateContext) -> &'a str {
3998 &cx.link_meta().crate_name[]
4001 fn namespace_for_item(cx: &CrateContext, def_id: ast::DefId) -> Rc<NamespaceTreeNode> {
4002 ty::with_path(cx.tcx(), def_id, |path| {
4003 // prepend crate name if not already present
4004 let krate = if def_id.krate == ast::LOCAL_CRATE {
4005 let crate_namespace_ident = token::str_to_ident(crate_root_namespace(cx));
4006 Some(ast_map::PathMod(crate_namespace_ident.name))
4010 let mut path = krate.into_iter().chain(path).peekable();
4012 let mut current_key = Vec::new();
4013 let mut parent_node: Option<Rc<NamespaceTreeNode>> = None;
4015 // Create/Lookup namespace for each element of the path.
4017 // Emulate a for loop so we can use peek below.
4018 let path_element = match path.next() {
4022 // Ignore the name of the item (the last path element).
4023 if path.peek().is_none() {
4027 let name = path_element.name();
4028 current_key.push(name);
4030 let existing_node = debug_context(cx).namespace_map.borrow()
4031 .get(¤t_key).cloned();
4032 let current_node = match existing_node {
4033 Some(existing_node) => existing_node,
4035 // create and insert
4036 let parent_scope = match parent_node {
4037 Some(ref node) => node.scope,
4038 None => ptr::null_mut()
4040 let namespace_name = token::get_name(name);
4041 let namespace_name = CString::from_slice(namespace_name
4043 let scope = unsafe {
4044 llvm::LLVMDIBuilderCreateNameSpace(
4047 namespace_name.as_ptr(),
4048 // cannot reconstruct file ...
4050 // ... or line information, but that's not so important.
4054 let node = Rc::new(NamespaceTreeNode {
4057 parent: parent_node.map(|parent| parent.downgrade()),
4060 debug_context(cx).namespace_map.borrow_mut()
4061 .insert(current_key.clone(), node.clone());
4067 parent_node = Some(current_node);
4073 cx.sess().bug(&format!("debuginfo::namespace_for_item(): \
4074 path too short for {:?}",
4082 //=-----------------------------------------------------------------------------
4083 // .debug_gdb_scripts binary section
4084 //=-----------------------------------------------------------------------------
4086 /// Inserts a side-effect free instruction sequence that makes sure that the
4087 /// .debug_gdb_scripts global is referenced, so it isn't removed by the linker.
4088 pub fn insert_reference_to_gdb_debug_scripts_section_global(ccx: &CrateContext) {
4089 if needs_gdb_debug_scripts_section(ccx) {
4090 let empty = CString::from_slice(b"");
4091 let gdb_debug_scripts_section_global =
4092 get_or_insert_gdb_debug_scripts_section_global(ccx);
4094 let volative_load_instruction =
4095 llvm::LLVMBuildLoad(ccx.raw_builder(),
4096 gdb_debug_scripts_section_global,
4098 llvm::LLVMSetVolatile(volative_load_instruction, llvm::True);
4103 /// Allocates the global variable responsible for the .debug_gdb_scripts binary
4105 fn get_or_insert_gdb_debug_scripts_section_global(ccx: &CrateContext)
4107 let section_var_name = b"__rustc_debug_gdb_scripts_section__\0";
4109 let section_var = unsafe {
4110 llvm::LLVMGetNamedGlobal(ccx.llmod(),
4111 section_var_name.as_ptr() as *const _)
4114 if section_var == ptr::null_mut() {
4115 let section_name = b".debug_gdb_scripts\0";
4116 let section_contents = b"\x01gdb_load_rust_pretty_printers.py\0";
4119 let llvm_type = Type::array(&Type::i8(ccx),
4120 section_contents.len() as u64);
4121 let section_var = llvm::LLVMAddGlobal(ccx.llmod(),
4123 section_var_name.as_ptr()
4125 llvm::LLVMSetSection(section_var, section_name.as_ptr() as *const _);
4126 llvm::LLVMSetInitializer(section_var, C_bytes(ccx, section_contents));
4127 llvm::LLVMSetGlobalConstant(section_var, llvm::True);
4128 llvm::LLVMSetUnnamedAddr(section_var, llvm::True);
4129 llvm::SetLinkage(section_var, llvm::Linkage::LinkOnceODRLinkage);
4130 // This should make sure that the whole section is not larger than
4131 // the string it contains. Otherwise we get a warning from GDB.
4132 llvm::LLVMSetAlignment(section_var, 1);
4140 fn needs_gdb_debug_scripts_section(ccx: &CrateContext) -> bool {
4141 let omit_gdb_pretty_printer_section =
4142 attr::contains_name(ccx.tcx()
4147 "omit_gdb_pretty_printer_section");
4149 !omit_gdb_pretty_printer_section &&
4150 !ccx.sess().target.target.options.is_like_osx &&
4151 !ccx.sess().target.target.options.is_like_windows &&
4152 ccx.sess().opts.debuginfo != NoDebugInfo