1 // Copyright 2012-2015 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 // See doc.rs for documentation.
14 use self::VariableAccess::*;
15 use self::VariableKind::*;
17 use self::utils::{DIB, span_start, create_DIArray, is_node_local_to_unit};
18 use self::namespace::mangled_name_of_item;
19 use self::type_names::compute_debuginfo_type_name;
20 use self::metadata::{type_metadata, file_metadata, TypeMap};
21 use self::source_loc::InternalDebugLocation::{self, UnknownLocation};
24 use llvm::{ModuleRef, ContextRef, ValueRef};
25 use llvm::debuginfo::{DIFile, DIType, DIScope, DIBuilderRef, DISubprogram, DIArray, DIFlags};
26 use rustc::hir::def_id::DefId;
27 use rustc::ty::subst::Substs;
30 use common::{self, CrateContext};
32 use monomorphize::Instance;
33 use rustc::ty::{self, Ty};
35 use session::config::{self, FullDebugInfo, LimitedDebugInfo, NoDebugInfo};
36 use util::nodemap::{DefIdMap, FxHashMap, FxHashSet};
39 use std::cell::{Cell, RefCell};
40 use std::ffi::CString;
43 use syntax_pos::{self, Span, Pos};
45 use rustc::ty::layout;
55 pub use self::create_scope_map::{create_mir_scopes, MirDebugScope};
56 pub use self::source_loc::start_emitting_source_locations;
57 pub use self::metadata::create_global_var_metadata;
58 pub use self::metadata::extend_scope_to_file;
59 pub use self::source_loc::set_source_location;
61 #[allow(non_upper_case_globals)]
62 const DW_TAG_auto_variable: c_uint = 0x100;
63 #[allow(non_upper_case_globals)]
64 const DW_TAG_arg_variable: c_uint = 0x101;
66 /// A context object for maintaining all state needed by the debuginfo module.
67 pub struct CrateDebugContext<'tcx> {
68 llcontext: ContextRef,
69 builder: DIBuilderRef,
70 created_files: RefCell<FxHashMap<String, DIFile>>,
71 created_enum_disr_types: RefCell<FxHashMap<(DefId, layout::Integer), DIType>>,
73 type_map: RefCell<TypeMap<'tcx>>,
74 namespace_map: RefCell<DefIdMap<DIScope>>,
76 // This collection is used to assert that composite types (structs, enums,
77 // ...) have their members only set once:
78 composite_types_completed: RefCell<FxHashSet<DIType>>,
81 impl<'tcx> CrateDebugContext<'tcx> {
82 pub fn new(llmod: ModuleRef) -> CrateDebugContext<'tcx> {
83 debug!("CrateDebugContext::new");
84 let builder = unsafe { llvm::LLVMRustDIBuilderCreate(llmod) };
85 // DIBuilder inherits context from the module, so we'd better use the same one
86 let llcontext = unsafe { llvm::LLVMGetModuleContext(llmod) };
90 created_files: RefCell::new(FxHashMap()),
91 created_enum_disr_types: RefCell::new(FxHashMap()),
92 type_map: RefCell::new(TypeMap::new()),
93 namespace_map: RefCell::new(DefIdMap()),
94 composite_types_completed: RefCell::new(FxHashSet()),
99 pub enum FunctionDebugContext {
100 RegularContext(FunctionDebugContextData),
102 FunctionWithoutDebugInfo,
105 impl FunctionDebugContext {
106 fn get_ref<'a>(&'a self, span: Span) -> &'a FunctionDebugContextData {
108 FunctionDebugContext::RegularContext(ref data) => data,
109 FunctionDebugContext::DebugInfoDisabled => {
110 span_bug!(span, "{}", FunctionDebugContext::debuginfo_disabled_message());
112 FunctionDebugContext::FunctionWithoutDebugInfo => {
113 span_bug!(span, "{}", FunctionDebugContext::should_be_ignored_message());
118 fn debuginfo_disabled_message() -> &'static str {
119 "debuginfo: Error trying to access FunctionDebugContext although debug info is disabled!"
122 fn should_be_ignored_message() -> &'static str {
123 "debuginfo: Error trying to access FunctionDebugContext for function that should be \
124 ignored by debug info!"
128 pub struct FunctionDebugContextData {
129 fn_metadata: DISubprogram,
130 source_locations_enabled: Cell<bool>,
133 pub enum VariableAccess<'a> {
134 // The llptr given is an alloca containing the variable's value
135 DirectVariable { alloca: ValueRef },
136 // The llptr given is an alloca containing the start of some pointer chain
137 // leading to the variable's content.
138 IndirectVariable { alloca: ValueRef, address_operations: &'a [i64] }
141 pub enum VariableKind {
142 ArgumentVariable(usize /*index*/),
147 /// Create any deferred debug metadata nodes
148 pub fn finalize(cx: &CrateContext) {
149 if cx.dbg_cx().is_none() {
155 if gdb::needs_gdb_debug_scripts_section(cx) {
156 // Add a .debug_gdb_scripts section to this compile-unit. This will
157 // cause GDB to try and load the gdb_load_rust_pretty_printers.py file,
158 // which activates the Rust pretty printers for binary this section is
160 gdb::get_or_insert_gdb_debug_scripts_section_global(cx);
164 llvm::LLVMRustDIBuilderFinalize(DIB(cx));
165 llvm::LLVMRustDIBuilderDispose(DIB(cx));
166 // Debuginfo generation in LLVM by default uses a higher
167 // version of dwarf than macOS currently understands. We can
168 // instruct LLVM to emit an older version of dwarf, however,
169 // for macOS to understand. For more info see #11352
170 // This can be overridden using --llvm-opts -dwarf-version,N.
171 // Android has the same issue (#22398)
172 if cx.sess().target.target.options.is_like_osx ||
173 cx.sess().target.target.options.is_like_android {
174 llvm::LLVMRustAddModuleFlag(cx.llmod(),
175 "Dwarf Version\0".as_ptr() as *const _,
179 // Indicate that we want CodeView debug information on MSVC
180 if cx.sess().target.target.options.is_like_msvc {
181 llvm::LLVMRustAddModuleFlag(cx.llmod(),
182 "CodeView\0".as_ptr() as *const _,
186 // Prevent bitcode readers from deleting the debug info.
187 let ptr = "Debug Info Version\0".as_ptr();
188 llvm::LLVMRustAddModuleFlag(cx.llmod(), ptr as *const _,
189 llvm::LLVMRustDebugMetadataVersion());
193 /// Creates the function-specific debug context.
195 /// Returns the FunctionDebugContext for the function which holds state needed
196 /// for debug info creation. The function may also return another variant of the
197 /// FunctionDebugContext enum which indicates why no debuginfo should be created
198 /// for the function.
199 pub fn create_function_debug_context<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
200 instance: Instance<'tcx>,
201 sig: ty::FnSig<'tcx>,
203 mir: &mir::Mir) -> FunctionDebugContext {
204 if cx.sess().opts.debuginfo == NoDebugInfo {
205 return FunctionDebugContext::DebugInfoDisabled;
208 for attr in cx.tcx().get_attrs(instance.def).iter() {
209 if attr.check_name("no_debug") {
210 return FunctionDebugContext::FunctionWithoutDebugInfo;
214 let containing_scope = get_containing_scope(cx, instance);
217 // This can be the case for functions inlined from another crate
218 if span == syntax_pos::DUMMY_SP {
219 // FIXME(simulacrum): Probably can't happen; remove.
220 return FunctionDebugContext::FunctionWithoutDebugInfo;
223 let loc = span_start(cx, span);
224 let file_metadata = file_metadata(cx, &loc.file.name, &loc.file.abs_path);
226 let function_type_metadata = unsafe {
227 let fn_signature = get_function_signature(cx, sig);
228 llvm::LLVMRustDIBuilderCreateSubroutineType(DIB(cx), file_metadata, fn_signature)
231 // Find the enclosing function, in case this is a closure.
232 let def_key = cx.tcx().def_key(instance.def);
233 let mut name = def_key.disambiguated_data.data.to_string();
234 let name_len = name.len();
236 let fn_def_id = cx.tcx().closure_base_def_id(instance.def);
238 // Get_template_parameters() will append a `<...>` clause to the function
239 // name if necessary.
240 let generics = cx.tcx().item_generics(fn_def_id);
241 let substs = instance.substs.truncate_to(cx.tcx(), generics);
242 let template_parameters = get_template_parameters(cx,
248 // Build the linkage_name out of the item path and "template" parameters.
249 let linkage_name = mangled_name_of_item(cx, instance.def, &name[name_len..]);
251 let scope_line = span_start(cx, span).line;
253 let local_id = cx.tcx().hir.as_local_node_id(instance.def);
254 let is_local_to_unit = local_id.map_or(false, |id| is_node_local_to_unit(cx, id));
256 let function_name = CString::new(name).unwrap();
257 let linkage_name = CString::new(linkage_name).unwrap();
259 let mut flags = DIFlags::FlagPrototyped;
260 match *cx.sess().entry_fn.borrow() {
262 if local_id == Some(id) {
263 flags = flags | DIFlags::FlagMainSubprogram;
269 let fn_metadata = unsafe {
270 llvm::LLVMRustDIBuilderCreateFunction(
273 function_name.as_ptr(),
274 linkage_name.as_ptr(),
277 function_type_metadata,
280 scope_line as c_uint,
282 cx.sess().opts.optimize != config::OptLevel::No,
288 // Initialize fn debug context (including scope map and namespace map)
289 let fn_debug_context = FunctionDebugContextData {
290 fn_metadata: fn_metadata,
291 source_locations_enabled: Cell::new(false),
294 return FunctionDebugContext::RegularContext(fn_debug_context);
296 fn get_function_signature<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
297 sig: ty::FnSig<'tcx>) -> DIArray {
298 if cx.sess().opts.debuginfo == LimitedDebugInfo {
299 return create_DIArray(DIB(cx), &[]);
302 let mut signature = Vec::with_capacity(sig.inputs().len() + 1);
304 // Return type -- llvm::DIBuilder wants this at index 0
305 signature.push(match sig.output().sty {
306 ty::TyTuple(ref tys, _) if tys.is_empty() => ptr::null_mut(),
307 _ => type_metadata(cx, sig.output(), syntax_pos::DUMMY_SP)
310 let inputs = if sig.abi == Abi::RustCall {
311 &sig.inputs()[..sig.inputs().len() - 1]
317 for &argument_type in inputs {
318 signature.push(type_metadata(cx, argument_type, syntax_pos::DUMMY_SP));
321 if sig.abi == Abi::RustCall && !sig.inputs().is_empty() {
322 if let ty::TyTuple(args, _) = sig.inputs()[sig.inputs().len() - 1].sty {
323 for &argument_type in args {
324 signature.push(type_metadata(cx, argument_type, syntax_pos::DUMMY_SP));
329 return create_DIArray(DIB(cx), &signature[..]);
332 fn get_template_parameters<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
333 generics: &ty::Generics,
334 substs: &Substs<'tcx>,
335 file_metadata: DIFile,
336 name_to_append_suffix_to: &mut String)
339 if substs.types().next().is_none() {
340 return create_DIArray(DIB(cx), &[]);
343 name_to_append_suffix_to.push('<');
344 for (i, actual_type) in substs.types().enumerate() {
346 name_to_append_suffix_to.push_str(",");
349 let actual_type = cx.tcx().normalize_associated_type(&actual_type);
350 // Add actual type name to <...> clause of function name
351 let actual_type_name = compute_debuginfo_type_name(cx,
354 name_to_append_suffix_to.push_str(&actual_type_name[..]);
356 name_to_append_suffix_to.push('>');
358 // Again, only create type information if full debuginfo is enabled
359 let template_params: Vec<_> = if cx.sess().opts.debuginfo == FullDebugInfo {
360 let names = get_type_parameter_names(cx, generics);
361 substs.types().zip(names).map(|(ty, name)| {
362 let actual_type = cx.tcx().normalize_associated_type(&ty);
363 let actual_type_metadata = type_metadata(cx, actual_type, syntax_pos::DUMMY_SP);
364 let name = CString::new(name.as_str().as_bytes()).unwrap();
366 llvm::LLVMRustDIBuilderCreateTemplateTypeParameter(
370 actual_type_metadata,
380 return create_DIArray(DIB(cx), &template_params[..]);
383 fn get_type_parameter_names(cx: &CrateContext, generics: &ty::Generics) -> Vec<ast::Name> {
384 let mut names = generics.parent.map_or(vec![], |def_id| {
385 get_type_parameter_names(cx, cx.tcx().item_generics(def_id))
387 names.extend(generics.types.iter().map(|param| param.name));
391 fn get_containing_scope<'ccx, 'tcx>(cx: &CrateContext<'ccx, 'tcx>,
392 instance: Instance<'tcx>)
394 // First, let's see if this is a method within an inherent impl. Because
395 // if yes, we want to make the result subroutine DIE a child of the
396 // subroutine's self-type.
397 let self_type = cx.tcx().impl_of_method(instance.def).and_then(|impl_def_id| {
398 // If the method does *not* belong to a trait, proceed
399 if cx.tcx().trait_id_of_impl(impl_def_id).is_none() {
401 common::def_ty(cx.shared(), impl_def_id, instance.substs);
403 // Only "class" methods are generally understood by LLVM,
404 // so avoid methods on other types (e.g. `<*mut T>::null`).
405 match impl_self_ty.sty {
406 ty::TyAdt(def, ..) if !def.is_box() => {
407 Some(type_metadata(cx, impl_self_ty, syntax_pos::DUMMY_SP))
412 // For trait method impls we still use the "parallel namespace"
418 self_type.unwrap_or_else(|| {
419 namespace::item_namespace(cx, DefId {
420 krate: instance.def.krate,
422 .def_key(instance.def)
424 .expect("get_containing_scope: missing parent?")
430 pub fn declare_local<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
431 dbg_context: &FunctionDebugContext,
432 variable_name: ast::Name,
433 variable_type: Ty<'tcx>,
434 scope_metadata: DIScope,
435 variable_access: VariableAccess,
436 variable_kind: VariableKind,
440 let file = span_start(cx, span).file;
441 let filename = file.name.clone();
442 let file_metadata = file_metadata(cx, &filename[..], &file.abs_path);
444 let loc = span_start(cx, span);
445 let type_metadata = type_metadata(cx, variable_type, span);
447 let (argument_index, dwarf_tag) = match variable_kind {
448 ArgumentVariable(index) => (index as c_uint, DW_TAG_arg_variable),
450 CapturedVariable => (0, DW_TAG_auto_variable)
452 let align = ::type_of::align_of(cx, variable_type);
454 let name = CString::new(variable_name.as_str().as_bytes()).unwrap();
455 match (variable_access, &[][..]) {
456 (DirectVariable { alloca }, address_operations) |
457 (IndirectVariable {alloca, address_operations}, _) => {
458 let metadata = unsafe {
459 llvm::LLVMRustDIBuilderCreateVariable(
467 cx.sess().opts.optimize != config::OptLevel::No,
473 source_loc::set_debug_location(bcx,
474 InternalDebugLocation::new(scope_metadata, loc.line, loc.col.to_usize()));
476 let debug_loc = llvm::LLVMGetCurrentDebugLocation(bcx.llbuilder);
477 let instr = llvm::LLVMRustDIBuilderInsertDeclareAtEnd(
481 address_operations.as_ptr(),
482 address_operations.len() as c_uint,
486 llvm::LLVMSetInstDebugLocation(bcx.llbuilder, instr);
491 match variable_kind {
492 ArgumentVariable(_) | CapturedVariable => {
493 assert!(!dbg_context.get_ref(span).source_locations_enabled.get());
494 source_loc::set_debug_location(bcx, UnknownLocation);
496 _ => { /* nothing to do */ }