1 //===-- Function.cpp ------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "lldb/Symbol/Function.h"
10 #include "lldb/Core/Debugger.h"
11 #include "lldb/Core/Disassembler.h"
12 #include "lldb/Core/Module.h"
13 #include "lldb/Core/ModuleList.h"
14 #include "lldb/Core/Section.h"
15 #include "lldb/Host/Host.h"
16 #include "lldb/Symbol/CompileUnit.h"
17 #include "lldb/Symbol/CompilerType.h"
18 #include "lldb/Symbol/LineTable.h"
19 #include "lldb/Symbol/SymbolFile.h"
20 #include "lldb/Target/Language.h"
21 #include "lldb/Target/Target.h"
22 #include "lldb/Utility/LLDBLog.h"
23 #include "lldb/Utility/Log.h"
24 #include "llvm/Support/Casting.h"
25 
26 using namespace lldb;
27 using namespace lldb_private;
28 
29 // Basic function information is contained in the FunctionInfo class. It is
30 // designed to contain the name, linkage name, and declaration location.
31 FunctionInfo::FunctionInfo(const char *name, const Declaration *decl_ptr)
32     : m_name(name), m_declaration(decl_ptr) {}
33 
34 FunctionInfo::FunctionInfo(ConstString name, const Declaration *decl_ptr)
35     : m_name(name), m_declaration(decl_ptr) {}
36 
37 FunctionInfo::~FunctionInfo() = default;
38 
39 void FunctionInfo::Dump(Stream *s, bool show_fullpaths) const {
40   if (m_name)
41     *s << ", name = \"" << m_name << "\"";
42   m_declaration.Dump(s, show_fullpaths);
43 }
44 
45 int FunctionInfo::Compare(const FunctionInfo &a, const FunctionInfo &b) {
46   int result = ConstString::Compare(a.GetName(), b.GetName());
47   if (result)
48     return result;
49 
50   return Declaration::Compare(a.m_declaration, b.m_declaration);
51 }
52 
53 Declaration &FunctionInfo::GetDeclaration() { return m_declaration; }
54 
55 const Declaration &FunctionInfo::GetDeclaration() const {
56   return m_declaration;
57 }
58 
59 ConstString FunctionInfo::GetName() const { return m_name; }
60 
61 size_t FunctionInfo::MemorySize() const {
62   return m_name.MemorySize() + m_declaration.MemorySize();
63 }
64 
65 InlineFunctionInfo::InlineFunctionInfo(const char *name,
66                                        llvm::StringRef mangled,
67                                        const Declaration *decl_ptr,
68                                        const Declaration *call_decl_ptr)
69     : FunctionInfo(name, decl_ptr), m_mangled(mangled),
70       m_call_decl(call_decl_ptr) {}
71 
72 InlineFunctionInfo::InlineFunctionInfo(ConstString name,
73                                        const Mangled &mangled,
74                                        const Declaration *decl_ptr,
75                                        const Declaration *call_decl_ptr)
76     : FunctionInfo(name, decl_ptr), m_mangled(mangled),
77       m_call_decl(call_decl_ptr) {}
78 
79 InlineFunctionInfo::~InlineFunctionInfo() = default;
80 
81 void InlineFunctionInfo::Dump(Stream *s, bool show_fullpaths) const {
82   FunctionInfo::Dump(s, show_fullpaths);
83   if (m_mangled)
84     m_mangled.Dump(s);
85 }
86 
87 void InlineFunctionInfo::DumpStopContext(Stream *s) const {
88   //    s->Indent("[inlined] ");
89   s->Indent();
90   if (m_mangled)
91     s->PutCString(m_mangled.GetName().AsCString());
92   else
93     s->PutCString(m_name.AsCString());
94 }
95 
96 ConstString InlineFunctionInfo::GetName() const {
97   if (m_mangled)
98     return m_mangled.GetName();
99   return m_name;
100 }
101 
102 ConstString InlineFunctionInfo::GetDisplayName() const {
103   if (m_mangled)
104     return m_mangled.GetDisplayDemangledName();
105   return m_name;
106 }
107 
108 Declaration &InlineFunctionInfo::GetCallSite() { return m_call_decl; }
109 
110 const Declaration &InlineFunctionInfo::GetCallSite() const {
111   return m_call_decl;
112 }
113 
114 Mangled &InlineFunctionInfo::GetMangled() { return m_mangled; }
115 
116 const Mangled &InlineFunctionInfo::GetMangled() const { return m_mangled; }
117 
118 size_t InlineFunctionInfo::MemorySize() const {
119   return FunctionInfo::MemorySize() + m_mangled.MemorySize();
120 }
121 
122 /// @name Call site related structures
123 /// @{
124 
125 lldb::addr_t CallEdge::GetLoadAddress(lldb::addr_t unresolved_pc,
126                                       Function &caller, Target &target) {
127   Log *log = GetLog(LLDBLog::Step);
128 
129   const Address &caller_start_addr = caller.GetAddressRange().GetBaseAddress();
130 
131   ModuleSP caller_module_sp = caller_start_addr.GetModule();
132   if (!caller_module_sp) {
133     LLDB_LOG(log, "GetLoadAddress: cannot get Module for caller");
134     return LLDB_INVALID_ADDRESS;
135   }
136 
137   SectionList *section_list = caller_module_sp->GetSectionList();
138   if (!section_list) {
139     LLDB_LOG(log, "GetLoadAddress: cannot get SectionList for Module");
140     return LLDB_INVALID_ADDRESS;
141   }
142 
143   Address the_addr = Address(unresolved_pc, section_list);
144   lldb::addr_t load_addr = the_addr.GetLoadAddress(&target);
145   return load_addr;
146 }
147 
148 lldb::addr_t CallEdge::GetReturnPCAddress(Function &caller,
149                                           Target &target) const {
150   return GetLoadAddress(GetUnresolvedReturnPCAddress(), caller, target);
151 }
152 
153 void DirectCallEdge::ParseSymbolFileAndResolve(ModuleList &images) {
154   if (resolved)
155     return;
156 
157   Log *log = GetLog(LLDBLog::Step);
158   LLDB_LOG(log, "DirectCallEdge: Lazily parsing the call graph for {0}",
159            lazy_callee.symbol_name);
160 
161   auto resolve_lazy_callee = [&]() -> Function * {
162     ConstString callee_name{lazy_callee.symbol_name};
163     SymbolContextList sc_list;
164     images.FindFunctionSymbols(callee_name, eFunctionNameTypeAuto, sc_list);
165     size_t num_matches = sc_list.GetSize();
166     if (num_matches == 0 || !sc_list[0].symbol) {
167       LLDB_LOG(log,
168                "DirectCallEdge: Found no symbols for {0}, cannot resolve it",
169                callee_name);
170       return nullptr;
171     }
172     Address callee_addr = sc_list[0].symbol->GetAddress();
173     if (!callee_addr.IsValid()) {
174       LLDB_LOG(log, "DirectCallEdge: Invalid symbol address");
175       return nullptr;
176     }
177     Function *f = callee_addr.CalculateSymbolContextFunction();
178     if (!f) {
179       LLDB_LOG(log, "DirectCallEdge: Could not find complete function");
180       return nullptr;
181     }
182     return f;
183   };
184   lazy_callee.def = resolve_lazy_callee();
185   resolved = true;
186 }
187 
188 Function *DirectCallEdge::GetCallee(ModuleList &images, ExecutionContext &) {
189   ParseSymbolFileAndResolve(images);
190   assert(resolved && "Did not resolve lazy callee");
191   return lazy_callee.def;
192 }
193 
194 Function *IndirectCallEdge::GetCallee(ModuleList &images,
195                                       ExecutionContext &exe_ctx) {
196   Log *log = GetLog(LLDBLog::Step);
197   Status error;
198   Value callee_addr_val;
199   if (!call_target.Evaluate(&exe_ctx, exe_ctx.GetRegisterContext(),
200                             /*initial_value_ptr=*/nullptr,
201                             /*object_address_ptr=*/nullptr, callee_addr_val,
202                             &error)) {
203     LLDB_LOGF(log, "IndirectCallEdge: Could not evaluate expression: %s",
204               error.AsCString());
205     return nullptr;
206   }
207 
208   addr_t raw_addr = callee_addr_val.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
209   if (raw_addr == LLDB_INVALID_ADDRESS) {
210     LLDB_LOG(log, "IndirectCallEdge: Could not extract address from scalar");
211     return nullptr;
212   }
213 
214   Address callee_addr;
215   if (!exe_ctx.GetTargetPtr()->ResolveLoadAddress(raw_addr, callee_addr)) {
216     LLDB_LOG(log, "IndirectCallEdge: Could not resolve callee's load address");
217     return nullptr;
218   }
219 
220   Function *f = callee_addr.CalculateSymbolContextFunction();
221   if (!f) {
222     LLDB_LOG(log, "IndirectCallEdge: Could not find complete function");
223     return nullptr;
224   }
225 
226   return f;
227 }
228 
229 /// @}
230 
231 //
232 Function::Function(CompileUnit *comp_unit, lldb::user_id_t func_uid,
233                    lldb::user_id_t type_uid, const Mangled &mangled, Type *type,
234                    const AddressRange &range)
235     : UserID(func_uid), m_comp_unit(comp_unit), m_type_uid(type_uid),
236       m_type(type), m_mangled(mangled), m_block(func_uid), m_range(range),
237       m_frame_base(), m_flags(), m_prologue_byte_size(0) {
238   m_block.SetParentScope(this);
239   assert(comp_unit != nullptr);
240 }
241 
242 Function::~Function() = default;
243 
244 void Function::GetStartLineSourceInfo(FileSpec &source_file,
245                                       uint32_t &line_no) {
246   line_no = 0;
247   source_file.Clear();
248 
249   if (m_comp_unit == nullptr)
250     return;
251 
252   // Initialize m_type if it hasn't been initialized already
253   GetType();
254 
255   if (m_type != nullptr && m_type->GetDeclaration().GetLine() != 0) {
256     source_file = m_type->GetDeclaration().GetFile();
257     line_no = m_type->GetDeclaration().GetLine();
258   } else {
259     LineTable *line_table = m_comp_unit->GetLineTable();
260     if (line_table == nullptr)
261       return;
262 
263     LineEntry line_entry;
264     if (line_table->FindLineEntryByAddress(GetAddressRange().GetBaseAddress(),
265                                            line_entry, nullptr)) {
266       line_no = line_entry.line;
267       source_file = line_entry.file;
268     }
269   }
270 }
271 
272 void Function::GetEndLineSourceInfo(FileSpec &source_file, uint32_t &line_no) {
273   line_no = 0;
274   source_file.Clear();
275 
276   // The -1 is kind of cheesy, but I want to get the last line entry for the
277   // given function, not the first entry of the next.
278   Address scratch_addr(GetAddressRange().GetBaseAddress());
279   scratch_addr.SetOffset(scratch_addr.GetOffset() +
280                          GetAddressRange().GetByteSize() - 1);
281 
282   LineTable *line_table = m_comp_unit->GetLineTable();
283   if (line_table == nullptr)
284     return;
285 
286   LineEntry line_entry;
287   if (line_table->FindLineEntryByAddress(scratch_addr, line_entry, nullptr)) {
288     line_no = line_entry.line;
289     source_file = line_entry.file;
290   }
291 }
292 
293 llvm::ArrayRef<std::unique_ptr<CallEdge>> Function::GetCallEdges() {
294   std::lock_guard<std::mutex> guard(m_call_edges_lock);
295 
296   if (m_call_edges_resolved)
297     return m_call_edges;
298 
299   Log *log = GetLog(LLDBLog::Step);
300   LLDB_LOG(log, "GetCallEdges: Attempting to parse call site info for {0}",
301            GetDisplayName());
302 
303   m_call_edges_resolved = true;
304 
305   // Find the SymbolFile which provided this function's definition.
306   Block &block = GetBlock(/*can_create*/true);
307   SymbolFile *sym_file = block.GetSymbolFile();
308   if (!sym_file)
309     return llvm::None;
310 
311   // Lazily read call site information from the SymbolFile.
312   m_call_edges = sym_file->ParseCallEdgesInFunction(GetID());
313 
314   // Sort the call edges to speed up return_pc lookups.
315   llvm::sort(m_call_edges, [](const std::unique_ptr<CallEdge> &LHS,
316                               const std::unique_ptr<CallEdge> &RHS) {
317     return LHS->GetSortKey() < RHS->GetSortKey();
318   });
319 
320   return m_call_edges;
321 }
322 
323 llvm::ArrayRef<std::unique_ptr<CallEdge>> Function::GetTailCallingEdges() {
324   // Tail calling edges are sorted at the end of the list. Find them by dropping
325   // all non-tail-calls.
326   return GetCallEdges().drop_until(
327       [](const std::unique_ptr<CallEdge> &edge) { return edge->IsTailCall(); });
328 }
329 
330 CallEdge *Function::GetCallEdgeForReturnAddress(addr_t return_pc,
331                                                 Target &target) {
332   auto edges = GetCallEdges();
333   auto edge_it =
334       llvm::partition_point(edges, [&](const std::unique_ptr<CallEdge> &edge) {
335         return std::make_pair(edge->IsTailCall(),
336                               edge->GetReturnPCAddress(*this, target)) <
337                std::make_pair(false, return_pc);
338       });
339   if (edge_it == edges.end() ||
340       edge_it->get()->GetReturnPCAddress(*this, target) != return_pc)
341     return nullptr;
342   return edge_it->get();
343 }
344 
345 Block &Function::GetBlock(bool can_create) {
346   if (!m_block.BlockInfoHasBeenParsed() && can_create) {
347     ModuleSP module_sp = CalculateSymbolContextModule();
348     if (module_sp) {
349       module_sp->GetSymbolFile()->ParseBlocksRecursive(*this);
350     } else {
351       Debugger::ReportError(llvm::formatv(
352           "unable to find module shared pointer for function '{0}' in {1}",
353           GetName().GetCString(), m_comp_unit->GetPrimaryFile().GetPath()));
354     }
355     m_block.SetBlockInfoHasBeenParsed(true, true);
356   }
357   return m_block;
358 }
359 
360 CompileUnit *Function::GetCompileUnit() { return m_comp_unit; }
361 
362 const CompileUnit *Function::GetCompileUnit() const { return m_comp_unit; }
363 
364 void Function::GetDescription(Stream *s, lldb::DescriptionLevel level,
365                               Target *target) {
366   ConstString name = GetName();
367   ConstString mangled = m_mangled.GetMangledName();
368 
369   *s << "id = " << (const UserID &)*this;
370   if (name)
371     s->AsRawOstream() << ", name = \"" << name << '"';
372   if (mangled)
373     s->AsRawOstream() << ", mangled = \"" << mangled << '"';
374   *s << ", range = ";
375   Address::DumpStyle fallback_style;
376   if (level == eDescriptionLevelVerbose)
377     fallback_style = Address::DumpStyleModuleWithFileAddress;
378   else
379     fallback_style = Address::DumpStyleFileAddress;
380   GetAddressRange().Dump(s, target, Address::DumpStyleLoadAddress,
381                          fallback_style);
382 }
383 
384 void Function::Dump(Stream *s, bool show_context) const {
385   s->Printf("%p: ", static_cast<const void *>(this));
386   s->Indent();
387   *s << "Function" << static_cast<const UserID &>(*this);
388 
389   m_mangled.Dump(s);
390 
391   if (m_type)
392     s->Printf(", type = %p", static_cast<void *>(m_type));
393   else if (m_type_uid != LLDB_INVALID_UID)
394     s->Printf(", type_uid = 0x%8.8" PRIx64, m_type_uid);
395 
396   s->EOL();
397   // Dump the root object
398   if (m_block.BlockInfoHasBeenParsed())
399     m_block.Dump(s, m_range.GetBaseAddress().GetFileAddress(), INT_MAX,
400                  show_context);
401 }
402 
403 void Function::CalculateSymbolContext(SymbolContext *sc) {
404   sc->function = this;
405   m_comp_unit->CalculateSymbolContext(sc);
406 }
407 
408 ModuleSP Function::CalculateSymbolContextModule() {
409   SectionSP section_sp(m_range.GetBaseAddress().GetSection());
410   if (section_sp)
411     return section_sp->GetModule();
412 
413   return this->GetCompileUnit()->GetModule();
414 }
415 
416 CompileUnit *Function::CalculateSymbolContextCompileUnit() {
417   return this->GetCompileUnit();
418 }
419 
420 Function *Function::CalculateSymbolContextFunction() { return this; }
421 
422 lldb::DisassemblerSP Function::GetInstructions(const ExecutionContext &exe_ctx,
423                                                const char *flavor,
424                                                bool prefer_file_cache) {
425   ModuleSP module_sp(GetAddressRange().GetBaseAddress().GetModule());
426   if (module_sp && exe_ctx.HasTargetScope()) {
427     return Disassembler::DisassembleRange(module_sp->GetArchitecture(), nullptr,
428                                           flavor, exe_ctx.GetTargetRef(),
429                                           GetAddressRange(), !prefer_file_cache);
430   }
431   return lldb::DisassemblerSP();
432 }
433 
434 bool Function::GetDisassembly(const ExecutionContext &exe_ctx,
435                               const char *flavor, Stream &strm,
436                               bool prefer_file_cache) {
437   lldb::DisassemblerSP disassembler_sp =
438       GetInstructions(exe_ctx, flavor, prefer_file_cache);
439   if (disassembler_sp) {
440     const bool show_address = true;
441     const bool show_bytes = false;
442     disassembler_sp->GetInstructionList().Dump(&strm, show_address, show_bytes,
443                                                &exe_ctx);
444     return true;
445   }
446   return false;
447 }
448 
449 // Symbol *
450 // Function::CalculateSymbolContextSymbol ()
451 //{
452 //    return // TODO: find the symbol for the function???
453 //}
454 
455 void Function::DumpSymbolContext(Stream *s) {
456   m_comp_unit->DumpSymbolContext(s);
457   s->Printf(", Function{0x%8.8" PRIx64 "}", GetID());
458 }
459 
460 size_t Function::MemorySize() const {
461   size_t mem_size = sizeof(Function) + m_block.MemorySize();
462   return mem_size;
463 }
464 
465 bool Function::GetIsOptimized() {
466   bool result = false;
467 
468   // Currently optimization is only indicted by the vendor extension
469   // DW_AT_APPLE_optimized which is set on a compile unit level.
470   if (m_comp_unit) {
471     result = m_comp_unit->GetIsOptimized();
472   }
473   return result;
474 }
475 
476 bool Function::IsTopLevelFunction() {
477   bool result = false;
478 
479   if (Language *language = Language::FindPlugin(GetLanguage()))
480     result = language->IsTopLevelFunction(*this);
481 
482   return result;
483 }
484 
485 ConstString Function::GetDisplayName() const {
486   return m_mangled.GetDisplayDemangledName();
487 }
488 
489 CompilerDeclContext Function::GetDeclContext() {
490   ModuleSP module_sp = CalculateSymbolContextModule();
491 
492   if (module_sp) {
493     if (SymbolFile *sym_file = module_sp->GetSymbolFile())
494       return sym_file->GetDeclContextForUID(GetID());
495   }
496   return CompilerDeclContext();
497 }
498 
499 Type *Function::GetType() {
500   if (m_type == nullptr) {
501     SymbolContext sc;
502 
503     CalculateSymbolContext(&sc);
504 
505     if (!sc.module_sp)
506       return nullptr;
507 
508     SymbolFile *sym_file = sc.module_sp->GetSymbolFile();
509 
510     if (sym_file == nullptr)
511       return nullptr;
512 
513     m_type = sym_file->ResolveTypeUID(m_type_uid);
514   }
515   return m_type;
516 }
517 
518 const Type *Function::GetType() const { return m_type; }
519 
520 CompilerType Function::GetCompilerType() {
521   Type *function_type = GetType();
522   if (function_type)
523     return function_type->GetFullCompilerType();
524   return CompilerType();
525 }
526 
527 uint32_t Function::GetPrologueByteSize() {
528   if (m_prologue_byte_size == 0 &&
529       m_flags.IsClear(flagsCalculatedPrologueSize)) {
530     m_flags.Set(flagsCalculatedPrologueSize);
531     LineTable *line_table = m_comp_unit->GetLineTable();
532     uint32_t prologue_end_line_idx = 0;
533 
534     if (line_table) {
535       LineEntry first_line_entry;
536       uint32_t first_line_entry_idx = UINT32_MAX;
537       if (line_table->FindLineEntryByAddress(GetAddressRange().GetBaseAddress(),
538                                              first_line_entry,
539                                              &first_line_entry_idx)) {
540         // Make sure the first line entry isn't already the end of the prologue
541         addr_t prologue_end_file_addr = LLDB_INVALID_ADDRESS;
542         addr_t line_zero_end_file_addr = LLDB_INVALID_ADDRESS;
543 
544         if (first_line_entry.is_prologue_end) {
545           prologue_end_file_addr =
546               first_line_entry.range.GetBaseAddress().GetFileAddress();
547           prologue_end_line_idx = first_line_entry_idx;
548         } else {
549           // Check the first few instructions and look for one that has
550           // is_prologue_end set to true.
551           const uint32_t last_line_entry_idx = first_line_entry_idx + 6;
552           for (uint32_t idx = first_line_entry_idx + 1;
553                idx < last_line_entry_idx; ++idx) {
554             LineEntry line_entry;
555             if (line_table->GetLineEntryAtIndex(idx, line_entry)) {
556               if (line_entry.is_prologue_end) {
557                 prologue_end_file_addr =
558                     line_entry.range.GetBaseAddress().GetFileAddress();
559                 prologue_end_line_idx = idx;
560                 break;
561               }
562             }
563           }
564         }
565 
566         // If we didn't find the end of the prologue in the line tables, then
567         // just use the end address of the first line table entry
568         if (prologue_end_file_addr == LLDB_INVALID_ADDRESS) {
569           // Check the first few instructions and look for one that has a line
570           // number that's different than the first entry.
571           uint32_t last_line_entry_idx = first_line_entry_idx + 6;
572           for (uint32_t idx = first_line_entry_idx + 1;
573                idx < last_line_entry_idx; ++idx) {
574             LineEntry line_entry;
575             if (line_table->GetLineEntryAtIndex(idx, line_entry)) {
576               if (line_entry.line != first_line_entry.line) {
577                 prologue_end_file_addr =
578                     line_entry.range.GetBaseAddress().GetFileAddress();
579                 prologue_end_line_idx = idx;
580                 break;
581               }
582             }
583           }
584 
585           if (prologue_end_file_addr == LLDB_INVALID_ADDRESS) {
586             prologue_end_file_addr =
587                 first_line_entry.range.GetBaseAddress().GetFileAddress() +
588                 first_line_entry.range.GetByteSize();
589             prologue_end_line_idx = first_line_entry_idx;
590           }
591         }
592 
593         const addr_t func_start_file_addr =
594             m_range.GetBaseAddress().GetFileAddress();
595         const addr_t func_end_file_addr =
596             func_start_file_addr + m_range.GetByteSize();
597 
598         // Now calculate the offset to pass the subsequent line 0 entries.
599         uint32_t first_non_zero_line = prologue_end_line_idx;
600         while (true) {
601           LineEntry line_entry;
602           if (line_table->GetLineEntryAtIndex(first_non_zero_line,
603                                               line_entry)) {
604             if (line_entry.line != 0)
605               break;
606           }
607           if (line_entry.range.GetBaseAddress().GetFileAddress() >=
608               func_end_file_addr)
609             break;
610 
611           first_non_zero_line++;
612         }
613 
614         if (first_non_zero_line > prologue_end_line_idx) {
615           LineEntry first_non_zero_entry;
616           if (line_table->GetLineEntryAtIndex(first_non_zero_line,
617                                               first_non_zero_entry)) {
618             line_zero_end_file_addr =
619                 first_non_zero_entry.range.GetBaseAddress().GetFileAddress();
620           }
621         }
622 
623         // Verify that this prologue end file address in the function's address
624         // range just to be sure
625         if (func_start_file_addr < prologue_end_file_addr &&
626             prologue_end_file_addr < func_end_file_addr) {
627           m_prologue_byte_size = prologue_end_file_addr - func_start_file_addr;
628         }
629 
630         if (prologue_end_file_addr < line_zero_end_file_addr &&
631             line_zero_end_file_addr < func_end_file_addr) {
632           m_prologue_byte_size +=
633               line_zero_end_file_addr - prologue_end_file_addr;
634         }
635       }
636     }
637   }
638 
639   return m_prologue_byte_size;
640 }
641 
642 lldb::LanguageType Function::GetLanguage() const {
643   lldb::LanguageType lang = m_mangled.GuessLanguage();
644   if (lang != lldb::eLanguageTypeUnknown)
645     return lang;
646 
647   if (m_comp_unit)
648     return m_comp_unit->GetLanguage();
649 
650   return lldb::eLanguageTypeUnknown;
651 }
652 
653 ConstString Function::GetName() const {
654   return m_mangled.GetName();
655 }
656 
657 ConstString Function::GetNameNoArguments() const {
658   return m_mangled.GetName(Mangled::ePreferDemangledWithoutArguments);
659 }
660