xref: /openbsd/gnu/llvm/lldb/source/Symbol/Function.cpp (revision f6aab3d8)
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.
FunctionInfo(const char * name,const Declaration * decl_ptr)31 FunctionInfo::FunctionInfo(const char *name, const Declaration *decl_ptr)
32     : m_name(name), m_declaration(decl_ptr) {}
33 
FunctionInfo(ConstString name,const Declaration * decl_ptr)34 FunctionInfo::FunctionInfo(ConstString name, const Declaration *decl_ptr)
35     : m_name(name), m_declaration(decl_ptr) {}
36 
37 FunctionInfo::~FunctionInfo() = default;
38 
Dump(Stream * s,bool show_fullpaths) const39 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 
Compare(const FunctionInfo & a,const FunctionInfo & b)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 
GetDeclaration()53 Declaration &FunctionInfo::GetDeclaration() { return m_declaration; }
54 
GetDeclaration() const55 const Declaration &FunctionInfo::GetDeclaration() const {
56   return m_declaration;
57 }
58 
GetName() const59 ConstString FunctionInfo::GetName() const { return m_name; }
60 
MemorySize() const61 size_t FunctionInfo::MemorySize() const {
62   return m_name.MemorySize() + m_declaration.MemorySize();
63 }
64 
InlineFunctionInfo(const char * name,llvm::StringRef mangled,const Declaration * decl_ptr,const Declaration * call_decl_ptr)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 
InlineFunctionInfo(ConstString name,const Mangled & mangled,const Declaration * decl_ptr,const Declaration * call_decl_ptr)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 
Dump(Stream * s,bool show_fullpaths) const81 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 
DumpStopContext(Stream * s) const87 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 
GetName() const96 ConstString InlineFunctionInfo::GetName() const {
97   if (m_mangled)
98     return m_mangled.GetName();
99   return m_name;
100 }
101 
GetDisplayName() const102 ConstString InlineFunctionInfo::GetDisplayName() const {
103   if (m_mangled)
104     return m_mangled.GetDisplayDemangledName();
105   return m_name;
106 }
107 
GetCallSite()108 Declaration &InlineFunctionInfo::GetCallSite() { return m_call_decl; }
109 
GetCallSite() const110 const Declaration &InlineFunctionInfo::GetCallSite() const {
111   return m_call_decl;
112 }
113 
GetMangled()114 Mangled &InlineFunctionInfo::GetMangled() { return m_mangled; }
115 
GetMangled() const116 const Mangled &InlineFunctionInfo::GetMangled() const { return m_mangled; }
117 
MemorySize() const118 size_t InlineFunctionInfo::MemorySize() const {
119   return FunctionInfo::MemorySize() + m_mangled.MemorySize();
120 }
121 
122 /// @name Call site related structures
123 /// @{
124 
GetLoadAddress(lldb::addr_t unresolved_pc,Function & caller,Target & target)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 
GetReturnPCAddress(Function & caller,Target & target) const148 lldb::addr_t CallEdge::GetReturnPCAddress(Function &caller,
149                                           Target &target) const {
150   return GetLoadAddress(GetUnresolvedReturnPCAddress(), caller, target);
151 }
152 
ParseSymbolFileAndResolve(ModuleList & images)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 
GetCallee(ModuleList & images,ExecutionContext &)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 
GetCallee(ModuleList & images,ExecutionContext & exe_ctx)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(
200           &exe_ctx, exe_ctx.GetRegisterContext(), LLDB_INVALID_ADDRESS,
201           /*initial_value_ptr=*/nullptr,
202           /*object_address_ptr=*/nullptr, callee_addr_val, &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 //
Function(CompileUnit * comp_unit,lldb::user_id_t func_uid,lldb::user_id_t type_uid,const Mangled & mangled,Type * type,const AddressRange & range)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 
GetStartLineSourceInfo(FileSpec & source_file,uint32_t & line_no)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 
GetEndLineSourceInfo(FileSpec & source_file,uint32_t & line_no)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 
GetCallEdges()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 std::nullopt;
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 
GetTailCallingEdges()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 
GetCallEdgeForReturnAddress(addr_t return_pc,Target & target)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 
GetBlock(bool can_create)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 
GetCompileUnit()360 CompileUnit *Function::GetCompileUnit() { return m_comp_unit; }
361 
GetCompileUnit() const362 const CompileUnit *Function::GetCompileUnit() const { return m_comp_unit; }
363 
GetDescription(Stream * s,lldb::DescriptionLevel level,Target * target)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 
Dump(Stream * s,bool show_context) const384 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 
CalculateSymbolContext(SymbolContext * sc)403 void Function::CalculateSymbolContext(SymbolContext *sc) {
404   sc->function = this;
405   m_comp_unit->CalculateSymbolContext(sc);
406 }
407 
CalculateSymbolContextModule()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 
CalculateSymbolContextCompileUnit()416 CompileUnit *Function::CalculateSymbolContextCompileUnit() {
417   return this->GetCompileUnit();
418 }
419 
CalculateSymbolContextFunction()420 Function *Function::CalculateSymbolContextFunction() { return this; }
421 
GetInstructions(const ExecutionContext & exe_ctx,const char * flavor,bool prefer_file_cache)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 
GetDisassembly(const ExecutionContext & exe_ctx,const char * flavor,Stream & strm,bool prefer_file_cache)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     const bool show_control_flow_kind = false;
443     disassembler_sp->GetInstructionList().Dump(
444         &strm, show_address, show_bytes, show_control_flow_kind, &exe_ctx);
445     return true;
446   }
447   return false;
448 }
449 
450 // Symbol *
451 // Function::CalculateSymbolContextSymbol ()
452 //{
453 //    return // TODO: find the symbol for the function???
454 //}
455 
DumpSymbolContext(Stream * s)456 void Function::DumpSymbolContext(Stream *s) {
457   m_comp_unit->DumpSymbolContext(s);
458   s->Printf(", Function{0x%8.8" PRIx64 "}", GetID());
459 }
460 
MemorySize() const461 size_t Function::MemorySize() const {
462   size_t mem_size = sizeof(Function) + m_block.MemorySize();
463   return mem_size;
464 }
465 
GetIsOptimized()466 bool Function::GetIsOptimized() {
467   bool result = false;
468 
469   // Currently optimization is only indicted by the vendor extension
470   // DW_AT_APPLE_optimized which is set on a compile unit level.
471   if (m_comp_unit) {
472     result = m_comp_unit->GetIsOptimized();
473   }
474   return result;
475 }
476 
IsTopLevelFunction()477 bool Function::IsTopLevelFunction() {
478   bool result = false;
479 
480   if (Language *language = Language::FindPlugin(GetLanguage()))
481     result = language->IsTopLevelFunction(*this);
482 
483   return result;
484 }
485 
GetDisplayName() const486 ConstString Function::GetDisplayName() const {
487   return m_mangled.GetDisplayDemangledName();
488 }
489 
GetDeclContext()490 CompilerDeclContext Function::GetDeclContext() {
491   ModuleSP module_sp = CalculateSymbolContextModule();
492 
493   if (module_sp) {
494     if (SymbolFile *sym_file = module_sp->GetSymbolFile())
495       return sym_file->GetDeclContextForUID(GetID());
496   }
497   return CompilerDeclContext();
498 }
499 
GetType()500 Type *Function::GetType() {
501   if (m_type == nullptr) {
502     SymbolContext sc;
503 
504     CalculateSymbolContext(&sc);
505 
506     if (!sc.module_sp)
507       return nullptr;
508 
509     SymbolFile *sym_file = sc.module_sp->GetSymbolFile();
510 
511     if (sym_file == nullptr)
512       return nullptr;
513 
514     m_type = sym_file->ResolveTypeUID(m_type_uid);
515   }
516   return m_type;
517 }
518 
GetType() const519 const Type *Function::GetType() const { return m_type; }
520 
GetCompilerType()521 CompilerType Function::GetCompilerType() {
522   Type *function_type = GetType();
523   if (function_type)
524     return function_type->GetFullCompilerType();
525   return CompilerType();
526 }
527 
GetPrologueByteSize()528 uint32_t Function::GetPrologueByteSize() {
529   if (m_prologue_byte_size == 0 &&
530       m_flags.IsClear(flagsCalculatedPrologueSize)) {
531     m_flags.Set(flagsCalculatedPrologueSize);
532     LineTable *line_table = m_comp_unit->GetLineTable();
533     uint32_t prologue_end_line_idx = 0;
534 
535     if (line_table) {
536       LineEntry first_line_entry;
537       uint32_t first_line_entry_idx = UINT32_MAX;
538       if (line_table->FindLineEntryByAddress(GetAddressRange().GetBaseAddress(),
539                                              first_line_entry,
540                                              &first_line_entry_idx)) {
541         // Make sure the first line entry isn't already the end of the prologue
542         addr_t prologue_end_file_addr = LLDB_INVALID_ADDRESS;
543         addr_t line_zero_end_file_addr = LLDB_INVALID_ADDRESS;
544 
545         if (first_line_entry.is_prologue_end) {
546           prologue_end_file_addr =
547               first_line_entry.range.GetBaseAddress().GetFileAddress();
548           prologue_end_line_idx = first_line_entry_idx;
549         } else {
550           // Check the first few instructions and look for one that has
551           // is_prologue_end set to true.
552           const uint32_t last_line_entry_idx = first_line_entry_idx + 6;
553           for (uint32_t idx = first_line_entry_idx + 1;
554                idx < last_line_entry_idx; ++idx) {
555             LineEntry line_entry;
556             if (line_table->GetLineEntryAtIndex(idx, line_entry)) {
557               if (line_entry.is_prologue_end) {
558                 prologue_end_file_addr =
559                     line_entry.range.GetBaseAddress().GetFileAddress();
560                 prologue_end_line_idx = idx;
561                 break;
562               }
563             }
564           }
565         }
566 
567         // If we didn't find the end of the prologue in the line tables, then
568         // just use the end address of the first line table entry
569         if (prologue_end_file_addr == LLDB_INVALID_ADDRESS) {
570           // Check the first few instructions and look for one that has a line
571           // number that's different than the first entry.
572           uint32_t last_line_entry_idx = first_line_entry_idx + 6;
573           for (uint32_t idx = first_line_entry_idx + 1;
574                idx < last_line_entry_idx; ++idx) {
575             LineEntry line_entry;
576             if (line_table->GetLineEntryAtIndex(idx, line_entry)) {
577               if (line_entry.line != first_line_entry.line) {
578                 prologue_end_file_addr =
579                     line_entry.range.GetBaseAddress().GetFileAddress();
580                 prologue_end_line_idx = idx;
581                 break;
582               }
583             }
584           }
585 
586           if (prologue_end_file_addr == LLDB_INVALID_ADDRESS) {
587             prologue_end_file_addr =
588                 first_line_entry.range.GetBaseAddress().GetFileAddress() +
589                 first_line_entry.range.GetByteSize();
590             prologue_end_line_idx = first_line_entry_idx;
591           }
592         }
593 
594         const addr_t func_start_file_addr =
595             m_range.GetBaseAddress().GetFileAddress();
596         const addr_t func_end_file_addr =
597             func_start_file_addr + m_range.GetByteSize();
598 
599         // Now calculate the offset to pass the subsequent line 0 entries.
600         uint32_t first_non_zero_line = prologue_end_line_idx;
601         while (true) {
602           LineEntry line_entry;
603           if (line_table->GetLineEntryAtIndex(first_non_zero_line,
604                                               line_entry)) {
605             if (line_entry.line != 0)
606               break;
607           }
608           if (line_entry.range.GetBaseAddress().GetFileAddress() >=
609               func_end_file_addr)
610             break;
611 
612           first_non_zero_line++;
613         }
614 
615         if (first_non_zero_line > prologue_end_line_idx) {
616           LineEntry first_non_zero_entry;
617           if (line_table->GetLineEntryAtIndex(first_non_zero_line,
618                                               first_non_zero_entry)) {
619             line_zero_end_file_addr =
620                 first_non_zero_entry.range.GetBaseAddress().GetFileAddress();
621           }
622         }
623 
624         // Verify that this prologue end file address in the function's address
625         // range just to be sure
626         if (func_start_file_addr < prologue_end_file_addr &&
627             prologue_end_file_addr < func_end_file_addr) {
628           m_prologue_byte_size = prologue_end_file_addr - func_start_file_addr;
629         }
630 
631         if (prologue_end_file_addr < line_zero_end_file_addr &&
632             line_zero_end_file_addr < func_end_file_addr) {
633           m_prologue_byte_size +=
634               line_zero_end_file_addr - prologue_end_file_addr;
635         }
636       }
637     }
638   }
639 
640   return m_prologue_byte_size;
641 }
642 
GetLanguage() const643 lldb::LanguageType Function::GetLanguage() const {
644   lldb::LanguageType lang = m_mangled.GuessLanguage();
645   if (lang != lldb::eLanguageTypeUnknown)
646     return lang;
647 
648   if (m_comp_unit)
649     return m_comp_unit->GetLanguage();
650 
651   return lldb::eLanguageTypeUnknown;
652 }
653 
GetName() const654 ConstString Function::GetName() const {
655   return m_mangled.GetName();
656 }
657 
GetNameNoArguments() const658 ConstString Function::GetNameNoArguments() const {
659   return m_mangled.GetName(Mangled::ePreferDemangledWithoutArguments);
660 }
661