| //===-- Symbol.cpp --------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Symbol/Symbol.h" |
| |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/ModuleSpec.h" |
| #include "lldb/Core/Section.h" |
| #include "lldb/Symbol/Function.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Symbol/SymbolVendor.h" |
| #include "lldb/Symbol/Symtab.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Utility/Stream.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| Symbol::Symbol() |
| : SymbolContextScope(), m_type_data_resolved(false), m_is_synthetic(false), |
| m_is_debug(false), m_is_external(false), m_size_is_sibling(false), |
| m_size_is_synthesized(false), m_size_is_valid(false), |
| m_demangled_is_synthesized(false), m_contains_linker_annotations(false), |
| m_is_weak(false), m_type(eSymbolTypeInvalid), m_mangled(), |
| m_addr_range() {} |
| |
| Symbol::Symbol(uint32_t symID, llvm::StringRef name, SymbolType type, bool external, |
| bool is_debug, bool is_trampoline, bool is_artificial, |
| const lldb::SectionSP §ion_sp, addr_t offset, addr_t size, |
| bool size_is_valid, bool contains_linker_annotations, |
| uint32_t flags) |
| : SymbolContextScope(), m_uid(symID), m_type_data(0), |
| m_type_data_resolved(false), m_is_synthetic(is_artificial), |
| m_is_debug(is_debug), m_is_external(external), m_size_is_sibling(false), |
| m_size_is_synthesized(false), m_size_is_valid(size_is_valid || size > 0), |
| m_demangled_is_synthesized(false), |
| m_contains_linker_annotations(contains_linker_annotations), |
| m_is_weak(false), m_type(type), |
| m_mangled(name), |
| m_addr_range(section_sp, offset, size), m_flags(flags) {} |
| |
| Symbol::Symbol(uint32_t symID, const Mangled &mangled, SymbolType type, |
| bool external, bool is_debug, bool is_trampoline, |
| bool is_artificial, const AddressRange &range, |
| bool size_is_valid, bool contains_linker_annotations, |
| uint32_t flags) |
| : SymbolContextScope(), m_uid(symID), m_type_data(0), |
| m_type_data_resolved(false), m_is_synthetic(is_artificial), |
| m_is_debug(is_debug), m_is_external(external), m_size_is_sibling(false), |
| m_size_is_synthesized(false), |
| m_size_is_valid(size_is_valid || range.GetByteSize() > 0), |
| m_demangled_is_synthesized(false), |
| m_contains_linker_annotations(contains_linker_annotations), |
| m_is_weak(false), m_type(type), m_mangled(mangled), m_addr_range(range), |
| m_flags(flags) {} |
| |
| Symbol::Symbol(const Symbol &rhs) |
| : SymbolContextScope(rhs), m_uid(rhs.m_uid), m_type_data(rhs.m_type_data), |
| m_type_data_resolved(rhs.m_type_data_resolved), |
| m_is_synthetic(rhs.m_is_synthetic), m_is_debug(rhs.m_is_debug), |
| m_is_external(rhs.m_is_external), |
| m_size_is_sibling(rhs.m_size_is_sibling), m_size_is_synthesized(false), |
| m_size_is_valid(rhs.m_size_is_valid), |
| m_demangled_is_synthesized(rhs.m_demangled_is_synthesized), |
| m_contains_linker_annotations(rhs.m_contains_linker_annotations), |
| m_is_weak(rhs.m_is_weak), m_type(rhs.m_type), m_mangled(rhs.m_mangled), |
| m_addr_range(rhs.m_addr_range), m_flags(rhs.m_flags) {} |
| |
| const Symbol &Symbol::operator=(const Symbol &rhs) { |
| if (this != &rhs) { |
| SymbolContextScope::operator=(rhs); |
| m_uid = rhs.m_uid; |
| m_type_data = rhs.m_type_data; |
| m_type_data_resolved = rhs.m_type_data_resolved; |
| m_is_synthetic = rhs.m_is_synthetic; |
| m_is_debug = rhs.m_is_debug; |
| m_is_external = rhs.m_is_external; |
| m_size_is_sibling = rhs.m_size_is_sibling; |
| m_size_is_synthesized = rhs.m_size_is_sibling; |
| m_size_is_valid = rhs.m_size_is_valid; |
| m_demangled_is_synthesized = rhs.m_demangled_is_synthesized; |
| m_contains_linker_annotations = rhs.m_contains_linker_annotations; |
| m_is_weak = rhs.m_is_weak; |
| m_type = rhs.m_type; |
| m_mangled = rhs.m_mangled; |
| m_addr_range = rhs.m_addr_range; |
| m_flags = rhs.m_flags; |
| } |
| return *this; |
| } |
| |
| void Symbol::Clear() { |
| m_uid = UINT32_MAX; |
| m_mangled.Clear(); |
| m_type_data = 0; |
| m_type_data_resolved = false; |
| m_is_synthetic = false; |
| m_is_debug = false; |
| m_is_external = false; |
| m_size_is_sibling = false; |
| m_size_is_synthesized = false; |
| m_size_is_valid = false; |
| m_demangled_is_synthesized = false; |
| m_contains_linker_annotations = false; |
| m_is_weak = false; |
| m_type = eSymbolTypeInvalid; |
| m_flags = 0; |
| m_addr_range.Clear(); |
| } |
| |
| bool Symbol::ValueIsAddress() const { |
| return m_addr_range.GetBaseAddress().GetSection().get() != nullptr || |
| m_type == eSymbolTypeAbsolute; |
| } |
| |
| ConstString Symbol::GetDisplayName() const { |
| return GetMangled().GetDisplayDemangledName(); |
| } |
| |
| ConstString Symbol::GetReExportedSymbolName() const { |
| if (m_type == eSymbolTypeReExported) { |
| // For eSymbolTypeReExported, the "const char *" from a ConstString is used |
| // as the offset in the address range base address. We can then make this |
| // back into a string that is the re-exported name. |
| intptr_t str_ptr = m_addr_range.GetBaseAddress().GetOffset(); |
| if (str_ptr != 0) |
| return ConstString((const char *)str_ptr); |
| else |
| return GetName(); |
| } |
| return ConstString(); |
| } |
| |
| FileSpec Symbol::GetReExportedSymbolSharedLibrary() const { |
| if (m_type == eSymbolTypeReExported) { |
| // For eSymbolTypeReExported, the "const char *" from a ConstString is used |
| // as the offset in the address range base address. We can then make this |
| // back into a string that is the re-exported name. |
| intptr_t str_ptr = m_addr_range.GetByteSize(); |
| if (str_ptr != 0) |
| return FileSpec((const char *)str_ptr); |
| } |
| return FileSpec(); |
| } |
| |
| void Symbol::SetReExportedSymbolName(ConstString name) { |
| SetType(eSymbolTypeReExported); |
| // For eSymbolTypeReExported, the "const char *" from a ConstString is used |
| // as the offset in the address range base address. |
| m_addr_range.GetBaseAddress().SetOffset((uintptr_t)name.GetCString()); |
| } |
| |
| bool Symbol::SetReExportedSymbolSharedLibrary(const FileSpec &fspec) { |
| if (m_type == eSymbolTypeReExported) { |
| // For eSymbolTypeReExported, the "const char *" from a ConstString is used |
| // as the offset in the address range base address. |
| m_addr_range.SetByteSize( |
| (uintptr_t)ConstString(fspec.GetPath().c_str()).GetCString()); |
| return true; |
| } |
| return false; |
| } |
| |
| uint32_t Symbol::GetSiblingIndex() const { |
| return m_size_is_sibling ? m_addr_range.GetByteSize() : UINT32_MAX; |
| } |
| |
| bool Symbol::IsTrampoline() const { return m_type == eSymbolTypeTrampoline; } |
| |
| bool Symbol::IsIndirect() const { return m_type == eSymbolTypeResolver; } |
| |
| void Symbol::GetDescription(Stream *s, lldb::DescriptionLevel level, |
| Target *target) const { |
| s->Printf("id = {0x%8.8x}", m_uid); |
| |
| if (m_addr_range.GetBaseAddress().GetSection()) { |
| if (ValueIsAddress()) { |
| const lldb::addr_t byte_size = GetByteSize(); |
| if (byte_size > 0) { |
| s->PutCString(", range = "); |
| m_addr_range.Dump(s, target, Address::DumpStyleLoadAddress, |
| Address::DumpStyleFileAddress); |
| } else { |
| s->PutCString(", address = "); |
| m_addr_range.GetBaseAddress().Dump(s, target, |
| Address::DumpStyleLoadAddress, |
| Address::DumpStyleFileAddress); |
| } |
| } else |
| s->Printf(", value = 0x%16.16" PRIx64, |
| m_addr_range.GetBaseAddress().GetOffset()); |
| } else { |
| if (m_size_is_sibling) |
| s->Printf(", sibling = %5" PRIu64, |
| m_addr_range.GetBaseAddress().GetOffset()); |
| else |
| s->Printf(", value = 0x%16.16" PRIx64, |
| m_addr_range.GetBaseAddress().GetOffset()); |
| } |
| ConstString demangled = GetMangled().GetDemangledName(); |
| if (demangled) |
| s->Printf(", name=\"%s\"", demangled.AsCString()); |
| if (m_mangled.GetMangledName()) |
| s->Printf(", mangled=\"%s\"", m_mangled.GetMangledName().AsCString()); |
| } |
| |
| void Symbol::Dump(Stream *s, Target *target, uint32_t index, |
| Mangled::NamePreference name_preference) const { |
| s->Printf("[%5u] %6u %c%c%c %-15s ", index, GetID(), m_is_debug ? 'D' : ' ', |
| m_is_synthetic ? 'S' : ' ', m_is_external ? 'X' : ' ', |
| GetTypeAsString()); |
| |
| // Make sure the size of the symbol is up to date before dumping |
| GetByteSize(); |
| |
| ConstString name = GetMangled().GetName(name_preference); |
| if (ValueIsAddress()) { |
| if (!m_addr_range.GetBaseAddress().Dump(s, nullptr, |
| Address::DumpStyleFileAddress)) |
| s->Printf("%*s", 18, ""); |
| |
| s->PutChar(' '); |
| |
| if (!m_addr_range.GetBaseAddress().Dump(s, target, |
| Address::DumpStyleLoadAddress)) |
| s->Printf("%*s", 18, ""); |
| |
| const char *format = m_size_is_sibling ? " Sibling -> [%5llu] 0x%8.8x %s\n" |
| : " 0x%16.16" PRIx64 " 0x%8.8x %s\n"; |
| s->Printf(format, GetByteSize(), m_flags, name.AsCString("")); |
| } else if (m_type == eSymbolTypeReExported) { |
| s->Printf( |
| " 0x%8.8x %s", |
| m_flags, name.AsCString("")); |
| |
| ConstString reexport_name = GetReExportedSymbolName(); |
| intptr_t shlib = m_addr_range.GetByteSize(); |
| if (shlib) |
| s->Printf(" -> %s`%s\n", (const char *)shlib, reexport_name.GetCString()); |
| else |
| s->Printf(" -> %s\n", reexport_name.GetCString()); |
| } else { |
| const char *format = |
| m_size_is_sibling |
| ? "0x%16.16" PRIx64 |
| " Sibling -> [%5llu] 0x%8.8x %s\n" |
| : "0x%16.16" PRIx64 " 0x%16.16" PRIx64 |
| " 0x%8.8x %s\n"; |
| s->Printf(format, m_addr_range.GetBaseAddress().GetOffset(), GetByteSize(), |
| m_flags, name.AsCString("")); |
| } |
| } |
| |
| uint32_t Symbol::GetPrologueByteSize() { |
| if (m_type == eSymbolTypeCode || m_type == eSymbolTypeResolver) { |
| if (!m_type_data_resolved) { |
| m_type_data_resolved = true; |
| |
| const Address &base_address = m_addr_range.GetBaseAddress(); |
| Function *function = base_address.CalculateSymbolContextFunction(); |
| if (function) { |
| // Functions have line entries which can also potentially have end of |
| // prologue information. So if this symbol points to a function, use |
| // the prologue information from there. |
| m_type_data = function->GetPrologueByteSize(); |
| } else { |
| ModuleSP module_sp(base_address.GetModule()); |
| SymbolContext sc; |
| if (module_sp) { |
| uint32_t resolved_flags = module_sp->ResolveSymbolContextForAddress( |
| base_address, eSymbolContextLineEntry, sc); |
| if (resolved_flags & eSymbolContextLineEntry) { |
| // Default to the end of the first line entry. |
| m_type_data = sc.line_entry.range.GetByteSize(); |
| |
| // Set address for next line. |
| Address addr(base_address); |
| addr.Slide(m_type_data); |
| |
| // Check the first few instructions and look for one that has a |
| // line number that is different than the first entry. This is also |
| // done in Function::GetPrologueByteSize(). |
| uint16_t total_offset = m_type_data; |
| for (int idx = 0; idx < 6; ++idx) { |
| SymbolContext sc_temp; |
| resolved_flags = module_sp->ResolveSymbolContextForAddress( |
| addr, eSymbolContextLineEntry, sc_temp); |
| // Make sure we got line number information... |
| if (!(resolved_flags & eSymbolContextLineEntry)) |
| break; |
| |
| // If this line number is different than our first one, use it |
| // and we're done. |
| if (sc_temp.line_entry.line != sc.line_entry.line) { |
| m_type_data = total_offset; |
| break; |
| } |
| |
| // Slide addr up to the next line address. |
| addr.Slide(sc_temp.line_entry.range.GetByteSize()); |
| total_offset += sc_temp.line_entry.range.GetByteSize(); |
| // If we've gone too far, bail out. |
| if (total_offset >= m_addr_range.GetByteSize()) |
| break; |
| } |
| |
| // Sanity check - this may be a function in the middle of code that |
| // has debug information, but not for this symbol. So the line |
| // entries surrounding us won't lie inside our function. In that |
| // case, the line entry will be bigger than we are, so we do that |
| // quick check and if that is true, we just return 0. |
| if (m_type_data >= m_addr_range.GetByteSize()) |
| m_type_data = 0; |
| } else { |
| // TODO: expose something in Process to figure out the |
| // size of a function prologue. |
| m_type_data = 0; |
| } |
| } |
| } |
| } |
| return m_type_data; |
| } |
| return 0; |
| } |
| |
| bool Symbol::Compare(ConstString name, SymbolType type) const { |
| if (type == eSymbolTypeAny || m_type == type) { |
| const Mangled &mangled = GetMangled(); |
| return mangled.GetMangledName() == name || |
| mangled.GetDemangledName() == name; |
| } |
| return false; |
| } |
| |
| #define ENUM_TO_CSTRING(x) \ |
| case eSymbolType##x: \ |
| return #x; |
| |
| const char *Symbol::GetTypeAsString() const { |
| switch (m_type) { |
| ENUM_TO_CSTRING(Invalid); |
| ENUM_TO_CSTRING(Absolute); |
| ENUM_TO_CSTRING(Code); |
| ENUM_TO_CSTRING(Resolver); |
| ENUM_TO_CSTRING(Data); |
| ENUM_TO_CSTRING(Trampoline); |
| ENUM_TO_CSTRING(Runtime); |
| ENUM_TO_CSTRING(Exception); |
| ENUM_TO_CSTRING(SourceFile); |
| ENUM_TO_CSTRING(HeaderFile); |
| ENUM_TO_CSTRING(ObjectFile); |
| ENUM_TO_CSTRING(CommonBlock); |
| ENUM_TO_CSTRING(Block); |
| ENUM_TO_CSTRING(Local); |
| ENUM_TO_CSTRING(Param); |
| ENUM_TO_CSTRING(Variable); |
| ENUM_TO_CSTRING(VariableType); |
| ENUM_TO_CSTRING(LineEntry); |
| ENUM_TO_CSTRING(LineHeader); |
| ENUM_TO_CSTRING(ScopeBegin); |
| ENUM_TO_CSTRING(ScopeEnd); |
| ENUM_TO_CSTRING(Additional); |
| ENUM_TO_CSTRING(Compiler); |
| ENUM_TO_CSTRING(Instrumentation); |
| ENUM_TO_CSTRING(Undefined); |
| ENUM_TO_CSTRING(ObjCClass); |
| ENUM_TO_CSTRING(ObjCMetaClass); |
| ENUM_TO_CSTRING(ObjCIVar); |
| ENUM_TO_CSTRING(ReExported); |
| default: |
| break; |
| } |
| return "<unknown SymbolType>"; |
| } |
| |
| void Symbol::CalculateSymbolContext(SymbolContext *sc) { |
| // Symbols can reconstruct the symbol and the module in the symbol context |
| sc->symbol = this; |
| if (ValueIsAddress()) |
| sc->module_sp = GetAddressRef().GetModule(); |
| else |
| sc->module_sp.reset(); |
| } |
| |
| ModuleSP Symbol::CalculateSymbolContextModule() { |
| if (ValueIsAddress()) |
| return GetAddressRef().GetModule(); |
| return ModuleSP(); |
| } |
| |
| Symbol *Symbol::CalculateSymbolContextSymbol() { return this; } |
| |
| void Symbol::DumpSymbolContext(Stream *s) { |
| bool dumped_module = false; |
| if (ValueIsAddress()) { |
| ModuleSP module_sp(GetAddressRef().GetModule()); |
| if (module_sp) { |
| dumped_module = true; |
| module_sp->DumpSymbolContext(s); |
| } |
| } |
| if (dumped_module) |
| s->PutCString(", "); |
| |
| s->Printf("Symbol{0x%8.8x}", GetID()); |
| } |
| |
| lldb::addr_t Symbol::GetByteSize() const { return m_addr_range.GetByteSize(); } |
| |
| Symbol *Symbol::ResolveReExportedSymbolInModuleSpec( |
| Target &target, ConstString &reexport_name, ModuleSpec &module_spec, |
| ModuleList &seen_modules) const { |
| ModuleSP module_sp; |
| if (module_spec.GetFileSpec()) { |
| // Try searching for the module file spec first using the full path |
| module_sp = target.GetImages().FindFirstModule(module_spec); |
| if (!module_sp) { |
| // Next try and find the module by basename in case environment variables |
| // or other runtime trickery causes shared libraries to be loaded from |
| // alternate paths |
| module_spec.GetFileSpec().GetDirectory().Clear(); |
| module_sp = target.GetImages().FindFirstModule(module_spec); |
| } |
| } |
| |
| if (module_sp) { |
| // There should not be cycles in the reexport list, but we don't want to |
| // crash if there are so make sure we haven't seen this before: |
| if (!seen_modules.AppendIfNeeded(module_sp)) |
| return nullptr; |
| |
| lldb_private::SymbolContextList sc_list; |
| module_sp->FindSymbolsWithNameAndType(reexport_name, eSymbolTypeAny, |
| sc_list); |
| const size_t num_scs = sc_list.GetSize(); |
| if (num_scs > 0) { |
| for (size_t i = 0; i < num_scs; ++i) { |
| lldb_private::SymbolContext sc; |
| if (sc_list.GetContextAtIndex(i, sc)) { |
| if (sc.symbol->IsExternal()) |
| return sc.symbol; |
| } |
| } |
| } |
| // If we didn't find the symbol in this module, it may be because this |
| // module re-exports some whole other library. We have to search those as |
| // well: |
| seen_modules.Append(module_sp); |
| |
| FileSpecList reexported_libraries = |
| module_sp->GetObjectFile()->GetReExportedLibraries(); |
| size_t num_reexported_libraries = reexported_libraries.GetSize(); |
| for (size_t idx = 0; idx < num_reexported_libraries; idx++) { |
| ModuleSpec reexported_module_spec; |
| reexported_module_spec.GetFileSpec() = |
| reexported_libraries.GetFileSpecAtIndex(idx); |
| Symbol *result_symbol = ResolveReExportedSymbolInModuleSpec( |
| target, reexport_name, reexported_module_spec, seen_modules); |
| if (result_symbol) |
| return result_symbol; |
| } |
| } |
| return nullptr; |
| } |
| |
| Symbol *Symbol::ResolveReExportedSymbol(Target &target) const { |
| ConstString reexport_name(GetReExportedSymbolName()); |
| if (reexport_name) { |
| ModuleSpec module_spec; |
| ModuleList seen_modules; |
| module_spec.GetFileSpec() = GetReExportedSymbolSharedLibrary(); |
| if (module_spec.GetFileSpec()) { |
| return ResolveReExportedSymbolInModuleSpec(target, reexport_name, |
| module_spec, seen_modules); |
| } |
| } |
| return nullptr; |
| } |
| |
| lldb::addr_t Symbol::GetFileAddress() const { |
| if (ValueIsAddress()) |
| return GetAddressRef().GetFileAddress(); |
| else |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| lldb::addr_t Symbol::GetLoadAddress(Target *target) const { |
| if (ValueIsAddress()) |
| return GetAddressRef().GetLoadAddress(target); |
| else |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| ConstString Symbol::GetName() const { return GetMangled().GetName(); } |
| |
| ConstString Symbol::GetNameNoArguments() const { |
| return GetMangled().GetName(Mangled::ePreferDemangledWithoutArguments); |
| } |
| |
| lldb::addr_t Symbol::ResolveCallableAddress(Target &target) const { |
| if (GetType() == lldb::eSymbolTypeUndefined) |
| return LLDB_INVALID_ADDRESS; |
| |
| Address func_so_addr; |
| |
| bool is_indirect = IsIndirect(); |
| if (GetType() == eSymbolTypeReExported) { |
| Symbol *reexported_symbol = ResolveReExportedSymbol(target); |
| if (reexported_symbol) { |
| func_so_addr = reexported_symbol->GetAddress(); |
| is_indirect = reexported_symbol->IsIndirect(); |
| } |
| } else { |
| func_so_addr = GetAddress(); |
| is_indirect = IsIndirect(); |
| } |
| |
| if (func_so_addr.IsValid()) { |
| if (!target.GetProcessSP() && is_indirect) { |
| // can't resolve indirect symbols without calling a function... |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| lldb::addr_t load_addr = |
| func_so_addr.GetCallableLoadAddress(&target, is_indirect); |
| |
| if (load_addr != LLDB_INVALID_ADDRESS) { |
| return load_addr; |
| } |
| } |
| |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| lldb::DisassemblerSP Symbol::GetInstructions(const ExecutionContext &exe_ctx, |
| const char *flavor, |
| bool prefer_file_cache) { |
| ModuleSP module_sp(m_addr_range.GetBaseAddress().GetModule()); |
| if (module_sp && exe_ctx.HasTargetScope()) { |
| return Disassembler::DisassembleRange(module_sp->GetArchitecture(), nullptr, |
| flavor, exe_ctx.GetTargetRef(), |
| m_addr_range, !prefer_file_cache); |
| } |
| return lldb::DisassemblerSP(); |
| } |
| |
| bool Symbol::GetDisassembly(const ExecutionContext &exe_ctx, const char *flavor, |
| bool prefer_file_cache, Stream &strm) { |
| lldb::DisassemblerSP disassembler_sp = |
| GetInstructions(exe_ctx, flavor, prefer_file_cache); |
| if (disassembler_sp) { |
| const bool show_address = true; |
| const bool show_bytes = false; |
| disassembler_sp->GetInstructionList().Dump(&strm, show_address, show_bytes, |
| &exe_ctx); |
| return true; |
| } |
| return false; |
| } |
| |
| bool Symbol::ContainsFileAddress(lldb::addr_t file_addr) const { |
| return m_addr_range.ContainsFileAddress(file_addr); |
| } |
| |
| bool Symbol::IsSyntheticWithAutoGeneratedName() const { |
| if (!IsSynthetic()) |
| return false; |
| if (!m_mangled) |
| return true; |
| ConstString demangled = m_mangled.GetDemangledName(); |
| return demangled.GetStringRef().startswith(GetSyntheticSymbolPrefix()); |
| } |
| |
| void Symbol::SynthesizeNameIfNeeded() const { |
| if (m_is_synthetic && !m_mangled) { |
| // Synthetic symbol names don't mean anything, but they do uniquely |
| // identify individual symbols so we give them a unique name. The name |
| // starts with the synthetic symbol prefix, followed by a unique number. |
| // Typically the UserID of a real symbol is the symbol table index of the |
| // symbol in the object file's symbol table(s), so it will be the same |
| // every time you read in the object file. We want the same persistence for |
| // synthetic symbols so that users can identify them across multiple debug |
| // sessions, to understand crashes in those symbols and to reliably set |
| // breakpoints on them. |
| llvm::SmallString<256> name; |
| llvm::raw_svector_ostream os(name); |
| os << GetSyntheticSymbolPrefix() << GetID(); |
| m_mangled.SetDemangledName(ConstString(os.str())); |
| } |
| } |
