1 //===-- UnwindTable.cpp -----------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "lldb/Symbol/UnwindTable.h"
14 #include "lldb/Core/Module.h"
15 #include "lldb/Core/Section.h"
16 #include "lldb/Symbol/ArmUnwindInfo.h"
17 #include "lldb/Symbol/CompactUnwindInfo.h"
18 #include "lldb/Symbol/DWARFCallFrameInfo.h"
19 #include "lldb/Symbol/FuncUnwinders.h"
20 #include "lldb/Symbol/ObjectFile.h"
21 #include "lldb/Symbol/SymbolContext.h"
23 // There is one UnwindTable object per ObjectFile.
24 // It contains a list of Unwind objects -- one per function, populated lazily --
25 // for the ObjectFile.
26 // Each Unwind object has multiple UnwindPlans for different scenarios.
29 using namespace lldb_private;
31 UnwindTable::UnwindTable(ObjectFile &objfile)
32 : m_object_file(objfile), m_unwinds(), m_initialized(false), m_mutex(),
33 m_eh_frame_up(), m_compact_unwind_up(), m_arm_unwind_up() {}
35 // We can't do some of this initialization when the ObjectFile is running its
36 // ctor; delay doing it
37 // until needed for something.
39 void UnwindTable::Initialize() {
43 std::lock_guard<std::mutex> guard(m_mutex);
45 if (m_initialized) // check again once we've acquired the lock
49 SectionList *sl = m_object_file.GetSectionList();
53 SectionSP sect = sl->FindSectionByType(eSectionTypeEHFrame, true);
56 new DWARFCallFrameInfo(m_object_file, sect, DWARFCallFrameInfo::EH));
59 sect = sl->FindSectionByType(eSectionTypeDWARFDebugFrame, true);
61 m_debug_frame_up.reset(
62 new DWARFCallFrameInfo(m_object_file, sect, DWARFCallFrameInfo::DWARF));
65 sect = sl->FindSectionByType(eSectionTypeCompactUnwind, true);
67 m_compact_unwind_up.reset(new CompactUnwindInfo(m_object_file, sect));
70 sect = sl->FindSectionByType(eSectionTypeARMexidx, true);
72 SectionSP sect_extab = sl->FindSectionByType(eSectionTypeARMextab, true);
73 if (sect_extab.get()) {
74 m_arm_unwind_up.reset(new ArmUnwindInfo(m_object_file, sect, sect_extab));
79 UnwindTable::~UnwindTable() {}
81 llvm::Optional<AddressRange> UnwindTable::GetAddressRange(const Address &addr,
85 // First check the symbol context
86 if (sc.GetAddressRange(eSymbolContextFunction | eSymbolContextSymbol, 0,
88 range.GetBaseAddress().IsValid())
91 // Does the eh_frame unwind info has a function bounds for this addr?
92 if (m_eh_frame_up && m_eh_frame_up->GetAddressRange(addr, range))
95 // Try debug_frame as well
96 if (m_debug_frame_up && m_debug_frame_up->GetAddressRange(addr, range))
103 UnwindTable::GetFuncUnwindersContainingAddress(const Address &addr,
107 std::lock_guard<std::mutex> guard(m_mutex);
109 // There is an UnwindTable per object file, so we can safely use file handles
110 addr_t file_addr = addr.GetFileAddress();
111 iterator end = m_unwinds.end();
112 iterator insert_pos = end;
113 if (!m_unwinds.empty()) {
114 insert_pos = m_unwinds.lower_bound(file_addr);
115 iterator pos = insert_pos;
116 if ((pos == m_unwinds.end()) ||
117 (pos != m_unwinds.begin() &&
118 pos->second->GetFunctionStartAddress() != addr))
121 if (pos->second->ContainsAddress(addr))
125 auto range_or = GetAddressRange(addr, sc);
129 FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, *range_or));
130 m_unwinds.insert(insert_pos,
131 std::make_pair(range_or->GetBaseAddress().GetFileAddress(),
133 return func_unwinder_sp;
136 // Ignore any existing FuncUnwinders for this function, create a new one and
137 // don't add it to the
138 // UnwindTable. This is intended for use by target modules show-unwind where we
140 // new UnwindPlans, not re-use existing ones.
142 UnwindTable::GetUncachedFuncUnwindersContainingAddress(const Address &addr,
146 auto range_or = GetAddressRange(addr, sc);
150 return std::make_shared<FuncUnwinders>(*this, *range_or);
153 void UnwindTable::Dump(Stream &s) {
154 std::lock_guard<std::mutex> guard(m_mutex);
155 s.Printf("UnwindTable for '%s':\n",
156 m_object_file.GetFileSpec().GetPath().c_str());
157 const_iterator begin = m_unwinds.begin();
158 const_iterator end = m_unwinds.end();
159 for (const_iterator pos = begin; pos != end; ++pos) {
160 s.Printf("[%u] 0x%16.16" PRIx64 "\n", (unsigned)std::distance(begin, pos),
166 DWARFCallFrameInfo *UnwindTable::GetEHFrameInfo() {
168 return m_eh_frame_up.get();
171 DWARFCallFrameInfo *UnwindTable::GetDebugFrameInfo() {
173 return m_debug_frame_up.get();
176 CompactUnwindInfo *UnwindTable::GetCompactUnwindInfo() {
178 return m_compact_unwind_up.get();
181 ArmUnwindInfo *UnwindTable::GetArmUnwindInfo() {
183 return m_arm_unwind_up.get();
186 bool UnwindTable::GetArchitecture(lldb_private::ArchSpec &arch) {
187 return m_object_file.GetArchitecture(arch);
190 bool UnwindTable::GetAllowAssemblyEmulationUnwindPlans() {
191 return m_object_file.AllowAssemblyEmulationUnwindPlans();