| //===-- UnwindTable.cpp -----------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Symbol/UnwindTable.h" |
| |
| #include <stdio.h> |
| |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/Section.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Symbol/FuncUnwinders.h" |
| #include "lldb/Symbol/SymbolContext.h" |
| #include "lldb/Symbol/DWARFCallFrameInfo.h" |
| #include "lldb/Target/UnwindAssembly.h" |
| |
| // There is one UnwindTable object per ObjectFile. |
| // It contains a list of Unwind objects -- one per function, populated lazily -- for the ObjectFile. |
| // Each Unwind object has multiple UnwindPlans for different scenarios. |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| UnwindTable::UnwindTable (ObjectFile& objfile) : |
| m_object_file (objfile), |
| m_unwinds (), |
| m_initialized (false), |
| m_assembly_profiler (NULL), |
| m_eh_frame (NULL) |
| { |
| } |
| |
| // We can't do some of this initialization when the ObjectFile is running its ctor; delay doing it |
| // until needed for something. |
| |
| void |
| UnwindTable::Initialize () |
| { |
| if (m_initialized) |
| return; |
| |
| SectionList* sl = m_object_file.GetSectionList (); |
| if (sl) |
| { |
| SectionSP sect = sl->FindSectionByType (eSectionTypeEHFrame, true); |
| if (sect.get()) |
| { |
| m_eh_frame = new DWARFCallFrameInfo(m_object_file, sect, eRegisterKindGCC, true); |
| } |
| } |
| |
| ArchSpec arch; |
| if (m_object_file.GetArchitecture (arch)) |
| { |
| m_assembly_profiler = UnwindAssembly::FindPlugin (arch); |
| m_initialized = true; |
| } |
| } |
| |
| UnwindTable::~UnwindTable () |
| { |
| if (m_eh_frame) |
| delete m_eh_frame; |
| } |
| |
| FuncUnwindersSP |
| UnwindTable::GetFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc) |
| { |
| FuncUnwindersSP no_unwind_found; |
| |
| Initialize(); |
| |
| // There is an UnwindTable per object file, so we can safely use file handles |
| addr_t file_addr = addr.GetFileAddress(); |
| iterator end = m_unwinds.end (); |
| iterator insert_pos = end; |
| if (!m_unwinds.empty()) |
| { |
| insert_pos = m_unwinds.lower_bound (file_addr); |
| iterator pos = insert_pos; |
| if ((pos == m_unwinds.end ()) || (pos != m_unwinds.begin() && pos->second->GetFunctionStartAddress() != addr)) |
| --pos; |
| |
| if (pos->second->ContainsAddress (addr)) |
| return pos->second; |
| } |
| |
| AddressRange range; |
| if (!sc.GetAddressRange(eSymbolContextFunction | eSymbolContextSymbol, 0, false, range) || !range.GetBaseAddress().IsValid()) |
| { |
| // Does the eh_frame unwind info has a function bounds for this addr? |
| if (m_eh_frame == NULL || !m_eh_frame->GetAddressRange (addr, range)) |
| { |
| return no_unwind_found; |
| } |
| } |
| |
| FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, m_assembly_profiler, range)); |
| m_unwinds.insert (insert_pos, std::make_pair(range.GetBaseAddress().GetFileAddress(), func_unwinder_sp)); |
| // StreamFile s(stdout); |
| // Dump (s); |
| return func_unwinder_sp; |
| } |
| |
| // Ignore any existing FuncUnwinders for this function, create a new one and don't add it to the |
| // UnwindTable. This is intended for use by target modules show-unwind where we want to create |
| // new UnwindPlans, not re-use existing ones. |
| |
| FuncUnwindersSP |
| UnwindTable::GetUncachedFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc) |
| { |
| FuncUnwindersSP no_unwind_found; |
| Initialize(); |
| |
| AddressRange range; |
| if (!sc.GetAddressRange(eSymbolContextFunction | eSymbolContextSymbol, 0, false, range) || !range.GetBaseAddress().IsValid()) |
| { |
| // Does the eh_frame unwind info has a function bounds for this addr? |
| if (m_eh_frame == NULL || !m_eh_frame->GetAddressRange (addr, range)) |
| { |
| return no_unwind_found; |
| } |
| } |
| |
| FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, m_assembly_profiler, range)); |
| return func_unwinder_sp; |
| } |
| |
| |
| void |
| UnwindTable::Dump (Stream &s) |
| { |
| s.Printf("UnwindTable for '%s':\n", m_object_file.GetFileSpec().GetPath().c_str()); |
| const_iterator begin = m_unwinds.begin(); |
| const_iterator end = m_unwinds.end(); |
| for (const_iterator pos = begin; pos != end; ++pos) |
| { |
| s.Printf ("[%u] 0x%16.16" PRIx64 "\n", (unsigned)std::distance (begin, pos), pos->first); |
| } |
| s.EOL(); |
| } |
| |
| DWARFCallFrameInfo * |
| UnwindTable::GetEHFrameInfo () |
| { |
| Initialize(); |
| return m_eh_frame; |
| } |