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