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//===-- 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/Symbol/CompactUnwindInfo.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_mutex (),
m_eh_frame (nullptr),
m_compact_unwind (nullptr)
{
}
// 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;
Mutex::Locker locker(m_mutex);
if (m_initialized) // check again once we've acquired the lock
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);
}
sect = sl->FindSectionByType (eSectionTypeCompactUnwind, true);
if (sect.get())
{
m_compact_unwind = new CompactUnwindInfo(m_object_file, sect);
}
}
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();
Mutex::Locker locker(m_mutex);
// 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 == nullptr || !m_eh_frame->GetAddressRange (addr, range))
{
return no_unwind_found;
}
}
FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, range));
m_unwinds.insert (insert_pos, std::make_pair(range.GetBaseAddress().GetFileAddress(), func_unwinder_sp));
// StreamFile s(stdout, false);
// 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 == nullptr || !m_eh_frame->GetAddressRange (addr, range))
{
return no_unwind_found;
}
}
FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, range));
return func_unwinder_sp;
}
void
UnwindTable::Dump (Stream &s)
{
Mutex::Locker locker(m_mutex);
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;
}
CompactUnwindInfo *
UnwindTable::GetCompactUnwindInfo ()
{
Initialize();
return m_compact_unwind;
}
bool
UnwindTable::GetArchitecture (lldb_private::ArchSpec &arch)
{
return m_object_file.GetArchitecture (arch);
}
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