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//===-- FuncUnwinders.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/lldb-private.h"
#include "lldb/Symbol/FuncUnwinders.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Core/AddressRange.h"
#include "lldb/Core/Address.h"
#include "lldb/Symbol/UnwindTable.h"
#include "lldb/Utility/UnwindAssemblyProfiler.h"
#include "lldb/Utility/ArchDefaultUnwindPlan.h"
#include "lldb/Symbol/DWARFCallFrameInfo.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/Target.h"
using namespace lldb;
using namespace lldb_private;
FuncUnwinders::FuncUnwinders (UnwindTable& unwind_table, UnwindAssemblyProfiler *assembly_profiler, AddressRange range) :
m_unwind_table(unwind_table),
m_assembly_profiler(assembly_profiler),
m_range(range),
m_unwind_at_call_site(NULL),
m_unwind_at_non_call_site(NULL),
m_fast_unwind(NULL),
m_arch_default_unwind(NULL),
m_first_non_prologue_insn() { }
FuncUnwinders::~FuncUnwinders ()
{
if (m_unwind_at_call_site)
delete m_unwind_at_call_site;
if (m_unwind_at_non_call_site)
delete m_unwind_at_non_call_site;
if (m_fast_unwind)
delete m_fast_unwind;
if (m_arch_default_unwind)
delete m_arch_default_unwind;
}
UnwindPlan*
FuncUnwinders::GetUnwindPlanAtCallSite (int current_offset)
{
if (m_unwind_at_call_site != NULL)
return m_unwind_at_call_site;
if (!m_range.GetBaseAddress().IsValid())
return NULL;
// We have cases (e.g. with _sigtramp on Mac OS X) where the hand-written eh_frame unwind info for a
// function does not cover the entire range of the function and so the FDE only lists a subset of the
// address range. If we try to look up the unwind info by the starting address of the function
// (i.e. m_range.GetBaseAddress()) we may not find the eh_frame FDE. We need to use the actual byte offset
// into the function when looking it up.
Address current_pc (m_range.GetBaseAddress ());
if (current_offset != -1)
current_pc.SetOffset (current_pc.GetOffset() + current_offset);
DWARFCallFrameInfo *eh_frame = m_unwind_table.GetEHFrameInfo();
UnwindPlan *up = NULL;
if (eh_frame)
{
up = new UnwindPlan;
if (!eh_frame->GetUnwindPlan (current_pc, *up))
{
delete up;
return NULL;
}
}
if (!up)
return NULL;
m_unwind_at_call_site = up;
return m_unwind_at_call_site;
}
UnwindPlan*
FuncUnwinders::GetUnwindPlanAtNonCallSite (Thread& thread)
{
if (m_unwind_at_non_call_site != NULL)
return m_unwind_at_non_call_site;
UnwindPlan *up = new UnwindPlan;
if (!m_assembly_profiler->GetNonCallSiteUnwindPlanFromAssembly (m_range, thread, *up))
{
delete up;
return NULL;
}
m_unwind_at_non_call_site = up;
return m_unwind_at_non_call_site;
}
UnwindPlan*
FuncUnwinders::GetUnwindPlanFastUnwind (Thread& thread)
{
if (m_fast_unwind != NULL)
return m_fast_unwind;
UnwindPlan *up = new UnwindPlan;
if (!m_assembly_profiler->GetFastUnwindPlan (m_range, thread, *up))
{
delete up;
return NULL;
}
m_fast_unwind = up;
return m_fast_unwind;
}
UnwindPlan*
FuncUnwinders::GetUnwindPlanArchitectureDefault (Thread& thread)
{
if (m_arch_default_unwind != NULL)
return m_arch_default_unwind;
Address current_pc;
Target *target = thread.CalculateTarget();
if (target)
{
ArchSpec arch = target->GetArchitecture ();
ArchDefaultUnwindPlan *arch_default = ArchDefaultUnwindPlan::FindPlugin (arch);
if (arch_default)
{
m_arch_default_unwind = arch_default->GetArchDefaultUnwindPlan (thread, current_pc);
}
}
return m_arch_default_unwind;
}
Address&
FuncUnwinders::GetFirstNonPrologueInsn (Target& target)
{
if (m_first_non_prologue_insn.IsValid())
return m_first_non_prologue_insn;
m_assembly_profiler->FirstNonPrologueInsn (m_range, target, NULL, m_first_non_prologue_insn);
return m_first_non_prologue_insn;
}
const Address&
FuncUnwinders::GetFunctionStartAddress () const
{
return m_range.GetBaseAddress();
}
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