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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/Core/AddressRange.h"
#include "lldb/Core/Address.h"
#include "lldb/Symbol/FuncUnwinders.h"
#include "lldb/Symbol/DWARFCallFrameInfo.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Symbol/UnwindTable.h"
#include "lldb/Target/ABI.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/UnwindAssembly.h"
using namespace lldb;
using namespace lldb_private;
FuncUnwinders::FuncUnwinders (UnwindTable& unwind_table, AddressRange range) :
m_unwind_table (unwind_table),
m_range (range),
m_mutex (Mutex::eMutexTypeRecursive),
m_unwind_plan_call_site_sp (),
m_unwind_plan_non_call_site_sp (),
m_unwind_plan_fast_sp (),
m_unwind_plan_arch_default_sp (),
m_tried_unwind_at_call_site (false),
m_tried_unwind_at_non_call_site (false),
m_tried_unwind_fast (false),
m_tried_unwind_arch_default (false),
m_tried_unwind_arch_default_at_func_entry (false),
m_first_non_prologue_insn ()
{
}
FuncUnwinders::~FuncUnwinders ()
{
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanAtCallSite (int current_offset)
{
Mutex::Locker locker (m_mutex);
if (m_tried_unwind_at_call_site == false && m_unwind_plan_call_site_sp.get() == nullptr)
{
m_tried_unwind_at_call_site = true;
// 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.
if (m_range.GetBaseAddress().IsValid())
{
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();
if (eh_frame)
{
m_unwind_plan_call_site_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (!eh_frame->GetUnwindPlan (current_pc, *m_unwind_plan_call_site_sp))
m_unwind_plan_call_site_sp.reset();
}
}
}
return m_unwind_plan_call_site_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanAtNonCallSite (Target& target, Thread& thread, int current_offset)
{
Mutex::Locker locker (m_mutex);
if (m_tried_unwind_at_non_call_site == false && m_unwind_plan_non_call_site_sp.get() == nullptr)
{
UnwindAssemblySP assembly_profiler_sp (GetUnwindAssemblyProfiler());
if (assembly_profiler_sp)
{
if (target.GetArchitecture().GetCore() == ArchSpec::eCore_x86_32_i386
|| target.GetArchitecture().GetCore() == ArchSpec::eCore_x86_64_x86_64
|| target.GetArchitecture().GetCore() == ArchSpec::eCore_x86_64_x86_64h)
{
// For 0th frame on i386 & x86_64, we fetch eh_frame and try using assembly profiler
// to augment it into asynchronous unwind table.
GetUnwindPlanAtCallSite(current_offset);
if (m_unwind_plan_call_site_sp)
{
UnwindPlan* plan = new UnwindPlan (*m_unwind_plan_call_site_sp);
if (assembly_profiler_sp->AugmentUnwindPlanFromCallSite (m_range, thread, *plan))
{
m_unwind_plan_non_call_site_sp.reset (plan);
return m_unwind_plan_non_call_site_sp;
}
}
}
m_unwind_plan_non_call_site_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (!assembly_profiler_sp->GetNonCallSiteUnwindPlanFromAssembly (m_range, thread, *m_unwind_plan_non_call_site_sp))
m_unwind_plan_non_call_site_sp.reset();
}
}
return m_unwind_plan_non_call_site_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanFastUnwind (Thread& thread)
{
Mutex::Locker locker (m_mutex);
if (m_tried_unwind_fast == false && m_unwind_plan_fast_sp.get() == nullptr)
{
m_tried_unwind_fast = true;
UnwindAssemblySP assembly_profiler_sp (GetUnwindAssemblyProfiler());
if (assembly_profiler_sp)
{
m_unwind_plan_fast_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (!assembly_profiler_sp->GetFastUnwindPlan (m_range, thread, *m_unwind_plan_fast_sp))
m_unwind_plan_fast_sp.reset();
}
}
return m_unwind_plan_fast_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanArchitectureDefault (Thread& thread)
{
Mutex::Locker locker (m_mutex);
if (m_tried_unwind_arch_default == false && m_unwind_plan_arch_default_sp.get() == nullptr)
{
m_tried_unwind_arch_default = true;
Address current_pc;
ProcessSP process_sp (thread.CalculateProcess());
if (process_sp)
{
ABI *abi = process_sp->GetABI().get();
if (abi)
{
m_unwind_plan_arch_default_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (m_unwind_plan_arch_default_sp)
abi->CreateDefaultUnwindPlan(*m_unwind_plan_arch_default_sp);
}
}
}
return m_unwind_plan_arch_default_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry (Thread& thread)
{
Mutex::Locker locker (m_mutex);
if (m_tried_unwind_arch_default_at_func_entry == false
&& m_unwind_plan_arch_default_at_func_entry_sp.get() == nullptr)
{
m_tried_unwind_arch_default_at_func_entry = true;
Address current_pc;
ProcessSP process_sp (thread.CalculateProcess());
if (process_sp)
{
ABI *abi = process_sp->GetABI().get();
if (abi)
{
m_unwind_plan_arch_default_at_func_entry_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (m_unwind_plan_arch_default_at_func_entry_sp)
abi->CreateFunctionEntryUnwindPlan(*m_unwind_plan_arch_default_at_func_entry_sp);
}
}
}
return m_unwind_plan_arch_default_at_func_entry_sp;
}
Address&
FuncUnwinders::GetFirstNonPrologueInsn (Target& target)
{
if (m_first_non_prologue_insn.IsValid())
return m_first_non_prologue_insn;
ExecutionContext exe_ctx (target.shared_from_this(), false);
UnwindAssemblySP assembly_profiler_sp (GetUnwindAssemblyProfiler());
if (assembly_profiler_sp)
assembly_profiler_sp->FirstNonPrologueInsn (m_range, exe_ctx, m_first_non_prologue_insn);
return m_first_non_prologue_insn;
}
const Address&
FuncUnwinders::GetFunctionStartAddress () const
{
return m_range.GetBaseAddress();
}
lldb::UnwindAssemblySP
FuncUnwinders::GetUnwindAssemblyProfiler ()
{
UnwindAssemblySP assembly_profiler_sp;
ArchSpec arch;
if (m_unwind_table.GetArchitecture (arch))
{
assembly_profiler_sp = UnwindAssembly::FindPlugin (arch);
}
return assembly_profiler_sp;
}
Address
FuncUnwinders::GetLSDAAddress () const
{
Address lsda_addr;
if (m_unwind_plan_non_call_site_sp->GetLSDAAddress().IsValid())
{
lsda_addr = m_unwind_plan_non_call_site_sp->GetLSDAAddress().IsValid();
}
else if (m_unwind_plan_call_site_sp->GetLSDAAddress().IsValid())
{
lsda_addr = m_unwind_plan_non_call_site_sp->GetLSDAAddress().IsValid();
}
return lsda_addr;
}
Address
FuncUnwinders::GetPersonalityRoutinePtrAddress () const
{
Address personality_addr;
if (m_unwind_plan_non_call_site_sp->GetPersonalityFunctionPtr().IsValid())
{
personality_addr = m_unwind_plan_non_call_site_sp->GetPersonalityFunctionPtr().IsValid();
}
else if (m_unwind_plan_call_site_sp->GetPersonalityFunctionPtr().IsValid())
{
personality_addr = m_unwind_plan_non_call_site_sp->GetPersonalityFunctionPtr().IsValid();
}
return personality_addr;
}
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