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llvm-project/lldb/source/Symbol/FuncUnwinders.cpp

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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/CompactUnwindInfo.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;
//------------------------------------------------
/// constructor
//------------------------------------------------
FuncUnwinders::FuncUnwinders (UnwindTable& unwind_table, AddressRange range) :
m_unwind_table (unwind_table),
m_range (range),
m_mutex (Mutex::eMutexTypeRecursive),
m_unwind_plan_assembly_sp (),
m_unwind_plan_eh_frame_sp (),
m_unwind_plan_eh_frame_augmented_sp (),
m_unwind_plan_compact_unwind (),
m_unwind_plan_fast_sp (),
m_unwind_plan_arch_default_sp (),
m_unwind_plan_arch_default_at_func_entry_sp (),
m_tried_unwind_plan_assembly (false),
m_tried_unwind_plan_eh_frame (false),
m_tried_unwind_plan_eh_frame_augmented (false),
m_tried_unwind_plan_compact_unwind (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 ()
{
}
//------------------------------------------------
/// destructor
//------------------------------------------------
FuncUnwinders::~FuncUnwinders ()
{
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanAtCallSite (Target &target, int current_offset)
{
Mutex::Locker locker (m_mutex);
UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan (target, current_offset);
if (unwind_plan_sp.get() == nullptr)
{
unwind_plan_sp = GetCompactUnwindUnwindPlan (target, current_offset);
}
return unwind_plan_sp;
}
UnwindPlanSP
FuncUnwinders::GetCompactUnwindUnwindPlan (Target &target, int current_offset)
{
if (m_unwind_plan_compact_unwind.size() > 0)
return m_unwind_plan_compact_unwind[0]; // FIXME support multiple compact unwind plans for one func
if (m_tried_unwind_plan_compact_unwind)
return UnwindPlanSP();
Mutex::Locker lock (m_mutex);
m_tried_unwind_plan_compact_unwind = true;
if (m_range.GetBaseAddress().IsValid())
{
Address current_pc (m_range.GetBaseAddress ());
if (current_offset != -1)
current_pc.SetOffset (current_pc.GetOffset() + current_offset);
CompactUnwindInfo *compact_unwind = m_unwind_table.GetCompactUnwindInfo();
if (compact_unwind)
{
UnwindPlanSP unwind_plan_sp (new UnwindPlan (lldb::eRegisterKindGeneric));
if (compact_unwind->GetUnwindPlan (target, current_pc, *unwind_plan_sp))
{
m_unwind_plan_compact_unwind.push_back (unwind_plan_sp);
return m_unwind_plan_compact_unwind[0]; // FIXME support multiple compact unwind plans for one func
}
}
}
return UnwindPlanSP();
}
UnwindPlanSP
FuncUnwinders::GetEHFrameUnwindPlan (Target &target, int current_offset)
{
if (m_unwind_plan_eh_frame_sp.get() || m_tried_unwind_plan_eh_frame)
return m_unwind_plan_eh_frame_sp;
Mutex::Locker lock (m_mutex);
m_tried_unwind_plan_eh_frame = true;
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_eh_frame_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (!eh_frame->GetUnwindPlan (current_pc, *m_unwind_plan_eh_frame_sp))
m_unwind_plan_eh_frame_sp.reset();
}
}
return m_unwind_plan_eh_frame_sp;
}
UnwindPlanSP
FuncUnwinders::GetEHFrameAugmentedUnwindPlan (Target &target, Thread &thread, int current_offset)
{
if (m_unwind_plan_eh_frame_augmented_sp.get() || m_tried_unwind_plan_eh_frame_augmented)
return m_unwind_plan_eh_frame_augmented_sp;
// Only supported on x86 architectures where we get eh_frame from the compiler that describes
// the prologue instructions perfectly, and sometimes the epilogue instructions too.
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)
{
m_tried_unwind_plan_eh_frame_augmented = true;
return m_unwind_plan_eh_frame_augmented_sp;
}
Mutex::Locker lock (m_mutex);
m_tried_unwind_plan_eh_frame_augmented = true;
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_eh_frame_augmented_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (!eh_frame->GetUnwindPlan (current_pc, *m_unwind_plan_eh_frame_augmented_sp))
{
m_unwind_plan_eh_frame_augmented_sp.reset();
}
else
{
// Augment the eh_frame instructions with epilogue descriptions if necessary so the
// UnwindPlan can be used at any instruction in the function.
UnwindAssemblySP assembly_profiler_sp (GetUnwindAssemblyProfiler());
if (assembly_profiler_sp)
{
if (!assembly_profiler_sp->AugmentUnwindPlanFromCallSite (m_range, thread, *m_unwind_plan_eh_frame_augmented_sp))
{
m_unwind_plan_eh_frame_augmented_sp.reset();
}
}
else
{
m_unwind_plan_eh_frame_augmented_sp.reset();
}
}
}
}
return m_unwind_plan_eh_frame_augmented_sp;
}
UnwindPlanSP
FuncUnwinders::GetAssemblyUnwindPlan (Target &target, Thread &thread, int current_offset)
{
if (m_unwind_plan_assembly_sp.get() || m_tried_unwind_plan_assembly)
return m_unwind_plan_assembly_sp;
Mutex::Locker lock (m_mutex);
m_tried_unwind_plan_assembly = true;
UnwindAssemblySP assembly_profiler_sp (GetUnwindAssemblyProfiler());
if (assembly_profiler_sp)
{
m_unwind_plan_assembly_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
if (!assembly_profiler_sp->GetNonCallSiteUnwindPlanFromAssembly (m_range, thread, *m_unwind_plan_assembly_sp))
{
m_unwind_plan_assembly_sp.reset();
}
}
return m_unwind_plan_assembly_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanAtNonCallSite (Target& target, Thread& thread, int current_offset)
{
UnwindPlanSP non_call_site_unwindplan_sp = GetEHFrameAugmentedUnwindPlan (target, thread, current_offset);
if (non_call_site_unwindplan_sp.get() == nullptr)
{
non_call_site_unwindplan_sp = GetAssemblyUnwindPlan (target, thread, current_offset);
}
return non_call_site_unwindplan_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanFastUnwind (Thread& thread)
{
if (m_unwind_plan_fast_sp.get() || m_tried_unwind_fast)
return m_unwind_plan_fast_sp;
Mutex::Locker locker (m_mutex);
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)
{
if (m_unwind_plan_arch_default_sp.get() || m_tried_unwind_arch_default)
return m_unwind_plan_arch_default_sp;
Mutex::Locker locker (m_mutex);
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 (!abi->CreateDefaultUnwindPlan(*m_unwind_plan_arch_default_sp))
{
m_unwind_plan_arch_default_sp.reset();
}
}
}
return m_unwind_plan_arch_default_sp;
}
UnwindPlanSP
FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry (Thread& thread)
{
if (m_unwind_plan_arch_default_at_func_entry_sp.get() || m_tried_unwind_arch_default_at_func_entry)
return m_unwind_plan_arch_default_at_func_entry_sp;
Mutex::Locker locker (m_mutex);
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 (!abi->CreateFunctionEntryUnwindPlan(*m_unwind_plan_arch_default_at_func_entry_sp))
{
m_unwind_plan_arch_default_at_func_entry_sp.reset();
}
}
}
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;
Mutex::Locker locker (m_mutex);
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 (Target &target)
{
Address lsda_addr;
UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan (target, -1);
if (unwind_plan_sp.get() == nullptr)
{
unwind_plan_sp = GetCompactUnwindUnwindPlan (target, -1);
}
if (unwind_plan_sp.get() && unwind_plan_sp->GetLSDAAddress().IsValid())
{
lsda_addr = unwind_plan_sp->GetLSDAAddress();
}
return lsda_addr;
}
Address
FuncUnwinders::GetPersonalityRoutinePtrAddress (Target &target)
{
Address personality_addr;
UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan (target, -1);
if (unwind_plan_sp.get() == nullptr)
{
unwind_plan_sp = GetCompactUnwindUnwindPlan (target, -1);
}
if (unwind_plan_sp.get() && unwind_plan_sp->GetPersonalityFunctionPtr().IsValid())
{
personality_addr = unwind_plan_sp->GetPersonalityFunctionPtr();
}
return personality_addr;
}
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