int Address::CompareFileAddress(const Address &a, const Address &b) {
addr_t a_file_addr = a.GetFileAddress();
addr_t b_file_addr = b.GetFileAddress();
if (a_file_addr < b_file_addr)
return -1;
if (a_file_addr > b_file_addr)
return +1;
return 0;
}
bool lldb_private::operator>(const Address &lhs, const Address &rhs) {
ModuleSP lhs_module_sp(lhs.GetModule());
ModuleSP rhs_module_sp(rhs.GetModule());
Module *lhs_module = lhs_module_sp.get();
Module *rhs_module = rhs_module_sp.get();
if (lhs_module == rhs_module) {
// Addresses are in the same module, just compare the file addresses
return lhs.GetFileAddress() > rhs.GetFileAddress();
} else {
// The addresses are from different modules, just use the module
// pointer value to get consistent ordering
return lhs_module > rhs_module;
}
}
bool
Variable::LocationIsValidForAddress (const Address &address)
{
// Be sure to resolve the address to section offset prior to
// calling this function.
if (address.IsSectionOffset())
{
SymbolContext sc;
CalculateSymbolContext(&sc);
if (sc.module_sp == address.GetModule())
{
// Is the variable is described by a single location?
if (!m_location.IsLocationList())
{
// Yes it is, the location is valid.
return true;
}
if (sc.function)
{
addr_t loclist_base_file_addr = sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
if (loclist_base_file_addr == LLDB_INVALID_ADDRESS)
return false;
// It is a location list. We just need to tell if the location
// list contains the current address when converted to a load
// address
return m_location.LocationListContainsAddress (loclist_base_file_addr,
address.GetFileAddress());
}
}
}
return false;
}
FuncUnwindersSP
UnwindTable::GetFuncUnwindersContainingAddress(const Address &addr,
SymbolContext &sc) {
Initialize();
std::lock_guard<std::mutex> guard(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;
}
auto range_or = GetAddressRange(addr, sc);
if (!range_or)
return nullptr;
FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, *range_or));
m_unwinds.insert(insert_pos,
std::make_pair(range_or->GetBaseAddress().GetFileAddress(),
func_unwinder_sp));
return func_unwinder_sp;
}
int Address::CompareModulePointerAndOffset(const Address &a, const Address &b) {
ModuleSP a_module_sp(a.GetModule());
ModuleSP b_module_sp(b.GetModule());
Module *a_module = a_module_sp.get();
Module *b_module = b_module_sp.get();
if (a_module < b_module)
return -1;
if (a_module > b_module)
return +1;
// Modules are the same, just compare the file address since they should
// be unique
addr_t a_file_addr = a.GetFileAddress();
addr_t b_file_addr = b.GetFileAddress();
if (a_file_addr < b_file_addr)
return -1;
if (a_file_addr > b_file_addr)
return +1;
return 0;
}
uint32_t
Module::ResolveSymbolContextForAddress (const Address& so_addr, uint32_t resolve_scope, SymbolContext& sc)
{
Mutex::Locker locker (m_mutex);
uint32_t resolved_flags = 0;
// Clear the result symbol context in case we don't find anything
sc.Clear();
// Get the section from the section/offset address.
const Section *section = so_addr.GetSection();
// Make sure the section matches this module before we try and match anything
if (section && section->GetModule() == this)
{
// If the section offset based address resolved itself, then this
// is the right module.
sc.module_sp = GetSP();
resolved_flags |= eSymbolContextModule;
// Resolve the compile unit, function, block, line table or line
// entry if requested.
if (resolve_scope & eSymbolContextCompUnit ||
resolve_scope & eSymbolContextFunction ||
resolve_scope & eSymbolContextBlock ||
resolve_scope & eSymbolContextLineEntry )
{
SymbolVendor *symbols = GetSymbolVendor ();
if (symbols)
resolved_flags |= symbols->ResolveSymbolContext (so_addr, resolve_scope, sc);
}
// Resolve the symbol if requested, but don't re-look it up if we've already found it.
if (resolve_scope & eSymbolContextSymbol && !(resolved_flags & eSymbolContextSymbol))
{
ObjectFile* ofile = GetObjectFile();
if (ofile)
{
Symtab *symtab = ofile->GetSymtab();
if (symtab)
{
if (so_addr.IsSectionOffset())
{
sc.symbol = symtab->FindSymbolContainingFileAddress(so_addr.GetFileAddress());
if (sc.symbol)
resolved_flags |= eSymbolContextSymbol;
}
}
}
}
}
return resolved_flags;
}
bool EmulateInstruction::SetInstruction(const Opcode &opcode,
const Address &inst_addr,
Target *target) {
m_opcode = opcode;
m_addr = LLDB_INVALID_ADDRESS;
if (inst_addr.IsValid()) {
if (target != nullptr)
m_addr = inst_addr.GetLoadAddress(target);
if (m_addr == LLDB_INVALID_ADDRESS)
m_addr = inst_addr.GetFileAddress();
}
return true;
}
uint32_t
SymbolFileSymtab::ResolveSymbolContext (const Address& so_addr, uint32_t resolve_scope, SymbolContext& sc)
{
if (m_obj_file->GetSymtab() == NULL)
return 0;
uint32_t resolved_flags = 0;
if (resolve_scope & eSymbolContextSymbol)
{
sc.symbol = m_obj_file->GetSymtab()->FindSymbolContainingFileAddress(so_addr.GetFileAddress());
if (sc.symbol)
resolved_flags |= eSymbolContextSymbol;
}
return resolved_flags;
}
bool
DWARFCallFrameInfo::GetUnwindPlan (Address addr, UnwindPlan& unwind_plan)
{
FDEEntryMap::Entry fde_entry;
// Make sure that the Address we're searching for is the same object file
// as this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
ModuleSP module_sp = addr.GetModule();
if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr || module_sp->GetObjectFile() != &m_objfile)
return false;
if (GetFDEEntryByFileAddress (addr.GetFileAddress(), fde_entry) == false)
return false;
return FDEToUnwindPlan (fde_entry.data, addr, unwind_plan);
}
bool AddressRange::ContainsFileAddress(const Address &addr) const {
if (addr.GetSection() == m_base_addr.GetSection())
return (addr.GetOffset() - m_base_addr.GetOffset()) < GetByteSize();
addr_t file_base_addr = GetBaseAddress().GetFileAddress();
if (file_base_addr == LLDB_INVALID_ADDRESS)
return false;
addr_t file_addr = addr.GetFileAddress();
if (file_addr == LLDB_INVALID_ADDRESS)
return false;
if (file_base_addr <= file_addr)
return (file_addr - file_base_addr) < GetByteSize();
return false;
}
void Materialize(lldb::StackFrameSP &frame_sp, IRMemoryMap &map,
lldb::addr_t process_address, Status &err) override {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
const lldb::addr_t load_addr = process_address + m_offset;
if (log) {
log->Printf("EntitySymbol::Materialize [address = 0x%" PRIx64
", m_symbol = %s]",
(uint64_t)load_addr, m_symbol.GetName().AsCString());
}
const Address sym_address = m_symbol.GetAddress();
ExecutionContextScope *exe_scope = map.GetBestExecutionContextScope();
lldb::TargetSP target_sp;
if (exe_scope)
target_sp = map.GetBestExecutionContextScope()->CalculateTarget();
if (!target_sp) {
err.SetErrorStringWithFormat(
"couldn't resolve symbol %s because there is no target",
m_symbol.GetName().AsCString());
return;
}
lldb::addr_t resolved_address = sym_address.GetLoadAddress(target_sp.get());
if (resolved_address == LLDB_INVALID_ADDRESS)
resolved_address = sym_address.GetFileAddress();
Status pointer_write_error;
map.WritePointerToMemory(load_addr, resolved_address, pointer_write_error);
if (!pointer_write_error.Success()) {
err.SetErrorStringWithFormat(
"couldn't write the address of symbol %s: %s",
m_symbol.GetName().AsCString(), pointer_write_error.AsCString());
return;
}
}
bool
Variable::DumpLocationForAddress (Stream *s, const Address &address)
{
// Be sure to resolve the address to section offset prior to
// calling this function.
if (address.IsSectionOffset())
{
SymbolContext sc;
CalculateSymbolContext(&sc);
if (sc.module_sp == address.GetModule())
{
ABI *abi = nullptr;
if (m_owner_scope)
{
ModuleSP module_sp (m_owner_scope->CalculateSymbolContextModule());
if (module_sp)
abi = ABI::FindPlugin (module_sp->GetArchitecture()).get();
}
const addr_t file_addr = address.GetFileAddress();
if (sc.function)
{
if (sc.function->GetAddressRange().ContainsFileAddress(address))
{
addr_t loclist_base_file_addr = sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
if (loclist_base_file_addr == LLDB_INVALID_ADDRESS)
return false;
return m_location.DumpLocationForAddress (s,
eDescriptionLevelBrief,
loclist_base_file_addr,
file_addr,
abi);
}
}
return m_location.DumpLocationForAddress (s,
eDescriptionLevelBrief,
LLDB_INVALID_ADDRESS,
file_addr,
abi);
}
}
return false;
}
bool
DWARFCallFrameInfo::GetAddressRange (Address addr, AddressRange &range)
{
// Make sure that the Address we're searching for is the same object file
// as this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
ModuleSP module_sp = addr.GetModule();
if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr || module_sp->GetObjectFile() != &m_objfile)
return false;
if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
return false;
GetFDEIndex();
FDEEntryMap::Entry *fde_entry = m_fde_index.FindEntryThatContains (addr.GetFileAddress());
if (!fde_entry)
return false;
range = AddressRange(fde_entry->base, fde_entry->size, m_objfile.GetSectionList());
return true;
}
FuncUnwindersSP
UnwindTable::GetFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc)
{
FuncUnwindersSP no_unwind_found;
Initialize();
// 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 == NULL || !m_eh_frame->GetAddressRange (addr, range))
{
return no_unwind_found;
}
}
FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, m_assembly_profiler, range));
m_unwinds.insert (insert_pos, std::make_pair(range.GetBaseAddress().GetFileAddress(), func_unwinder_sp));
// StreamFile s(stdout);
// Dump (s);
return func_unwinder_sp;
}
bool
SymbolContext::GetParentOfInlinedScope (const Address &curr_frame_pc,
SymbolContext &next_frame_sc,
Address &next_frame_pc) const
{
next_frame_sc.Clear(false);
next_frame_pc.Clear();
if (block)
{
//const addr_t curr_frame_file_addr = curr_frame_pc.GetFileAddress();
// In order to get the parent of an inlined function we first need to
// see if we are in an inlined block as "this->block" could be an
// inlined block, or a parent of "block" could be. So lets check if
// this block or one of this blocks parents is an inlined function.
Block *curr_inlined_block = block->GetContainingInlinedBlock();
if (curr_inlined_block)
{
// "this->block" is contained in an inline function block, so to
// get the scope above the inlined block, we get the parent of the
// inlined block itself
Block *next_frame_block = curr_inlined_block->GetParent();
// Now calculate the symbol context of the containing block
next_frame_block->CalculateSymbolContext (&next_frame_sc);
// If we get here we weren't able to find the return line entry using the nesting of the blocks and
// the line table. So just use the call site info from our inlined block.
AddressRange range;
if (curr_inlined_block->GetRangeContainingAddress (curr_frame_pc, range))
{
// To see there this new frame block it, we need to look at the
// call site information from
const InlineFunctionInfo* curr_inlined_block_inlined_info = curr_inlined_block->GetInlinedFunctionInfo();
next_frame_pc = range.GetBaseAddress();
next_frame_sc.line_entry.range.GetBaseAddress() = next_frame_pc;
next_frame_sc.line_entry.file = curr_inlined_block_inlined_info->GetCallSite().GetFile();
next_frame_sc.line_entry.line = curr_inlined_block_inlined_info->GetCallSite().GetLine();
next_frame_sc.line_entry.column = curr_inlined_block_inlined_info->GetCallSite().GetColumn();
return true;
}
else
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_SYMBOLS));
if (log)
{
log->Printf ("warning: inlined block 0x%8.8" PRIx64 " doesn't have a range that contains file address 0x%" PRIx64,
curr_inlined_block->GetID(), curr_frame_pc.GetFileAddress());
}
#ifdef LLDB_CONFIGURATION_DEBUG
else
{
ObjectFile *objfile = NULL;
if (module_sp)
{
SymbolVendor *symbol_vendor = module_sp->GetSymbolVendor();
if (symbol_vendor)
{
SymbolFile *symbol_file = symbol_vendor->GetSymbolFile();
if (symbol_file)
objfile = symbol_file->GetObjectFile();
}
}
if (objfile)
{
Host::SystemLog (Host::eSystemLogWarning,
"warning: inlined block 0x%8.8" PRIx64 " doesn't have a range that contains file address 0x%" PRIx64 " in %s\n",
curr_inlined_block->GetID(),
curr_frame_pc.GetFileAddress(),
objfile->GetFileSpec().GetPath().c_str());
}
else
{
Host::SystemLog (Host::eSystemLogWarning,
"warning: inlined block 0x%8.8" PRIx64 " doesn't have a range that contains file address 0x%" PRIx64 "\n",
curr_inlined_block->GetID(),
curr_frame_pc.GetFileAddress());
}
}
#endif
}
}
}
return false;
}
bool
DWARFCallFrameInfo::FDEToUnwindPlan (dw_offset_t dwarf_offset, Address startaddr, UnwindPlan& unwind_plan)
{
lldb::offset_t offset = dwarf_offset;
lldb::offset_t current_entry = offset;
if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
return false;
if (m_cfi_data_initialized == false)
GetCFIData();
uint32_t length = m_cfi_data.GetU32 (&offset);
dw_offset_t cie_offset;
bool is_64bit = (length == UINT32_MAX);
if (is_64bit) {
length = m_cfi_data.GetU64 (&offset);
cie_offset = m_cfi_data.GetU64 (&offset);
} else {
cie_offset = m_cfi_data.GetU32 (&offset);
}
assert (cie_offset != 0 && cie_offset != UINT32_MAX);
// Translate the CIE_id from the eh_frame format, which
// is relative to the FDE offset, into a __eh_frame section
// offset
if (m_is_eh_frame)
{
unwind_plan.SetSourceName ("eh_frame CFI");
cie_offset = current_entry + (is_64bit ? 12 : 4) - cie_offset;
unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
}
else
{
unwind_plan.SetSourceName ("DWARF CFI");
// In theory the debug_frame info should be valid at all call sites
// ("asynchronous unwind info" as it is sometimes called) but in practice
// gcc et al all emit call frame info for the prologue and call sites, but
// not for the epilogue or all the other locations during the function reliably.
unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
}
unwind_plan.SetSourcedFromCompiler (eLazyBoolYes);
const CIE *cie = GetCIE (cie_offset);
assert (cie != nullptr);
const dw_offset_t end_offset = current_entry + length + (is_64bit ? 12 : 4);
const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
lldb::addr_t range_base = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr);
lldb::addr_t range_len = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr, text_addr, data_addr);
AddressRange range (range_base, m_objfile.GetAddressByteSize(), m_objfile.GetSectionList());
range.SetByteSize (range_len);
addr_t lsda_data_file_address = LLDB_INVALID_ADDRESS;
if (cie->augmentation[0] == 'z')
{
uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
if (aug_data_len != 0 && cie->lsda_addr_encoding != DW_EH_PE_omit)
{
offset_t saved_offset = offset;
lsda_data_file_address = m_cfi_data.GetGNUEHPointer(&offset, cie->lsda_addr_encoding, pc_rel_addr, text_addr, data_addr);
if (offset - saved_offset != aug_data_len)
{
// There is more in the augmentation region than we know how to process;
// don't read anything.
lsda_data_file_address = LLDB_INVALID_ADDRESS;
}
offset = saved_offset;
}
offset += aug_data_len;
}
Address lsda_data;
Address personality_function_ptr;
if (lsda_data_file_address != LLDB_INVALID_ADDRESS && cie->personality_loc != LLDB_INVALID_ADDRESS)
{
m_objfile.GetModule()->ResolveFileAddress (lsda_data_file_address, lsda_data);
m_objfile.GetModule()->ResolveFileAddress (cie->personality_loc, personality_function_ptr);
}
if (lsda_data.IsValid() && personality_function_ptr.IsValid())
{
unwind_plan.SetLSDAAddress (lsda_data);
unwind_plan.SetPersonalityFunctionPtr (personality_function_ptr);
}
uint32_t code_align = cie->code_align;
int32_t data_align = cie->data_align;
unwind_plan.SetPlanValidAddressRange (range);
UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
*cie_initial_row = cie->initial_row;
UnwindPlan::RowSP row(cie_initial_row);
unwind_plan.SetRegisterKind (m_reg_kind);
unwind_plan.SetReturnAddressRegister (cie->return_addr_reg_num);
std::vector<UnwindPlan::RowSP> stack;
UnwindPlan::Row::RegisterLocation reg_location;
while (m_cfi_data.ValidOffset(offset) && offset < end_offset)
{
uint8_t inst = m_cfi_data.GetU8(&offset);
uint8_t primary_opcode = inst & 0xC0;
uint8_t extended_opcode = inst & 0x3F;
if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode, data_align, offset, *row))
{
if (primary_opcode)
{
switch (primary_opcode)
{
case DW_CFA_advance_loc : // (Row Creation Instruction)
{ // 0x40 - high 2 bits are 0x1, lower 6 bits are delta
// takes a single argument that represents a constant delta. The
// required action is to create a new table row with a location
// value that is computed by taking the current entry's location
// value and adding (delta * code_align). All other
// values in the new row are initially identical to the current row.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset(extended_opcode * code_align);
break;
}
case DW_CFA_restore :
{ // 0xC0 - high 2 bits are 0x3, lower 6 bits are register
// takes a single argument that represents a register number. The
// required action is to change the rule for the indicated register
// to the rule assigned it by the initial_instructions in the CIE.
uint32_t reg_num = extended_opcode;
// We only keep enough register locations around to
// unwind what is in our thread, and these are organized
// by the register index in that state, so we need to convert our
// GCC register number from the EH frame info, to a register index
if (unwind_plan.IsValidRowIndex(0) && unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num, reg_location))
row->SetRegisterInfo (reg_num, reg_location);
break;
}
}
}
else
{
switch (extended_opcode)
{
case DW_CFA_set_loc : // 0x1 (Row Creation Instruction)
{
// DW_CFA_set_loc takes a single argument that represents an address.
// The required action is to create a new table row using the
// specified address as the location. All other values in the new row
// are initially identical to the current row. The new location value
// should always be greater than the current one.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SetOffset(m_cfi_data.GetPointer(&offset) - startaddr.GetFileAddress());
break;
}
case DW_CFA_advance_loc1 : // 0x2 (Row Creation Instruction)
{
// takes a single uword argument that represents a constant delta.
// This instruction is identical to DW_CFA_advance_loc except for the
// encoding and size of the delta argument.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset (m_cfi_data.GetU8(&offset) * code_align);
break;
}
case DW_CFA_advance_loc2 : // 0x3 (Row Creation Instruction)
{
// takes a single uword argument that represents a constant delta.
// This instruction is identical to DW_CFA_advance_loc except for the
// encoding and size of the delta argument.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset (m_cfi_data.GetU16(&offset) * code_align);
break;
}
case DW_CFA_advance_loc4 : // 0x4 (Row Creation Instruction)
{
// takes a single uword argument that represents a constant delta.
// This instruction is identical to DW_CFA_advance_loc except for the
// encoding and size of the delta argument.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset (m_cfi_data.GetU32(&offset) * code_align);
break;
}
case DW_CFA_restore_extended : // 0x6
{
// takes a single unsigned LEB128 argument that represents a register
// number. This instruction is identical to DW_CFA_restore except for
// the encoding and size of the register argument.
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
if (unwind_plan.IsValidRowIndex(0) && unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num, reg_location))
row->SetRegisterInfo (reg_num, reg_location);
break;
}
case DW_CFA_remember_state : // 0xA
{
// These instructions define a stack of information. Encountering the
// DW_CFA_remember_state instruction means to save the rules for every
// register on the current row on the stack. Encountering the
// DW_CFA_restore_state instruction means to pop the set of rules off
// the stack and place them in the current row. (This operation is
// useful for compilers that move epilogue code into the body of a
// function.)
stack.push_back (row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
break;
}
case DW_CFA_restore_state : // 0xB
{
// These instructions define a stack of information. Encountering the
// DW_CFA_remember_state instruction means to save the rules for every
// register on the current row on the stack. Encountering the
// DW_CFA_restore_state instruction means to pop the set of rules off
// the stack and place them in the current row. (This operation is
// useful for compilers that move epilogue code into the body of a
// function.)
lldb::addr_t offset = row->GetOffset ();
row = stack.back ();
stack.pop_back ();
row->SetOffset (offset);
break;
}
case DW_CFA_val_offset : // 0x14
case DW_CFA_val_offset_sf : // 0x15
default:
break;
}
}
}
}
unwind_plan.AppendRow(row);
return true;
}
bool
CompactUnwindInfo::GetCompactUnwindInfoForFunction (Target &target, Address address, FunctionInfo &unwind_info)
{
unwind_info.encoding = 0;
unwind_info.lsda_address.Clear();
unwind_info.personality_ptr_address.Clear();
if (!IsValid (target.GetProcessSP()))
return false;
addr_t text_section_file_address = LLDB_INVALID_ADDRESS;
SectionList *sl = m_objfile.GetSectionList ();
if (sl)
{
SectionSP text_sect = sl->FindSectionByType (eSectionTypeCode, true);
if (text_sect.get())
{
text_section_file_address = text_sect->GetFileAddress();
}
}
if (text_section_file_address == LLDB_INVALID_ADDRESS)
return false;
addr_t function_offset = address.GetFileAddress() - m_objfile.GetHeaderAddress().GetFileAddress();
UnwindIndex key;
key.function_offset = function_offset;
std::vector<UnwindIndex>::const_iterator it;
it = std::lower_bound (m_indexes.begin(), m_indexes.end(), key);
if (it == m_indexes.end())
{
return false;
}
if (it->function_offset != key.function_offset)
{
if (it != m_indexes.begin())
--it;
}
if (it->sentinal_entry == true)
{
return false;
}
auto next_it = it + 1;
if (next_it != m_indexes.end())
{
// initialize the function offset end range to be the start of the
// next index offset. If we find an entry which is at the end of
// the index table, this will establish the range end.
unwind_info.valid_range_offset_end = next_it->function_offset;
}
offset_t second_page_offset = it->second_level;
offset_t lsda_array_start = it->lsda_array_start;
offset_t lsda_array_count = (it->lsda_array_end - it->lsda_array_start) / 8;
offset_t offset = second_page_offset;
uint32_t kind = m_unwindinfo_data.GetU32(&offset); // UNWIND_SECOND_LEVEL_REGULAR or UNWIND_SECOND_LEVEL_COMPRESSED
if (kind == UNWIND_SECOND_LEVEL_REGULAR)
{
// struct unwind_info_regular_second_level_page_header
// {
// uint32_t kind; // UNWIND_SECOND_LEVEL_REGULAR
// uint16_t entryPageOffset;
// uint16_t entryCount;
// typedef uint32_t compact_unwind_encoding_t;
// struct unwind_info_regular_second_level_entry
// {
// uint32_t functionOffset;
// compact_unwind_encoding_t encoding;
uint16_t entry_page_offset = m_unwindinfo_data.GetU16(&offset); // entryPageOffset
uint16_t entry_count = m_unwindinfo_data.GetU16(&offset); // entryCount
offset_t entry_offset = BinarySearchRegularSecondPage (second_page_offset + entry_page_offset, entry_count, function_offset, &unwind_info.valid_range_offset_start, &unwind_info.valid_range_offset_end);
if (entry_offset == LLDB_INVALID_OFFSET)
{
return false;
}
entry_offset += 4; // skip over functionOffset
unwind_info.encoding = m_unwindinfo_data.GetU32(&entry_offset); // encoding
if (unwind_info.encoding & UNWIND_HAS_LSDA)
{
SectionList *sl = m_objfile.GetSectionList ();
if (sl)
{
uint32_t lsda_offset = GetLSDAForFunctionOffset (lsda_array_start, lsda_array_count, function_offset);
addr_t objfile_header_file_address = m_objfile.GetHeaderAddress().GetFileAddress();
unwind_info.lsda_address.ResolveAddressUsingFileSections (objfile_header_file_address + lsda_offset, sl);
}
}
if (unwind_info.encoding & UNWIND_PERSONALITY_MASK)
{
uint32_t personality_index = EXTRACT_BITS (unwind_info.encoding, UNWIND_PERSONALITY_MASK);
if (personality_index > 0)
{
personality_index--;
if (personality_index < m_unwind_header.personality_array_count)
{
offset_t offset = m_unwind_header.personality_array_offset;
offset += 4 * personality_index;
SectionList *sl = m_objfile.GetSectionList ();
if (sl)
{
uint32_t personality_offset = m_unwindinfo_data.GetU32(&offset);
addr_t objfile_header_file_address = m_objfile.GetHeaderAddress().GetFileAddress();
unwind_info.personality_ptr_address.ResolveAddressUsingFileSections (objfile_header_file_address + personality_offset, sl);
}
}
}
}
return true;
}
else if (kind == UNWIND_SECOND_LEVEL_COMPRESSED)
{
// struct unwind_info_compressed_second_level_page_header
// {
// uint32_t kind; // UNWIND_SECOND_LEVEL_COMPRESSED
// uint16_t entryPageOffset; // offset from this 2nd lvl page idx to array of entries
// // (an entry has a function offset and index into the encodings)
// // NB function offset from the entry in the compressed page
// // must be added to the index's functionOffset value.
// uint16_t entryCount;
// uint16_t encodingsPageOffset; // offset from this 2nd lvl page idx to array of encodings
// uint16_t encodingsCount;
uint16_t entry_page_offset = m_unwindinfo_data.GetU16(&offset); // entryPageOffset
uint16_t entry_count = m_unwindinfo_data.GetU16(&offset); // entryCount
uint16_t encodings_page_offset = m_unwindinfo_data.GetU16(&offset); // encodingsPageOffset
uint16_t encodings_count = m_unwindinfo_data.GetU16(&offset); // encodingsCount
uint32_t encoding_index = BinarySearchCompressedSecondPage (second_page_offset + entry_page_offset, entry_count, function_offset, it->function_offset, &unwind_info.valid_range_offset_start, &unwind_info.valid_range_offset_end);
if (encoding_index == UINT32_MAX || encoding_index >= encodings_count + m_unwind_header.common_encodings_array_count)
{
return false;
}
uint32_t encoding = 0;
if (encoding_index < m_unwind_header.common_encodings_array_count)
{
offset = m_unwind_header.common_encodings_array_offset + (encoding_index * sizeof (uint32_t));
encoding = m_unwindinfo_data.GetU32(&offset); // encoding entry from the commonEncodingsArray
}
else
{
uint32_t page_specific_entry_index = encoding_index - m_unwind_header.common_encodings_array_count;
offset = second_page_offset + encodings_page_offset + (page_specific_entry_index * sizeof (uint32_t));
encoding = m_unwindinfo_data.GetU32(&offset); // encoding entry from the page-specific encoding array
}
if (encoding == 0)
return false;
unwind_info.encoding = encoding;
if (unwind_info.encoding & UNWIND_HAS_LSDA)
{
SectionList *sl = m_objfile.GetSectionList ();
if (sl)
{
uint32_t lsda_offset = GetLSDAForFunctionOffset (lsda_array_start, lsda_array_count, function_offset);
addr_t objfile_header_file_address = m_objfile.GetHeaderAddress().GetFileAddress();
unwind_info.lsda_address.ResolveAddressUsingFileSections (objfile_header_file_address + lsda_offset, sl);
}
}
if (unwind_info.encoding & UNWIND_PERSONALITY_MASK)
{
uint32_t personality_index = EXTRACT_BITS (unwind_info.encoding, UNWIND_PERSONALITY_MASK);
if (personality_index > 0)
{
personality_index--;
if (personality_index < m_unwind_header.personality_array_count)
{
offset_t offset = m_unwind_header.personality_array_offset;
offset += 4 * personality_index;
SectionList *sl = m_objfile.GetSectionList ();
if (sl)
{
uint32_t personality_offset = m_unwindinfo_data.GetU32(&offset);
addr_t objfile_header_file_address = m_objfile.GetHeaderAddress().GetFileAddress();
unwind_info.personality_ptr_address.ResolveAddressUsingFileSections (objfile_header_file_address + personality_offset, sl);
}
}
}
}
return true;
}
return false;
}
bool
DWARFCallFrameInfo::FDEToUnwindPlan (dw_offset_t offset, Address startaddr, UnwindPlan& unwind_plan)
{
dw_offset_t current_entry = offset;
if (m_section_sp.get() == NULL || m_section_sp->IsEncrypted())
return false;
if (m_cfi_data_initialized == false)
GetCFIData();
uint32_t length = m_cfi_data.GetU32 (&offset);
dw_offset_t cie_offset = m_cfi_data.GetU32 (&offset);
assert (cie_offset != 0 && cie_offset != UINT32_MAX);
// Translate the CIE_id from the eh_frame format, which
// is relative to the FDE offset, into a __eh_frame section
// offset
if (m_is_eh_frame)
{
unwind_plan.SetSourceName ("eh_frame CFI");
cie_offset = current_entry + 4 - cie_offset;
unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
}
else
{
unwind_plan.SetSourceName ("DWARF CFI");
// In theory the debug_frame info should be valid at all call sites
// ("asynchronous unwind info" as it is sometimes called) but in practice
// gcc et al all emit call frame info for the prologue and call sites, but
// not for the epilogue or all the other locations during the function reliably.
unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
}
unwind_plan.SetSourcedFromCompiler (eLazyBoolYes);
const CIE *cie = GetCIE (cie_offset);
assert (cie != NULL);
const dw_offset_t end_offset = current_entry + length + 4;
const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
lldb::addr_t range_base = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr);
lldb::addr_t range_len = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr, text_addr, data_addr);
AddressRange range (range_base, m_objfile.GetAddressByteSize(), m_objfile.GetSectionList());
range.SetByteSize (range_len);
if (cie->augmentation[0] == 'z')
{
uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
offset += aug_data_len;
}
uint32_t reg_num = 0;
int32_t op_offset = 0;
uint32_t code_align = cie->code_align;
int32_t data_align = cie->data_align;
unwind_plan.SetPlanValidAddressRange (range);
UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
*cie_initial_row = cie->initial_row;
UnwindPlan::RowSP row(cie_initial_row);
unwind_plan.SetRegisterKind (m_reg_kind);
unwind_plan.SetReturnAddressRegister (cie->return_addr_reg_num);
UnwindPlan::Row::RegisterLocation reg_location;
while (m_cfi_data.ValidOffset(offset) && offset < end_offset)
{
uint8_t inst = m_cfi_data.GetU8(&offset);
uint8_t primary_opcode = inst & 0xC0;
uint8_t extended_opcode = inst & 0x3F;
if (primary_opcode)
{
switch (primary_opcode)
{
case DW_CFA_advance_loc : // (Row Creation Instruction)
{ // 0x40 - high 2 bits are 0x1, lower 6 bits are delta
// takes a single argument that represents a constant delta. The
// required action is to create a new table row with a location
// value that is computed by taking the current entry's location
// value and adding (delta * code_align). All other
// values in the new row are initially identical to the current row.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset(extended_opcode * code_align);
}
break;
case DW_CFA_offset :
{ // 0x80 - high 2 bits are 0x2, lower 6 bits are register
// takes two arguments: an unsigned LEB128 constant representing a
// factored offset and a register number. The required action is to
// change the rule for the register indicated by the register number
// to be an offset(N) rule with a value of
// (N = factored offset * data_align).
reg_num = extended_opcode;
op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
reg_location.SetAtCFAPlusOffset(op_offset);
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_restore :
{ // 0xC0 - high 2 bits are 0x3, lower 6 bits are register
// takes a single argument that represents a register number. The
// required action is to change the rule for the indicated register
// to the rule assigned it by the initial_instructions in the CIE.
reg_num = extended_opcode;
// We only keep enough register locations around to
// unwind what is in our thread, and these are organized
// by the register index in that state, so we need to convert our
// GCC register number from the EH frame info, to a register index
if (unwind_plan.IsValidRowIndex(0) && unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num, reg_location))
row->SetRegisterInfo (reg_num, reg_location);
}
break;
}
}
else
{
switch (extended_opcode)
{
case DW_CFA_nop : // 0x0
break;
case DW_CFA_set_loc : // 0x1 (Row Creation Instruction)
{
// DW_CFA_set_loc takes a single argument that represents an address.
// The required action is to create a new table row using the
// specified address as the location. All other values in the new row
// are initially identical to the current row. The new location value
// should always be greater than the current one.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SetOffset(m_cfi_data.GetPointer(&offset) - startaddr.GetFileAddress());
}
break;
case DW_CFA_advance_loc1 : // 0x2 (Row Creation Instruction)
{
// takes a single uword argument that represents a constant delta.
// This instruction is identical to DW_CFA_advance_loc except for the
// encoding and size of the delta argument.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset (m_cfi_data.GetU8(&offset) * code_align);
}
break;
case DW_CFA_advance_loc2 : // 0x3 (Row Creation Instruction)
{
// takes a single uword argument that represents a constant delta.
// This instruction is identical to DW_CFA_advance_loc except for the
// encoding and size of the delta argument.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset (m_cfi_data.GetU16(&offset) * code_align);
}
break;
case DW_CFA_advance_loc4 : // 0x4 (Row Creation Instruction)
{
// takes a single uword argument that represents a constant delta.
// This instruction is identical to DW_CFA_advance_loc except for the
// encoding and size of the delta argument.
unwind_plan.AppendRow(row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
row->SlideOffset (m_cfi_data.GetU32(&offset) * code_align);
}
break;
case DW_CFA_offset_extended : // 0x5
{
// takes two unsigned LEB128 arguments representing a register number
// and a factored offset. This instruction is identical to DW_CFA_offset
// except for the encoding and size of the register argument.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
reg_location.SetAtCFAPlusOffset(op_offset);
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_restore_extended : // 0x6
{
// takes a single unsigned LEB128 argument that represents a register
// number. This instruction is identical to DW_CFA_restore except for
// the encoding and size of the register argument.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
if (unwind_plan.IsValidRowIndex(0) && unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num, reg_location))
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_undefined : // 0x7
{
// takes a single unsigned LEB128 argument that represents a register
// number. The required action is to set the rule for the specified
// register to undefined.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
reg_location.SetUndefined();
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_same_value : // 0x8
{
// takes a single unsigned LEB128 argument that represents a register
// number. The required action is to set the rule for the specified
// register to same value.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
reg_location.SetSame();
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_register : // 0x9
{
// takes two unsigned LEB128 arguments representing register numbers.
// The required action is to set the rule for the first register to be
// the second register.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
uint32_t other_reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
reg_location.SetInRegister(other_reg_num);
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_remember_state : // 0xA
{
// These instructions define a stack of information. Encountering the
// DW_CFA_remember_state instruction means to save the rules for every
// register on the current row on the stack. Encountering the
// DW_CFA_restore_state instruction means to pop the set of rules off
// the stack and place them in the current row. (This operation is
// useful for compilers that move epilogue code into the body of a
// function.)
unwind_plan.AppendRow (row);
UnwindPlan::Row *newrow = new UnwindPlan::Row;
*newrow = *row.get();
row.reset (newrow);
}
break;
case DW_CFA_restore_state : // 0xB
// These instructions define a stack of information. Encountering the
// DW_CFA_remember_state instruction means to save the rules for every
// register on the current row on the stack. Encountering the
// DW_CFA_restore_state instruction means to pop the set of rules off
// the stack and place them in the current row. (This operation is
// useful for compilers that move epilogue code into the body of a
// function.)
{
row = unwind_plan.GetRowAtIndex(unwind_plan.GetRowCount() - 1);
}
break;
case DW_CFA_def_cfa : // 0xC (CFA Definition Instruction)
{
// Takes two unsigned LEB128 operands representing a register
// number and a (non-factored) offset. The required action
// is to define the current CFA rule to use the provided
// register and offset.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
row->SetCFARegister (reg_num);
row->SetCFAOffset (op_offset);
}
break;
case DW_CFA_def_cfa_register : // 0xD (CFA Definition Instruction)
{
// takes a single unsigned LEB128 argument representing a register
// number. The required action is to define the current CFA rule to
// use the provided register (but to keep the old offset).
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
row->SetCFARegister (reg_num);
}
break;
case DW_CFA_def_cfa_offset : // 0xE (CFA Definition Instruction)
{
// Takes a single unsigned LEB128 operand representing a
// (non-factored) offset. The required action is to define
// the current CFA rule to use the provided offset (but
// to keep the old register).
op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
row->SetCFAOffset (op_offset);
}
break;
case DW_CFA_def_cfa_expression : // 0xF (CFA Definition Instruction)
{
size_t block_len = (size_t)m_cfi_data.GetULEB128(&offset);
offset += (uint32_t)block_len;
}
break;
case DW_CFA_expression : // 0x10
{
// Takes two operands: an unsigned LEB128 value representing
// a register number, and a DW_FORM_block value representing a DWARF
// expression. The required action is to change the rule for the
// register indicated by the register number to be an expression(E)
// rule where E is the DWARF expression. That is, the DWARF
// expression computes the address. The value of the CFA is
// pushed on the DWARF evaluation stack prior to execution of
// the DWARF expression.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
const uint8_t *block_data = (uint8_t *)m_cfi_data.GetData(&offset, block_len);
reg_location.SetAtDWARFExpression(block_data, block_len);
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_offset_extended_sf : // 0x11
{
// takes two operands: an unsigned LEB128 value representing a
// register number and a signed LEB128 factored offset. This
// instruction is identical to DW_CFA_offset_extended except
//that the second operand is signed and factored.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
reg_location.SetAtCFAPlusOffset(op_offset);
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_def_cfa_sf : // 0x12 (CFA Definition Instruction)
{
// Takes two operands: an unsigned LEB128 value representing
// a register number and a signed LEB128 factored offset.
// This instruction is identical to DW_CFA_def_cfa except
// that the second operand is signed and factored.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
row->SetCFARegister (reg_num);
row->SetCFAOffset (op_offset);
}
break;
case DW_CFA_def_cfa_offset_sf : // 0x13 (CFA Definition Instruction)
{
// takes a signed LEB128 operand representing a factored
// offset. This instruction is identical to DW_CFA_def_cfa_offset
// except that the operand is signed and factored.
op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
row->SetCFAOffset (op_offset);
}
break;
case DW_CFA_val_expression : // 0x16
{
// takes two operands: an unsigned LEB128 value representing a register
// number, and a DW_FORM_block value representing a DWARF expression.
// The required action is to change the rule for the register indicated
// by the register number to be a val_expression(E) rule where E is the
// DWARF expression. That is, the DWARF expression computes the value of
// the given register. The value of the CFA is pushed on the DWARF
// evaluation stack prior to execution of the DWARF expression.
reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
const uint8_t* block_data = (uint8_t*)m_cfi_data.GetData(&offset, block_len);
//#if defined(__i386__) || defined(__x86_64__)
// // The EH frame info for EIP and RIP contains code that looks for traps to
// // be a specific type and increments the PC.
// // For i386:
// // DW_CFA_val_expression where:
// // eip = DW_OP_breg6(+28), DW_OP_deref, DW_OP_dup, DW_OP_plus_uconst(0x34),
// // DW_OP_deref, DW_OP_swap, DW_OP_plus_uconst(0), DW_OP_deref,
// // DW_OP_dup, DW_OP_lit3, DW_OP_ne, DW_OP_swap, DW_OP_lit4, DW_OP_ne,
// // DW_OP_and, DW_OP_plus
// // This basically does a:
// // eip = ucontenxt.mcontext32->gpr.eip;
// // if (ucontenxt.mcontext32->exc.trapno != 3 && ucontenxt.mcontext32->exc.trapno != 4)
// // eip++;
// //
// // For x86_64:
// // DW_CFA_val_expression where:
// // rip = DW_OP_breg3(+48), DW_OP_deref, DW_OP_dup, DW_OP_plus_uconst(0x90), DW_OP_deref,
// // DW_OP_swap, DW_OP_plus_uconst(0), DW_OP_deref_size(4), DW_OP_dup, DW_OP_lit3,
// // DW_OP_ne, DW_OP_swap, DW_OP_lit4, DW_OP_ne, DW_OP_and, DW_OP_plus
// // This basically does a:
// // rip = ucontenxt.mcontext64->gpr.rip;
// // if (ucontenxt.mcontext64->exc.trapno != 3 && ucontenxt.mcontext64->exc.trapno != 4)
// // rip++;
// // The trap comparisons and increments are not needed as it hoses up the unwound PC which
// // is expected to point at least past the instruction that causes the fault/trap. So we
// // take it out by trimming the expression right at the first "DW_OP_swap" opcodes
// if (block_data != NULL && thread->GetPCRegNum(Thread::GCC) == reg_num)
// {
// if (thread->Is64Bit())
// {
// if (block_len > 9 && block_data[8] == DW_OP_swap && block_data[9] == DW_OP_plus_uconst)
// block_len = 8;
// }
// else
// {
// if (block_len > 8 && block_data[7] == DW_OP_swap && block_data[8] == DW_OP_plus_uconst)
// block_len = 7;
// }
// }
//#endif
reg_location.SetIsDWARFExpression(block_data, block_len);
row->SetRegisterInfo (reg_num, reg_location);
}
break;
case DW_CFA_val_offset : // 0x14
case DW_CFA_val_offset_sf : // 0x15
default:
break;
}
}
}
unwind_plan.AppendRow(row);
return true;
}
