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

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//===-- UnwindPlan.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/UnwindPlan.h"
#include "lldb/Core/ConstString.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
bool
UnwindPlan::Row::RegisterLocation::operator == (const UnwindPlan::Row::RegisterLocation& rhs) const
{
if (m_type == rhs.m_type)
{
switch (m_type)
{
case unspecified:
case undefined:
case same:
return true;
case atCFAPlusOffset:
case isCFAPlusOffset:
return m_location.offset == rhs.m_location.offset;
case inOtherRegister:
return m_location.reg_num == rhs.m_location.reg_num;
case atDWARFExpression:
case isDWARFExpression:
if (m_location.expr.length == rhs.m_location.expr.length)
return !memcmp (m_location.expr.opcodes, rhs.m_location.expr.opcodes, m_location.expr.length);
break;
}
}
return false;
}
// This function doesn't copy the dwarf expression bytes; they must remain in allocated
// memory for the lifespan of this UnwindPlan object.
void
UnwindPlan::Row::RegisterLocation::SetAtDWARFExpression (const uint8_t *opcodes, uint32_t len)
{
m_type = atDWARFExpression;
m_location.expr.opcodes = opcodes;
m_location.expr.length = len;
}
// This function doesn't copy the dwarf expression bytes; they must remain in allocated
// memory for the lifespan of this UnwindPlan object.
void
UnwindPlan::Row::RegisterLocation::SetIsDWARFExpression (const uint8_t *opcodes, uint32_t len)
{
m_type = isDWARFExpression;
m_location.expr.opcodes = opcodes;
m_location.expr.length = len;
}
void
UnwindPlan::Row::RegisterLocation::Dump (Stream &s, const UnwindPlan* unwind_plan, const UnwindPlan::Row* row, Thread* thread, bool verbose) const
{
switch (m_type)
{
case unspecified:
if (verbose)
s.PutCString ("=<unspec>");
else
s.PutCString ("=!");
break;
case undefined:
if (verbose)
s.PutCString ("=<undef>");
else
s.PutCString ("=?");
break;
case same:
s.PutCString ("= <same>");
break;
case atCFAPlusOffset:
case isCFAPlusOffset:
{
s.PutChar('=');
if (m_type == atCFAPlusOffset)
s.PutChar('[');
if (verbose)
s.Printf ("CFA%+d", m_location.offset);
if (unwind_plan && row)
{
const uint32_t cfa_reg = row->GetCFARegister();
const RegisterInfo *cfa_reg_info = unwind_plan->GetRegisterInfo (thread, cfa_reg);
const int32_t offset = row->GetCFAOffset() + m_location.offset;
if (verbose)
{
if (cfa_reg_info)
s.Printf (" (%s%+d)", cfa_reg_info->name, offset);
else
s.Printf (" (reg(%u)%+d)", cfa_reg, offset);
}
else
{
if (cfa_reg_info)
s.Printf ("%s", cfa_reg_info->name);
else
s.Printf ("reg(%u)", cfa_reg);
if (offset != 0)
s.Printf ("%+d", offset);
}
}
if (m_type == atCFAPlusOffset)
s.PutChar(']');
}
break;
case inOtherRegister:
{
const RegisterInfo *other_reg_info = NULL;
if (unwind_plan)
other_reg_info = unwind_plan->GetRegisterInfo (thread, m_location.reg_num);
if (other_reg_info)
s.Printf ("=%s", other_reg_info->name);
else
s.Printf ("=reg(%u)", m_location.reg_num);
}
break;
case atDWARFExpression:
case isDWARFExpression:
{
s.PutChar('=');
if (m_type == atDWARFExpression)
s.PutCString("[dwarf-expr]");
else
s.PutCString("dwarf-expr");
}
break;
}
}
void
UnwindPlan::Row::Clear ()
{
m_offset = 0;
m_cfa_reg_num = 0;
m_cfa_offset = 0;
m_register_locations.clear();
}
void
UnwindPlan::Row::Dump (Stream& s, const UnwindPlan* unwind_plan, Thread* thread, addr_t base_addr) const
{
const RegisterInfo *reg_info = unwind_plan->GetRegisterInfo (thread, GetCFARegister());
if (base_addr != LLDB_INVALID_ADDRESS)
s.Printf ("0x%16.16llx: CFA=", base_addr + GetOffset());
else
s.Printf ("0x%8.8llx: CFA=", GetOffset());
if (reg_info)
s.Printf ("%s", reg_info->name);
else
s.Printf ("reg(%u)", GetCFARegister());
s.Printf ("%+3d => ", GetCFAOffset ());
for (collection::const_iterator idx = m_register_locations.begin (); idx != m_register_locations.end (); ++idx)
{
reg_info = unwind_plan->GetRegisterInfo (thread, idx->first);
if (reg_info)
s.Printf ("%s", reg_info->name);
else
s.Printf ("reg(%u)", idx->first);
const bool verbose = false;
idx->second.Dump(s, unwind_plan, this, thread, verbose);
s.PutChar (' ');
}
s.EOL();
}
UnwindPlan::Row::Row() :
m_offset(0),
m_cfa_reg_num(0),
m_cfa_offset(0),
m_register_locations()
{
}
bool
UnwindPlan::Row::GetRegisterInfo (uint32_t reg_num, UnwindPlan::Row::RegisterLocation& register_location) const
{
collection::const_iterator pos = m_register_locations.find(reg_num);
if (pos != m_register_locations.end())
{
register_location = pos->second;
return true;
}
return false;
}
void
UnwindPlan::Row::SetRegisterInfo (uint32_t reg_num, const UnwindPlan::Row::RegisterLocation register_location)
{
m_register_locations[reg_num] = register_location;
}
bool
UnwindPlan::Row::SetRegisterLocationToAtCFAPlusOffset (uint32_t reg_num, int32_t offset, bool can_replace)
{
if (!can_replace && m_register_locations.find(reg_num) != m_register_locations.end())
return false;
RegisterLocation reg_loc;
reg_loc.SetAtCFAPlusOffset(offset);
m_register_locations[reg_num] = reg_loc;
return true;
}
bool
UnwindPlan::Row::SetRegisterLocationToIsCFAPlusOffset (uint32_t reg_num, int32_t offset, bool can_replace)
{
if (!can_replace && m_register_locations.find(reg_num) != m_register_locations.end())
return false;
RegisterLocation reg_loc;
reg_loc.SetIsCFAPlusOffset(offset);
m_register_locations[reg_num] = reg_loc;
return true;
}
bool
UnwindPlan::Row::SetRegisterLocationToUndefined (uint32_t reg_num, bool can_replace, bool can_replace_only_if_unspecified)
{
collection::iterator pos = m_register_locations.find(reg_num);
collection::iterator end = m_register_locations.end();
if (pos != end)
{
if (!can_replace)
return false;
if (can_replace_only_if_unspecified && !pos->second.IsUnspecified())
return false;
}
RegisterLocation reg_loc;
reg_loc.SetUndefined();
m_register_locations[reg_num] = reg_loc;
return true;
}
bool
UnwindPlan::Row::SetRegisterLocationToUnspecified (uint32_t reg_num, bool can_replace)
{
if (!can_replace && m_register_locations.find(reg_num) != m_register_locations.end())
return false;
RegisterLocation reg_loc;
reg_loc.SetUnspecified();
m_register_locations[reg_num] = reg_loc;
return true;
}
bool
UnwindPlan::Row::SetRegisterLocationToRegister (uint32_t reg_num,
uint32_t other_reg_num,
bool can_replace)
{
if (!can_replace && m_register_locations.find(reg_num) != m_register_locations.end())
return false;
RegisterLocation reg_loc;
reg_loc.SetInRegister(other_reg_num);
m_register_locations[reg_num] = reg_loc;
return true;
}
bool
UnwindPlan::Row::SetRegisterLocationToSame (uint32_t reg_num, bool must_replace)
{
if (must_replace && m_register_locations.find(reg_num) == m_register_locations.end())
return false;
RegisterLocation reg_loc;
reg_loc.SetSame();
m_register_locations[reg_num] = reg_loc;
return true;
}
void
UnwindPlan::Row::SetCFARegister (uint32_t reg_num)
{
m_cfa_reg_num = reg_num;
}
bool
UnwindPlan::Row::operator == (const UnwindPlan::Row& rhs) const
{
if (m_offset != rhs.m_offset || m_cfa_reg_num != rhs.m_cfa_reg_num || m_cfa_offset != rhs.m_cfa_offset)
return false;
return m_register_locations == rhs.m_register_locations;
}
void
UnwindPlan::AppendRow (const UnwindPlan::RowSP &row_sp)
{
if (m_row_list.empty() || m_row_list.back()->GetOffset() != row_sp->GetOffset())
m_row_list.push_back(row_sp);
else
m_row_list.back() = row_sp;
}
UnwindPlan::RowSP
UnwindPlan::GetRowForFunctionOffset (int offset) const
{
RowSP row;
if (!m_row_list.empty())
{
if (offset == -1)
row = m_row_list.back();
else
{
collection::const_iterator pos, end = m_row_list.end();
for (pos = m_row_list.begin(); pos != end; ++pos)
{
if ((*pos)->GetOffset() <= offset)
row = *pos;
else
break;
}
}
}
return row;
}
bool
UnwindPlan::IsValidRowIndex (uint32_t idx) const
{
return idx < m_row_list.size();
}
const UnwindPlan::RowSP
UnwindPlan::GetRowAtIndex (uint32_t idx) const
{
// You must call IsValidRowIndex(idx) first before calling this!!!
assert (idx < m_row_list.size());
return m_row_list[idx];
}
const UnwindPlan::RowSP
UnwindPlan::GetLastRow () const
{
// You must call GetRowCount() first to make sure there is at least one row
assert (!m_row_list.empty());
return m_row_list.back();
}
int
UnwindPlan::GetRowCount () const
{
return m_row_list.size ();
}
void
UnwindPlan::SetPlanValidAddressRange (const AddressRange& range)
{
if (range.GetBaseAddress().IsValid() && range.GetByteSize() != 0)
m_plan_valid_address_range = range;
}
bool
UnwindPlan::PlanValidAtAddress (Address addr)
{
if (!m_plan_valid_address_range.GetBaseAddress().IsValid() || m_plan_valid_address_range.GetByteSize() == 0)
return true;
if (!addr.IsValid())
return true;
if (m_plan_valid_address_range.ContainsFileAddress (addr))
return true;
return false;
}
void
UnwindPlan::Dump (Stream& s, Thread *thread, lldb::addr_t base_addr) const
{
if (!m_source_name.IsEmpty())
{
s.Printf ("This UnwindPlan originally sourced from %s\n", m_source_name.GetCString());
}
if (m_plan_valid_address_range.GetBaseAddress().IsValid() && m_plan_valid_address_range.GetByteSize() > 0)
{
s.PutCString ("Address range of this UnwindPlan: ");
TargetSP target_sp(thread->CalculateTarget());
m_plan_valid_address_range.Dump (&s, target_sp.get(), Address::DumpStyleSectionNameOffset);
s.EOL();
}
collection::const_iterator pos, begin = m_row_list.begin(), end = m_row_list.end();
for (pos = begin; pos != end; ++pos)
{
s.Printf ("row[%u]: ", (uint32_t)std::distance (begin, pos));
(*pos)->Dump(s, this, thread, base_addr);
}
}
void
UnwindPlan::SetSourceName (const char *source)
{
m_source_name = ConstString (source);
}
ConstString
UnwindPlan::GetSourceName () const
{
return m_source_name;
}
const RegisterInfo *
UnwindPlan::GetRegisterInfo (Thread* thread, uint32_t unwind_reg) const
{
if (thread)
{
RegisterContext *reg_ctx = thread->GetRegisterContext().get();
if (reg_ctx)
{
uint32_t reg;
if (m_register_kind == eRegisterKindLLDB)
reg = unwind_reg;
else
reg = reg_ctx->ConvertRegisterKindToRegisterNumber (m_register_kind, unwind_reg);
if (reg != LLDB_INVALID_REGNUM)
return reg_ctx->GetRegisterInfoAtIndex (reg);
}
}
return NULL;
}
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