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//===-- UnwindLLDB.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/Module.h"
#include "lldb/Core/Log.h"
#include "lldb/Symbol/FuncUnwinders.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Target/ArchDefaultUnwindPlan.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "UnwindLLDB.h"
#include "RegisterContextLLDB.h"
using namespace lldb;
using namespace lldb_private;
UnwindLLDB::UnwindLLDB (Thread &thread) :
Unwind (thread),
m_frames()
{
}
uint32_t
UnwindLLDB::GetFrameCount()
{
if (m_frames.empty())
{
//#define DEBUG_FRAME_SPEED 1
#if DEBUG_FRAME_SPEED
#define FRAME_COUNT 10000
TimeValue time_value (TimeValue::Now());
#endif
if (!AddFirstFrame ())
return 0;
while (AddOneMoreFrame ())
{
#if DEBUG_FRAME_SPEED
if ((m_frames.size() % FRAME_COUNT) == 0)
{
TimeValue now(TimeValue::Now());
uint64_t delta_t = now - time_value;
printf ("%u frames in %llu.%09llu ms (%g frames/sec)\n",
FRAME_COUNT,
delta_t / NSEC_PER_SEC,
delta_t % NSEC_PER_SEC,
(float)FRAME_COUNT / ((float)delta_t / (float)NSEC_PER_SEC));
time_value = now;
}
#endif
}
}
return m_frames.size ();
}
bool
UnwindLLDB::AddFirstFrame ()
{
// First, set up the 0th (initial) frame
CursorSP first_cursor_sp(new Cursor ());
std::auto_ptr<RegisterContextLLDB> first_register_ctx_ap (new RegisterContextLLDB (m_thread,
RegisterContextLLDB::SharedPtr(),
first_cursor_sp->sctx,
0));
if (first_register_ctx_ap.get() == NULL)
return false;
if (!first_register_ctx_ap->IsValid())
return false;
if (!first_register_ctx_ap->GetCFA (first_cursor_sp->cfa))
return false;
if (!first_register_ctx_ap->ReadPC (first_cursor_sp->start_pc))
return false;
// Everything checks out, so release the auto pointer value and let the
// cursor own it in its shared pointer
first_cursor_sp->reg_ctx.reset(first_register_ctx_ap.release());
m_frames.push_back (first_cursor_sp);
return true;
}
// For adding a non-zero stack frame to m_frames.
bool
UnwindLLDB::AddOneMoreFrame ()
{
LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND));
CursorSP cursor_sp(new Cursor ());
// Frame zero is a little different
if (m_frames.size() == 0)
return false;
uint32_t cur_idx = m_frames.size ();
std::auto_ptr<RegisterContextLLDB> register_ctx_ap(new RegisterContextLLDB (m_thread,
m_frames[cur_idx - 1]->reg_ctx,
cursor_sp->sctx,
cur_idx));
if (register_ctx_ap.get() == NULL)
return false;
if (!register_ctx_ap->IsValid())
{
if (log)
{
log->Printf("%*sFrame %d invalid RegisterContext for this frame, stopping stack walk",
cur_idx < 100 ? cur_idx : 100, "", cur_idx);
}
return false;
}
if (!register_ctx_ap->GetCFA (cursor_sp->cfa))
{
if (log)
{
log->Printf("%*sFrame %d did not get CFA for this frame, stopping stack walk",
cur_idx < 100 ? cur_idx : 100, "", cur_idx);
}
return false;
}
if (cursor_sp->cfa == (addr_t) -1 || cursor_sp->cfa == 1 || cursor_sp->cfa == 0)
{
if (log)
{
log->Printf("%*sFrame %d did not get a valid CFA for this frame, stopping stack walk",
cur_idx < 100 ? cur_idx : 100, "", cur_idx);
}
return false;
}
if (!register_ctx_ap->ReadPC (cursor_sp->start_pc))
{
if (log)
{
log->Printf("%*sFrame %d did not get PC for this frame, stopping stack walk",
cur_idx < 100 ? cur_idx : 100, "", cur_idx);
}
return false;
}
if (!m_frames.empty())
{
if ((m_frames.back()->start_pc == cursor_sp->start_pc) &&
(m_frames.back()->cfa == cursor_sp->cfa))
{
// Infinite loop where the current cursor is the same as the previous one...
return false;
}
}
RegisterContextLLDB::SharedPtr reg_ctx_sp(register_ctx_ap.release());
cursor_sp->reg_ctx = reg_ctx_sp;
m_frames.push_back (cursor_sp);
return true;
}
bool
UnwindLLDB::GetFrameInfoAtIndex (uint32_t idx, addr_t& cfa, addr_t& pc)
{
if (m_frames.size() == 0)
{
if (!AddFirstFrame())
return false;
}
while (idx >= m_frames.size() && AddOneMoreFrame ())
;
if (idx < m_frames.size ())
{
cfa = m_frames[idx]->cfa;
pc = m_frames[idx]->start_pc;
return true;
}
return false;
}
lldb::RegisterContextSP
UnwindLLDB::CreateRegisterContextForFrame (StackFrame *frame)
{
lldb::RegisterContextSP reg_ctx_sp;
uint32_t idx = frame->GetConcreteFrameIndex ();
if (idx == 0)
{
return m_thread.GetRegisterContext();
}
if (m_frames.size() == 0)
{
if (!AddFirstFrame())
return reg_ctx_sp;
}
while (idx >= m_frames.size() && AddOneMoreFrame ())
;
if (idx < m_frames.size ())
reg_ctx_sp = m_frames[idx]->reg_ctx;
return reg_ctx_sp;
}
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