| //===-- 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/Target/Thread.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Symbol/FuncUnwinders.h" |
| #include "lldb/Symbol/Function.h" |
| #include "lldb/Utility/ArchDefaultUnwindPlan.h" |
| #include "UnwindLLDB.h" |
| #include "lldb/Symbol/UnwindPlan.h" |
| #include "lldb/Core/Log.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 ()); |
| RegisterContextSP no_frame; |
| std::auto_ptr<RegisterContextLLDB> first_register_ctx_ap (new RegisterContextLLDB(m_thread, no_frame, 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; |
| } |
| } |
| RegisterContextSP register_ctx_sp(register_ctx_ap.release()); |
| cursor_sp->reg_ctx = register_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; |
| } |