| //===-- 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() |
| { |
| LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| if (m_frames.empty()) |
| { |
| // First, set up the 0th (initial) frame |
| CursorSP first_cursor_sp(new Cursor ()); |
| RegisterContextSP no_frame; // an empty shared pointer |
| RegisterContextLLDB *first_register_ctx = new RegisterContextLLDB(m_thread, no_frame, first_cursor_sp->sctx, 0); |
| if (!first_register_ctx->IsValid()) |
| { |
| delete first_register_ctx; |
| return 0; |
| } |
| if (!first_register_ctx->GetCFA (first_cursor_sp->cfa)) |
| { |
| delete first_register_ctx; |
| return 0; |
| } |
| if (!first_register_ctx->GetPC (first_cursor_sp->start_pc)) |
| { |
| delete first_register_ctx; |
| return 0; |
| } |
| // Reuse the StackFrame provided by the processor native machine context for the first frame |
| first_register_ctx->SetStackFrame (m_thread.GetStackFrameAtIndex(0).get()); |
| RegisterContextSP first_register_ctx_sp(first_register_ctx); |
| first_cursor_sp->reg_ctx = first_register_ctx_sp; |
| m_frames.push_back (first_cursor_sp); |
| |
| // Now walk up the rest of the stack |
| while (1) |
| { |
| CursorSP cursor_sp(new Cursor ()); |
| RegisterContextLLDB *register_ctx; |
| uint32_t cur_idx = m_frames.size (); |
| register_ctx = new RegisterContextLLDB (m_thread, m_frames[cur_idx - 1]->reg_ctx, cursor_sp->sctx, cur_idx); |
| if (!register_ctx->IsValid()) |
| { |
| delete register_ctx; |
| if (log) |
| { |
| log->Printf("%*sFrame %d invalid RegisterContext for this frame, stopping stack walk", |
| cur_idx < 100 ? cur_idx : 100, "", cur_idx); |
| } |
| break; |
| } |
| if (!register_ctx->GetCFA (cursor_sp->cfa)) |
| { |
| delete register_ctx; |
| if (log) |
| { |
| log->Printf("%*sFrame %d did not get CFA for this frame, stopping stack walk", |
| cur_idx < 100 ? cur_idx : 100, "", cur_idx); |
| } |
| break; |
| } |
| if (cursor_sp->cfa == (addr_t) -1 || cursor_sp->cfa == 1 || cursor_sp->cfa == 0) |
| { |
| delete register_ctx; |
| 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); |
| } |
| break; |
| } |
| if (!register_ctx->GetPC (cursor_sp->start_pc)) |
| { |
| delete register_ctx; |
| if (log) |
| { |
| log->Printf("%*sFrame %d did not get PC for this frame, stopping stack walk", |
| cur_idx < 100 ? cur_idx : 100, "", cur_idx); |
| } |
| break; |
| } |
| RegisterContextSP register_ctx_sp(register_ctx); |
| StackFrame *frame = new StackFrame(cur_idx, cur_idx, m_thread, register_ctx_sp, cursor_sp->cfa, cursor_sp->start_pc, &(cursor_sp->sctx)); |
| register_ctx->SetStackFrame (frame); |
| cursor_sp->reg_ctx = register_ctx_sp; |
| m_frames.push_back (cursor_sp); |
| } |
| } |
| return m_frames.size (); |
| } |
| |
| bool |
| UnwindLLDB::GetFrameInfoAtIndex (uint32_t idx, addr_t& cfa, addr_t& pc) |
| { |
| // FIXME don't get the entire stack if it isn't needed. |
| if (m_frames.size() == 0) |
| GetFrameCount(); |
| |
| if (idx < m_frames.size ()) |
| { |
| cfa = m_frames[idx]->cfa; |
| pc = m_frames[idx]->start_pc; |
| return true; |
| } |
| return false; |
| } |
| |
| RegisterContext * |
| UnwindLLDB::CreateRegisterContextForFrame (StackFrame *frame) |
| { |
| uint32_t idx = frame->GetFrameIndex (); |
| |
| // FIXME don't get the entire stack if it isn't needed. |
| if (m_frames.size() == 0) |
| GetFrameCount(); |
| |
| if (idx == 0) |
| { |
| return m_thread.GetRegisterContext(); |
| } |
| if (idx < m_frames.size ()) |
| return m_frames[idx]->reg_ctx.get(); |
| return NULL; |
| } |