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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/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())
{
if (!AddFirstFrame ())
return 0;
while (AddOneMoreFrame ())
;
}
return m_frames.size ();
}
bool
UnwindLLDB::AddFirstFrame ()
{
// First, set up the 0th (initial) frame
CursorSP first_cursor_sp(new Cursor ());
RegisterContextSP no_frame;
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 false;
}
if (!first_register_ctx->GetCFA (first_cursor_sp->cfa))
{
delete first_register_ctx;
return false;
}
if (!first_register_ctx->GetPC (first_cursor_sp->start_pc))
{
delete first_register_ctx;
return false;
}
// 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);
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 ());
RegisterContextLLDB *register_ctx;
// Frame zero is a little different
if (m_frames.size() == 0)
return false;
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);
}
return false;
}
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);
}
return false;
}
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);
}
return false;
}
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);
}
return false;
}
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 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;
}
RegisterContext *
UnwindLLDB::CreateRegisterContextForFrame (StackFrame *frame)
{
uint32_t idx = frame->GetFrameIndex ();
if (idx == 0)
{
return m_thread.GetRegisterContext();
}
if (m_frames.size() == 0)
{
if (!AddFirstFrame())
return NULL;
}
while (idx >= m_frames.size() && AddOneMoreFrame ())
;
if (idx < m_frames.size ())
return m_frames[idx]->reg_ctx.get();
return NULL;
}
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