StackFrameSP StackFrameList::GetFrameAtIndex(uint32_t idx) {
StackFrameSP frame_sp;
std::lock_guard<std::recursive_mutex> guard(m_mutex);
uint32_t original_idx = idx;
uint32_t inlined_depth = GetCurrentInlinedDepth();
if (inlined_depth != UINT32_MAX)
idx += inlined_depth;
if (idx < m_frames.size())
frame_sp = m_frames[idx];
if (frame_sp)
return frame_sp;
// GetFramesUpTo will fill m_frames with as many frames as you asked for,
// if there are that many. If there weren't then you asked for too many
// frames.
GetFramesUpTo(idx);
if (idx < m_frames.size()) {
if (m_show_inlined_frames) {
// When inline frames are enabled we actually create all the frames in
// GetFramesUpTo.
frame_sp = m_frames[idx];
} else {
Unwind *unwinder = m_thread.GetUnwinder();
if (unwinder) {
addr_t pc, cfa;
if (unwinder->GetFrameInfoAtIndex(idx, cfa, pc)) {
const bool cfa_is_valid = true;
const bool stop_id_is_valid = false;
const bool is_history_frame = false;
frame_sp.reset(new StackFrame(
m_thread.shared_from_this(), idx, idx, cfa, cfa_is_valid, pc, 0,
stop_id_is_valid, is_history_frame, nullptr));
Function *function =
frame_sp->GetSymbolContext(eSymbolContextFunction).function;
if (function) {
// When we aren't showing inline functions we always use
// the top most function block as the scope.
frame_sp->SetSymbolContextScope(&function->GetBlock(false));
} else {
// Set the symbol scope from the symbol regardless if it is nullptr
// or valid.
frame_sp->SetSymbolContextScope(
frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol);
}
SetFrameAtIndex(idx, frame_sp);
}
}
}
} else if (original_idx == 0) {
// There should ALWAYS be a frame at index 0. If something went wrong with
// the CurrentInlinedDepth such that
// there weren't as many frames as we thought taking that into account, then
// reset the current inlined depth
// and return the real zeroth frame.
if (m_frames.empty()) {
// Why do we have a thread with zero frames, that should not ever
// happen...
if (m_thread.IsValid())
assert("A valid thread has no frames.");
} else {
ResetCurrentInlinedDepth();
frame_sp = m_frames[original_idx];
}
}
return frame_sp;
}
void StackFrameList::GetFramesUpTo(uint32_t end_idx) {
// this makes sure we do not fetch frames for an invalid thread
if (!m_thread.IsValid())
return;
// We've already gotten more frames than asked for, or we've already finished
// unwinding, return.
if (m_frames.size() > end_idx || GetAllFramesFetched())
return;
Unwind *unwinder = m_thread.GetUnwinder();
if (m_show_inlined_frames) {
#if defined(DEBUG_STACK_FRAMES)
StreamFile s(stdout, false);
#endif
// If we are hiding some frames from the outside world, we need to add those
// onto the total count of
// frames to fetch. However, we don't need to do that if end_idx is 0 since
// in that case we always
// get the first concrete frame and all the inlined frames below it... And
// of course, if end_idx is
// UINT32_MAX that means get all, so just do that...
uint32_t inlined_depth = 0;
if (end_idx > 0 && end_idx != UINT32_MAX) {
inlined_depth = GetCurrentInlinedDepth();
if (inlined_depth != UINT32_MAX) {
if (end_idx > 0)
end_idx += inlined_depth;
}
}
StackFrameSP unwind_frame_sp;
do {
uint32_t idx = m_concrete_frames_fetched++;
lldb::addr_t pc = LLDB_INVALID_ADDRESS;
lldb::addr_t cfa = LLDB_INVALID_ADDRESS;
if (idx == 0) {
// We might have already created frame zero, only create it
// if we need to
if (m_frames.empty()) {
RegisterContextSP reg_ctx_sp(m_thread.GetRegisterContext());
if (reg_ctx_sp) {
const bool success =
unwinder && unwinder->GetFrameInfoAtIndex(idx, cfa, pc);
// There shouldn't be any way not to get the frame info for frame 0.
// But if the unwinder can't make one, lets make one by hand with
// the
// SP as the CFA and see if that gets any further.
if (!success) {
cfa = reg_ctx_sp->GetSP();
pc = reg_ctx_sp->GetPC();
}
unwind_frame_sp.reset(new StackFrame(m_thread.shared_from_this(),
m_frames.size(), idx,
reg_ctx_sp, cfa, pc, nullptr));
m_frames.push_back(unwind_frame_sp);
}
} else {
unwind_frame_sp = m_frames.front();
cfa = unwind_frame_sp->m_id.GetCallFrameAddress();
}
} else {
const bool success =
unwinder && unwinder->GetFrameInfoAtIndex(idx, cfa, pc);
if (!success) {
// We've gotten to the end of the stack.
SetAllFramesFetched();
break;
}
const bool cfa_is_valid = true;
const bool stop_id_is_valid = false;
const bool is_history_frame = false;
unwind_frame_sp.reset(new StackFrame(
m_thread.shared_from_this(), m_frames.size(), idx, cfa,
cfa_is_valid, pc, 0, stop_id_is_valid, is_history_frame, nullptr));
m_frames.push_back(unwind_frame_sp);
}
assert(unwind_frame_sp);
SymbolContext unwind_sc = unwind_frame_sp->GetSymbolContext(
eSymbolContextBlock | eSymbolContextFunction);
Block *unwind_block = unwind_sc.block;
if (unwind_block) {
Address curr_frame_address(unwind_frame_sp->GetFrameCodeAddress());
TargetSP target_sp = m_thread.CalculateTarget();
// Be sure to adjust the frame address to match the address
// that was used to lookup the symbol context above. If we are
// in the first concrete frame, then we lookup using the current
// address, else we decrement the address by one to get the correct
// location.
if (idx > 0) {
if (curr_frame_address.GetOffset() == 0) {
// If curr_frame_address points to the first address in a section
// then after
// adjustment it will point to an other section. In that case
// resolve the
// address again to the correct section plus offset form.
addr_t load_addr = curr_frame_address.GetOpcodeLoadAddress(
target_sp.get(), eAddressClassCode);
curr_frame_address.SetOpcodeLoadAddress(
load_addr - 1, target_sp.get(), eAddressClassCode);
} else {
curr_frame_address.Slide(-1);
}
}
SymbolContext next_frame_sc;
Address next_frame_address;
while (unwind_sc.GetParentOfInlinedScope(
curr_frame_address, next_frame_sc, next_frame_address)) {
next_frame_sc.line_entry.ApplyFileMappings(target_sp);
StackFrameSP frame_sp(
new StackFrame(m_thread.shared_from_this(), m_frames.size(), idx,
unwind_frame_sp->GetRegisterContextSP(), cfa,
next_frame_address, &next_frame_sc));
m_frames.push_back(frame_sp);
unwind_sc = next_frame_sc;
curr_frame_address = next_frame_address;
}
}
} while (m_frames.size() - 1 < end_idx);
// Don't try to merge till you've calculated all the frames in this stack.
if (GetAllFramesFetched() && m_prev_frames_sp) {
StackFrameList *prev_frames = m_prev_frames_sp.get();
StackFrameList *curr_frames = this;
// curr_frames->m_current_inlined_depth = prev_frames->m_current_inlined_depth;
// curr_frames->m_current_inlined_pc = prev_frames->m_current_inlined_pc;
// printf ("GetFramesUpTo: Copying current inlined depth: %d 0x%" PRIx64 ".\n",
// curr_frames->m_current_inlined_depth, curr_frames->m_current_inlined_pc);
#if defined(DEBUG_STACK_FRAMES)
s.PutCString("\nprev_frames:\n");
prev_frames->Dump(&s);
s.PutCString("\ncurr_frames:\n");
curr_frames->Dump(&s);
s.EOL();
#endif
size_t curr_frame_num, prev_frame_num;
for (curr_frame_num = curr_frames->m_frames.size(),
prev_frame_num = prev_frames->m_frames.size();
curr_frame_num > 0 && prev_frame_num > 0;
--curr_frame_num, --prev_frame_num) {
const size_t curr_frame_idx = curr_frame_num - 1;
const size_t prev_frame_idx = prev_frame_num - 1;
StackFrameSP curr_frame_sp(curr_frames->m_frames[curr_frame_idx]);
StackFrameSP prev_frame_sp(prev_frames->m_frames[prev_frame_idx]);
#if defined(DEBUG_STACK_FRAMES)
s.Printf("\n\nCurr frame #%u ", curr_frame_idx);
if (curr_frame_sp)
curr_frame_sp->Dump(&s, true, false);
else
s.PutCString("NULL");
s.Printf("\nPrev frame #%u ", prev_frame_idx);
if (prev_frame_sp)
prev_frame_sp->Dump(&s, true, false);
else
s.PutCString("NULL");
#endif
StackFrame *curr_frame = curr_frame_sp.get();
StackFrame *prev_frame = prev_frame_sp.get();
if (curr_frame == nullptr || prev_frame == nullptr)
break;
// Check the stack ID to make sure they are equal
if (curr_frame->GetStackID() != prev_frame->GetStackID())
break;
prev_frame->UpdatePreviousFrameFromCurrentFrame(*curr_frame);
// Now copy the fixed up previous frame into the current frames
// so the pointer doesn't change
m_frames[curr_frame_idx] = prev_frame_sp;
// curr_frame->UpdateCurrentFrameFromPreviousFrame (*prev_frame);
#if defined(DEBUG_STACK_FRAMES)
s.Printf("\n Copying previous frame to current frame");
#endif
}
// We are done with the old stack frame list, we can release it now
m_prev_frames_sp.reset();
}
#if defined(DEBUG_STACK_FRAMES)
s.PutCString("\n\nNew frames:\n");
Dump(&s);
s.EOL();
#endif
} else {
if (end_idx < m_concrete_frames_fetched)
return;
if (unwinder) {
uint32_t num_frames = unwinder->GetFramesUpTo(end_idx);
if (num_frames <= end_idx + 1) {
// Done unwinding.
m_concrete_frames_fetched = UINT32_MAX;
}
m_frames.resize(num_frames);
}
}
}