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llvm-project/lldb/source/Target/StackFrameList.cpp

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//===-- StackFrameList.cpp --------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Target/StackFrameList.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/SourceManager.h"
#include "lldb/Symbol/Block.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/Unwind.h"
//#define DEBUG_STACK_FRAMES 1
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// StackFrameList constructor
//----------------------------------------------------------------------
StackFrameList::StackFrameList
(
Thread &thread,
const lldb::StackFrameListSP &prev_frames_sp,
bool show_inline_frames
) :
m_thread (thread),
m_prev_frames_sp (prev_frames_sp),
m_mutex (Mutex::eMutexTypeRecursive),
m_frames (),
m_selected_frame_idx (0),
m_concrete_frames_fetched (0),
m_current_inlined_depth (UINT32_MAX),
m_current_inlined_pc (LLDB_INVALID_ADDRESS),
m_show_inlined_frames (show_inline_frames)
{
if (prev_frames_sp)
{
m_current_inlined_depth = prev_frames_sp->m_current_inlined_depth;
m_current_inlined_pc = prev_frames_sp->m_current_inlined_pc;
}
}
StackFrameList::~StackFrameList()
{
// Call clear since this takes a lock and clears the stack frame list
// in case another thread is currently using this stack frame list
Clear();
}
void
StackFrameList::CalculateCurrentInlinedDepth()
{
uint32_t cur_inlined_depth = GetCurrentInlinedDepth();
if (cur_inlined_depth == UINT32_MAX)
{
ResetCurrentInlinedDepth();
}
}
uint32_t
StackFrameList::GetCurrentInlinedDepth ()
{
if (m_show_inlined_frames && m_current_inlined_pc != LLDB_INVALID_ADDRESS)
{
lldb::addr_t cur_pc = m_thread.GetRegisterContext()->GetPC();
if (cur_pc != m_current_inlined_pc)
{
m_current_inlined_pc = LLDB_INVALID_ADDRESS;
m_current_inlined_depth = UINT32_MAX;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log && log->GetVerbose())
log->Printf ("GetCurrentInlinedDepth: invalidating current inlined depth.\n");
}
return m_current_inlined_depth;
}
else
{
return UINT32_MAX;
}
}
void
StackFrameList::ResetCurrentInlinedDepth ()
{
Mutex::Locker locker (m_mutex);
if (m_show_inlined_frames)
{
GetFramesUpTo(0);
if (m_frames.empty())
return;
if (!m_frames[0]->IsInlined())
{
m_current_inlined_depth = UINT32_MAX;
m_current_inlined_pc = LLDB_INVALID_ADDRESS;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log && log->GetVerbose())
log->Printf ("ResetCurrentInlinedDepth: Invalidating current inlined depth.\n");
}
else
{
// We only need to do something special about inlined blocks when we
// are at the beginning of an inlined function:
// FIXME: We probably also have to do something special if the PC is at the END
// of an inlined function, which coincides with the end of either its containing
// function or another inlined function.
lldb::addr_t curr_pc = m_thread.GetRegisterContext()->GetPC();
Block *block_ptr = m_frames[0]->GetFrameBlock();
if (block_ptr)
{
Address pc_as_address;
pc_as_address.SetLoadAddress(curr_pc, &(m_thread.GetProcess()->GetTarget()));
AddressRange containing_range;
if (block_ptr->GetRangeContainingAddress(pc_as_address, containing_range))
{
if (pc_as_address == containing_range.GetBaseAddress())
{
// If we got here because of a breakpoint hit, then set the inlined depth depending on where
// the breakpoint was set.
// If we got here because of a crash, then set the inlined depth to the deepest most block.
// Otherwise, we stopped here naturally as the result of a step, so set ourselves in the
// containing frame of the whole set of nested inlines, so the user can then "virtually"
// step into the frames one by one, or next over the whole mess.
// Note: We don't have to handle being somewhere in the middle of the stack here, since
// ResetCurrentInlinedDepth doesn't get called if there is a valid inlined depth set.
StopInfoSP stop_info_sp = m_thread.GetStopInfo();
if (stop_info_sp)
{
switch (stop_info_sp->GetStopReason())
{
case eStopReasonWatchpoint:
case eStopReasonException:
case eStopReasonExec:
case eStopReasonSignal:
// In all these cases we want to stop in the deepest most frame.
m_current_inlined_pc = curr_pc;
m_current_inlined_depth = 0;
break;
case eStopReasonBreakpoint:
{
// FIXME: Figure out what this break point is doing, and set the inline depth
// appropriately. Be careful to take into account breakpoints that implement
// step over prologue, since that should do the default calculation.
// For now, if the breakpoints corresponding to this hit are all internal,
// I set the stop location to the top of the inlined stack, since that will make
// things like stepping over prologues work right. But if there are any non-internal
// breakpoints I do to the bottom of the stack, since that was the old behavior.
uint32_t bp_site_id = stop_info_sp->GetValue();
BreakpointSiteSP bp_site_sp(m_thread.GetProcess()->GetBreakpointSiteList().FindByID(bp_site_id));
bool all_internal = true;
if (bp_site_sp)
{
uint32_t num_owners = bp_site_sp->GetNumberOfOwners();
for (uint32_t i = 0; i < num_owners; i++)
{
Breakpoint &bp_ref = bp_site_sp->GetOwnerAtIndex(i)->GetBreakpoint();
if (!bp_ref.IsInternal())
{
all_internal = false;
}
}
}
if (!all_internal)
{
m_current_inlined_pc = curr_pc;
m_current_inlined_depth = 0;
break;
}
}
LLVM_FALLTHROUGH;
default:
{
// Otherwise, we should set ourselves at the container of the inlining, so that the
// user can descend into them.
// So first we check whether we have more than one inlined block sharing this PC:
int num_inlined_functions = 0;
for (Block *container_ptr = block_ptr->GetInlinedParent();
container_ptr != nullptr;
container_ptr = container_ptr->GetInlinedParent())
{
if (!container_ptr->GetRangeContainingAddress(pc_as_address, containing_range))
break;
if (pc_as_address != containing_range.GetBaseAddress())
break;
num_inlined_functions++;
}
m_current_inlined_pc = curr_pc;
m_current_inlined_depth = num_inlined_functions + 1;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log && log->GetVerbose())
log->Printf ("ResetCurrentInlinedDepth: setting inlined depth: %d 0x%" PRIx64 ".\n", m_current_inlined_depth, curr_pc);
}
break;
}
}
}
}
}
}
}
}
bool
StackFrameList::DecrementCurrentInlinedDepth ()
{
if (m_show_inlined_frames)
{
uint32_t current_inlined_depth = GetCurrentInlinedDepth();
if (current_inlined_depth != UINT32_MAX)
{
if (current_inlined_depth > 0)
{
m_current_inlined_depth--;
return true;
}
}
}
return false;
}
void
StackFrameList::SetCurrentInlinedDepth (uint32_t new_depth)
{
m_current_inlined_depth = new_depth;
if (new_depth == UINT32_MAX)
m_current_inlined_pc = LLDB_INVALID_ADDRESS;
else
m_current_inlined_pc = m_thread.GetRegisterContext()->GetPC();
}
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());
// 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.
TargetSP target = m_thread.CalculateTarget();
addr_t load_addr = curr_frame_address.GetOpcodeLoadAddress(target.get(), eAddressClassCode);
curr_frame_address.SetOpcodeLoadAddress(load_addr - 1, target.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))
{
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);
}
}
}
uint32_t
StackFrameList::GetNumFrames (bool can_create)
{
Mutex::Locker locker (m_mutex);
if (can_create)
GetFramesUpTo (UINT32_MAX);
uint32_t inlined_depth = GetCurrentInlinedDepth();
if (inlined_depth == UINT32_MAX)
return m_frames.size();
else
return m_frames.size() - inlined_depth;
}
void
StackFrameList::Dump (Stream *s)
{
if (s == nullptr)
return;
Mutex::Locker locker (m_mutex);
const_iterator pos, begin = m_frames.begin(), end = m_frames.end();
for (pos = begin; pos != end; ++pos)
{
StackFrame *frame = (*pos).get();
s->Printf("%p: ", static_cast<void*>(frame));
if (frame)
{
frame->GetStackID().Dump (s);
frame->DumpUsingSettingsFormat (s);
}
else
s->Printf("frame #%u", (uint32_t)std::distance (begin, pos));
s->EOL();
}
s->EOL();
}
StackFrameSP
StackFrameList::GetFrameAtIndex (uint32_t idx)
{
StackFrameSP frame_sp;
Mutex::Locker locker (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;
}
StackFrameSP
StackFrameList::GetFrameWithConcreteFrameIndex (uint32_t unwind_idx)
{
// First try assuming the unwind index is the same as the frame index. The
// unwind index is always greater than or equal to the frame index, so it
// is a good place to start. If we have inlined frames we might have 5
// concrete frames (frame unwind indexes go from 0-4), but we might have 15
// frames after we make all the inlined frames. Most of the time the unwind
// frame index (or the concrete frame index) is the same as the frame index.
uint32_t frame_idx = unwind_idx;
StackFrameSP frame_sp (GetFrameAtIndex (frame_idx));
while (frame_sp)
{
if (frame_sp->GetFrameIndex() == unwind_idx)
break;
frame_sp = GetFrameAtIndex (++frame_idx);
}
return frame_sp;
}
static bool
CompareStackID (const StackFrameSP &stack_sp, const StackID &stack_id)
{
return stack_sp->GetStackID() < stack_id;
}
StackFrameSP
StackFrameList::GetFrameWithStackID (const StackID &stack_id)
{
StackFrameSP frame_sp;
if (stack_id.IsValid())
{
Mutex::Locker locker (m_mutex);
uint32_t frame_idx = 0;
// Do a binary search in case the stack frame is already in our cache
collection::const_iterator begin = m_frames.begin();
collection::const_iterator end = m_frames.end();
if (begin != end)
{
collection::const_iterator pos = std::lower_bound (begin, end, stack_id, CompareStackID);
if (pos != end)
{
if ((*pos)->GetStackID() == stack_id)
return *pos;
}
// if (m_frames.back()->GetStackID() < stack_id)
// frame_idx = m_frames.size();
}
do
{
frame_sp = GetFrameAtIndex (frame_idx);
if (frame_sp && frame_sp->GetStackID() == stack_id)
break;
frame_idx++;
}
while (frame_sp);
}
return frame_sp;
}
bool
StackFrameList::SetFrameAtIndex (uint32_t idx, StackFrameSP &frame_sp)
{
if (idx >= m_frames.size())
m_frames.resize(idx + 1);
// Make sure allocation succeeded by checking bounds again
if (idx < m_frames.size())
{
m_frames[idx] = frame_sp;
return true;
}
return false; // resize failed, out of memory?
}
uint32_t
StackFrameList::GetSelectedFrameIndex () const
{
Mutex::Locker locker (m_mutex);
return m_selected_frame_idx;
}
uint32_t
StackFrameList::SetSelectedFrame (lldb_private::StackFrame *frame)
{
Mutex::Locker locker (m_mutex);
const_iterator pos;
const_iterator begin = m_frames.begin();
const_iterator end = m_frames.end();
m_selected_frame_idx = 0;
for (pos = begin; pos != end; ++pos)
{
if (pos->get() == frame)
{
m_selected_frame_idx = std::distance (begin, pos);
uint32_t inlined_depth = GetCurrentInlinedDepth();
if (inlined_depth != UINT32_MAX)
m_selected_frame_idx -= inlined_depth;
break;
}
}
SetDefaultFileAndLineToSelectedFrame();
return m_selected_frame_idx;
}
// Mark a stack frame as the current frame using the frame index
bool
StackFrameList::SetSelectedFrameByIndex (uint32_t idx)
{
Mutex::Locker locker (m_mutex);
StackFrameSP frame_sp (GetFrameAtIndex (idx));
if (frame_sp)
{
SetSelectedFrame(frame_sp.get());
return true;
}
else
return false;
}
void
StackFrameList::SetDefaultFileAndLineToSelectedFrame()
{
if (m_thread.GetID() == m_thread.GetProcess()->GetThreadList().GetSelectedThread()->GetID())
{
StackFrameSP frame_sp (GetFrameAtIndex (GetSelectedFrameIndex()));
if (frame_sp)
{
SymbolContext sc = frame_sp->GetSymbolContext(eSymbolContextLineEntry);
if (sc.line_entry.file)
m_thread.CalculateTarget()->GetSourceManager().SetDefaultFileAndLine (sc.line_entry.file,
sc.line_entry.line);
}
}
}
// The thread has been run, reset the number stack frames to zero so we can
// determine how many frames we have lazily.
void
StackFrameList::Clear ()
{
Mutex::Locker locker (m_mutex);
m_frames.clear();
m_concrete_frames_fetched = 0;
}
void
StackFrameList::InvalidateFrames (uint32_t start_idx)
{
Mutex::Locker locker (m_mutex);
if (m_show_inlined_frames)
{
Clear();
}
else
{
const size_t num_frames = m_frames.size();
while (start_idx < num_frames)
{
m_frames[start_idx].reset();
++start_idx;
}
}
}
void
StackFrameList::Merge (std::unique_ptr<StackFrameList>& curr_ap, lldb::StackFrameListSP& prev_sp)
{
Mutex::Locker curr_locker(curr_ap ? &curr_ap->m_mutex : nullptr);
Mutex::Locker prev_locker(prev_sp ? &prev_sp->m_mutex : nullptr);
#if defined (DEBUG_STACK_FRAMES)
StreamFile s(stdout, false);
s.PutCString("\n\nStackFrameList::Merge():\nPrev:\n");
if (prev_sp)
prev_sp->Dump (&s);
else
s.PutCString ("NULL");
s.PutCString("\nCurr:\n");
if (curr_ap)
curr_ap->Dump (&s);
else
s.PutCString ("NULL");
s.EOL();
#endif
if (!curr_ap || curr_ap->GetNumFrames(false) == 0)
{
#if defined (DEBUG_STACK_FRAMES)
s.PutCString("No current frames, leave previous frames alone...\n");
#endif
curr_ap.release();
return;
}
if (!prev_sp || prev_sp->GetNumFrames(false) == 0)
{
#if defined (DEBUG_STACK_FRAMES)
s.PutCString("No previous frames, so use current frames...\n");
#endif
// We either don't have any previous frames, or since we have more than
// one current frames it means we have all the frames and can safely
// replace our previous frames.
prev_sp.reset (curr_ap.release());
return;
}
const uint32_t num_curr_frames = curr_ap->GetNumFrames (false);
if (num_curr_frames > 1)
{
#if defined (DEBUG_STACK_FRAMES)
s.PutCString("We have more than one current frame, so use current frames...\n");
#endif
// We have more than one current frames it means we have all the frames
// and can safely replace our previous frames.
prev_sp.reset (curr_ap.release());
#if defined (DEBUG_STACK_FRAMES)
s.PutCString("\nMerged:\n");
prev_sp->Dump (&s);
#endif
return;
}
StackFrameSP prev_frame_zero_sp(prev_sp->GetFrameAtIndex (0));
StackFrameSP curr_frame_zero_sp(curr_ap->GetFrameAtIndex (0));
StackID curr_stack_id (curr_frame_zero_sp->GetStackID());
StackID prev_stack_id (prev_frame_zero_sp->GetStackID());
#if defined (DEBUG_STACK_FRAMES)
const uint32_t num_prev_frames = prev_sp->GetNumFrames (false);
s.Printf("\n%u previous frames with one current frame\n", num_prev_frames);
#endif
// We have only a single current frame
// Our previous stack frames only had a single frame as well...
if (curr_stack_id == prev_stack_id)
{
#if defined (DEBUG_STACK_FRAMES)
s.Printf("\nPrevious frame #0 is same as current frame #0, merge the cached data\n");
#endif
curr_frame_zero_sp->UpdateCurrentFrameFromPreviousFrame (*prev_frame_zero_sp);
// prev_frame_zero_sp->UpdatePreviousFrameFromCurrentFrame (*curr_frame_zero_sp);
// prev_sp->SetFrameAtIndex (0, prev_frame_zero_sp);
}
else if (curr_stack_id < prev_stack_id)
{
#if defined (DEBUG_STACK_FRAMES)
s.Printf("\nCurrent frame #0 has a stack ID that is less than the previous frame #0, insert current frame zero in front of previous\n");
#endif
prev_sp->m_frames.insert (prev_sp->m_frames.begin(), curr_frame_zero_sp);
}
curr_ap.release();
#if defined (DEBUG_STACK_FRAMES)
s.PutCString("\nMerged:\n");
prev_sp->Dump (&s);
#endif
}
lldb::StackFrameSP
StackFrameList::GetStackFrameSPForStackFramePtr (StackFrame *stack_frame_ptr)
{
const_iterator pos;
const_iterator begin = m_frames.begin();
const_iterator end = m_frames.end();
lldb::StackFrameSP ret_sp;
for (pos = begin; pos != end; ++pos)
{
if (pos->get() == stack_frame_ptr)
{
ret_sp = (*pos);
break;
}
}
return ret_sp;
}
size_t
StackFrameList::GetStatus (Stream& strm,
uint32_t first_frame,
uint32_t num_frames,
bool show_frame_info,
uint32_t num_frames_with_source,
const char *selected_frame_marker)
{
size_t num_frames_displayed = 0;
if (num_frames == 0)
return 0;
StackFrameSP frame_sp;
uint32_t frame_idx = 0;
uint32_t last_frame;
// Don't let the last frame wrap around...
if (num_frames == UINT32_MAX)
last_frame = UINT32_MAX;
else
last_frame = first_frame + num_frames;
StackFrameSP selected_frame_sp = m_thread.GetSelectedFrame();
const char *unselected_marker = nullptr;
std::string buffer;
if (selected_frame_marker)
{
size_t len = strlen(selected_frame_marker);
buffer.insert(buffer.begin(), len, ' ');
unselected_marker = buffer.c_str();
}
const char *marker = nullptr;
for (frame_idx = first_frame; frame_idx < last_frame; ++frame_idx)
{
frame_sp = GetFrameAtIndex(frame_idx);
if (!frame_sp)
break;
if (selected_frame_marker != nullptr)
{
if (frame_sp == selected_frame_sp)
marker = selected_frame_marker;
else
marker = unselected_marker;
}
if (!frame_sp->GetStatus (strm,
show_frame_info,
num_frames_with_source > (first_frame - frame_idx), marker))
break;
++num_frames_displayed;
}
strm.IndentLess();
return num_frames_displayed;
}
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