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

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//===-- StackFrameList.cpp ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Target/StackFrameList.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/SourceManager.h"
#include "lldb/Core/StreamFile.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"
#include "lldb/Utility/Log.h"
#include "llvm/ADT/SmallPtrSet.h"
#include <memory>
//#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(), 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())
LLDB_LOGF(
log,
"GetCurrentInlinedDepth: invalidating current inlined depth.\n");
}
return m_current_inlined_depth;
} else {
return UINT32_MAX;
}
}
void StackFrameList::ResetCurrentInlinedDepth() {
if (!m_show_inlined_frames)
return;
std::lock_guard<std::recursive_mutex> guard(m_mutex);
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())
LLDB_LOGF(
log,
"ResetCurrentInlinedDepth: Invalidating current inlined depth.\n");
return;
}
// 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.
Block *block_ptr = m_frames[0]->GetFrameBlock();
if (!block_ptr)
return;
Address pc_as_address;
lldb::addr_t curr_pc = m_thread.GetRegisterContext()->GetPC();
pc_as_address.SetLoadAddress(curr_pc, &(m_thread.GetProcess()->GetTarget()));
AddressRange containing_range;
if (!block_ptr->GetRangeContainingAddress(pc_as_address, containing_range) ||
pc_as_address != containing_range.GetBaseAddress())
return;
// 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)
return;
switch (stop_info_sp->GetStopReason()) {
case eStopReasonWatchpoint:
case eStopReasonException:
case eStopReasonExec:
case eStopReasonSignal:
// In all these cases we want to stop in the deepest 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())
LLDB_LOGF(log,
"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::GetOnlyConcreteFramesUpTo(uint32_t end_idx,
Unwind &unwinder) {
assert(m_thread.IsValid() && "Expected valid thread");
assert(m_frames.size() <= end_idx && "Expected there to be frames to fill");
if (end_idx < m_concrete_frames_fetched)
return;
uint32_t num_frames = unwinder.GetFramesUpTo(end_idx);
if (num_frames <= end_idx + 1) {
// Done unwinding.
m_concrete_frames_fetched = UINT32_MAX;
}
// Don't create the frames eagerly. Defer this work to GetFrameAtIndex,
// which can lazily query the unwinder to create frames.
m_frames.resize(num_frames);
}
/// A sequence of calls that comprise some portion of a backtrace. Each frame
/// is represented as a pair of a callee (Function *) and an address within the
/// callee.
struct CallDescriptor {
Function *func;
CallEdge::AddrType address_type = CallEdge::AddrType::Call;
addr_t address = LLDB_INVALID_ADDRESS;
};
using CallSequence = std::vector<CallDescriptor>;
/// Find the unique path through the call graph from \p begin (with return PC
/// \p return_pc) to \p end. On success this path is stored into \p path, and
/// on failure \p path is unchanged.
static void FindInterveningFrames(Function &begin, Function &end,
ExecutionContext &exe_ctx, Target &target,
addr_t return_pc, CallSequence &path,
ModuleList &images, Log *log) {
LLDB_LOG(log, "Finding frames between {0} and {1}, retn-pc={2:x}",
begin.GetDisplayName(), end.GetDisplayName(), return_pc);
// Find a non-tail calling edge with the correct return PC.
if (log)
for (const auto &edge : begin.GetCallEdges())
LLDB_LOG(log, "FindInterveningFrames: found call with retn-PC = {0:x}",
edge->GetReturnPCAddress(begin, target));
CallEdge *first_edge = begin.GetCallEdgeForReturnAddress(return_pc, target);
if (!first_edge) {
LLDB_LOG(log, "No call edge outgoing from {0} with retn-PC == {1:x}",
begin.GetDisplayName(), return_pc);
return;
}
// The first callee may not be resolved, or there may be nothing to fill in.
Function *first_callee = first_edge->GetCallee(images, exe_ctx);
if (!first_callee) {
LLDB_LOG(log, "Could not resolve callee");
return;
}
if (first_callee == &end) {
LLDB_LOG(log, "Not searching further, first callee is {0} (retn-PC: {1:x})",
end.GetDisplayName(), return_pc);
return;
}
// Run DFS on the tail-calling edges out of the first callee to find \p end.
// Fully explore the set of functions reachable from the first edge via tail
// calls in order to detect ambiguous executions.
struct DFS {
CallSequence active_path = {};
CallSequence solution_path = {};
llvm::SmallPtrSet<Function *, 2> visited_nodes = {};
bool ambiguous = false;
Function *end;
ModuleList &images;
Target &target;
ExecutionContext &context;
DFS(Function *end, ModuleList &images, Target &target,
ExecutionContext &context)
: end(end), images(images), target(target), context(context) {}
void search(CallEdge &first_edge, Function &first_callee,
CallSequence &path) {
dfs(first_edge, first_callee);
if (!ambiguous)
path = std::move(solution_path);
}
void dfs(CallEdge &current_edge, Function &callee) {
// Found a path to the target function.
if (&callee == end) {
if (solution_path.empty())
solution_path = active_path;
else
ambiguous = true;
return;
}
// Terminate the search if tail recursion is found, or more generally if
// there's more than one way to reach a target. This errs on the side of
// caution: it conservatively stops searching when some solutions are
// still possible to save time in the average case.
if (!visited_nodes.insert(&callee).second) {
ambiguous = true;
return;
}
// Search the calls made from this callee.
active_path.push_back(CallDescriptor{&callee});
for (const auto &edge : callee.GetTailCallingEdges()) {
Function *next_callee = edge->GetCallee(images, context);
if (!next_callee)
continue;
std::tie(active_path.back().address_type, active_path.back().address) =
edge->GetCallerAddress(callee, target);
dfs(*edge, *next_callee);
if (ambiguous)
return;
}
active_path.pop_back();
}
};
DFS(&end, images, target, exe_ctx).search(*first_edge, *first_callee, path);
}
/// Given that \p next_frame will be appended to the frame list, synthesize
/// tail call frames between the current end of the list and \p next_frame.
/// If any frames are added, adjust the frame index of \p next_frame.
///
/// --------------
/// | ... | <- Completed frames.
/// --------------
/// | prev_frame |
/// --------------
/// | ... | <- Artificial frames inserted here.
/// --------------
/// | next_frame |
/// --------------
/// | ... | <- Not-yet-visited frames.
/// --------------
void StackFrameList::SynthesizeTailCallFrames(StackFrame &next_frame) {
// Cannot synthesize tail call frames when the stack is empty (there is no
// "previous" frame).
if (m_frames.empty())
return;
TargetSP target_sp = next_frame.CalculateTarget();
if (!target_sp)
return;
lldb::RegisterContextSP next_reg_ctx_sp = next_frame.GetRegisterContext();
if (!next_reg_ctx_sp)
return;
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
StackFrame &prev_frame = *m_frames.back().get();
// Find the functions prev_frame and next_frame are stopped in. The function
// objects are needed to search the lazy call graph for intervening frames.
Function *prev_func =
prev_frame.GetSymbolContext(eSymbolContextFunction).function;
if (!prev_func) {
LLDB_LOG(log, "SynthesizeTailCallFrames: can't find previous function");
return;
}
Function *next_func =
next_frame.GetSymbolContext(eSymbolContextFunction).function;
if (!next_func) {
LLDB_LOG(log, "SynthesizeTailCallFrames: can't find next function");
return;
}
// Try to find the unique sequence of (tail) calls which led from next_frame
// to prev_frame.
CallSequence path;
addr_t return_pc = next_reg_ctx_sp->GetPC();
Target &target = *target_sp.get();
ModuleList &images = next_frame.CalculateTarget()->GetImages();
ExecutionContext exe_ctx(target_sp, /*get_process=*/true);
exe_ctx.SetFramePtr(&next_frame);
FindInterveningFrames(*next_func, *prev_func, exe_ctx, target, return_pc,
path, images, log);
// Push synthetic tail call frames.
for (auto calleeInfo : llvm::reverse(path)) {
Function *callee = calleeInfo.func;
uint32_t frame_idx = m_frames.size();
uint32_t concrete_frame_idx = next_frame.GetConcreteFrameIndex();
addr_t cfa = LLDB_INVALID_ADDRESS;
bool cfa_is_valid = false;
addr_t pc = calleeInfo.address;
// If the callee address refers to the call instruction, we do not want to
// subtract 1 from this value.
const bool behaves_like_zeroth_frame =
calleeInfo.address_type == CallEdge::AddrType::Call;
SymbolContext sc;
callee->CalculateSymbolContext(&sc);
auto synth_frame = std::make_shared<StackFrame>(
m_thread.shared_from_this(), frame_idx, concrete_frame_idx, cfa,
cfa_is_valid, pc, StackFrame::Kind::Artificial,
behaves_like_zeroth_frame, &sc);
m_frames.push_back(synth_frame);
LLDB_LOG(log, "Pushed frame {0} at {1:x}", callee->GetDisplayName(), pc);
}
// If any frames were created, adjust next_frame's index.
if (!path.empty())
next_frame.SetFrameIndex(m_frames.size());
}
void StackFrameList::GetFramesUpTo(uint32_t end_idx) {
// 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) {
GetOnlyConcreteFramesUpTo(end_idx, unwinder);
return;
}
#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;
bool behaves_like_zeroth_frame = (idx == 0);
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.GetFrameInfoAtIndex(
idx, cfa, pc, behaves_like_zeroth_frame);
// 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 = std::make_shared<StackFrame>(
m_thread.shared_from_this(), m_frames.size(), idx, reg_ctx_sp,
cfa, pc, behaves_like_zeroth_frame, 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.GetFrameInfoAtIndex(idx, cfa, pc, behaves_like_zeroth_frame);
if (!success) {
// We've gotten to the end of the stack.
SetAllFramesFetched();
break;
}
const bool cfa_is_valid = true;
unwind_frame_sp = std::make_shared<StackFrame>(
m_thread.shared_from_this(), m_frames.size(), idx, cfa, cfa_is_valid,
pc, StackFrame::Kind::Regular, behaves_like_zeroth_frame, nullptr);
// Create synthetic tail call frames between the previous frame and the
// newly-found frame. The new frame's index may change after this call,
// although its concrete index will stay the same.
SynthesizeTailCallFrames(*unwind_frame_sp.get());
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(), AddressClass::eCode);
curr_frame_address.SetOpcodeLoadAddress(
load_addr - 1, target_sp.get(), AddressClass::eCode);
} 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);
behaves_like_zeroth_frame = false;
StackFrameSP frame_sp(new StackFrame(
m_thread.shared_from_this(), m_frames.size(), idx,
unwind_frame_sp->GetRegisterContextSP(), cfa, next_frame_address,
behaves_like_zeroth_frame, &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;
#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;
#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
}
uint32_t StackFrameList::GetNumFrames(bool can_create) {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
if (can_create)
GetFramesUpTo(UINT32_MAX);
return GetVisibleStackFrameIndex(m_frames.size());
}
void StackFrameList::Dump(Stream *s) {
if (s == nullptr)
return;
std::lock_guard<std::recursive_mutex> guard(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;
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 {
addr_t pc, cfa;
bool behaves_like_zeroth_frame = (idx == 0);
if (m_thread.GetUnwinder().GetFrameInfoAtIndex(
idx, cfa, pc, behaves_like_zeroth_frame)) {
const bool cfa_is_valid = true;
frame_sp = std::make_shared<StackFrame>(
m_thread.shared_from_this(), idx, idx, cfa, cfa_is_valid, pc,
StackFrame::Kind::Regular, behaves_like_zeroth_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...
assert(!m_thread.IsValid() && "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()) {
std::lock_guard<std::recursive_mutex> guard(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;
}
}
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 {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return m_selected_frame_idx;
}
uint32_t StackFrameList::SetSelectedFrame(lldb_private::StackFrame *frame) {
std::lock_guard<std::recursive_mutex> guard(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;
}
bool StackFrameList::SetSelectedFrameByIndex(uint32_t idx) {
std::lock_guard<std::recursive_mutex> guard(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() {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
m_frames.clear();
m_concrete_frames_fetched = 0;
}
void StackFrameList::Merge(std::unique_ptr<StackFrameList> &curr_up,
lldb::StackFrameListSP &prev_sp) {
std::unique_lock<std::recursive_mutex> current_lock, previous_lock;
if (curr_up)
current_lock = std::unique_lock<std::recursive_mutex>(curr_up->m_mutex);
if (prev_sp)
previous_lock = std::unique_lock<std::recursive_mutex>(prev_sp->m_mutex);
#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_up)
curr_up->Dump(&s);
else
s.PutCString("NULL");
s.EOL();
#endif
if (!curr_up || curr_up->GetNumFrames(false) == 0) {
#if defined(DEBUG_STACK_FRAMES)
s.PutCString("No current frames, leave previous frames alone...\n");
#endif
curr_up.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_up.release());
return;
}
const uint32_t num_curr_frames = curr_up->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_up.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_up->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_up.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,
bool show_unique,
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),
show_unique, marker))
break;
++num_frames_displayed;
}
strm.IndentLess();
return num_frames_displayed;
}
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