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//===-- HistoryUnwind.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/lldb-private.h"
#include "Plugins/Process/Utility/HistoryUnwind.h"
#include "Plugins/Process/Utility/RegisterContextHistory.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include <memory>
using namespace lldb;
using namespace lldb_private;
// Constructor
HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
HistoryPCType pc_type)
: Unwind(thread), m_pcs(pcs), m_pc_type(pc_type) {}
// Destructor
HistoryUnwind::~HistoryUnwind() = default;
void HistoryUnwind::DoClear() {
std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
m_pcs.clear();
}
lldb::RegisterContextSP
HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) {
RegisterContextSP rctx;
if (frame) {
addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress(
&frame->GetThread()->GetProcess()->GetTarget());
if (pc != LLDB_INVALID_ADDRESS) {
rctx = std::make_shared<RegisterContextHistory>(
*frame->GetThread().get(), frame->GetConcreteFrameIndex(),
frame->GetThread()->GetProcess()->GetAddressByteSize(), pc);
}
}
return rctx;
}
static bool BehavesLikeZerothFrame(HistoryPCType pc_type, uint32_t frame_idx) {
switch (pc_type) {
case HistoryPCType::Returns:
return (frame_idx == 0);
case HistoryPCType::ReturnsNoZerothFrame:
return false;
case HistoryPCType::Calls:
return true;
}
llvm_unreachable("Fully covered switch above");
}
bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
lldb::addr_t &pc,
bool &behaves_like_zeroth_frame) {
// FIXME do not throw away the lock after we acquire it..
std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex);
guard.unlock();
if (frame_idx < m_pcs.size()) {
cfa = frame_idx;
pc = m_pcs[frame_idx];
behaves_like_zeroth_frame = BehavesLikeZerothFrame(m_pc_type, frame_idx);
return true;
}
return false;
}
uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); }
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