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//===-- HistoryUnwind.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/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"
using namespace lldb;
using namespace lldb_private;
// Constructor
HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
bool stop_id_is_valid)
: Unwind(thread), m_pcs(pcs), m_stop_id_is_valid(stop_id_is_valid) {}
// Destructor
HistoryUnwind::~HistoryUnwind() {}
void HistoryUnwind::DoClear() {
std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
m_pcs.clear();
m_stop_id_is_valid = false;
}
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.reset(new RegisterContextHistory(
*frame->GetThread().get(), frame->GetConcreteFrameIndex(),
frame->GetThread()->GetProcess()->GetAddressByteSize(), pc));
}
}
return rctx;
}
bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
lldb::addr_t &pc) {
// 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];
return true;
}
return false;
}
uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); }
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