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| //===-- Unwind.h ------------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_Unwind_h_
#define liblldb_Unwind_h_
#include <mutex>
#include "lldb/lldb-private.h"
namespace lldb_private {
class Unwind {
protected:
// Classes that inherit from Unwind can see and modify these
Unwind(Thread &thread) : m_thread(thread), m_unwind_mutex() {}
public:
virtual ~Unwind() {}
void Clear() {
std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
DoClear();
}
uint32_t GetFrameCount() {
std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
return DoGetFrameCount();
}
uint32_t GetFramesUpTo(uint32_t end_idx) {
lldb::addr_t cfa;
lldb::addr_t pc;
uint32_t idx;
bool behaves_like_zeroth_frame = (end_idx == 0);
for (idx = 0; idx < end_idx; idx++) {
if (!DoGetFrameInfoAtIndex(idx, cfa, pc, behaves_like_zeroth_frame)) {
break;
}
}
return idx;
}
bool GetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
lldb::addr_t &pc, bool &behaves_like_zeroth_frame) {
std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
return DoGetFrameInfoAtIndex(frame_idx, cfa, pc, behaves_like_zeroth_frame);
}
lldb::RegisterContextSP CreateRegisterContextForFrame(StackFrame *frame) {
std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
return DoCreateRegisterContextForFrame(frame);
}
Thread &GetThread() { return m_thread; }
protected:
// Classes that inherit from Unwind can see and modify these
virtual void DoClear() = 0;
virtual uint32_t DoGetFrameCount() = 0;
virtual bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
lldb::addr_t &pc,
bool &behaves_like_zeroth_frame) = 0;
virtual lldb::RegisterContextSP
DoCreateRegisterContextForFrame(StackFrame *frame) = 0;
Thread &m_thread;
std::recursive_mutex m_unwind_mutex;
private:
DISALLOW_COPY_AND_ASSIGN(Unwind);
};
} // namespace lldb_private
#endif // liblldb_Unwind_h_
|