ThreadPlanStepOut.h

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//===-- ThreadPlanStepOut.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 LLDB_TARGET_THREADPLANSTEPOUT_H
#define LLDB_TARGET_THREADPLANSTEPOUT_H
 
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/ThreadPlanShouldStopHere.h"
 
namespace lldb_private {
 
class ThreadPlanStepOut : public ThreadPlan, public ThreadPlanShouldStopHere {
public:
  /// Creates a thread plan to step out from frame_idx, skipping parent frames
  /// if they are artificial or hidden frames. Also skips frames without debug
  /// info based on step_out_avoids_code_without_debug_info.
  ThreadPlanStepOut(Thread &thread, SymbolContext *addr_context,
                    bool first_insn, bool stop_others, Vote report_stop_vote,
                    Vote report_run_vote, uint32_t frame_idx,
                    LazyBool step_out_avoids_code_without_debug_info,
                    bool continue_to_next_branch = false,
                    bool gather_return_value = true);
 
  /// Creates a thread plan to step out from frame_idx to frame_idx + 1.
  ThreadPlanStepOut(Thread &thread, bool stop_others, Vote report_stop_vote,
                    Vote report_run_vote, uint32_t frame_idx,
                    bool continue_to_next_branch = false,
                    bool gather_return_value = true);
 
  ~ThreadPlanStepOut() override;
 
  void GetDescription(Stream *s, lldb::DescriptionLevel level) override;
  bool ValidatePlan(Stream *error) override;
  bool ShouldStop(Event *event_ptr) override;
  bool StopOthers() override;
  void SetStopOthers(bool new_value) override { m_stop_others = new_value; }
  lldb::StateType GetPlanRunState() override;
  bool WillStop() override;
  bool MischiefManaged() override;
  void DidPush() override;
  bool IsPlanStale() override;
 
  lldb::ValueObjectSP GetReturnValueObject() override {
    return m_return_valobj_sp;
  }
 
protected:
  void SetFlagsToDefault() override {
    GetFlags().Set(ThreadPlanStepOut::s_default_flag_values);
  }
 
  bool DoPlanExplainsStop(Event *event_ptr) override;
  bool DoWillResume(lldb::StateType resume_state, bool current_plan) override;
  bool QueueInlinedStepPlan(bool queue_now);
 
private:
  static uint32_t s_default_flag_values; // These are the default flag values
                                         // for the ThreadPlanStepThrough.
 
  lldb::addr_t m_step_from_insn;
  StackID m_step_out_to_id;
  StackID m_immediate_step_from_id;
  lldb::break_id_t m_return_bp_id;
  lldb::addr_t m_return_addr;
  bool m_stop_others;
  lldb::ThreadPlanSP m_step_out_to_inline_plan_sp; // This plan implements step
                                                   // out to the real function
                                                   // containing
  // an inlined frame so we can then step out of that.
  lldb::ThreadPlanSP m_step_through_inline_plan_sp; // This plan then steps past
                                                    // the inlined frame(s).
  lldb::ThreadPlanSP m_step_out_further_plan_sp; // This plan keeps stepping out
                                                 // if ShouldStopHere told us
                                                 // to.
  Function *m_immediate_step_from_function;
  std::vector<lldb::StackFrameSP> m_stepped_past_frames;
  lldb::ValueObjectSP m_return_valobj_sp;
  bool m_calculate_return_value;
  StreamString m_constructor_errors;
 
  friend lldb::ThreadPlanSP Thread::QueueThreadPlanForStepOut(
      bool abort_other_plans, SymbolContext *addr_context, bool first_insn,
      bool stop_others, Vote report_stop_vote, Vote report_run_vote,
      uint32_t frame_idx, Status &status,
      LazyBool step_out_avoids_code_without_debug_info);
 
  void SetupAvoidNoDebug(LazyBool step_out_avoids_code_without_debug_info);
 
  void SetupReturnAddress(lldb::StackFrameSP return_frame_sp,
                          lldb::StackFrameSP immediate_return_from_sp,
                          uint32_t frame_idx, bool continue_to_next_branch);
  // Need an appropriate marker for the current stack so we can tell step out
  // from step in.
 
  void CalculateReturnValue();
 
  ThreadPlanStepOut(const ThreadPlanStepOut &) = delete;
  const ThreadPlanStepOut &operator=(const ThreadPlanStepOut &) = delete;
};
 
} // namespace lldb_private
 
#endif // LLDB_TARGET_THREADPLANSTEPOUT_H