ThreadPlanStepRange.h

Go to the documentation of this file.

//===-- ThreadPlanStepRange.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_THREADPLANSTEPRANGE_H
#define LLDB_TARGET_THREADPLANSTEPRANGE_H
 
#include "lldb/Core/AddressRange.h"
#include "lldb/Target/StackID.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/ThreadPlanShouldStopHere.h"
 
namespace lldb_private {
 
class ThreadPlanStepRange : public ThreadPlan {
public:
  ThreadPlanStepRange(ThreadPlanKind kind, const char *name, Thread &thread,
                      const AddressRange &range,
                      const SymbolContext &addr_context,
                      lldb::RunMode stop_others,
                      bool given_ranges_only = false);
 
  ~ThreadPlanStepRange() override;
 
  void GetDescription(Stream *s, lldb::DescriptionLevel level) override = 0;
  bool ValidatePlan(Stream *error) override;
  bool ShouldStop(Event *event_ptr) override = 0;
  Vote ShouldReportStop(Event *event_ptr) override;
  bool StopOthers() override;
  lldb::StateType GetPlanRunState() override;
  bool WillStop() override;
  bool MischiefManaged() override;
  void DidPush() override;
  bool IsPlanStale() override;
 
  void AddRange(const AddressRange &new_range);
 
protected:
  bool InRange();
  lldb::FrameComparison CompareCurrentFrameToStartFrame();
  bool InSymbol();
  void DumpRanges(Stream *s);
 
  Disassembler *GetDisassembler();
 
  InstructionList *GetInstructionsForAddress(lldb::addr_t addr,
                                             size_t &range_index,
                                             size_t &insn_offset);
 
  // Pushes a plan to proceed through the next section of instructions in the
  // range - usually just a RunToAddress plan to run to the next branch.
  // Returns true if it pushed such a plan.  If there was no available 'quick
  // run' plan, then just single step.
  bool SetNextBranchBreakpoint();
 
  // Whether the input stop info is caused by the next branch breakpoint.
  // Note: this does not check if branch breakpoint site is shared by other
  // breakpoints or not.
  bool IsNextBranchBreakpointStop(lldb::StopInfoSP stop_info_sp);
 
  void ClearNextBranchBreakpoint();
 
  void ClearNextBranchBreakpointExplainedStop();
 
  bool NextRangeBreakpointExplainsStop(lldb::StopInfoSP stop_info_sp);
 
  SymbolContext m_addr_context;
  std::vector<AddressRange> m_address_ranges;
  lldb::RunMode m_stop_others;
  StackID m_stack_id; // Use the stack ID so we can tell step out from step in.
  StackID m_parent_stack_id; // Use the parent stack ID so we can identify tail
                             // calls and the like.
  bool m_no_more_plans;   // Need this one so we can tell if we stepped into a
                          // call,
                          // but can't continue, in which case we are done.
  bool m_first_run_event; // We want to broadcast only one running event, our
                          // first.
  lldb::BreakpointSP m_next_branch_bp_sp;
  bool m_use_fast_step;
  bool m_given_ranges_only;
  bool m_found_calls = false; // When we set the next branch breakpoint for
                              // step over, we now extend them past call insns
                              // that directly return.  But if we do that we
                              // need to run all threads, or we might cause
                              // deadlocks.  This tells us whether we found
                              // any calls in setting the next branch breakpoint.
 
private:
  std::vector<lldb::DisassemblerSP> m_instruction_ranges;
 
  ThreadPlanStepRange(const ThreadPlanStepRange &) = delete;
  const ThreadPlanStepRange &operator=(const ThreadPlanStepRange &) = delete;
};
 
} // namespace lldb_private
 
#endif // LLDB_TARGET_THREADPLANSTEPRANGE_H