SBThread.h

Go to the documentation of this file.

//===-- SBThread.h ----------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef LLDB_SBThread_h_
#define LLDB_SBThread_h_

#include "lldb/API/SBDefines.h"

#include <stdio.h>

namespace lldb {

class SBFrame;

class SBThread
{
public:
    enum
    {
        eBroadcastBitStackChanged           = (1 << 0),
        eBroadcastBitThreadSuspended        = (1 << 1),
        eBroadcastBitThreadResumed          = (1 << 2),
        eBroadcastBitSelectedFrameChanged   = (1 << 3),
        eBroadcastBitThreadSelected         = (1 << 4)
    };

    static const char *
    GetBroadcasterClassName ();
    
    SBThread ();

    SBThread (const lldb::SBThread &thread);
    
    SBThread (const lldb::ThreadSP& lldb_object_sp);

   ~SBThread();

    bool
    IsValid() const;

    void
    Clear ();

    lldb::StopReason
    GetStopReason();

    /// Get the number of words associated with the stop reason.
    /// See also GetStopReasonDataAtIndex().
    size_t
    GetStopReasonDataCount();

    //--------------------------------------------------------------------------
    /// Get information associated with a stop reason.
    ///
    /// Breakpoint stop reasons will have data that consists of pairs of 
    /// breakpoint IDs followed by the breakpoint location IDs (they always come
    /// in pairs).
    ///
    /// Stop Reason              Count Data Type
    /// ======================== ===== =========================================
    /// eStopReasonNone          0
    /// eStopReasonTrace         0
    /// eStopReasonBreakpoint    N     duple: {breakpoint id, location id}
    /// eStopReasonWatchpoint    1     watchpoint id
    /// eStopReasonSignal        1     unix signal number
    /// eStopReasonException     N     exception data
    /// eStopReasonExec          0
    /// eStopReasonPlanComplete  0
    //--------------------------------------------------------------------------
    uint64_t
    GetStopReasonDataAtIndex(uint32_t idx);

    size_t
    GetStopDescription (char *dst, size_t dst_len);
    
    SBValue
    GetStopReturnValue ();

    lldb::tid_t
    GetThreadID () const;

    uint32_t
    GetIndexID () const;

    const char *
    GetName () const;

    const char *
    GetQueueName() const;

    void
    StepOver (lldb::RunMode stop_other_threads = lldb::eOnlyDuringStepping);

    void
    StepInto (lldb::RunMode stop_other_threads = lldb::eOnlyDuringStepping);

    void
    StepInto (const char *target_name, lldb::RunMode stop_other_threads = lldb::eOnlyDuringStepping);
    
    void
    StepOut ();

    void
    StepOutOfFrame (lldb::SBFrame &frame);

    void
    StepInstruction(bool step_over);

    SBError
    StepOverUntil (lldb::SBFrame &frame, 
                   lldb::SBFileSpec &file_spec, 
                   uint32_t line);

    void
    RunToAddress (lldb::addr_t addr);
    
    SBError
    ReturnFromFrame (SBFrame &frame, SBValue &return_value);

    //--------------------------------------------------------------------------
    /// LLDB currently supports process centric debugging which means when any
    /// thread in a process stops, all other threads are stopped. The Suspend()
    /// call here tells our process to suspend a thread and not let it run when
    /// the other threads in a process are allowed to run. So when 
    /// SBProcess::Continue() is called, any threads that aren't suspended will
    /// be allowed to run. If any of the SBThread functions for stepping are 
    /// called (StepOver, StepInto, StepOut, StepInstruction, RunToAddres), the
    /// thread will not be allowed to run and these funtions will simply return.
    ///
    /// Eventually we plan to add support for thread centric debugging where
    /// each thread is controlled individually and each thread would broadcast
    /// its state, but we haven't implemented this yet.
    /// 
    /// Likewise the SBThread::Resume() call will again allow the thread to run
    /// when the process is continued.
    ///
    /// Suspend() and Resume() functions are not currently reference counted, if
    /// anyone has the need for them to be reference counted, please let us
    /// know.
    //--------------------------------------------------------------------------
    bool
    Suspend();
    
    bool
    Resume ();
    
    bool
    IsSuspended();

    bool
    IsStopped();

    uint32_t
    GetNumFrames ();

    lldb::SBFrame
    GetFrameAtIndex (uint32_t idx);

    lldb::SBFrame
    GetSelectedFrame ();

    lldb::SBFrame
    SetSelectedFrame (uint32_t frame_idx);
    
    static bool
    EventIsThreadEvent (const SBEvent &event);
    
    static SBFrame
    GetStackFrameFromEvent (const SBEvent &event);
    
    static SBThread
    GetThreadFromEvent (const SBEvent &event);

    lldb::SBProcess
    GetProcess ();

    const lldb::SBThread &
    operator = (const lldb::SBThread &rhs);

    bool
    operator == (const lldb::SBThread &rhs) const;

    bool
    operator != (const lldb::SBThread &rhs) const;

    bool
    GetDescription (lldb::SBStream &description) const;
    
    bool
    GetStatus (lldb::SBStream &status) const;

protected:
    friend class SBBreakpoint;
    friend class SBBreakpointLocation;
    friend class SBFrame;
    friend class SBProcess;
    friend class SBDebugger;
    friend class SBValue;

    void
    SetThread (const lldb::ThreadSP& lldb_object_sp);

#ifndef SWIG
    SBError
    ResumeNewPlan (lldb_private::ExecutionContext &exe_ctx, lldb_private::ThreadPlan *new_plan);
#endif

private:
    lldb::ExecutionContextRefSP m_opaque_sp;
};

} // namespace lldb

#endif  // LLDB_SBThread_h_